Abstract: A thermal shock-resistant alumina-mullite composite material and a preparation method thereof which are capable of concurrently obtaining the compactness of the material and a mullite formation. The material is comprised of 4.about.30 weight % of one aluminum silicate selected from the group consisting of kaolinite, silimanite, and kyanite, 75.about.94 weight % of Al.sub.2 O.sub.3 based on the total amount of Al.sub.2 O.sub.3, and 0.5.about.6 weight % of an alkaline earth metal oxide, wherein the weight ratio of the alkaline earth metal oxide to SiO.sub.2 is 1:2.about.1:3. The composition is first sintered at a temperature of 1450.degree..about.1650.degree. C. for 1.about.5 hours, then cooled down to 1000.degree. C., and then crystallized at a temperature of 1200.degree..about.1500.degree. C. for 1.about.20 hours. This composition is usable to a maximum temperature 300.degree. C.

Abstract: Plasticized inorganic powder batches comprising a cellulosic binder, water, and at least one inorganic powder exhibiting relatively high water affinity are compounded by combining the inorganic powder, prior to any contact with the water or cellulosic binder, with an organic surface treatment agent to decrease the water affinity thereof; subsequent mixing of the treated powder with the water and the cellulosic binder forms a plasticized inorganic powder batch with improved extrusion, molding, or other shaping characteristics.

Abstract: A monolithic refractory composition, which can be rapidly dried after being mixed with water and applied to a desired portion by casting or spraying to form a furnace wall, and which comprises refractory aggregates, a refractory powder, an aluminum alloy powder and a dispersant, wherein the aluminum alloy powder is contained in an amount of from 0.04 to 5 parts by weight per 100 parts by weight of the total amount of the refractory aggregates and the refractory powder.

Abstract: The invention is directed to a non-vapor phase process for forming a metal/ceramic composite containing a relatively inert metal such as silver, copper, or nickel by the reaction of a reactive metal or metal alloy containing the inert metal, and a sacrificial ceramic preform. The resulting metal/ceramic composite is essentially the same shape and dimensions as the sacrificial ceramic preform, and exhibits improved physical and mechanical properties, including improved corrosion and wear resistance.

Abstract: The present invention pertains to a refractory ceramic mass, consisting of 50 to 97 wt. % of sintered MgO as well as 3 to 50 wt. % of a spinel of the hercynite type.

Abstract: The disclosed invention is directed to novel ceramic compositions, and to stabilizer compositions for use with those ceramic compositions. The ceramic materials are formed of rare earth chromium oxides that include a novel combination of stabilizing compounds. Also, dryer or sterilizer devices which incorporate these ceramic compositions for generating infrared radiation for drying or sterilizing various articles.

Abstract: A castable refractory which comprises a matrix, making up 100 wt % in total, composed of 3-20 wt % of magnesia clinker having a particle diameter smaller than 0.21 mm and containing more than 95 wt % of MgO and 0.5-3.0 wt % of alumina cement in terms of CaO, with the remainder being alumina, and 0.1-3 wt % of ultrafine powder of amorphous silica and 41-100 wt % of alumina coarse grains having a particle diameter of 10-50 mm, both in terms of outer percentage of the amount of the matrix.

Abstract: A castable refractory which comprises a matrix, making up 100 wt % in total, composed of 3-20 wt % of magnesia clinker having a particle diameter smaller than 0.21 mm and containing more than 95 wt % of MgO and 0.5-3.0 wt % of alumina cement in terms of CaO, with the remainder being alumina, and 0.1-3 wt % of ultrafine powder of amorphous silica and 3-9 wt % of alumina coarse grains having a particle diameter of 8-20 mm, both in terms of outer percentage of the amount of the matrix.

Abstract: A high purity .alpha.-tricalcium phosphate ceramic having a superior biocompatibility for use mainly as a bone filler, is produced by shaping a powder material formed by a wet method, followed by sintering it and then cooling at a predetermined rate.

Abstract: The disclosed invention provides a method of forming refractory linings for maintaining refractory linings against attack by corrosive materials such as those present in steel manufacture. The method entails spraying an aqueous mixture of a refractory composition that includes at least one refractory material onto the working surface of a refractory lining. Spraying is performed to provide one or more layers of the refractory composition on the refractory lining after each exposure of the lining to corrosive materials such as those incurred in steel manufacture.

