Abstract: A recrystallized silicon carbide body is provided that has a resistivity of not less than about 1E5 ? cm and a nitrogen content comprising nitrogen atoms bonded within the body, wherein the nitrogen content is not greater than about 200 ppm.

Abstract: A ceramics sliding member for use in ultrapure water or pure water of the present invention is made of an SiC sintered body. The SiC sintered body includes ?-SiC at a ratio of 20% or more thereto and has an average crystal structure whose aspect ratio is 2 or greater.

Abstract: A dense silicon carbide (SiC) material with boron (B), nitrogen (N) and oxygen (O) as the only additives and with excellent insulting performance (electrical volume resistivity greater than 1×108 ?.cm). The SiC ceramic material, made from a powder mix of, by weight, from 0.1 to 7% boron carbide, from 0.1 to 7% silicon nitride, from 0.1 to 6% silicon dioxide, and a balance of ?-SiC, consists essentially of (1) at least 90% by weight of ?-SiC, (2) about 0.3 to 4.0% by weight of boron, (3) about 0.1 to 6.0% by weight of nitrogen, (4) about 0.06 to 0.5% by weight of oxygen, and (5) no more than 0.07% by weight of metallic impurities; wherein the boron and nitrogen are present according to an B/N atomic ratio of 0.9:1 to 5:1. In particular, this material is suitable for applications in plasma etching chambers for semiconductor and integrated circuit manufacturing.

Abstract: A precursor formulation of a silicon carbide material that includes a ceramic material and a boron-11 compound. The ceramic material may include silicon and carbon and, optionally, oxygen, nitrogen, titanium, zirconium, aluminum, or mixtures thereof. The boron-11 compound may be a boron-11 isotope of boron oxide, boron hydride, boron hydroxide, boron carbide, boron nitride, boron trichloride, boron trifluoride, boron metal, or mixtures thereof. A material for use in a nuclear reactor component is also disclosed, as are such components, as well as a method of producing the material.

Abstract: It is to provide a ceramic sintered body and a ceramic filter having a long-term stability which can prevent cracks from occurring due to the breakage of ceramic particles when thermal stress is applied in regeneration process and the like, and can prevent catalyst carried from deteriorating when regeneration treatment is conducted repeatedly. The invention is a ceramic sintered body comprising ceramic coarse particles and porous bonding layers existing between the ceramic coarse particles to connect the particles and comprising ceramic fine particles having an average particle size smaller than that of the ceramic coarse particles and/or the aggregates thereof, and a ceramic filter prepared by using the ceramic sintered body.

Abstract: A batch mixture including ceramic-forming ingredients, a pore former, a binder comprising an ammonium salt of an alkylated cellulose binder, and a liquid vehicle, as defined herein. Also disclosed is a method for producing a ceramic precursor article as defined herein having excellent extrusion properties.

Abstract: Inorganic fibers consisting substantially of silicon, carbon, oxygen and a transition metal, having a fiber size of no greater than 2 ?m and having fiber lengths of 100 ?m or greater.

Abstract: A precursor formulation of a silicon carbide material that includes a ceramic material and a boron-11 compound. The ceramic material may include silicon and carbon and, optionally, oxygen, nitrogen, titanium, zirconium, aluminum, or mixtures thereof. The boron-11 compound may be a boron-11 isotope of boron oxide, boron hydride, boron hydroxide, boron carbide, boron nitride, boron trichloride, boron trifluoride, boron metal, or mixtures thereof. A material for use in a nuclear reactor component is also disclosed, as are such components, as well as a method of producing the material.

Abstract: The present invention relates to a method for production of a porous ceramic body and a corresponding porous ceramic body which can find application, in particular, as filter, or filter membrane in cross-flow filtration. According to the method of the invention, a bimodal ceramic powder mixture is moulded to give a moulded body, which is subsequently recrystallised by conditioning at high temperature, such that the fine particles melt and link the large particles firmly together by deposition thereon, such that, in defined regions (2,3), a porous ceramic body with a homogeneous structure of almost uniform particle size and pore size is formed, whereby the pores provide an interconnected, open, three-dimensional network.

