Abstract: Disclosed is a method for making a prototype plastic injection molded part from a mold tool (10) built by fused deposition modeling. The mold tool (10) is built by depositing roads of a molten thermoplastic resin in layers in a predetermined pattern defined by computer file data representing the inverse of the desired prototype molded part, and is used in an injection molding machine without the addition of any reinforcement fill material or layers to create the prototype part. The disclosed method provides prototype plastic injection molded parts within a twenty-four hour time period.

Abstract: Materials and methods for freeform fabrication of a solid three-dimensional object are provided. At least one layer of support material and at least one layer of build material are dispensed onto a substrate. The support material includes at least one of water and a fusible water-containing substance and the build material is a substance other than water or a fusible, water-containing substance. After solidification, the at least one layer of support material is removed by an automated or manual process which includes washing with water at ambient temperature and/or causing the support material to undergo a phase change, to produce the solid three-dimensional object.

Abstract: Molded structures, methods of and apparatus for producing the molded structures are provided. At least a portion of the surface features for the molds are formed from multilayer electrochemically fabricated structures (e.g. fabricated by the EFAB™ formation process), and typically contain features having resolutions within the 1 to 100 ?m range. The layered structure is combined with other mold components, as necessary, and a molding material is injected into the mold and hardened. The layered structure is removed (e.g. by etching) along with any other mold components to yield the molded article. In some embodiments portions of the layered structure remain in the molded article and in other embodiments an additional molding material is added after a partial or complete removal of the layered structure.

Abstract: A method for molding composite structures whereby a material stack including a core having first and second opposing sides is prepared. The preparing of the material stack includes applying a fibrous support layer on at least one of the first side and the second side of the core section, applying an adhesive layer on the support layer, and applying a thermoplastic barrier layer on the adhesive layer. The method also includes preparing a resin and a mold; placing the material stack in the mold; sealing the core; infusing the mold and material stack with resin; curing the structure; and removing the structure from the mold. In one embodiment, the method creates a composite aircraft wing panel.

Abstract: A ceramic matrix composite (CMC) structure, and method of forming same, the structure having internal air flow channels and cooling holes created by the process of sewing or stitching a fugitive fiber or thread into plies of ceramic cloth, preferably prior to consolidation of the ceramic cloth with a CMC slurry, followed by heating to convert the slurry material to a hardened ceramic component part of a predetermined shape. Upon heating the infiltrated and consolidated ceramic cloth to about between 1100 and 2100 degrees Fahrenheit, such as by hot pressing the structure containing the fugitive fibers therein, the fugitive fibers disintegrate, leaving channels and cooling holes wherever the stitched fugitive fiber or thread was previously located. Thus, the channels and cooling holes flow between plies as well as across the surface of the top and bottom plies.

Abstract: A process is described for making gourd molds useful in the production of decorative ceramic and other articles which bear the textures of the gourd interior. Articles produced may also serve as models for use in the manufacture of production molds. Steps in making the gourd molds include selection, cutting, and removal of pulp; steps in using the gourd molds include treating with a release agent, casting, and removal of the gourd mold from the molded article.

Abstract: To form an arc tube body including a main tube portion to be a discharge space and thin tube portions for accommodating electrodes, a core (6) is disposed in a hollow space formed by a pair of arc tube body formation molds (7) and (8) and thereafter, a slurry (12) is injected into a space between the molds (7), (8) and the core (6). In the core (6), portions for forming the internal shape of the thin tube portions of the arc tube body are provided with a shaft (3).

Abstract: A method of manufacturing a polishing pad is described. A mold having a mold cavity therein is provided. At least a strip is buried in the mold. A polymer foam material is injected into the mold cavity of the mold. The polymer foam material is cured to mold the polymer foam material into a molding polymer article. A mold release process is performed to obtain the molding polymer article. The strip on the molding article is removed to form a polishing pad having at least one groove thereon.