Abstract: A ceramic material which is (1) ceramics based on monoclinic BaO.multidot.sub.2 O.sub.3 .multidot.2SiO.sub.2 ; (2) ceramics based on monoclinic SrO.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2 ; or (3) ceramics based on monoclinic solid solution of BaO.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2 and SrO.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2.

Abstract: The present invention relates to ceramics and a method for making ceramics having very little dimensional change after sintering and high dimensional accuracies, so that the characteristics of inorganic functional material are fully maintained and utilized. The ceramics of the present invention comprise grains of inorganic functional material and grains of complex oxide. The pores existing between said grains of inorganic functional material are filled with said grains of complex oxide produced by a sintering reaction between an oxidized metal and an inorganic compound.

Abstract: The present invention pertains to a refractory ceramic mass, consisting of a pure magnesia component A and a component B, which consists of granules of pure magnesia, wherein the magnesia granules of component B have a ceating consisting of a refractory material whose granule size is fine compared with that of the magnesia granules and is chemically extensively inert with respect to the magnesia granule or reacts with the magnesia granule and/or itself consists of a plurality of components that are chemically reactive with one another.

Abstract: The present invention pertains to a refractory ceramic mass, consisting of 50 to 97 wt. % of sintered MgO as well as 3 to 50 wt. % of a spinel of the hercynite type.

Abstract: A binder for binding reinforcement materials is provided in which an aluminum and/or Group IIa-containing compound is combined, in a liquid, with a phosphorus-containing compound wherein said binder has a ratio of phosphorus to aluminum and/or Group IIa ions of 14 to 34, preferably 20 to 30. The binder is useful in binding reinforcement materials, particularly suited for preparing preforms for making metal matrix composite materials.

Abstract: The present invention relates to non-magnetic ceramic substrate material for magnetic head having similar thermal expansivity to the metal magnetic thin film, abrasion resistance during contact traveling of the magnetic tape and good processability and thus increasing lifetime by preventing exfoliation and crack of the magnetic thin film. The material comprises 10-35 mol % of CaO, 10-40 mol % of TiO.sub.2, 10-60 mol % of NiO and 10-50 mol % of CoO.

Abstract: A composition for the preparation of articles of calcium oxide, comprising calcined calcium oxide and an organic phase consisting of at least one polyol in an anhydrous medium. The composition may be used to form linings for molds and crucibles intended to come into contact with molten metals of groups IV and V of the periodic table.

Abstract: Alumina-based abrasive grain comprising rare earth oxide and calcium oxide and/or strontium oxide, and a method of making the same. The abrasive grain is useful in abrasive articles, such as coated abrasives, three-dimensional, low density abrasives, and bonded abrasives.

Abstract: Refractory or fireproof brick useful as tin bath bottom brick, wherein the brick is made of a calcium aluminate having both coarse and fine grain sizes, and a binder made of calcium aluminate.

Abstract: A composite substrate is provided, which comprises a cordierite-anorthite-boron base composite material and has a microstructure with anorthite included in the cordierite phase. This substrate can be used in the form of a circuit substrate, because it has high-enough mechanical strength, a coefficient of thermal expansion close to that of silicon and a decreased dielectric constant and, moreover, can be sintered at a low temperature.

Abstract: A mold powder for use in continuous casting, containing specified amounts of CaO, Al.sub.2 O.sub.3, TiO.sub.2, Li.sub.2 O, BaO, MgO, F and Na.sub.2 O, and further containing at least one of BN and C as aggregate. The mold powder, when used in continuous casting of a steel rich in strong reducing metal elements such as Al, Ti, REM and so forth, remarkably suppresses generation of deterioration in the surface quality of the slab and break out of the slab which are attributable inferior lubrication.

Abstract: The present invention relates to a method to manufacture a composite ceramic material having a high strength combined with bioactive properties, when the material is used as a dental or orthopedic implant, which includes preparing a powder mixture, mainly comprising partly a first powder, which in its used chemical state will constitute a bioinert matrix in the finished material , and partly a second powder, mainly comprising a calcium phosphate-based material. The invention is characterized in that said first powder comprises at least one of the oxides belonging to the group consisting of titanium dioxide (TiO.sub.2), zirconium oxide (ZrO.sub.2) and aluminum oxide (Al.sub.2 O.sub.