Abstract: A refractory composition having excellent erosion resistance and infiltration resistance to a molten metal and a formed article and a sintered article produced from the refractory composition are provided. The refractory composition comprises for 100 parts by mass of at least one compound selected from the group consisting of silicon nitride, boron nitride, and silicon carbide, 5 to 40 parts by mass of at least one compound selected from the group consisting of calcium fluoride, magnesium fluoride, calcium oxide or its precursor, magnesium oxide or its precursor, barium oxide or its precursor, and barium sulfate. The content of the silicon nitride, boron nitride, and silicon carbide in the composition is 20 mass % or more.

Abstract: The invention relates to a process for obtaining a structure made from a porous ceramic material comprising at least 95% of silicon carbide SiC, said process being characterized in that said structure is obtained from a mixture of SiC grains comprising at least: a first fraction of ?-SiC grains whose median diameter is less than 5 microns; a second fraction of ?-SiC grains whose median diameter is at least two times greater than that of the first fraction of ?-SiC grains and whose median diameter is greater than or equal to 5 microns; and a fraction of ?-SiC grains or of at least a precursor of ?-SiC grains. The invention also relates to the porous structure obtained according to the process.

Abstract: A heating apparatus comprising an energetic nanolaminate film that produces heat when initiated, a power source that provides an electric current, and a control that initiates the energetic nanolaminate film by directing the electric current to the energetic nanolaminate film and joule heating the energetic nanolaminate film to an initiation temperature. Also a method of heating comprising providing an energetic nanolaminate film that produces heat when initiated, and initiating the energetic nanolaminate film by directing an electric current to the energetic nanolaminate film and joule heating the energetic nanolaminate film to an initiation temperature.

Abstract: A novel process for the preparation of boron carbide, boron nitride and silicon carbide powders comprises carbidization or nitrization step of boron oxide or silicon oxide respectively, using nanoparticles substrates.

Abstract: An SiC fiber bonded ceramic constituted of both a base material which comprises both inorganic fibers made mainly of a sintered SiC structure containing 0.01 to 1 wt % of oxygen (O) and at least one of Groups 2A, 3A and 3B metals and a 1 to 100-nm and carbon (C)-base boundary layer formed among the fibers and a surface part which is made mainly of an SiC-base ceramic structure and formed on at least part of the surface of the base material, characterized in that the boundary portion between the surface part and the base material takes such a gradient structure that the structure of the base material changes into the structure of the surface part gradually and continuously.

Abstract: A method for preparing ordered mesoporous silicon carbide (OMSiC) nanocomposites uses an evaporation-induced self-assembly of a precursor composition that preferably includes a phenolic resin, pre-hydrolyzed tetraethyl orthosilicate, a surfactant, and butanol. The precursor mixture is dried, cross-linked and heated to form ordered mesoporous silicon carbide material having discrete domains of ordered, mesoscale pores.

Abstract: This chemical vapor synthesis process was designed so that a metal carbide precursor and a secondary metal precursor are separately or together fed into each evaporator in a reactor by specially designed precursor feeders, either simultaneously or sequentially. The reduction and carburization of the vaporized precursors by gaseous mixtures produces carbide-metal nanocomposite powders. The product can be a very uniform mixture of the constituent powders or a uniform agglomerate, which is important to ensure a high quality of bulk cemented metal carbide product after consolidation and sintering. These nanocomposite powders can be readily characterized using XRD, carbon analyzer and TEM.

Abstract: A composition for ceramic extrusion-molded bodies includes a ceramic material, a water-soluble cellulose ether, a styrenesulfonate and water. A method for manufacturing a ceramic extrusion-molded body using the composition is also provided.

Abstract: Preparation for producing refractory materials, characterized in that it comprises one or more particulate, refractory components and one or more binders, where—the particulate, refractory component has a mean particle diameter of >0.3 m and—the binder is selected from among—from 0.05 to 50% by weight of a very finely particulate binder having a mean particle diameter of from 10 nm to 0.3 m selected from the group consisting of aluminium oxide, titanium dioxide, zirconium dioxide and/or mixed oxides of the abovementioned oxides, —from 0 to 20% by weight of an inorganic binder, from 0 to 20% by weight of a hydraulically setting binder, —from 0 to 15% by weight of an organic, silicon-free binder—and the preparation additionally contains from 0 to 35% by weight of water, where—the proportion of the particulate, refractory component is equal to 100 and the percentages of the further materials in the preparation are based on the particulate component.

