Abstract: Disclosed are a low-temperature sinterable ceramic composition comprising 100 parts by weight of an essential component composed of from about 60 to 85% by weight of cordierite and from about 15 to 40% by weight of glass, and not larger than about 25 parts by weight of TiO.sub.2, and a monolithic ceramic substrate comprising the composition. The composition can be sintered at relatively low temperatures, and the sintered substrate has a small thermal expansion coefficient and a small dielectric constant. The temperature-dependent variation in the electrostatic capacity of the substrate is small. Preferably, the glass component in the composition is composed of about 20 to 60% by weight of SiO.sub.2, about 30 to 50% by weight of B.sub.2 O.sub.3, about 5 to 30% by weight of MgO, 0 to about 15% by weight of Al.sub.2 O.sub.3, and about 1 to 5% by weight of R.sub.2 O in which R is an alkali metal.

Abstract: Optical glasses or lenses are described having a refractive index that varies as a function of at least one coordinate, which is made from a starting material with a constant refractive index by ion exchange. Greater index gradients than with the prior art are achieved by special compositions and ion exchange baths intended therefor. In addition, the stability of the glasses is increased.

Abstract: High magnesium-content magnesium aluminosilicate glasses are used to form green tape compositions that are fired stepwise, i.e., first to about 500.degree. C. to remove organic materials, then to a temperature 10-30.degree. C. above the glass transition temperature for a time sufficient to nucleate the glass, and finally to a higher temperature near but below the softening temperature to complete crystallization of the glass. The resultant glass-ceramic may include substantial amounts of the forsterite crystalline phase. Multilayer ceramic printed circuit boards are made that are useful for high frequency, microwave applications. The fired high magnesium oxide content glasses have low dielectric constant and low dissipation loss factors, and they have a thermal coefficient of expansion that is compatible with metal or ceramic support substrates that impart mechanical strength to the printed circuit boards and that are thermally conductive. The boards are compatible with gallium arsenide devices.

Abstract: An optical glass has a large negative anomalous dispersion value and optical constants of refractive index (nd) within a range of 1.65-1.80 and Abbe number (.nu.d) within a range of 28-42. The optical glass includes, as its essential ingredients, in weight percent, 20-50% SiO.sub.2, 6-20% B.sub.2 O.sub.3 where SiO.sub.2 /B.sub.2 O.sub.3 .ltoreq.6, 0.5-15% ZrO.sub.2 and 31-50% Nb.sub.2 O.sub.5.

Abstract: A glaze composition suitable for a thin chip substrate, for example. The glaze composition makes a low-temperature glazing possible and is superior in the electrical and chemical stability. The glaze composition can prevent even a thin substrate from warping and can easily form an extensive smooth glaze layer without deteriorating a thin glaze face. The components of the composition are 20% to 50% by weight of boron oxide, 5% to 35% by weight of aluminum oxide, and 15% to 55% by weight of at least one alkaline-earth oxide selected from the group consisting of calcium oxide, strontium oxide, magnesium oxide and barium oxide.

Abstract: The present invention provides a vitreous-bonded abrasive tool wherein the abrasive grit portion comprises a thermally sensitive abrasive grain, such as sintered sol gel microcrystalline alpha alumina abrasive grain or superabrasive grain, and wherein the vitrified bond may be matured by firing at a temperature below about 875.degree. C. The invention further includes a novel vitrified bond composition.

Abstract: An optical glass having optical constants of refractive index within the range of 1.55-1.75 and Abbe number (.nu. d) within the range of 25-51 and having large negative anomalous dispersion which is substantially free of lead and arsenic compounds includes as its essential ingredients in weigth percent 10->40% SiO.sub.2, 12.5-35% B.sub.2 O.sub.3, 3-20% ZrO.sub.2 and 6-30% Nb.sub.2 O.sub.5.

Abstract: A heat-resistant glass which has heat resistance sufficient for being free from viscous flowing, e.g., at a temperature of 600.degree. C. or higher, and devitrification resistance adequate for producing a panel of glass, which has, as thermal properties, an expansion coefficient equivalent or close to that of a sealing glass frit, with retaining electrical insulation properties excellent over conventional glass, and which can be used for the production of plate-shaped articles of glass such as a glass substrate, the heat-resistant glass containing, as glass components,______________________________________ 30-45% SiO.sub.2 1-10% B.sub.2 Ohd 3 1-7% Al.sub.2 O.sub.3 1-17% SrO 22-less than 35% BaO 0-5% MgO and 0-14% CaO ______________________________________the above % standing for % by weight, provided that the total amount of MgO+CaO is over 4% to 16% by weight.

