Abstract: High rare-earth content glasses (Ln.sub.2 O.sub.3 .gtoreq.20 mol %) have applications as high optical density wavelength-selective filters, faraday rotators, scintillation glasses and high index glasses. New glasses are formed by adding TiO.sub.2 to the system SiO.sub.2 --B.sub.2 O.sub.3 --Al.sub.2 O.sub.3 --Ln.sub.2 O.sub.3. These glasses have improved optical properties, extended glass formation range and have superior resistance to devitrification. In some embodiments TiO.sub.2 can fully replace the Al.sub.2 O.sub.3. In additional embodiments, SiO.sub.2 can be completely removed from the glass.

Abstract: An aluminosilicate glass having a composition comprising, as calculated in weight percent on an oxide basis, of 40-57% SiO.sub.2, 2.0-11% Al.sub.2 O.sub.3, 1-16% CaO, 8-21.5% SrO, 14-31.5% BaO, 0-3% MgO, and 0-4% B.sub.2 O.sub.3, the glass having a temperature not over 1450.degree. C. at a viscosity of 20 MPa.multidot.s (200 poises), a CTE of 60-90.times.10.sup.-7 /.degree. C. and a strain point over 630.degree. C.

Abstract: Coloring pigment of comparable quality to, and cheaper than, pigments products by chemical precipitation, is made from synthetic magnetite produced by oxidation of ferrous mill scale and reduced to a particle size such that preferably at least 85% of the product does not exceed 10 microns and 95% does not exceed 20 microns. The smaller the particle size the greater the tinting strength of the pigment. The pigment may be black or, by calcination of the synthetic magnetite, it may be red. For best quality the black pigment should contain 95-99.5% iron oxides, typically, and the magnetite should have a molecular ratio of 0.9 to 1.1:1. The shade and hue of red is dependent upon the calcination temperature and final size and shape of the particles. Reduction to the required particle size for the red coloring pigment may be done before and/or after calcination.

Abstract: The invention relates to a borosilicate glass of high chemical resistance and low viscosity which contains zirconium oxide and lithium oxide. The borosilicate glass has hydrolytic resistance (in accordance with DIN ISO 719), class 1 acid resistance (in accordance with DIN 12116), and class 1 alkali resistance (in accordance with DIN ISO 659), and with a low operating temperature V.sub.A of between 1180.degree. C. to 1230.degree. C. and a coefficient of thermal expansion .alpha..sub.20/300 of 4.9.times.10.sup.-6 K.sup.-1. The borosilicate glass has the composition (in % by weight, based on oxide): SiO.sub.2 73-75; B.sub.2 0.sub.3 7-10; Al.sub.2 0.sub.3 5-7; ZrO.sub.2 1-3; Li.sub.2 0 0.5-1.5; Na.sub.2 0 0-10; K.sub.2 0 0-10; MgO 0-3; CaO 0-3; BaO 0-3; SrO 0-3; ZnO 0-3; ratio of SiO.sub.2 /B.sub.2 0.sub.3 .gtoreq.7.5; .SIGMA. SiO.sub.2 +Al.sub.2 0.sub.3 +ZrO.sub.2 80-83 and .SIGMA. MgO+CaO+BaO+SrO+ZnO.ltoreq.3, and fluorides 0-3.

Abstract: A .beta.-alumina electrocast refractory formed of a composition of 91-95 wt. % of Al.sub.2 O.sub.3, 2.0 wt. % or less of K.sub.2 O, 4.0-7.0 wt. % of Na.sub.2 O and K.sub.2 O in total, 0.15-2.0 wt. % of BaO, SrO and CaO in total, and 0.1 wt. % or less of Fe.sub.2 O.sub.3 and TiO.sub.2 in total.

Abstract: An aluminum nitride sintered body is characterized by having a g-value of an unpaired electron in a spectrum of an electron spin resonance being not less than 2.0010. The aluminum nitride sintered body is produced by sintering a raw material composed of powdery aluminum nitride at a temperature of not less than 1730.degree. C. to not more than 1920.degree. under a pressure of not less than 80 kg/cm.sup.2.

Abstract: A deep gray colored glass comprising 100 parts by weight of matrix components and coloring components consisting essentially of: from 0.8 to 1.4 parts by weight of total iron calculated as Fe.sub.2 O.sub.3, at most 0.21 part by weight of FeO, from 0.05 to 1.0 part by weight of TiO.sub.2, from 0.0005 to 0.015 part by weight of Se and from 0.02 to 0.05 part by weight of CoO, wherein the matrix components comprise from 65 to 75 wt % of SiO.sub.2, from 0.1 to 5.0 wt % of Al.sub.2 O.sub.3, from 10 to 18 wt % of Na.sub.2 O+K.sub.2 O, from 5 to 15 wt % of CaO, from 1 to 6 wt % of MgO and from 0.05 to 1.0 wt % of SO.sub.3.

Abstract: The invention comprises a novel type of glass for a cone (3) of a display tube envelope (1), said glass being manufactured by recycling screen glass and cone glass of display tube envelopes. A mixture of screen and cone glasses is supplemented with other glass-forming components to form a novel glass composition which can be used in cone glass applications. The glass is characterized by a relatively high BaO and SrO content. The glass has an x-ray absorption .mu. of at least 65 cm.sup.-1 at 0.6 .ANG..

Abstract: Glass having low solar radiation and ultraviolet ray transmittance, which consists essentially of a soda lime-silica type matrix glass containing from 0.53 to 0.70 wt % of total iron calculated as Fe.sub.2 O.sub.3, from 0.2 to 0.4 wt % of TiO.sub.2 and from 0.5 to 0.8 wt % of total cerium calculated as CeO.sub.2, wherein the weight of FeO calculated as Fe.sub.2 O.sub.3 is from 30 to 40% of the weight of the total iron calculated as Fe.sub.2 O.sub.3.