Abstract: The invention relates to a method for continuously producing pre-ceramic polymers. The inventive method consists in synthesizing polymers, in separating polymers from a reaction mixture and in thermally conditioning for defining a cross linkage degree and rheological properties, wherein all said steps are integrated into a single method. The thus obtainable polymers are used in the form of an initial material for producing non-oxidized ceramics in ternary X/Y/N or X/Y/N/C quaternary systems. Said materials are characterized by the high mechanical, thermal and chemical resistance thereof, wherein any X and Y combination can represent in particular Si, B, P, Al, Ti, V, Zr, Ta elements.

Abstract: Provided is a sintered silicon wafer, wherein the volume ratio of silicon oxide contained in the wafer is 0.01% or more and 0.2% or less, the volume ratio of silicon carbide is 0.01% or more and 0.15% or less, and the volume ratio of metal silicide is 0.006% or less. Additionally provided is a sintered silicon wafer having a diameter of 400 mm or more and having the following mechanical properties (1) to (3) measured by collecting a plurality of test samples from the sintered silicon wafers: (1) average value of the deflecting strength based on a three-point bending test is 20 kgf/mm2 or more and 50 kgf/mm2 or less; (2) average value of the tensile strength is 5 kgf/mm2 or more and 20 kgf/mm2 or less; and (3) average value of the Vickers hardness is Hv 800 or more and Hv 1200 or less. Even in the case of a large disk-shaped sintered silicon wafer, it is possible to provide a sintered compact wafer having definite strength and similar mechanical properties as single crystal silicon.

Abstract: The invention relates to a process for the production of a molded porous ceramic article containing ?-SiC, which process comprises the following steps: the preparation of a molded article containing silicon and carbon and the subsequent pyrolysis and siliconization of the article containing silicon and carbon to form SiC. The invention further relates to a molded porous ceramic article containing SiC which has been produced from a molded article containing silicon and carbon.

Abstract: A precursor of a ceramic adhesive suitable for use in a vacuum, thermal, and microgravity environment. The precursor of the ceramic adhesive includes a silicon-based, preceramic polymer and at least one ceramic powder selected from the group consisting of aluminum oxide, aluminum nitride, boron carbide, boron oxide, boron nitride, hafnium boride, hafnium carbide, hafnium oxide, lithium aluminate, molybdenum silicide, niobium carbide, niobium nitride, silicon boride, silicon carbide, silicon oxide, silicon nitride, tin oxide, tantalum boride, tantalum carbide, tantalum oxide, tantalum nitride, titanium boride, titanium carbide, titanium oxide, titanium nitride, yttrium oxide, zirconium diboride, zirconium carbide, zirconium oxide, and zirconium silicate. Methods of forming the ceramic adhesive and of repairing a substrate in a vacuum and microgravity environment are also disclosed, as is a substrate repaired with the ceramic adhesive.

Abstract: A precursor of a ceramic adhesive suitable for use in a vacuum, thermal, and microgravity environment. The precursor of the ceramic adhesive includes a silicon-based, preceramic polymer and at least one ceramic powder selected from the group consisting of aluminum oxide, aluminum nitride, boron carbide, boron oxide, boron nitride, hafnium boride, hafnium carbide, hafnium oxide, lithium aluminate, molybdenum silicide, niobium carbide, niobium nitride, silicon boride, silicon carbide, silicon oxide, silicon nitride, tin oxide, tantalum boride, tantalum carbide, tantalum oxide, tantalum nitride, titanium boride, titanium carbide, titanium oxide, titanium nitride, yttrium oxide, zirconium, diboride, zirconium carbide, zirconium oxide, and zirconium silicate. Methods of forming the ceramic adhesive and of repairing a substrate in a vacuum and microgravity environment are also disclosed, as is a substrate repaired with the ceramic adhesive.

