Abstract: Polyurethane and poly(urea)urethane compositions as specified below are utilized as luting agents, for filling cavities or spaces in human or other animal bones, and are introduced in liquid form and formed in situ to create a polyurethane or poly(urea)urethane elastomer which is relatively compatible with the surrounding tissue, has good adhesive properties, low friability, and good tear and tensile strength. The invention includes the polyurethane and poly(urea)urethane compositions disclosed and their uses in the performance of surgery in human beings and other animals. The polyurethane and poly-(urea)urethane compositions are produced by the reaction of an "A" component prepolymer which is the reaction product of a diiosocyanate with a diol or polyol, and a two element "B" component, which may be any of the polyols used in producing the "A" component prepolymer or a relatively short chain diol or triol or a diamine (in the case of a poly(urea)urethane) or combinations thereof.

Abstract: Novel aqueous inorganic particle slurries, wherein some of the particles have had their charge potential altered to a sufficient extent to prevent segregation or settling of the particles, are described, along with a method for their preparation. The method of forming slurries of negatively charged particles comprises treating some of the particles with a cationic agent to reduce their charge and mixing these treated particles with the remainder of the particles to form a thick, cream-like flowable composition of a thixotropic nature. When slurries of positively charged particles are to be formed, an anionic agent is used instead of a cationic agent.

Abstract: A method for improving the high temperature properties of 42 to 70 percent by weight Al.sub.2 O.sub.3 containing alumina refractories by adding thereto a soluble metal compound and firing to at least 1450.degree. C. for a time sufficient to convert the soluble metal compound to a refractory oxide or phase and for the refractory oxide or phase to react with the non-Al.sub.2 O.sub.3 constituents of the refractory for preventing or reducing the presence or effect of detrimental compounds or phases on the high temperature properties of the refractory. The resulting relatively low Al.sub.2 O.sub.3 content, porous, alumina refractory includes within its pores from 1 to 10% by weight of a refractory oxide or phase and is characterized by high temperature property values substantially greater than the corresponding values for the same refractory body without said refractory oxide or phase in its pores.

Abstract: A method of reoxidizing a partially-reduced ceramic. The partially reduced eramic is heated in a chamber having a non-oxidizing atmosphere. An oxidizing gas is then introduced into the chamber at a rate which is sufficiently slow that cracking will not occur.

Abstract: A thick film conductor composition comprising an admixture of finely divided particles of noble metal and inorganic binder dispersed in organic medium in which the inorganic binder consists essentially of a bismuth silicate glass and/or bismuth germanate glass, ZnO and optionally Bi.sub.2 O.sub.3.

Abstract: Boron nitride containing titanium nitride in an amount of 0.05 to 10 wt. % which is produced at a relatively low temperature, utilizing a chemical vapor deposition technique. In the deposition process, boron, titanium and nitrogen source gases are introduced into an evacuated reactor together with a carrier and/or diluent gas and contacted with a heated substrate previously mounted in the reactor, whereby boron nitride with titanium nitride is deposited onto the substrate. The deposit thus obtained has a high density, a significantly improved heat-shielding ability, a high degree of anisotropy with respect to thermal diffusivity and a high chemical stability. By using such anisotropic boron nitride with BN ceramics, very useful BN type composite ceramics can be produced.

Abstract: The present invention relates to compositions for making sealing walls, dump linings and the like, especially barriers placed in the ground. The compositions contain expandable clay minerals, cement and fillers in aqueous suspension, as well as additives of alkali metal aluminates and alkoxy alkylsilanes. On the basis of these additives, the sealing action against water and pollutants is substantially improved, so that sealing walls prepared therefrom, especially in combination with an also pollutant-resistant sealing floor, can be used for the encapsulation of pollutants in permeable soils.

Abstract: Halogen glass is treated, while heated above its fusion temperature, with carbon disulphide. The resulting halogen glass is essentially free of parasitic absorption bands in the infra-red spectrum. The treatment with carbon disulphide apparently lowers the hydroxyl ion content and the metal-oxygen bonds sufficiently to avoid the infra-red absorption bands.

Abstract: A high strength glass-ceramic containing apatite and alkaline earth metal silicate (diopside/forsterite/akermanite) crystals having an excellent affinity for a living body and a process for producing the same are disclosed. The glass-ceramic is useful as an implant material such as an artificial dental root and an artificial bone.

Abstract: Highly densified silicon nitride sintered bodies having excellent mechanical strength and oxidation resistance consist essentially of Si.sub.3 N.sub.4 and contain Y, Mg and Zr, in which a content of Si.sub.3 N.sub.4 is 95-70% by weight, a content of yttrium is 15-2% by weight calculated as Y.sub.2 O.sub.3, a content of magnesium is 15-0.5% by weight calculated as MgO and a content of zirconium is 13-0.5% by weight calculated as ZrO.sub.2 and are produced by forming a mixed raw powder consisting of 95-70% by weight of silicon nitride raw powder, yttrium compound of 15-2% by weight calculated as Y.sub.2 O.sub.3, magnesium compound of 15-0.5% by weight calculated as MgO and zirconium compound of 13-0.5% by weight calculated as ZrO.sub.2 into a shaped body, said yttrium compound, magnesium compound and zirconium compound being sintering aids, and firing the shaped body at a temperature of 1,650.degree.-1,800.degree. C. under ambient pressure in a nitrogen or an inert gas atmosphere.