Abstract: Glasses for use as substrates for flat panel displays, having a composition consisting essentially of, as calculated in weight percent on an oxide basis, 38-56 SiO.sub.2, 10-28 Al.sub.2 O.sub.3, 0-4 Li.sub.2 O, 0-6 Na.sub.2 O, 0-15 K.sub.2 O, 4-18 CaO, 0-5 MgO, more than 8 and less than or equal to about 24 SrO, 0-2 ZrO.sub.2, said glass further consisting essentially of Na.sub.2 O+K.sub.2 O in total between about 6 and 18 weight percent.

Abstract: Multiphase ceramic materials for use in multilayered device fabrication may be fabricated by providing novel glassy precursor materials of a preferred composition, with operable amounts of a non-glassy filler materials. The combined materials are fired at appropriate temperatures, so that a non-glassy anorthite type phase is formed. Material so fabricated is formed in a self-limiting process, in that reaction between the glassy precursor material and the non-glass filler material is terminated when one constituent of the glassy precursor material is fully consumed. The materials of the instant invention, fabricated according to the method disclosed herein, demonstrate excellent dielectric constant, and electrical loss characteristics.

Abstract: A lead-free insulating glass composition comprises (A) 50 to 85 wt. % of a glass comprising, on a weight basis, 28 to 38% of SiO.sub.2, 4 to 10% of B.sub.2 O.sub.3, 8 to 16% of Al.sub.2 O.sub.3, 15 to 23% of MgO, 1 to 12% of CaO, 3 to 9% of BaO, 8 to 16% of ZnO, and 3 to 8% of ZrO.sub.2 ; and (B) 50 to 15 wt. % of at least one filler selected from the group consisting of alumina and zircon. When using this glass composition as an insulating layer of a thick-film multilayer circuit board, there can be obtained a highly reliable thick-film multilayer circuit board in which the warpage of the substrate and leakage current are greatly reduced and the withstand voltage is highly improved.

Abstract: A lead and cadmium-free encapsulant glass composition consisting essentially of by weight %, 60-80% Bi.sub.2 O.sub.3, 6-14% SiO.sub.2, 5-12% B.sub.2 O.sub.3, 5-10% Al.sub.2 O.sub.3 and 0-4% ZnO.

Abstract: An optical glass containing, as glass components,30.about.55 wt % of SiO.sub.2,5.about.30 wt % of B.sub.2 O.sub.3,the total amount of SiO.sub.2 and B.sub.2 O.sub.3 being 56.about.70 wt % and the SiO.sub.2 /B.sub.2 O.sub.3 weight ratio being 1.3.about.12.0,7.about.12 wt % of Li.sub.2 O, in which 7 wt % is excluded,0.about.5 wt % of Na.sub.2 O,0.about.5 wt % of K.sub.2 O,the total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O being 7 to 12 wt % in which 7 wt % is excluded,10.about.30 wt % of BaO,0.about.10 wt % of MgO,0.about.20 wt % of CaO,0.about.20 wt % of SrO, and0.about.20 wt % of ZnOthe total amount of BaO, MgO, CaO, SrO and ZnO being 10.about.30 wt %, and the total amount of SiO.sub.2, B.sub.2 O.sub.3, Li.sub.2 O and BaO being at least 72 wt %.

Abstract: A hermetic sealing composition consisting essentially of from 60 to 99 wt % of a bismuth type low melting glass powder and from 1 to 40 wt % of a low expansion ceramic filler powder, wherein the low melting glass has a composition consisting essentially of:______________________________________ Bi.sub.2 O.sub.3 77 to 95 wt %, MgO + ZnO 1 to 20 wt %, B.sub.2 O.sub.3 2 to 10 wt %, SiO.sub.2 0 to 1 wt % and CeO.sub.2 0 to 10 wt %.

Abstract: This invention is directed to the production of cuprous halide- or a cuprous-cadmium halide-containing glass articles which are essentially completely opaque to ultraviolet radiation and can be essentially completely opaque to radiation within the region of wavelengths of up to 550 nm, but are transparent to visible radiations having a wavelength longer than the radiation within the region of opacity. The method involves exposing the glass articles to a hydrogen gas-containing atmosphere at a temperature between about 375.degree.-500.degree. C. for a period of at least 18 hours to develop an integral reduced layer in at least one surface of the article having a depth effective to prevent the transmission of ultraviolet radiation and radiation having a wavelength up to 550 nm through the article.

