Abstract: This invention relates to improved fabrics used in the reinforcement of resin-bonded abrasive wheels. The fabrics are characterized by a coating of a novolak resin essentially free of added crosslinking agents.

Abstract: A method for compressing powder material into at least partially spherical articles in an apparatus comprising a die and upper and lower reciprocally movable punches. The die has a center bore through which the lower punch is reciprocable. The wall at the upper part of the die bore is enlarged to form a spherical zone portion of a hemispherical cavity. The end face of the lower punch has a concave shape to form a segment of the hemispherical cavity when the face of the lower punch is flush with the die cavity wall. The lower face of the upper punch defines a hemispherical cavity which mates with the hemispherical cavity of the die. In operation, the bore and die cavity are charged with powder material and the upper punch is brought into engagement with the die. A compaction stroke by the lower punch then forces the powder material into the spherical cavity. The upper punch is then withdrawn and the compacted spherical article is removed from the die.

Abstract: A method of making cemented titanium carbide base cutting tools with increased tool life is disclosed. Substantially unoxidized carbide and binder metal powders are ground to a sub-micron particle size in the presence of a low-boiling oxidation-inhibiting ingredient covering the particles of said powders. A low-boiling pressing aid is added. The ground powders are then subjected to air drying to evaporate said oxidation inhibiting liquid ingredient and the pressing aid consisting preferably of polyethylene glycol. After compacting the waxed ground particles to a predetermined configuration, the compact is first heated to volatize the wax at an appropriate temperature and critically in the presence of a nitrogen based atmosphere which may contain 0-10% H.sub.2. The dewaxed compact is then heated to a higher second temperature level for effecting sintering in the presence of a vacuum.

Abstract: A method for forming a uniformly mixed fibrous mat which comprises feeding a continuous high tensile modulus reinforcing fibrous material and a pre-cut thermoplastic fibrous material with a lower melting point or softening point than the temperature at which the reinforcing fibrous material melts or is damaged to a rotating rotor which is provided with projections to thereby cut the continuous fibrous material and pluck the pre-cut fibrous material, dispersing the thus treated fibrous materials into an air flow to mix the same and thereafter collecting the resulting mixed materials on a net to yield the mat. The product can thereafter optionally be compressed under heat to melt only the thermoplastic fibrous material to thereby consolidate the mat.

Abstract: There is disclosed apparatus for use in slip forming concrete structural members wherein concrete is fed through a hopper to the front end of an inverted "U" shaped forming chamber, which is caused to move over and along the top surface of a pallet by means of support rollers which engage rails along the sides of the pallet.

Abstract: An attachment for use in anchoring a safety belt on a vertically extending supporting member such as a frame member of a concrete wall form side includes a plate-like bracket member and a connecting member extending outwardly from one face of the bracket member. The bracket member is disposed on one side of the supporting member and projects outwardly beyond a vertical free edge thereof in use, while the connecting member is inserted through an opening in the supporting member, which may be an opening provided for other purposes in a frame member of a form side, for securing the attachment to the supporting member. An opening is provided in the projecting portion of the bracket member, and it serves to receive an element of a safety belt for connecting the belt to the bracket member.

Abstract: A laminated abrasive body which is in effect a thick compact comprising a plurality of diamond or cubic boron nitride compacts laminated together, joining of adjacent compacts taking place by means of a layer of a metal or metal alloy braze and the thickness of the laminate exceeding 5 mm and the longest dimension of the body transverse to the thickness exceeding 2 mm. The invention also covers methods of making such laminated bodies by forming alternate layers of braze and compact or compact-forming material and then forming the laminate under elevated temperature and pressure.

Abstract: A process is provided wherein solid mixtures of metal chlorides of, for example, ferric chloride, ferrous chloride, vanadium chloride and chromium chloride are (1) mixed with an alkaline material such as, for example, calcium oxide, calcium hydroxide and calcium carbonate, followed (2) by adding water to the resulting mixture to granulate said mixture whereby the metal chlorides are rendered substantially insoluble in water.

Abstract: The present invention relates to a process for the production of colored, fired, shaped clay products which comprises firing shaped, dried clay objects in a kiln, effecting carbon deposition on and into the resulting fired clay objects by heat treating the said fired objects in a carburizing atmosphere to produce a colored, fired, shaped clay product and thereafter cooling said colored product in an atmosphere of nitrogen.

Abstract: A low-density abrasive product formed of a uniform cross-section lofty web comprised of continuous three-dimensionally undulated inter-engaged autogenously bonded filaments of high yield strength filament-forming material impregnated with a tough adherent binder which adherently bonds the filaments together and also bonds a multitude of abrasive granules uniformly dispersed throughout the web. The abrasive article is made by forming the web by an extrusion process, uniformly coating the filaments of the web with a liquid curable binder resin, depositing the abrasive granules onto the web coating, curing the first binder coating, applying a second coating of liquid curable binder and then curing the binder.

Abstract: A mechanochemical method of polishing a gadolinium gallium garnet single crystal characterized by the use of a composition made of a polishing agent selected from the group consisting of aluminum oxide, cerium oxide, zirconium oxide and chromium oxide suspended in an alkaline silicate solution selected from a group consisting of sodium silicate solution and potassium silicate solution.