Abstract: Process for producing hollow bodies comprising fibre-reinforced ceramic materials, where cores whose shape corresponds to that of the hollow spaces are produced in a first step, a green body is produced in a second step by introducing the abovementioned cores and a press moulding compound into a mould, where the press moulding compound comprises carbon fibres and/or carbon threads and pitch and/or resins, the green body is cured in a third step by heating under pressure, and then carbonised in a fourth step by heating in the absence of oxidants to form a C/C body, which latter can be infiltrated with liquid metal with retention of its shape in a fifth step, with at least partial formation of carbides, where the cores comprise a material which is non-meltable but undergoes at least sufficient shrinkage above the curing temperature of the shaping by pressing of the press moulding compound for the shrunken core to be able to be taken out from the carbonised body; hollow bodies produced by this process and also t

Abstract: An indirect solid free form scaffold manufacturing technique is provided. More particularly, the present invention provides a set of molds, casting methods, mold removals, and surface modification techniques that are compatible with image-based design methods and with solvent, melt, and slurry casting of polymers and ceramics.

Abstract: A method for fabricating scanning probe microscopy (SPM) probes is disclosed. The probes are fabricated by forming a structural layer on a substrate, wherein the substrate forms a cavity. A sacrificial layer is located between the substrate and the structural layer. Upon forming the structural layer, the sacrificial layer is selectively removed, and the probe is then released from the substrate. The substrate may then later be reused to form additional probes. Additionally, a contact printing method using a scanning probe microscopy probe is also disclosed.

Abstract: A process for the production of composite tubing, particularly for air conditioning, from a structure of mineral or organic fibers, natural or artificial. The structure of fibers is impregnated with a suitable resin, and after shaping in or on a mold, the temperature and possibly the pressure is raised for polymerization of the resin, a sealing of the wall of the shaped piece being carried out in the course of this process. The structure of fibers is constituted by a single ply of a unit weight of at least about 400 g/m2, which ply is impregnated with resin at an impregnation quantity of at least 40%, then there is emplaced on one of the surfaces of the single ply a coating of a sealing agent. The polymerization is carried out while the single ply and its coating have the desired shape in or on the mold.

Abstract: A method for manufacturing of water-proof cover for zipper tab includes taking a zipper where holes are provided on the tapes thereof at the position adjacent to one end of the tooth-chains; covering an upper mold provided with a sprue thereon and a lower mold on the holes on the tapes, and inserting a core mold in-between the groove and tooth-chains; injecting plastic from the sprue and detaching the upper and lower molds after the plastic is solidified to a desired shape, such that a decorative cover is formed at one end of the tooth-chains; and mounting a zipper tab from the upside of the tooth-chains, and stapling a stopper to each end of the combined tooth-chains. Accordingly, when the zipper is drawn upwardly, the zipper tab can be positioned inside the decorative cover, such that the connecting portion of the tooth-chains and the zipper tab can be covered by the decorative cover and therefore prevent from being wetted by rain.

Abstract: A method is provided for molding an article (10) that includes a polymer (100) such as an epoxy resin, reinforced by fibrous material (102) such as fiberglass which is embedded in the polymer material, especially for a hollow article such as a shell. The method includes placing spacers (42, 44) in a mold cavity (30), where the spacers conform closely to the cavity surface and leave a free, or empty volume (64) within themselves. Foamable material (60A) is placed in the free volume and allowed to expand and push the spacers toward the cavity walls while forming a foam core (70) within the spacers. The mold is opened and the spacers and foam core are removed. Next, the foam core is covered with an impervious layer and the fibrous material (72) is wrapped around the foam core. The foam core is placed back in the mold, with the fibrous material spacing the foam core from the walls of the mold.