Abstract: A process for producing a zirconia beating opacifier is disclosed. The process comprising the steps of: (I) heat treatment of a zirconia bearing material comprising heating the zirconia bearing material in the presence of an additive to form a heat modified product having one or more phases which, when incorporated in a glaze and the glaze fired, exhibit opacifying characteristics; and (ii) cooling the heat modified product to produce a product which can be used for imparting opacity.

Abstract: Essentially mesoporous titanium oxide materials, having an average pore diameter of no more than about 100 .ANG. (e.g., from about 20 .ANG. to about 50 .ANG.) and an average surface area of no less than about 300 m.sup.2 /gm, preferably no less than about 500 m.sup.2 /gm are disclosed which optionally can contain an effective amount of at least one transition metal (e.g., a rare earth metal, iron, or the like) for stabilization. These materials can be formed by treating a titanium source, which is derived from a titanium alkoxide, in an organic-aqueous solution, with an organic structure directing agent (e.g., higher alkyl amine, optionally in the presence of an alcohol cosolvent) to form meso-sized micelles and hydrothermally treating the resulting composition.

Abstract: A method is disclosed for preparing crystalline aluminosilicate Y-type faujasite from a reaction mixture containing an organic template capable of producing Y-type faujasite. The reaction mixture contains only sufficient water to produce Y-type faujasite. In one embodiment, the reaction mixture is self-supporting and may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an added external liquid phase, so that excess liquid need not be removed from the crystallized product prior to drying the crystals.

Abstract: Transparent glass obtained from a mixture of oxides, wherein the mixture of oxides has the following composition, expressed as a percentage of the total weight:______________________________________ SiO.sub.2 59 to 78 B.sub.2 O.sub.3 2 to 8 Na.sub.2 O 3 to 8 K.sub.2 O 0.2 to 1.5 Li.sub.2 O 0.5 to 2.5 CaO 3 to 12 MgO 1 to 8 ZnO 0.2 to 3 Al.sub.2 O.sub.3 1.5 to 4 TiO.sub.2 0.1 to 0.8 ZrO.sub.2 0.7 to 2.5 Fe.sub.2 O.sub.3 0.01 to 0.3 SO.sub.3 0.01 to 0.3 CeO.sub.2 0.1 to 0.2 ______________________________________This glass is particularly strong.

Abstract: A pigment containing low-order titanium oxide of this invention is characterized in that both aluminum oxide and silicon oxide exist together with low-order titanium oxide. A method of manufacturing such a pigment comprises the steps of; presenting an aluminum compound and silicon as a reducing agents together with titanium dioxide: and then heating and reducing the mixture in an atmosphere having a low oxygen content. According to this method, the pigment containing low-order titanium oxide can efficiently be manufactured, while preventing sintering generated due to the fusion between the reducing agents or the reducing agents and powders.

Abstract: The present invention relates to a process for preparing zeolites having the MTT crystal structure, such as zeolites SSZ-32 and ZSM-23, using small, neutral amines capable of forming the zeolite, the amine containing (a) only carbon, nitrogen and hydrogen atoms, (b) one primary, secondary or tertiary, but not quaternary, amino group, and (c) a tertiary nitrogen atom, at least one tertiary carbon atom, or a nitrogen atom bonded directly to at least one secondary carbon atom (such as isobutylamine, diisobutylamine, diisopropylamine or trimethylamine), wherein the process is conducted in the absence of a quaternary ammonium compound.

Abstract: The present invention relates to a process for preparing medium pore size zeolites using small, neutral amines capable of forming the zeolite, the amine containing (a) only carbon, nitrogen and hydrogen atoms, (b) one primary, secondary or tertiary, but not quaternary, amino group, and (c) a tertiary nitrogen atom, at least one tertiary carbon atom, or a nitrogen atom bonded directly to at least one secondary carbon atom, wherein the process is conducted in the absence of a quaternary ammonium compound.

Abstract: An object of the present invention is to provide an alumina-magnesia oxide which can be fine pulverulent bodies by pulverizing. In the alumina-magnesia oxide of the present invention includes: 70-73 WT % of alumina component, which is converted into alumina (Al.sub.2 O.sub.3); and 27-30 WT % of magnesia component, which is converted into magnesia (MgO). The alumina-magnesia oxide is formed into a pulverulent body, which is a hollow grain having loosed bulk density of 0.15 g/cm.sup.3 or less and average grain diameter of 10 .mu.m or more.

Abstract: Clay materials, such as kaolin, containing expandable layer-silicates are chemically treated with a source of magnesium cations, followed by a pH adjustment, to provide a slurry product having improved rheological properties.

Abstract: The present invention disclosed a crystalline aluminosilicate which has the following characteristics:(A) an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio as determined by chemical analysis of from 5 to 11;(B) a unit cell dimension of from 24.45 to 24.55(C) a molar ratio of the Al contained in the zeolite framework to the total A1 contained in the aluminosilicate of from 0.3 to 0.9 calculated by the equations specified in the specification;(D) an alkali metal content, in terms of oxide, of from 0.02 to 1.5% by weight;(E) an X-ray diffraction pattern having peaks characteristic of zeolite Y; and(F) an ignition loss of from 0.5 to 20% by weight; anda process for producing the same, and a catalyst employing the same for the catalytic cracking of a hydrocarbon oil and the said catalyst which contains at least one metal selected from rare earth metals and alkaline earth metals.

Abstract: A method for preparing a ceramic composite having a core/bulk of tetragonal zirconia alloy and a shell/surface comprising zirconium boride by sintering a zirconia or zirconia and alumina composite article in an argon atmosphere while in contact with boron carbide.