Abstract: A glass-ceramic magnetic disk substrate which is prepared by forming, then heat treating, and then polishing a crystallizable glass composition comprising, expressed in terms of weight percent on the oxide basis: from 20 to 45% SiO.sub.2 ; from 25 to 45% Al.sub.2 O.sub.3 ; from 10 to 25% B.sub.2 O.sub.3 ; from 2 to 12% MgO; from 0.5 to 8% TiO.sub.2 ; from 0.5 to 5% P.sub.2 O.sub.5 ; from 0 to 2% Li.sub.2 O; from 0 to 2% Na.sub.2 O; from 0 to 3% K.sub.2 O; wherein, the total of the contents of Li.sub.2 O, Na.sub.2 O and K.sub.2 O is from 0 to 5%; and wherein the magnetic disk substrate comprises a main crystalline phase consisting of at least one member selected from the group consisting of mullite and aluminum borate crystals. The glass composition can easily be formed and the disk substrate can easily be polished, has excellent mechanical strength, surface flatness, surface smoothness, chemical durability, and heat resistance, and shows no deterioration of magnetic film characteristics by alkali migration.

Abstract: Using conventional glass frits for the production of black glass coating compositions makes it necessary also to use a relatively large quantity of black pigments. The quantity of pigment used may be reduced by using black glass frits according to the invention, thin layers of which already have a low transmission.The glass frit according to the invention is black and contains in the glass composition (in mol. %): 10-17% of K.sub.2 O, 10-25% of B.sub.2 O.sub.3, 15-30% of TiO.sub.2, 30 to 55% of SiO.sub.2, 0-5% of Al.sub.2 O.sub.3, 0-5% of Bi.sub.2 O.sub.3, 0.05-3% of Fe.sub.2 O.sub.3 (total iron) and 0.1-3% of sulphur (total sulphur).

Abstract: A method of strengthening a glass article by developing compressive stress in a surface layer on the article through an exchange of alkali metal ions in the surface layer at an elevated temperature below the glass strain point, the step of minimizing stress relaxation by carrying out the ion exchange in a glass essentially free from non-bridging oxygen atoms. Glasses having particular utility contain alumina in their compositions in such amount that the number of aluminum atoms in a glass are at least equal to the number of alkali metal ions, or contain both alumina and boric oxide in such amounts that the formula ##EQU1## is satisfied.

Abstract: The present invention relates to self-opacifying enamel frit compositions that can be used for the enamelling of aluminium or aluminium alloys.

Abstract: A nontoxic lead-free conductive paste comprising (a) a lead-free glass frit having a crystallization temperature of 700.degree.-870.degree. C. and consisting essentially of, by weight %, 20-38% of SiO.sub.2, 5.5-13.5% of B.sub.2 O.sub.3, 8-15.5% of Al.sub.2 O.sub.3, 4-19% of CaO, 20-29% of ZnO, 0-6% of ZrO.sub.2, 4-16% of TiO.sub.2 and 0.1-3.8% of MoO.sub.3 ; (b) finely divided particles of electrically conductive material; (c) at least one inorganic additive selected from the group consisting of bismuth oxide, zinc oxide-containing containing oxide material, manganese oxide, copper oxide and molybdenum oxide; and (d) an organic medium. The nontoxic conductive paste is free from environmental and health problems and results in conductors having excellent solderability, solder leach resistance, adhesion strength and electrical properties, both on ceramic substrates such as alumina or on dielectric bodies.

Abstract: A ceramic color composition comprising from 5 to 34 wt % of a heat resistant color pigment powder, from 65 to 94 wt% of a bismuth type glass powder, from 0 to 10 wt % of a refractory filler powder, and from 0.1 to 20 wt % of at least one additive selected from the group consisting of borides and silicides, as inorganic components.

Abstract: A photochromic glass having colorant incorporated in the glass composition to impart a permanent tint, and having its chromaticity point shifted from the blue-green side toward the red side of the white point in the CIE chromaticity coordinate system, and a method of producing such article by heating the article for a sufficient time, and at a sufficient temperature, in a dilute, hydrogen-containing atmosphere to so move the chromaticity point.