Abstract: A method of forming a device including a plurality of micron or sub-micron sized features is provided. A master having a surface contour defining a plurality of features is provided. The surface contour of the master is coated with at least one layer of material to form a shell. The master is removed from the shell to form a negative image of the surface contour in the shell. The negative image in the shell is filled with material, for example, polycarbonate, polyacrylic, or polystyrene, to form a device having features substantially the same as the master. The negative image may be filled using injection molding, compression molding, embossing or any other compatible technique.

Abstract: A fiber composite structural component such as a fitting, bracket, mounting or the like is produced by applying fiber material such as fiber threads or fiber yarns in an automatic circular weaving operation to a core that has at least two sections, to form a fiber material body (6). One core section is removed from the fiber material body when the weaving is completed. The body is then deformed in a mold that has the contour of the finished structural component with at least one mold core section still in the fiber material body. The deformed configuration of the structural component is then impregnated in an RTM device with a resin and hardener followed by curing. Reinforcements may be inserted or secured to the fiber material body prior to the impregnated and curing step.

Abstract: A stay-in-place method of manufacturing a composite form that is used to provide a strong and durable concrete structure. The form includes a composite shell having an inner wall surface defining an enclosure into which concrete may be poured and allowed to harden. The composite shell may be made of one or several layers of fabric having a resin matrix impregnated therein. The concrete hardens to form a concrete core within the enclosure and a liner is affixed to the inner wall surface of the composite shell to protect the composite shell from alkalinity in the concrete core. The liner includes at least one sheet of a water-impermeable material to protect the concrete core from water and other corrosive elements. The fabric layers are selected such that the fibers elongate as the concrete is poured into the enclosure due to a weight of the concrete and partially shrink back to compensate for shrinkage of the concrete as the concrete dries to form the concrete core.

Abstract: The present invention is a modeling technique wherein a three-dimensional model and its support structure are built by fused deposition modeling, using a thermoplastic blended material containing a polyphenylsulfone (PPSF) polymer and a polycarbonate (PC) polymer to form the model. The PPSF/PC blend exhibits good chemical resistance, thermal stability, and resists build-up in the nozzle of a three-dimensional modeling apparatus. Removal of the support structure from a completed model is facilitated by operating on the material while it is hot.

Abstract: Disclosed is both a method and apparatus for mechanically embossing a surface covering. The apparatus includes an embossing tool comprising a slurry. The slurry includes both a filler and binder. The method includes printing a slurry onto a surface covering and compressing the slurry onto the surface covering to create a mechanically embossed texture onto the surface covering.

Abstract: A method of manufacturing a honeycomb structure, the method comprising the steps of forming staggered cells through the entire thickness of a fiber fabric, causing loosely held pegs to penetrate into respective ones of the cells, each peg having a cross-section of size smaller than that of the corresponding cell and being made of a material that is suitable for expanding; expanding the pegs so that they fill the cells and exert pressure on the inside faces of the cells; and shrinking the pegs and then withdrawing them.

Abstract: A method for manufacture of a hollow complex three-dimensional fiber golf club head having at least one hole. A fluid-removable core is shaped in the general form of the golf club head, placed in a flexible pressurizable bladder around the core, at least one ply of fiber impregnated with a curable resin is wrapped over the core and bladder, and a cured part is formed by pressurizing the bladder while the core, bladder, and impregnated fiber is in a female mold to force the plies against the inner surfaces of the mold. After heating to cure the resin, the bladder and the fluid-removable core is removed from the interior of the cured part by disintegrating core with a fluid sufficient to allow removal of the bladder.

Abstract: A method for fabricating scanning probe microscopy (SPM) probes is disclosed. The probes are fabricated by forming a structural layer on a substrate, wherein the substrate forms a cavity. A sacrificial layer is located between the substrate and the structural layer. Upon forming the structural layer, the sacrificial layer is selectively removed, and the probe is then released from the substrate. The substrate may then later be reused to form additional probes. Additionally, a contact printing method using a scanning probe microscopy probe is also disclosed.