Abstract: The present invention discloses an alkali oxide free low density refractory material especially adapted for use as a disposable liner material for molten metal containing vessels. This material includes about 0.1 to about 2 weight percent of a stiffening agent, about 0.1 to about 2 weight percent of a set retarding agent, about 0.1 to 6 weight percent of density reducing materials, about 0.1 to about 5 weight percent of a plasticizer, up to about 2 weight percent of a secondary binder, and the balance of a refractory aggregate which is preferably MgO. The stiffening agent and set retarding agent are used in substantially the same amounts to provide the disclosed refractory material with increased resistance to slumping while, at the same time, allowing spraying apparatus residence times of up to 30-40 minutes without clogging. The composition includes less than about 0.

Abstract: Ceramic binder for forming and processing ceramic ware, comprising a sol-gel of a mixture of highly charged metal hydroxy cations and one or more low charged metal hydroxy cations, which are able to form an aqueous sol.

Abstract: A composition comprising an alpha alumina substrate having a first coating layer of calcium pyrophosphate and a second coating layer of hydrous alumina, and to a calcined composition comprising an alpha alumina substrate having a first coating layer of calcium pyrophosphate and a second coating layer of a densified anhydrous, crystalline form of alumina and to a method for preparing the same.

Abstract: A process is presented for the fabrication of a metal/ceramic composite by a non-vapor phase oxidation of a molten metal by contacting said molten metal at an elevated temperature with a sacrificial ceramic preform. The shape of the preform is retained but the ceramic preform is reduced, oxidizing the molten metal. A preferred sacrificial ceramic preform is silica, but can also be, for example, mullite, titania or zirconia, and the preferred molten metal is aluminum or an aluminum alloy. Thus, for example, is produced from immersing a silica preform into molten aluminum alloy, an Al/Al.sub.2 O.sub.3 composite metal/ceramic article which does not contain silica or silicon and which is extremely tough.

Abstract: A monolithic refractory with improved resistance to molten aluminum and a method of imparting the resistance by adding 0.2 to 1 wt.% polyvinyl chloride powder to the base mix.

Abstract: A process for forming a shaped article comprised of mullite whiskers comprising the following steps:a. preparing a mixture of aluminum fluoride and silicon dioxide in a weight ratio of about 7:3;b. firing the mixture in air at a temperature above about 750.degree. C. until complete conversion to topaz takes place;c. mixing the topaz product of step (b) with silicon dioxide in a weight ratio of about 18:1 together with a binder and firing at a temperature of above about 1400.degree. C. until complete conversion to mullite occurs.

Abstract: A process for producing a high density ceramic of perovskite represented by the formula:ABO.sub.

Abstract: This invention provides a transparent ceramic article comprising aluminum oxide and aluminum magnesium oxynitride. The ceramic article of the present invention is useful in applications where it is desirable to have an optically transparent ceramic including, for example, in orthodontic brackets, ferrules, and gas tight envelopes.

Abstract: A process for producing strong alumina ceramics in which needle-shaped .beta.'"-alumina grains are homogeneously distributed in an .alpha.-alumina matrix to provide an increase in bending strength, as compared to the alumina ceramics without .beta.'"-alumina, when fired under similar conditions. The process comprises mixing .alpha.-alumina powder and salts of sodium and magnesium, in a Na:Mg mol ratio of 1:2; wet-mixing and calcining the mixture to form a mixture of (100-5X) mols of Al.sub.2 O.sub.3 +X(Na.sub.2 O+4MgO), wherein X is the number of mols and is not more than 3; forming a dense green body of the calcined mixture and sintering the green body at a temperature and for a time sufficient to form in-situ particles of .beta.'"-alumina distributed in the .alpha.-alumina.

Abstract: The ceramic sinter is composed of a metal oxide such as ZrO.sub.2 and 10-90 vol. % of metal fluoride which is selected from the group having not less than 2.5 electronegativity difference between fluoride and the metal element.The ceramic sinter has a thermal expansion coefficient of 15-20.times.10.sup.-6 /.degree.C. and is suitable for bonding with general use metals such as stainless steel to form a composite body of the ceramic sinter and the metal without causing a substantial thermal stress at the juncture thereof.

Abstract: A multilayer ceramic substrate comprises plural conductive layers and insulation layer for insulating the plural conductive layers, and the insulation layer is made of an inorganic composition comprising at least one member selected from the group of Al.sub.2 O.sub.3 and ZrO.sub.2, SiO.sub.2, PbO, and at least one member selected from the group of BaO, CaO and ZnO in predetermined range. The multilayer ceramic substrate can be sintered at low temperature in the air and is splendid in a heat resistance, a solderability and resistance value of the insulation layer and furthermore, a microcrack is not caused in a laser trimming of a top resistance film.