Abstract: A silicon carbide based porous material, which contains a metal silicide in an amount of 1 to 30% by mass and having a porosity of 38 to 80%, is provided.

Abstract: A porous fired body including a structure that aggregates are bonded by a bonding material, wherein the aggregates include oxide particles having a larger thermal capacity per unit volume than an SiC particle and SiC, the bonding material includes metallic Si, volume ratio of the metallic Si in the whole porous fired body is between 8 and 43% by volume, volume ratio of the particles of the oxide in the whole aggregates is between 14 and 55% by volume, the SiC particles and the oxide particles respectively include one or more particle groups, and an average particle size of each particle group is within a range of between 5 and 100 ?m.

Abstract: Carbides and nitrides are provided containing a controlled amount of pre-determined diluents and methods for their manufacture and use are disclosed. The pre-determined diluents include at least one of the silica, silicon metal, carbon, alumina, boron oxide, alkaline earth oxides such as calcium oxide, magnesium oxide, alkali oxides such as sodium oxide, potassium oxide, iron oxide, titanium oxide, and other components typically present in glass, ceramics, or metals. The carbides and nitrides with pre-determined diluents are formed by optionally pyrolyzing a precursor material to form a carboneous mixture and heat treating the carboneous mixture for a pre-determined time and at an elevated temperature during which carbon and/or nitrogen reacts with silica in the mixture to form carbides and/or nitrides and controlled amounts of pre-determined diluents.

Abstract: Method for treatment of workpieces of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the following steps: preheating of porous carbon workpieces under an inert gas to a selected operating temperature TB1, delivery of liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2 and impregnation of the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with formation of silicon carbide from carbon and silicon, gassing of the workpieces with inert gas, and cooling from the operating temperature TB3 to a conditioning temperature Tk, cooling of workpieces to room temperature, in step c the delivery of silicon and transport of the workpieces taking place over preferably cylindrical rolls which are porous at least in the exterior region and which are pivoted, and their speed of rotation determining the residence time for the delivery of silicon in step c, and t

Abstract: It is an object of the invention to provide a ceramic sintered body that has a dense structure and minimal cracking and that exhibits excellent sliding properties even in a non-lubricated state, as well as a process for its production and sliding parts that employ the same. According to a preferred mode, the sintered body of the invention comprises silicon carbide as the parent material and further contains a solid lubricant A with a mean particle size of no greater than 5 ?m and a solid lubricant B with a mean particle size of 10-70 ?m.

Abstract: The invention relates to a process for manufacturing a porous silicon carbide structure of the honeycomb type, said process being characterized in that it comprises the following steps: forming of a paste from a mixture of silicon carbide grains, the diameter d50 of which is between 5 ?m and 300 ?m, of an organic binder and of an inorganic pore former, in the form of particles based on silica, the overall porosity of said particles being greater than 70%; forming of a honeycomb-shaped green plastic monolith; drying of said monolith; and firing of the monolith at a temperature greater than 2100° C. The structure obtained by the process may be used as catalytic support in an exhaust line of a diesel or petrol engine or as particulate filter in an exhaust line of a diesel engine.

Abstract: A composite article includes a substrate and a protective layer on the substrate. The protective layer includes a non-oxide ceramic matrix and a refractory phase within the non-oxide ceramic matrix.

Abstract: A binder-free ceramic feedstock composition for thermal spraying on a surface of an article is provided. The composition comprises: an oxide ceramic powder and a boride and/or carbide ceramic powder. The boride and/or carbide ceramic powders are comprised of micron-sized particles, and the volume content of the oxide ceramic powder is in the range of about 1 to about 85 percent. A method for preparing the binder-free ceramic feedstock and a coated article by a thermal spraying process are also provided.

Abstract: A recrystallized silicon carbide body is provided that has a resistivity of not less than about 1E5 ?cm and a nitrogen content comprising nitrogen atoms bonded within the body, wherein the nitrogen content is not greater than about 200 ppm.