Abstract: There are provided methods for fabricating baby bottle nipples which mimic the function of the human breast nipple. In the human breast nipple, milk is delivered to the baby through 15-25 fluid-delivery capillaries called lactiferous ducts. These ducts are 2-4 centimeters in length and 500-900 microns in diameter. Baby bottle nipples fabricated in accordance with the methods of this invention have the common feature of at least one hydrophilic fluid delivery passage. In one embodiment, the fluid delivery passage is a microtube. In another embodiment, the fluid delivery passage is a microchannel. In yet another embodiment, the fluid delivery passage comprises a porous reticulated foam with interconnected pores. In each of these embodiments, the fluid delivery passage has at least one dimension in the range of 1-2000 microns.

Abstract: Disclosed is a modeling technique wherein a three-dimensional model and its support structure are built by fused deposition modeling, using a thermoplastic blended material containing a polyphenylsulfone (PPSF) polymer and a polycarbonate (PC) polymer to form the model. The PPSF/PC blend exhibits good chemical resistance, thermal stability, and resists build-up in the nozzle of a three-dimensional modeling apparatus. Removal of the support structure from a completed model is facilitated by operating on the material while it is hot.

Abstract: The invention relates to a method for production of three-dimensionally arranged conducting and connecting structures for volumetric and energy flows. Various light-setting materials are used for the production of the layers. Upon exchanging the materials, those layer regions in which no setting occurred during the preceding setting process, are also filled with new material, such that, in the subsequent setting process, not only is the upper layer linked to the one lying directly beneath it, but also material of the upper layer is connected to the material of a layer lying below the penultimate layer. It is thus possible, within the layer sequence, to connect a structure with varying properties from layer to layer.

Abstract: A method is provided for the fabrication of a protective coating for a crucible with channels being formed in the coating. A material is adhered to the outer wall of the crucible to form a pattern thereon. The outer wall of the crucible along with the pattern of material adhered thereto is next coated with another material. The material used to form the pattern should extend through the outer material coating to define at least one port therein. Next, the crucible with its pattern of material and outer coating material is heated to a temperature of transformation at which the pattern of material is transformed to a fluidic state while the crucible and outer coating material maintain their solid integrity. Such transformation could also be accomplished by using a solvent that causes the pattern of material to dissolve.

Abstract: A composite sports racquet frame is made by placing a first prepreg tube into a first mold plate and a second prepreg tube into a second mold plate. A plurality of pin plates, each having a plurality of pins which are at least substantially parallel to one another, are secured to the mold plate so that, when the mold is closed, the pins extend between the two tubes. The tubes are pressurized to assume the shape of the mold and contact one another, and the mold is heated to allow resin to flow between the tubes as they cure, the pins forming pin holes in the frame. Once cured, the frame is removed from the mold, and the pins are withdrawn. If desired, the ends of the tubes forming the handle section can be kept separate from one another during the molding process, by using a removable mold plate. In this manner, not only do the two tubes become integral with one another, at least in the head portion, but string holes do not need to be drilled after the racquet is molded.

Abstract: A thin walled microtube is formed by providing a continuous elongated member having an outer surface. The member is at least partially formed of a water soluble material. A coating material is provided. The coating material may be a silicone compound that is curable such that the coating material cures into a substantial non-porous silicone. The outer surface of the elongated member is coated with a coating material so as to form a substantially uniform and continuous layer of coating material on the outer surface. The layer of coating material is cured so as to form a substantial uniform and continuous layer of substantially non-porous silicone on the outer surface. The elongated member is at least partially dissolved using water and purged from the silicone layer, such that an elongated tube of substantially non-porous silicone is formed.

Abstract: A process for three-dimensional modeling in which an alkali-soluble thermoplastic material is used in an additive deposition process to form a soluble support structure (28) for a three-dimensional object (26) under construction. The alkali-soluble thermoplastic material includes a base polymer of carboxylic acid and a plasticizer. Following formation, the object (26) is placed in an alkaline bath to dissolve the support structure (28). The alkali-soluble material can be used to form an alkali-soluble three-dimensional object (26).