Abstract: Mixed alkaline earth boroaluminate glasses comprising BaO combined with at least one of CaO, SrO and MgO. The glasses are useful as frit binders in aluminum nitride-compatible, thick-film paste compositions used in thick-film printing of hybrid microelectronic circuits on aluminum nitride substrates.

Abstract: This invention is directed to the production of glass articles transparent to visible radiation, but opaque to ultraviolet radiation, rendering them particularly suitable for protecting the wearer of such lenses from exposure to laser radiation in the ultraviolet regions of the electromagnetic spectrum. The method involves exposing silver halide-containing glass articles to flowing hydrogen in a heat chamber operating at 375.degree.-500.degree. C. for at least four hours to produce an integral reduced layer in at least one surface of the articles of sufficient depth to prevent the transmission of ultraviolet radiation through the articles.

Abstract: A colored ceramic composition comprising, as inorganic components, from 5 to 40 wt % of a colored heat resistance pigment powder, from 60 to 95 wt % of a zinc-containing glass powder and from 0 to 10 wt % of a refractory filler powder, wherein said glass powder consists essentially of the following components:______________________________________ SiO.sub.2 27 to 40 wt % B.sub.2 O.sub.3 10 to 20 wt % ZnO 35 to 45 wt % Li.sub.2 O 0 to 5 wt % Na.sub.2 O 0 to 10 wt % K.sub.2 O 0 to 5 wt % Li.sub.2 O + Na.sub.2 O + K.sub.2 O 0 to 15 wt %.

Abstract: A glass frit for firing in reducing environments includes an unusually large amount of calcium fluoride melted therein. Also, a copper conductive composition includes the glass frit with an unusually large amount of calcium fluoride. This copper conductive composition may be a paste prepared for screen printing, in which case an appropriate screening agent known to one of ordinary skill may be incorporated, or the composition may be a fired film formed upon a suitable substrate. A high power surge resistor also incorporates the glass frit.

Abstract: An optical glass having optical constants of a refractive index (Nd) from 1.50 to 1.60 and an Abbe number (.nu.d) ranging from 62 to 73, a transformation temperature (Tg) of 550.degree. C. or below, and barely cracks or sticks to metal molds when the glass is subjected to mold pressing, maintains excellent chemical durability, and having softening capability at a low temperature which can be obtained by restricting the composition of the glass in weight percents within a specific range of a SiO.sub.2 --Al.sub.2 O.sub.3 --P.sub.2 O.sub.5 --R.sub.2 O system.

Abstract: A ceramic color composition comprising, as inorganic components, from 5 to 35 wt % of a colored heat resistant pigment powder, from 65 to 95 wt % of a crystalizable glass powder and from 0 to 10 wt % of a refractory filler powder, wherein said glass powder consists essentially of from 10 to 24 wt % of SiO.sub.2, from 60 to 75 wt % of Bi.sub.2 O.sub.3, from 0 to 15 wt % of B.sub.2 O.sub.3, from 0 to 4 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 0 to 15 wt % of BaO and from 0 to 3 wt % of TiO.sub.2.

Abstract: This invention is directed to the production of thermally crystallizable glasses which, upon heat treatment in contact with alumina particulates, will form a strong glass-ceramic-bonded composite body, the excellent bonding being attributed to the presence of lithium aluminoborate crystals. The glass-ceramic composition consists essentially, in weight percent, of______________________________________ SiO.sub.2 25-55 MgO 0-12 B.sub.2 O.sub.3 35-65 Li.sub.2 O + MgO 4-16. Li.sub.

Abstract: An amorphous ceramic glass composition having a density greater than about 2.1 g/cm.sup.3 comprises: between about 35 and 55% by weight SiO.sub.2 ; between about 18 and 28% by weight Al.sub.2 O.sub.3 ; between about 1 and 5% by weight CaO; between about 7 and 14% by weight MgO; between about 0.5 and 5% by weight TiO.sub.2 ; between about 0.4 and 3% by weight B.sub.2 O.sub.3 ; and greater than 0 and up to about 1% by weight P.sub.2 O.sub.5. A convenient source of raw materials is a mixture of coal ash waste, borax (or boric acid) manufacturing plant waste, and titanium pigment waste. The ceramic glass is formed from an intermediate ceramic mixture which is subjected to a heat treatment. The intermediate ceramic mixture is formed by heating a mixture containing SiO.sub.2, Al.sub.2 O.sub.3, CaO, MgO, TiO.sub.2, B.sub.2 O.sub.3, and Na.sub.4 P.sub.2 O.sub.7 to a temperature between about 1400.degree. and 1600.degree. C.; cooling the mixture at a controlled rate between about 15.degree. C. and about 30.degree. C.