Abstract: There is provided a method for manufacturing a silicon carbide based honeycomb structure, the method using, as a part of a starting material, a recycled raw material recycled from a recovered material generated in a process for manufacturing the silicon carbide based honeycomb structure and derived from a starting material for a silicon carbide based honeycomb structure; wherein the recycled raw material is pulverized to have an average particle size of 10 to 300 ?m. According to the present invention, structure defects such as voids or coarse particles, which have been problems upon manufacturing a silicon carbide based honeycomb structure, are hardly formed, and a silicon carbide based honeycomb structure having excellent strength and uniform heat conductivity can be obtained. In addition, since a once kneaded material is used as a part of a starting material, the time for kneading can be shortened.

Abstract: A porous refractory product includes a matrix of sintered silicon carbide having a porosity of about 45% to about 65%. The matrix is formed by heating in a noble gas atmosphere a cast preform including a mixture of alpha-silicon carbide and boron carbide each having a particle size of less than about 1 micron. The heating causes the formation of gaseous SiO within the silicon carbide matrix, which, in turn, forms pores having an average size of less than about 1 micron. The porous refractory products herein are suitable for use in a variety of applications including for use in high temperature particulate filtering applications.

Abstract: A sputtering target contains Si and C as its major components and includes a texture in which a Si phase continuously exists in a net shape in gaps among SiC crystal grains. An average diameter of the Si phase is controlled to 1000 nm or less. The sputtering target is sputtered in an oxygen-containing gas, thereby depositing an optical thin film containing Si and O as its major components, and a third element other than the major components, a total amount of the third element being within a range from 10 to 2000 ppm.

Abstract: A high purity ceramic article having a typical pore size of at least about 15 ?m and an active impurity concentration of less than about 400 ppm can be prepared by molding ceramic powder, sintering to vaporize any active impurity components, washing to dissolve any remaining active impurity components with an acid solution, and oxidizing to remove any residual active impurity components.

Abstract: This invention relates to ?-SiC foam parts with a specific surface area preferably equal to at least 5 m2/g and with at least two zones A and B with a different cellular porosity distribution, wherein the parts were made by chemical transformation of a porous precursor medium comprising at least two blocks A? and B?, each having a different cellular porosity distribution, and in that the at least two zones A and B are derived from the chemical transformation of the two blocks A? and B?. This foam, optionally after deposition of an active layer, may be used as a filter medium in cartridges designed for the purification of exhaust gases. The invention also relates to manufacturing processes for preparing such a filter medium.

Abstract: Ceramics are made of preceramic paper or board structures in a particular shape previously represented in a paper structure, in which the preceramic papers or boards have a content of ceramic fillers between 30 and 95 wt-%, with the ceramic fillers having a particle size <30 ?m. A method for manufacturing such ceramics and the use thereof are also provided.

Abstract: A silicon carbide-based porous material characterized by comprising silicon carbide particles as an aggregate, metallic silicon and an oxide phase containing Si, Al and an alkaline earth metal; it is high in porosity and strength and superior in oxidation resistance and thermal shock resistance and, when used as a filter, is very low in risk of having defects such as cuts (which cause leakage of fluid) and the like, as well as in pressure loss.

Abstract: The present invention relates to a to novel electrical devices fabricated from polycrystalline silicon carbide (SiC) and methods for forming the same. The present invention provides a method for fabricating polycrystalline silicon carbide (SiC) products infiltrated with SiC-containing preceramic precursor resins to substantially mask the deleterious effects of trace contaminants, typically nitrogen and aluminum, while reducing operative porosity and enhancing manufacturing ease.

Abstract: A yttria sintered body contains an amount of silicon carbide within a range of 5 to 40% by volume, has a volume resistivity at room temperature within a range of 1×101 to 1×1017 ?·cm, and is adapted for application to an electrostatic chuck.

Abstract: A highly heat-conductive Si-containing material containing a Si phase whose lattice constant at room temperature is controlled at a level of more than 0.54302 nm but 0.54311 nm or less. Firing is conducted using a kiln material containing no B compound. With this highly heat-conductive Si-containing material and the process for production thereof, a reduction in heat conductivity can be prevented and a high heat conductivity can be exhibited stably.