Abstract: A process for preparing monoclinic celsian from AlF.sub.3, Al.sub.2 O.sub.3, BaCO.sub.3, and fused SiO.sub.2 powders by heating an intimate mixture of the powders (1) at from about 700.degree. to 900.degree. C. to form topaz and then (2) at a temperature as low as 900.degree. C. to produce monoclinic celsian. The reactions take place in an atmosphere of the gases generated by the reactions.

Abstract: An alkaline earth metal aluminosilicate sintered body is obtained by molding a starting mixture of a zeolite having an alkaline earth metal form and an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio not higher than 3.0 and a boron compound such as boron oxide, and firing the molded body at a temperature lower than 1,000.degree. C. An amorphous calcination product formed by calcining the zeolite may also be used in the starting mixture with the boron compound. This process allows the range of firing temperatures suitable for formation of a sintered body to be varied over a range of from about 50.degree. to 150.degree. C. or more while also allowing lower firing temperatures than in the absence of the boron compound to be used while still obtaining the desired densified sintered body.

Abstract: Insulating lightweight refractory materials which are resistant to attack by molten metals, particularly molten aluminum and its alloys and compositions used to form such materials. The materials are settable compositions which comprise a mixture of ceramic fibres, wollastonite powder, milled and/or screened vermiculite (optional), aqueous colloidal silica having a solids content of about 5-25% and preferably 12-15% by weight, and unmilled vermiculite. The weight ratio of the ceramic fibers to the wollastonite powder to the milled and/or screened vermiculite (when present) is 0.8-1.2:1.5-2.5:0.25-0.75, respectively. The amount of the unmilled vermiculite is up to 50% by weight of the total weight of the other solid ingredients. The composition optionally contains carbon fibres, metal fibres or inorganic fibres as reinforcements. The composition can be cast to form shaped products or used as a joining material or as a "face-off" material to protect an underlying article.

Abstract: A process for preparing monoclinic celsian from topaz and BaCO.sub.3, pows by heating an intimate mixture of the powders at a temperature of from 900.degree. C. to less than 1590.degree. C. in an atmosphere of the gases generated by the monoclinic celsian formation reaction itself.

Abstract: The invention relates to a composite body comprising a first part of ceramic material, a second part of metallic material, of ceramic material or of a mixture of metallic and ceramic material, and a third part of a melting ceramic which seals together the first and second parts, and comprises a frit of Al.sub.2 O.sub.3 and either one or more alkaline earth metal oxides or one or more rare earth metal oxides or a combination of these two oxides. According to the invention, the melting ceramic contains a filler material which occupies at least 20% and at most 50% of the volume of the melting ceramic.

Abstract: Hydrogel-bound aggregate lightweight building materials, such as blocks for use in replacement of lightweight concrete or extruded clay blocks, prepared by expanding and drying a foamable composition containing precursors for an alkali metal aluminosilicate hydrogel, fine grain particulate aggregates, and a viscosity-reducing agent sufficient to result in a starting slurry composition viscosity of less than 40,000 cps at a solids content of 70% by weight or greater.

Abstract: Novel calcium dialuminate/hexaluminate ceramic structures in the form of blends, laminates and composites, and processes for making these structures are disclosed. The ceramics of the invention exhibit relatively lower levels of thermal expansion, high strengths, and good thermal shock resistance over wide temperature ranges.

Abstract: A refractory composition is disclosed which possesses low porosity, high density, exceptional strength and high abrasion resistance and is useful for lining fluid catalytic converter units, e.g., catalyst transfer lines, riser lines, J-bends, cyclones and all other areas where hot abrasion resistance and low thermal conductivity are desired. The composition consists essentially of by weight: (a) 44 to 89% of an abrasion-resistant refractory grain; (b) 10 to 50% of a hydraulically setting cement; (c) 1 to 6% of a filler consisting of very fine, substantially spherical particles of a metal oxide selected from the group consisting of Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, clay minerals, carbon and fume SiO.sub.2 ; and (d) 0.01 to 1%, based on the total weight of the constituents (a), (b) and (c), of additives selected from deflocculants and wetting agents.

Abstract: A multilayer printed circuit board comprises plural insulating layers integrated into one body, and internal wiring conductor layers located on the internal insulating layers, characterized in that conductor paths in each internal conductor layer are locally separated from the insulating layer by a cavity or porous layer provided at the boundaries between the path and insulating layer adjacent thereto. At least one insulating layer between internal conductor layers may be provided with a layered space or porous layer therein.