Abstract: Silicon nitride sintered bodies having particularly excellent strength and creep resistance at high temperatures, in which a total amount of MgO and Al.sub.2 O.sub.3 is more than 6% by weight and not more than 30% by weight and a weight ratio of MgO/Al.sub.2 O.sub.3 is 4-19, with the remainder being mainly Si.sub.3 N.sub.4. At least one of crystalline magnesium sialon represented by the general formula Mg.sub.x/2 Si.sub.6-y+x/2 Al.sub.y-x O.sub.y N.sub.8-y (O<x.ltoreq.y<8, preferably 0.9.ltoreq.x/y) and crystalline forsterite represented by the formula Mg.sub.2 SiO.sub.4 is contained as a second phase in addition to the main crystal of Si.sub.3 N.sub.4. The sintered bodies are produced by mixing a raw material powder of silicon nitride containing less than 2% by weight of oxygen with MgO and Al.sub.2 O.sub.3 so that a total amount of MgO and Al.sub.2 O.sub.3 is from 6% by weight to 30% by weight and a weight ratio of MgO/Al.sub.2 O.sub.

Abstract: In a ceramic dielectric composition with BaTiO.sub.3 as host material, CaTiO.sub.3 and Sb.sub.2 O.sub.3 are added to be contained, and besides thereto any one of Nd.sub.2 O.sub.3, La.sub.2 O.sub.3 and Sm.sub.2 O.sub.3 are added to be included, thereby ceramic dielectric composition having high dielectric constant, small voltage dependency of characteristics, large bending force, and small equivalent series resistance in high frequency range is provided.Also, by having BaTiO.sub.3 as host material and adding CaTiO.sub.3 and Ta.sub.2 O.sub.5 thereto, and further adding Sb.sub.2 O.sub.3 or Pr.sub.6 O.sub.11, similar superior characteristics to the above-mentioned ceramic high dielectric composition is obtainable.Besides, by adding SiO.sub.2 to the above-mentioned ceramic high dielectric compositions, strength is further increased.These ceramic dielectric composition of high dielectric constant is suitable for, for example, dielectric substance of laminated ceramic capacitor.

Abstract: This invention relates to ceramic high dielectric composition with BaTiO.sub.3 as major component; and by containing 1-5 weight part of CaTiO.sub.3, 2-3 weight parts of Nb.sub.2 O.sub.5 to 100 weight parts of the BaTiO.sub.3, a composition having dielectric constant of 3000 or above, less voltage dependency, a large bending strength and good high frequency characteristic is provided; and it has a good characteristic when used as thin film type dielectric body like multilayered ceramic capacitor.

Abstract: A composition for forming a high temperature, acid and alkali resistant refractory fiber. The compositional formulation, by weight, is 56-76% silica, 12-33% alumina, and 3-22% zirconia. These fibers are chemically resistant in both acidic and alkaline environments even when heat treated to temperatures exceeding 500.degree. F. (260.degree. C.) in such environments.

Abstract: Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers and copolymer salts of N,N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.

Abstract: A composition for forming a high temperature, alkali resistant refractory fiber. The compositional formulation, by weight, is 46-52% silica, 32-38% alumina, 13-18% zirconia with a silica to zirconia ratio in the range from 2.6 to 3.8. These fibers have a maximum service temperature in the range of 2550.degree. F. (1400.degree. C.) to 2650.degree. F. (1455.degree. C.) and exhibit better shrinkage resistance than similarly rated commercially available refractory fiber.

Abstract: A dielectric ceramic composition consisting essentially of:Pb(M.sub.1/3 Nb.sub.2/3).sub.x (M'.sub.a Nb.sub.1-a).sub.y (Fe.sub.2/3 W.sub.1/3).sub.z O.sub.3,wherein M represents Ni or Mg and x+y+z=1, andwhen M is Ni, M'=Fe, a=1/2, 0.01.ltoreq.x.ltoreq.0.40, 0.45.ltoreq.y.ltoreq.0.80 and 0.05.ltoreq.z.ltoreq.0.50; andwhen M is Mg, M'=Zn, a=1/3, 0.01.ltoreq.x.ltoreq.0.70, 0.15.ltoreq.y.ltoreq.0.45 and 0.05.ltoreq.z.ltoreq.0.60.The ceramic composition allows low-temperature sintering and exhibits high dielectric constant.

Abstract: An aluminosilicate ceramic product or article and a method of forming the article from as-mined ore. The product is useful as a proppant in gas and oil well fracturing. The ratio, on a calcined basis, of alumina to silica is between approximately 2.2 to 4.0. The amount of iron in the product is controlled as a function of the alumina to silica ratio so as to produce products having less than ten percent (10%) crush loss when subjected to a force of 10,000 psi.

Abstract: Alkali-free borosilicate glass have been developed having coefficients of thermal expansion (+20.degree. C. to +200.degree. C.) below 40.5.times.10.sup.-7, densities less than 3.0 g/cm.sup.3 and good visible and UV transmission, and can be produced by conventional continuous melting techniques. These glasses are particularly suitable for photomask, photovoltaic and mirror substrate applications. Their compositions comprise, in weight percent:______________________________________ SiO.sub.2 50-60% B.sub.2 O.sub.3 1-6% Al.sub.2 O.sub.3 12-15% MgO 0-2.5% CaO 0-5.1% BaO 9-10% ZnO 12-18% CeO.sub.2 0-5% As.sub.2 O.sub.3 + 0-1.5% Sb.sub.2 O.sub.3 PbO 0-1% ______________________________________Sum MgO+CaO+BaO+ZnO=21-33.5.

Abstract: Glass frit compositions for use in glazes or enamels have a fiber softening point of 535.degree. C. or more and are free of cadmium, lead and arsenic and consist essentially of Bi.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 with R.sub.2 O being 2-8% and RO being 0-9% by weight.