Abstract: A beaded preform includes a plurality of adjacently positioned beads for forming a plurality of voids in an engineered material. The beaded preforms may be comprised of a filaments (single strand of beads) and mats (two-dimensional and three dimensional arrays of beads). The filaments and mats may be coated to become tows and laminates, respectively, which may then be assembled into composite materials. The preforms may be produced using novel manufacturing apparatuses and methods, and incorporated into known manufacturing processes to produce porous structures, including stress-steering structures, in any material including metals, plastics, ceramics, textiles, papers, and biological materials, for example.

Abstract: A resin (61) as a material of a resin mold is injected in a second resin filling space (57) from a resin injection hole (51) provided in a second back surface reinforcing member (50). When the resin overflows from a resin overflow hole (52), the injection of the resin is stopped, followed by curing of the resin. During the operation of the resin filling step, since a downward load equivalent to a total of a weight of the resin injected in the second resin filling space and the injection pressure is applied to the master model (30), there is a possibility that the master model be deflected downwardly; however, in actual, since the back surface of the master model is overall supported by the temporary filler (59), the master model is not deflected downwardly.

Abstract: A method for producing a bicycle wheel rim having an inner peripheral wall, an outer peripheral wall, two lateral walls joining said peripheral walls, and two circumferential wings, for anchoring a tire, is provided. The method providing a rim made of a single part made of structural fiber based material, preferably carbon fiber material.

Abstract: The invention concerns a method for controlling coalescence of particles forming a structure subjected to a treatment designed to establish crosslinking between said particles. The method consists in recording at least a physical quantity, whereof the evolution is continuously measurable and whereto the particle crosslinking is correlated, and in stopping the treatment when said physical quantity reaches a value corresponding the desired coalescence. The invention is characterized in that it consists in measuring as said physical quantity the shrinking of said structure. The invention also concerns a method and a device for making a structure of mutually crosslinked particles using said control method and a method for obtaining a product with interconnected pores, in particular for bone substitution, using such a structure.

Abstract: A process for the production of a panel (7) of composite material with stiffening strips (3), in which a mold (1) is draped with at least one first ply (2) of fibers pre-impregnated with resin, there is emplaced at desired positions on said ply (2) at least one stiffening strip (3), the stiffening strip (3) as well as at least a portion of the remaining surface of the first ply (2) is covered with at least one second ply (4) of fibers pre-impregnated with resin, then a bladder (6) is placed to cover the above elements, the assembly is then placed under vacuum and then in an autoclave to polymerize the resin. Before emplacement of the stiffening strip (3) and/or of the second ply (4), there is interposed at least one layer (5) of a non-adherent material between at least one portion of the surface of the stiffening strip (3) and one and/or the other of the plies (2, 4).

Abstract: The present invention relates to a method for producing a part (108, 200, 300), comprising the following steps:

Abstract: A method of manufacturing hollow ceramics fibers with the pores of the micron-scale hollow structure unidirectionally oriented, the method of manufacturing is characterized in the steps of dispersing organic fibers in a dielectric liquid and applying high voltage to the dielectric liquid containing the dispersed organic fibers to electrostatically align them to produce a fiber accumulation in which the organic fibers are unidirectionally oriented, using the fiber accumulation as a mold and dipping the fiber accumulation in a ceramics base solution, and then removing the mold by treatment with heat or organic solvents.

Abstract: The present invention is a method for making a composite structure that includes three resin impregnated structural cloth layers including a bottom sheet, a top sheet and a core sheet. The core sheet is a continuously curved shape with flat valleys that are bonded to the bottom sheet and flat peaks that are bonded to the top sheet. In the invention process, a dry core sheet is sandwiched between two wax core molds that form the core sheet. The core molds and the core sheet are sandwiched between dry top and bottom sheets by rigid molds as the flat peaks and valleys of the core sheet make contact with the top and bottom sheets through openings in the core molds. Liquid resin is transferred into the dry sheets and then cured. The lay up is disassembled and the wax core molds are melted and drained from the finished, rigid structure.