Abstract: The invention is directed to a lead-free and cadmium-free thick film paste composition suitable for forming resistor or thermistor patterns on a substrate.

Abstract: This invention is directed to the production of a silver halide-containing glass article essentially free from silver halide crystals exhibiting a bright yellow coloration which strongly attenuates the transmission of ultraviolet radiation and radiation having a wavelength up to about 450 nm, said article having an integral reduced surface layer thereon, the depth of that layer being sufficient to effectively prevent the transmission therethrough of ultraviolet radiation and radiation having a wavelength up to about 450 nm.

Abstract: An optical glass including as its main ingredients in weight percent 25-50% SiO.sub.2, 16-40% B.sub.2 O.sub.3, 5-25% SrO and 1-10% Li.sub.2 O has optical constants of refractive index (Nd) of 1.55-1.65 and Abbe number (.nu.d) of 55-63 and a yield point (At) below 600.degree. C. which is suited for mold pressing.

Abstract: A novel heat-generating composition comprises an electrically conductive powder, and a crystallizable glass frit which is alkaline-earth borate glass essentially containing at least one component of rare-earth metal oxides and Bi.sub.2 O.sub.3. A novel heat-generating composition comprises a molybdenum silicide as an electrically conductive powder, a glass frit, and an additive which is metal oxide powder and/or metal powder. A novel heat-generating composition comprises a combination of a molybdenum silicide and a nickel silicide as electrically conductive powder, a glass frit, and a nickel powder as an additive. The heat-generating composition is sintered in a nitrogen atmosphere or in air, to produce a heater, which has a low electrical-resistance value and a good heat-resistance.

Abstract: A novel crystallizable glass composition for producing a novel low temperature co-fired glass-ceramic substrate having patterns of a low electrical-resistance conductor such as Ag, Ag-Pd, Au, and/or Cu is obtained. Being subjected to a firing process, the novel crystallizable glass can precipitate mullite as main crystalline phase, and at least one subordinate crystalline phase among forsterite, spinel, sapphirine, and similar crystalline phases. And also, the novel crystallizable glass powder composition with a inorganic filler as external additive having a minimum of 1.4 m.sup.2 /g. of mean specific surface area can precipitate both mullite phase and cordierite phase. The mixing weight ratio of the filler to the crystallizable glass powder is from 0.1/99.9 to 20/80. The crystallizable glass composition comprises following oxide components expressed in terms of percent by weight on the oxide basis; 45-58% of Al.sub.2 O.sub.3, 20-35% of SiO.sub.2, 5-15% of B.sub.2 O.sub.

Abstract: This invention relates to glasses especially suitable for use as substrates in plasma display panels, the glasses being essentially free from alkali metal oxides and consisting essentially, in weight percent, of______________________________________ SiO.sub.2 39-43 CaO 0-2.5 Al.sub.2 O.sub.3 2.5-9.5 SrO 10.5-21.5 B.sub.2 O.sub.3 1.5-4.5 BaO 25.5-39 MgO 0-1.5 MgO + CaO + SrO +BaO 45.5-52.5 Fining Agents 0-1.5.

Abstract: A high-refractive index phototropic glass having a refractive index of 1.69 to more than 1.7, an Abbe coefficient of at least 35 and a density of at most 3.5 g/cm.sup.3, has a composition (in % by weight based on oxide) of: SiO.sub.2 15-33; B.sub.2 O.sub.3 12-22; .SIGMA. SiO.sub.2 +B.sub.2 O.sub.3 30-50; Li.sub.2 O 0.5-5.0; Na.sub.2 O 0-3; K.sub.2 O 0-11; .SIGMA. alkali oxides 4-12; BaO 0-23; SrO 0-23; .SIGMA. SrO+BaO 0-23; ZrO.sub.2 5-14; Nb.sub.2 O.sub.5 15-24; Ta.sub.2 O.sub.5 2-11. As the carrier of the phototropism, the glass also has 0.10 to 0.35 of Ag.sub.2 O; 0.15-0.65 of Cl; 0.15-0.45 of Br and 0.005-0.030 of CuO. The glass can also be doped with 1-3 ppm of gold or one or more platinum metals, especially palladium.