Abstract: A Si—SiC based fired body includes a plurality of silicon carbide (SiC) particles serving as an aggregate, and silicon (Si) which serves as a binder and which is filled into gaps between the above-described silicon carbide particles, wherein the maximum particle diameter of the above-described silicon carbide particles is 0.5 mm or more, the content of silicon is 5 to 40 percent by mass, and the porosity is 0 to 5%. Preferably, the Si—SiC based fired body is in a thick-walled shape having a thickness of 20 to 200 mm.

Abstract: A highly corrosion-resistant SiC material is formed on a base body by a CVD process. The SiC material contains ?-SiC crystals so oriented that the ratio of the sum of peak intensities of x-ray diffraction for (220) and (311) planes of the ?-Sic csystals to the sum of peak intensities of x-ray diffraction for (111), (200), (220), (311) and (222) planes Of the ?-SiC crystals is 0.15 or above. The SiC material may contain both ?-SiC crystals and ?-SiC crystals of 6H structure. A base body with a SiC material by a CVD process is used as an internal component member of a semiconductor device fabricating system.

Abstract: Use of polyaminomethylenephosphonates as dispersing and/or wetting and/or stabilizing agents in formulations for cements, detergents, ceramic materials, dyes, synthetic resins, and rubbers, drilling fluids, reverse osmosis, as a substitution of or in combination with commercial products suitable for the purpose, characterized in that said polyaminomethylenephosphonates have the formula. (I) wherein n is integer higher than 2, M is hydrogen or a cation selected from those of alkaline metals and the ammonium ion, and the residues R, the same or different, are independently selected from 1. —CH2PO3M2, 2. —CH2R1 with R1 selected from —CH2OH, —CHOHCH3, —CHOHCH2CL, —CHOHCH2OH, 3. —(CH2)Mso3M, m being equal to 3 or 4, 4. —CH2CH2R2 with R2 equal to —CONH2, CONH2, —CHO, —COOR3, —COOX, CN, R3 being either —CH3 or —C2H5 and X a cation selected from the meanings of M and from the fact that said polyaminomethylenephosphonates are present in the formulation of interest in a weight quantity of over 0.

Abstract: A method for improving surface thermal shock resistance of a member made of ceramics to which thermal shock resistance is required comprising, forming homogeneously distributed linear dislocation structure on the surface of the member made of ceramics to which thermal shock resistance is required by blasting abrasives composed of fine particles whose average particle size is from 5 ?m to 200 ?m and whose surface shape is convex, wherein Vickers hardness (HV) of said fine particles is 800 or more and equal to or less than the hardness of the member made of ceramics to which thermal shock resistance is required.

Abstract: A method for producing a ceramic material product. A filler material is provided. The filler material is divided into filler granules collectively having a median diameter approximately 10 microns or less. An amount of carbon is provided. The carbon is divided into carbon particles and the carbon particles are allowed to coat the filler granules. The mixture of carbon-coated filler granules is formed into a selected shape. The formed mixture is placed in a substantial vacuum. The mixture is introduced to a pre-selected amount of silicon and the mixture of carbon-coated filler granules and silicon is heated to a temperature at or above the melting point of the silicon.

Abstract: A method for producing a ceramic material product. A filler material is provided. The filler material is divided into filler granules collectively having a median diameter approximately 10 microns or less. A pre-selected amount of carbon is provided. The carbon is divided into carbon dust and the carbon dust is allowed to coat the filler granules. The mixture of carbon-coated filler granules is formed into a selected shape. The formed mixture is placed in a substantial vacuum. The mixture is introduced to a pre-selected amount of fluid silicon and the mixture of carbon-coated filler granules and silicon is heated to a temperature at or above the melting point of the silicon.

Abstract: A porous ceramic body having increased strength is formed by exposing a porous ceramic body to a source of boron and heating the porous body to a sufficient temperature in an oxygen containing atmosphere to form the porous ceramic body. The porous ceramic body has a boron containing oxide glassy phase on at least a portion of the ceramic grains of the porous ceramic body.

Abstract: A porous ceramic body having increased strength is formed by exposing a porous ceramic body to a source of boron and heating the porous body to a sufficient temperature in an oxygen containing atmosphere to form the porous ceramic body. The porous ceramic body has a boron containing oxide glassy phase on at least a portion of the ceramic grains of the porous ceramic body.