Abstract: An orthopedic implant device and method is disclosed. Specifically, a knee mold system is disclosed, including elastic tibial and femoral molds, each of which may be configured and dimensioned as a unitary mold for in situ placement during a surgical procedure. Each mold may be manufactured from an elastic material that may be disposable. The tibial mold may further comprise a sidewall forming a cavity, markings for relative depth measurement, and depth rings for use as a guide for scoring, cutting, and/or trimming and tearing away an excess portion of the tibial mold. The femoral mold may further comprise a sidewall defining a cavity, two legs extending from a body of the femoral mold for forming the artificial condyles, and an eyelet for aiding in placement and removal of the femoral mold. The resulting prosthetic tibial and femoral components may form an articulation surface that mimics, at least in part, the natural articulation surface of the knee.

Abstract: There is presented a method of connecting a plurality of mandrels to one another to constitute an integral mandrel 10, forming a fabric 1 on the surface of the integral mandrel, and infiltrating the formed fabric with matrix. A plurality of products can simultaneously be manufactured, and this can remarkably reduce fiber loss and enhance productivity.

Abstract: 3-D biodegradable porous, polymer (natural or synthetic) scaffolds with well-controlled, interconnected pores, and method for forming the porous materials. Hydrophilic and/or hydrophobic porogen materials were fabricated into 3-D negative replicas of the desired macroporous architectures. Biodegradable polymers (PLLA and PLGA) were dissolved in a solvent and cast onto the negative replica. After dissolving/leaching out the porogen materials, a porous polymer scaffold was formed. The skeletal structure of PLLA foams consisted of small platelets or nano-fibers, while PLGA foams had homogeneous skeletal structure. To improve the cell seeding, distribution, mass transport, and new tissue organization and vascularization, 3-D macroporous architectures are built in the nano-fibrous matrices. The method tailors polymer scaffolds for a variety of potential tissue engineering applications due to the well-controlled architecture, inter-pore connectivity, and mechanical properties.

Abstract: Methods of manufacturing cellulosic structures, e.g., for use in expandable-collapsible electrode assemblies for diagnostic and/or therepeutic electrophysiology devices, are disclosed. One such preferred method includes providing a mandrel having a head portion and a neck portion, the head portion having an outer circumference greater than the neck portion, dipping the mandrel into a cellulosic substance, curing the cellulosic substance, and separating the mandrel from the cured cellulosic substance.

Abstract: Method of manufacturing a ribbed structure with fiber-reinforced composite material is provided. A mold for the structure is prepared having a mold surface. Non-hardened resin containing reinforcing fibers are placed on the mold surface of the structure mold. A mold for a rib is formed by using a material containing biodegradable polymers. Non-hardened resin containing reinforcing fibers are laminated on the rib mold, and then the rib mold is placed in a predetermined position on the non-hardened resin containing the reinforcing fibers tin the mold surface of the structure mold. The non-hardened resins are hardened and the rib mold is biochemically degraded wherein in the hardening of the resins, the resin hardened on the rib mold and the resin hardened on the mold surface of the structure mold are united with each other.

Abstract: A thin walled microtube is formed by providing a continuous elongated member having an outer surface. The member is at least partially formed of a water soluble material. A coating material is provided. The coating material may be a silicone compound that is curable such that the coating material cures into a substantial non-porous silicone. The outer surface of the elongated member is coated with a coating material so as to form a substantially uniform and continuous layer of coating material on the outer surface. The layer of coating material is cured so as to form a substantial uniform and continuous layer of substantially non-porous silicone on the outer surface. The elongated member is at least partially dissolved using water and purged from the silicone layer, such that an elongated tube of substantially non-porous silicone is formed.