Abstract: Resinoid abrasive wheels are continuously produced by preparing pore forming granules having predetermined mechanical strength and containing a substance thermally decomposable at a baking temperature for the production of resinoid abrasive wheels and a blowing agent, kneading the pore forming granules with abrasive grains and a thermosetting synthetic resin binder to prepare an abrasive composition, molding the abrasive composition into a block, heating the block by a high frequency heater, rolling the heated block into a sheet by a multiplicity of pairs of rolls, blanking out circular pieces from the sheet, and baking the circular pieces to cure the binder therein and form pores by the decomposition of at least part of the thermally decomposable substance contained in the granules and by the decomposition of the blowing agent contained in the granules. The resinoid abrasive wheels obtained have pores uniformly dispersed therein.

Abstract: A process for the production of flexible graphite comprising incorporating particulate expanded graphite having a c direction expansion at least 10 times as great as that of the original c direction dimension with an organo-silicon high molecular weight compound having carbon and silicon as the skeletal components, such as polysilmethylenesiloxane, or with a colloidal silica, drying the resulting mixture, pressure molding the dried mixture and heat treating the molded mixture at 500.degree.-2000.degree. C. thereby to produce the flexible graphite. In one embodiment, this invention relates to flexible graphite obtained by the process.

Abstract: A method of making shaped articles from powders comprises forming a cup mold of an organic polymeric material such as nylon, cellulose acetate, polymethylmethacrylate, polypropylene or polyethylene. The inner surface of the mold corresponds in configuration with the outer surface configuration desired in the shaped article. This mold is placed in a support member and filled with a measured quantity of powder. A plunger composed of a metal having a high specific gravity is placed on top of the powder, and the mold, mold support, powder and plunger combination is positioned in the swing bucket of a centrifugal apparatus where it is subjected to centrifugal force sufficient to achieve the desired degree of compaction of the powder. The mold is then removed and subjected to treatment at a temperature which is sufficient in the first instance to eliminate the polymeric mold material, as by melting or burning, and then sufficient to sinter the powder.

Abstract: A component comprised of a composite compact, preferably diamond, and a substrate bonded to the compact. A preferred embodiment of the component is a cutter for a drill bit. The compact is comprised of a layer of bonded diamond or boron nitride particles and a base layer of cemented carbide bonded, preferably under high temperatures and pressures, to the particulate layer. The particulate layer is degradable by exposure to temperatures above a predetermined temperature. The substrate is bonded to the base layer of the compact with a filler metal which, to form a bond, requires the exposure of the surfaces to be bonded to a temperature substantially greater than the degradation temperature of the particulate layer. The component is fabricated by heating the base layer, filler metal and substrate to a temperature in excess of the degradation temperature while maintaining the temperature of the particulate layer below the degradation temperature via a heat sink.

Abstract: A thin sheet having a low rigidity is drawn while being depressed over the radiused corner of a die by elastic force or hydrostatic force to obtain a formed article whose sidewall part and flange part have no wrinkles. The force is applied through an elastic rubber provided around the punch and having an outside diameter larger than the inside diameter of the die cavity, or through an annular rigid body on which elastic pressure or fluid pressure is exerted. The hardness of the rubber is preferably approximately 70 to 85 in accordance with ASTM D 2240 Durometer A. A laminate not more than about 200 .mu.m in thickness and consisting of a thermoplastic resin film, aluminum foil and a heat-sealable resin film is drawn into a formed article or a container which is light in weight and suitable for containing foods, for instance.

Abstract: A nozzle pre-heating device is provided for use in a tower for prilling molten substances. The device comprises a pre-heating chamber which is open only at the upper portion thereof for pre-heating a prilling nozzle and is closed at the bottom to shield the nozzle from the cooling effects of upper flowing gas in the prilling tower. The device is provided with means for moving either the nozzle or the pre-heating device from proximity to one another when the pre-heating device is not in use, thereby permitting free flow of the molten substance from the nozzle during normal operation of the prilling tower.

Abstract: Water and particulate material are placed in the pelletizer and the pelletizer rotated. The size distribution of pellets at the output of the pelletizer is controlled by altering the amount of water, or particulate material injected into the pelletizer. The output of the pelletizer is screened into two or three discrete sized groups. The groups are periodically weighed and the ratios of their weight are compared to a predetermined standard or to the ratios of the weights of a previous set of groups. The amount of water injected into the system is altered responsively to an excess weight of either the smaller or the larger sized pellets.

Abstract: A coated abrasive belt backing material woven from 100% high tenacity polyester staple yarns in a sateen weave is heat set and destretched to a dimensional stability warpwise of less than 6.5% elongation at 170 pounds per linear inch of width tensile, while maintaining its desired width during such heat setting and destretching, cloth finished, coated with maker, abrasive and size, cured and product finished to form endless belts having superior properties of strength, toughness, body retention, pliability and base adhesion.

Abstract: The invention relates to an installation or plant for making sintered brick blanks, which includes a material preparation plant, a press and molding device, a drying and sintering device, a discharge device and feeding means, as well as a central power source, and control and monitoring devices. The material consisting, for example, of clay, loam, clay marl with aluminum oxide and liquid medium, is prepared in the material preparation device and is formed into a strand by means of an extruder in the form molding device. The strand is then cut into brick blanks by means of a strand cutter and a wire cutter. The brick blanks are transferred with suitable transfer means and a displacement device in a defined, spaced-apart relationship, onto a transfer truck and from there onto a drying and sintering truck. A plurality of drying and sintering trucks run in a closed series through a tunnel dryer at an optimum speed for the drying process.