Abstract: The present invention provides a method of adherently depositing a thick film composition on an aluminum nitride substrate comprising the steps of providing an aluminum nitride substrate, providing a thick film composition, and applying the thick film composition on the aluminum nitride substrate. The thick film composition includes a glass frit binder, a conductive metallic material and a lithium-containing adhesion promoting compound.

Abstract: In order to improve a reliability of a glass joint body, first ceramic member and second ceramic member are connected by using (a) glass consisting of 10.about.65 wt % of SiO.sub.2, 30 wt % or less of Na.sub.20, and the balance of B.sub.2 O.sub.3 and Al.sub.2 O.sub.3, (b) glass including less than 10 wt % of SiO.sub.2, and 30.about.80 wt % of B.sub.2 O.sub.3, (c) glass including substantially none of SiO.sub.2, and 30.about.80 wt % of B.sub.2 O.sub.3, or (d) glass consisting of 10.about.65 wt % of SiO.sub.2, 20 wt % or less of Na.sub.2 O, 30 wt % or less of Al.sub.2 O.sub.3, 20 wt % or less of MgO, and the balance of B.sub.2 O.sub.3.

Abstract: A dense barium crown glass consisting essentially of, as calculated in weight % on an oxide basis, 35-42% SiO.sub.2, 11-17% B.sub.2 O.sub.3, 5.5-7.7% Al.sub.2 O.sub.3, 35-42% BaO, 0.25-1.5% Li.sub.2 O. The glasses have a liquidus temperature bellow 900.degree. C. and a viscosity at the liquidus temperature that is greater than 1000 Pa.s (10,000 poises).

Abstract: A ceramic glass composition comprises: between about 35 and 55% by weight SiO.sub.2 ; between about 18 and 28% by weight Al.sub.2 O.sub.3 ; between about 1 and 5% by weight CaO; between about 7 and 14% by weight MgO; between about 0.5 and 5% by weight TiO.sub.2 ; between about 0.4 and 3% by weight B.sub.2 O.sub.3 ; and greater than 0 and up to about 1% by weight P.sub.2 O.sub.5. A convenient source of raw materials is a mixture of coal ash waste, borax (or boric acid) manufacturing plant waste, and titanium pigment waste. The ceramic glass is formed from an intermediate ceramic mixture which is subjected to a heat treatment. The intermediate ceramic mixture is formed by heating a mixture containing SiO.sub.2, Al.sub.2 O.sub.3, CaO, MgO, TiO.sub.2, B.sub.2 O.sub.3, and Na.sub.4 P.sub.2 O.sub.7 to a temperature between about 1400.degree. and 1600.degree. C.; cooling the mixture to solidify it; annealing the mixture at 600.degree. to 670.degree. C.

Abstract: An optical crown glass having a negative anomalous partial dispersion .DELTA.P.sub.g,F, a refractive index n.sub.d of greater than 1.52, an Abbe number .nu..sub.d of greater than 57, and a high UV transmission has a composition (in % by weight) 40-72 B.sub.2 O.sub.3, 9-31 Al.sub.2 O.sub.3, 0-15 SiO.sub.2, 0.1-0.5 H.sub.2 O, 0-12 Li.sub.2 O, wherein the total of R.sub.2 O (R=Li, Na, K, Rb, Cs) is 0-20 and the total of MO (M=Mg, Ca, Sr, Ba) is 0-30, and wherein the total of R.sub.2 O and MO is greater than 5, and the molar ratio between Al.sub.2 O.sub.3 and B.sub.2 O.sub.3 is 0.2-0.3 and the molar ratio between (R.sub.2 O+MO) and B.sub.2 O.sub.3 is 0.1-0.4.

Abstract: A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO.sub.2 30-50%; Al.sub.2 O.sub.3 10-25%; ZnO 8-25%; B.sub.2 O.sub.3 5-20%; TiO.sub.2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.