Abstract: A method of producing a molded article includes the steps of positioning an insert within a first mold, and filling the first mold with a low melt allow to form a lost core assembly. The lost core assembly includes an external shape corresponding to the desired cavity formed within the molded article. The inserts are supported within the lost core and form a part of the surface of the cavity of the completed molded article. The lost core assembly is over-molded with a thermoplastic or thermoset material. The alloy material is removed leaving the inserts within the molded article to form specific portions of the cavity.

Abstract: Channeled articles having very small diameter channels spaced very closely can be made by packing elongated cores in a fixture, clamping them, and then introducing matrix material around the cores. The matrix material is formed into a unitary body and solidified. The cores are pulled out, leaving open channels where they had been. Some core and matrix combinations will permit the cores to be pulled out. Others require a core release coating to be applied to the cores. The cores can be metal or ceramic or polymer, and the matrix can be metal or ceramic or polymer. The cores can be solid, or hollow. Rather than pulling the cores out, if they are polymer, they can be burned out. The matrix can be formed by liquid state, solid state, or hybrid liquid/solid state techniques. A related technique uses hollow cores, which are not pulled out, but which remain in the body after unification. For such tube-walled articles, the matrix can be formed similarly. Rather than insuring core release, core retention is required.

Abstract: A manufacturing method comprising the steps of forming at first solidified wax layer of a desired shape, depositing onto the first solidified wax layer at least one layer of a liquid resin formulation, solidifying the layer of liquid resin formulation, depositing a second wax layer on to the combination of the first solidified wax layer and the layer of solidified resin formulation, solidifying the second wax layer, and separating the solidified resin formulation from first and second wax layers. Preferably, the resin formulation comprises at least one monofunctional water soluble vinyl or acrylic monomer in combination with a low molecular weight aliphatic polymer having acrylic or methacrylic acid functionality. The solidified wax and resin formulation layers can be machined as may be desired to form mold of a given shape comprising wax layers when the layer of formulation is separated from the wax layers.

Abstract: A thermoplastic conformal tool/vacuum bag that is structured to substantially conform to a surface or a cavity in a composite structure is placed proximate to a uncured composite member to fabricate a composite structure. External heat and external pressure are applied to cure the member. The conformal thermoplastic tool/vacuum bag is removed from the cured assembly by reheating, if necessary, to facilitate removal of the tool/vacuum bag.

Abstract: Process for producing hollow bodies comprising fibre-reinforced ceramic materials, where cores whose shape corresponds to that of the hollow spaces are produced in a first step, a green body is produced in a second step by introducing the abovementioned cores and a press moulding compound into a mould, where the press moulding compound comprises carbon fibres and/or carbon threads and pitch and/or resins, the green body is cured in a third step by heating under pressure, the cured green body is carbonised in a fourth step by heating in the absence of oxidants to form a C/C body, and, if desired, the C/C body is infiltrated with liquid metal with retention of its shape in a fifth step, with at least partial formation of carbides occurring, where the cores comprise a material which in the fourth step melts without decomposition at a temperature above the curing temperature of the shaping by pressing of the press moulding compound; hollow bodies produced by this process and also their use as brake disks, clutch

Abstract: To form an arc tube body including a main tube portion to be a discharge space and thin tube portions for accommodating electrodes, a core (6) is disposed in a hollow space formed by a pair of arc tube body formation molds (7) and (8) and thereafter, a slurry (12) is injected into a space between the molds (7), (8) and the core (6). In the core (6), portions for forming the internal shape of the thin tube portions of the arc tube body are provided with a shaft (3).

Abstract: A method for producing formed semiconductor articles with predefined shapes such as core tubes for CVD production of bulk polysilicon. The method is characterized by thermal spray deposition of the semiconductor material in a on a temperature controlled rotating mandrel that is shaped complementarily to the desired article shape, and by later separation of the formed semiconductor body from the mandrel by thermal contraction, melting, or chemical reduction of the mandrel size.