Abstract: In processes of forming a refractory mass on a surface, a mixture of refractory particles and oxidizable particles which react exothermically with oxygen to generate sufficient heat to soften or melt at least the surfaces of the refractory particles are sprayed against that surface to bring about formation of said refractory mass. To promote the reliable and consistent formation of a durable refractory mass, the granulometry of the particles which are sprayed in the mixture is such that the 80% and 20% grain sizes of the refractory particles (that is, the screen mesh sizes G.sub.80 and G.sub.20 through which respectively 80% and 20% by weight of the particles will pass) have a mean greater than the mean of the 80% and 20% grain sizes of the oxidizable particles and the size range spread factor f(G) of the refractory particles is at least 1.

Abstract: Porous ceramic greenware comprising finely divided ceramic filler, finely divided metal, and polyolefin controls shrinkage in fired shape. In a preferred embodiment the metal and ceramic filler are bound together with the clean burning polyolefin and a plasticizer. After molding the mixture into the final shape, the plasticizer is removed to introduce porosity into the shaped article. Next the article is heated to decompose the polyolefin which can exit as a gas through the pore openings. Finally, the article is fired to a high temperature to oxidize the metal to metal oxide which becomes sintered with the ceramic filler particles to form a sintered porous article where the oxidized metal bonds the filler particles together in the desired shape.

Abstract: A mixture of powdered metals and oxides used in ceramic welding for repairing fire brick linings of industrial ovens by blowing the powdered mix on hot oven walls in a stream of oxygen, where the powders have the characteristics providing for initial ignition of the stream of particles in the flame zone before they strike the oven wall and the oxidation continues after the particles form refractory mass on the oven wall.

Abstract: Insulating lightweight refractory materials which are resistant to attack by molten metals, particularly molten aluminum and its alloys and compositions used to form such materials. The materials are settable compositions which comprise a mixture of ceramic fibers, wollastonite powder and aqueous colloidal silica having a solids content of about 5-25% and preferably 12-15% by weight. The weight ratio of the ceramic fibers to the wollastonite powder is 0.8-1.2:1.5-2.5, respectively. The composition optionally contains carbon fibers or metal fibers as reinforcements. The composition can be cast to form shaped products or used as a joining material or as a "face-off" material to protect an underlying article. When dried, the composition forms a material which is insulating, light-weight and resistant to high temperature and chemical attack by metals. The material can be made even more resistant to attack by a silicate and/or fluoride surface treatment.

Abstract: A moldable refractory composition comprising a ceramic alumina-silica fiber, a colloidal silica, an organic adhesive, wollastonite, and a liquid vehicle such as water forms a molten aluminum resistant refractory when dried.

Abstract: A dielectric ceramic composition for temperature compensating monolithic ceramic capacitors consists essentially of a solid solution composed of barium oxide, strontium oxide, silicon oxide and zirconium oxide, which, when calculated in terms of BaO, SrO, SiO.sub.2 and ZrO.sub.2 respectively and expressed by the formula:x(BaO.sub.1-.alpha. SrO.sub..alpha.)--ySiO.sub.2 --zZrO.sub.2(wherein x, y, z are the weight percentages of the respective components, x+y+z=100, and 0.ltoreq..alpha..ltoreq.0.9), have compositional proportions falling within the polygonal area defined by the points A, B, C and D in FIG. 1, the sets of x, y and z at said points A, B, C and D being as follows:______________________________________ x y z ______________________________________ A 50 49 1 B 50 20 30 C 15 20 65 D 15 84 1 ______________________________________The composition may contain, as an additive, aluminum oxide in an amount of not more than 20 parts by weight in terms of Al.sub.2 O.sub.

Abstract: Disclosed herein is a foamable, self-setting ceramic composition which can be poured into molds or injection-molded or extruded to achieve desired shapes, and thereafter fired to produce shaped, porous ceramic articles useful as filter elements, insulation, kiln furniture, molds furnace linings or other like articles, the composition containing agents capable of developing an aluminosilicate hydrogel and capable of generating gas to produce porosity within the hydrogel bound molded shape.

Abstract: Low mass kiln furniture for supporting ceramic ware during the firing thereof is provided having excellent thermal shock resistance and high temperature stability, the kiln furniture being comprised of a porous refractory ceramic body of low density prepared by the firing of a porous aluminosilicate-bound aggregate of refractory ceramic compounds, and wherein the ceramic body has on one or more of its surfaces a smooth skin in the form of an integral thin porous ceramic membrane layer.