Abstract: This invention is directed to the production of lead-free enamels containing finely-divided glass particles, finely-divided pigment particles, and an organic binder wherein the glass particles consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 35-50 Li.sub.2 O + Na.sub.2 O + K.sub.2 O <8 B.sub.2 O.sub.3 23-30 CaO 1-5 Al.sub.2 O.sub.3 10-22 CaO + MgO + ZnO + BaO + SrO <7 Li.sub.2 O 1-3 TiO.sub.2 0-2 Na.sub.2 O 0-3 ZrO.sub.2 0-5 K.sub.2 O 2-5 ______________________________________said glass having a softening temperature T.sub.L above 650.degree. C. and thermal expansion coefficient below 60.times.10.sup.-7 /.degree.C. Among other applications, said glass can be used for the decoration of low-expansion glass-ceramic cooking plates.

Abstract: A non-photochromic R.sub.2 O-B.sub.2 O.sub.3 -SiO.sub.2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-12% Li.sub.2 O, 0-20% Na.sub.2 O, 0-12% K.sub.2 O, the Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu.sub.2 O, 0-1% CdO, 0-5% ZrO.sub.2, 0-0.75% SnO.sub.2, 0-1% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3, the glass containing 0-1.75%. Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li.sub.2 O, less than 10 cation % Al.sub.2 O.sub.3, at least 0.3 cation % Cu.sub.2 O and 0.50-2.0% Cl+Br.

Abstract: An optical glass which is a SiO.sub.2 --B.sub.2 O.sub.3 --(TiO.sub.2 +ZrO.sub.2)--SrO--BaO--R'.sub.2 O system of a specific composition range exhibits optical constants of a refractive index (Nd) of 1.57-1.75 and Abbe number (.nu.d) of 30-55, is free of PbO and has improved stability against devitrification and tinting and improved chemical durability.

Abstract: A non-photochromic R.sub.2 O--B.sub.2 O.sub.3 --SiO.sub.2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-12% Li.sub.2 O, O-20% Na.sub.2 O, 0-12% K.sub.2 O, the Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu.sub.2 O, 0-1% CdO, 0-5% ZrO.sub.2, 0-0.75% SnO.sub.2, 0-1% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3, the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li.sub.2 O, less than 10 cation % Al.sub.2 O.sub.3, at least 0.3 cation % Cu.sub.2 O and 0.50-2.0% Cl+Br.

Abstract: A resistor paste comprising an inorganic component which consists essentially of from 20 to 70 wt % of glass powder and from 30 to 80 wt % of a powder selected from the group consisting of SnO.sub.2 power, Sb-doped SnO.sub.2 powder and a mixture thereof, wherein the glass powder consists essentially of from 12 to 50 wt % of SiO.sub.2, from 0 to 20 wt % of Al.sub.2 O.sub.3, from 0 to 40 wt % of MgO, from 0 to 40 wt % of CaO, from 0 to 60 wt % of SrO, from 16 to 60 wt % of MgO+CaO+SrO, from 0 to 10 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O+Cs.sub.2 O, from 0 to 10 wt % of PbO, from 0 to 20 wt % of ZnO, from 0 to 10 wt % of ZrO.sub.2 +TiO.sub.2, from 8 to 40 wt % of B.sub.2 O.sub.3, from 0 to 60 wt % of Ta.sub.2 O.sub.5, from 0 to 50 wt % of Nb.sub.2 O.sub.5, from 0 to 60 wt % of Ta.sub.2 O.sub.5 +Nb.sub.2 O.sub.5, and from 0.1 to 20 wt % of Fe.sub.2 O.sub.3 +CuO+NiO+CoO+MnO+MoO.sub.3 +WO.sub.3 +Cr.sub.2 O.sub.3 +Bi.sub.2 O.sub.3 +CeO.sub.2 +Sb.sub.2 O.sub.3 +In.sub.2 O.sub.3 +SnO.sub.2.

Abstract: An overcoating inorganic composition is applied to a ceramic substrate for forming an overcoat thereon which has improved flexural strength, matches in thermal expansion with the substrate, and is reliable in that it is free of a crack and causes no variation in the resistance of thick film resistors even under rigorous service conditions. The overcoating inorganic composition contains 70-90% by volume of an inorganic glass component and 10-30% by volume of mullite powder and has a coefficient of thermal expansion in the range of from 50.times.10.sup.-7 to 75.times.10.sup.7 /.degree. C.

Abstract: A method for improving the characteristics of fused slag material is disclosed. This improved method results in a fused slag having resistance against pulverization at the cooling process for generation of yellowish turbid water due to contact of slag lumps with rain water, this method characterized by forming a slag treatment material by rough crushing a substantially dehydrated heat-treated material containing boron, and adding that slag treatment material to molten slag.