Abstract: The invention provides:(1) a glass composition comprising about 20 to about 85% of SiO.sub.2, about 2 to about 75% of B.sub.2 O.sub.3, 15% or less of Al.sub.2 O.sub.3, about 30% or less of at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O, Rb.sub.2 O and Cs.sub.2 O, about 10% or less of at least one of MgO, CaO, ZnO, BaO, SrO and PhO, about 10% or less of at least one of ZrO.sub.2, La.sub.2 O.sub.3, Y.sub.2 O.sub.3, Ta.sub.2 O.sub.3 and Gd.sub.2 O.sub.3, and about 0.05 to about 15% of at least one copper halide; and(2) a glass composition comprising about 8 to about 25% of SiO.sub.2, about 5 to about 35% of P.sub.2 O.sub.5, about 30% or less of B.sub.2 O.sub.3, about 10 to about 35% of Al.sub.2 O.sub.3, about 5 to about 20% of at least one of LI.sub.2 O, Na.sub.2 O, K.sub.2 O, Rb.sub.2 O and Cs.sub.2 O, about 20% or less of at least one of MgO, CaO, ZnO, BaO, SrO and PbO, about 10% or less of at least one of ZrO.sub.2, La.sub.2 O.sub.3, Y.sub.2 O.sub.3, Ta.sub.2 O.sub.3 and Gd.sub.2 O.sub.3, and about 0.

Abstract: A novel devitrifying glass comprising, in weight percent, from 5-15% of zinc oxide, from 10-18% of magnesium oxide; from 15-20% of calcium oxide; from 6-14% of barium oxide; from 15-20% of aluminum oxide and from 30-40% of silicon dioxide. The glasses are thermally matched to alumina substrates. The glasses form overglaze thick film inks when admixed with an organic vehicle that are useful as protective coatings for alumina substrates and multilayer printed circuits.

Abstract: The invention relates to a dental filling material containing at least one polymerizable (meth)-acrylic acid ester, characterized in that it contains 20 to 90% by weight, calculated on the total composition, of a compound consisting of the structural element E2 and at least one of the structural elements E1 and/or E3 and/or E4 of the general formula ##STR1## where R.sub.1 denotes a methyl, ethyl, n-propyl, isopropyl or an unsubstituted or CH.sup.3 --C.sub.3 H.sub.7 --substituted phenyl radical, R.sub.2 denotes a CH.sub.2 .dbd.CH--, CH.sub.2 .dbd.CHCOO(CH.sub.2).sub.n --]or ##STR2## or R.sub.1, n denotes 0, 1, 2 or 3, and M denotes titanium or zirconium.

Abstract: Vanadium garnet materials and a method for their preparation. The vanadium garnet material has a trivalent vanadium cation and a composition that falls within a specific prismatic-shaped volume in a quaternary composition diagram of MnO, CaO, V.sub.2 O.sub.3, and SiO.sub.2. The prismatic-shaped volume represents compositions of liquids with which said vanadium garnet is in equilibrium on the liquidus surface and from which the vanadium garnet phase is crystallized. A typical vanadium garnet material has the formula Mn.sub.1.3 Ca.sub.1.7 V.sub.2 Si.sub.3 O.sub.12, as provided in the drawing by point F. The vanadium garnet materials may be used in laser applications.

Abstract: Porous glass consisting essentially of silica, zirconia and an alkali metal compound, wherein the content of zirconia is at least 5% by weight and the content of the alkali metal compound is at least 2% by weight as calculated as M.sub.2 O wherein M is an alkali metal element, and the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 0.2 ml/g, and the proportion of the pore volume (B) of pores having pore radii of from 100 to 10,000 .ANG. to the total pore volume (A) of pores having pore radii of from 210 to 10,000 .ANG. is at least 80%.

Abstract: This invention is drawn to heavy metal oxide glasses exhibiting high nonlinear susceptibility and infrared transmission consisting essentially, in weight percent, of 42-48% PbO, 33-44% Bi.sub.2 O.sub.3, 10-15% Ga.sub.2 O.sub.3, and up to 15% total of at least one member of the group consisting of up to 5% SiO.sub.2 and/or GeO.sub.2 and up to 15% Tl.sub.2 O. This invention also comprehends the fabrication of light guiding fibers from those glasses.

Abstract: This invention is directed to the production of glasses demonstrating working temperatures below about 450.degree. C., transition temperatures no higher than about 350.degree. C., and good resistance to attack by mild aqueous alkaline solutions consisting essentially, expressed in terms of mole percent on the oxide basis of______________________________________ Li.sub.2 O 0-25 ZnO 25-50 Na.sub.2 O 5-20 Al.sub.2 O.sub.3 0-3 K.sub.2 O 0-12 P.sub.2 O.sub.5 25-37 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 15-35 SnO 0-10 ______________________________________to which are included 0.5-8% Cl and 0-5% F., as analyzed in weight percent.

Abstract: Low silica ceramic fiber compositions comprising from 46-49% alumina, 23-25% silica and 27-29% zirconia.

Abstract: Means to decrease the effects of polymerization shrinkage, increase stiffness, decrease the coefficient of thermal expansion to a greater extent than previously possible, and improve the durability of composite restorations by use of improved microcrystalline glass inserts. Shaped pieces of assorted sizes within the range of one-half to 10 millimeters are heat treated to produce microcrystallinity in which the crystalline phases, such as for example stuffed beta quartz, beta-eucryptite, beta-spodumene solid solutions, and keatite and/or other phases, give the microcrystalline glass pieces exceptionally low coefficients of thermal expansion and other desirable properties. Compositions and heat treatment conditions are given to provide the insert pieces with the desired translucencies/opacities, colors, and shades, to match a range of those properties found in teeth.

Abstract: A powdery coating glass material essentially consists of V.sub.2 O.sub.5 5-35 wt. %, ZnO 33-60 wt. %, B.sub.2 O.sub.3 3-25 wt. %, SiO.sub.2 1-15 wt. %, Al.sub.2 O.sub.3 0-5 wt. %, and at least one element 2-20 wt. % selected from the group consisting of MgO, CaO, SrO, and BaO, which coating glass material has a softening point of 600.degree. C. or less. A coating glass composition is prepared by the above powdery coating glass material or a coating glass paste for use in a thick-film technique which contains the above powdery coating glass material. The prepared coating glass composition has a thermal expansion coefficient ranging from 55.times.10.sup.-7 /.degree.C. to 75.times.10.sup.-7 /.degree.C.

Abstract: A green optical filter phosphate-based glass having a high near infrared, absorption at about 650 nm to 950 nm and a transmission peak transmission at 550 nm to 560 nm and with the steepest slope of the absorption curve occurring between about 570 nm to 650 nm. The glass composition comprising, in mol %: 50 to 60% P.sub.2 O.sub.5, O to 5% SiO.sub.2, 20 to 33% Li.sub.2 O, 0 to 25% Na.sub.2 O, 1 to 25% K.sub.2 O, 0 to 5% for each of CaO, Bao, SrO and MgO, 7 to 10% Al.sub.2 O.sub.3, 3 to 6% CuO, 0.5 to 1.6% Cr.sub.2 O.sub.3, 0.5 to 2.0% Ho.sub.2 O.sub.3, 0.5 to 2.0 Dy.sub.2 O.sub.3 and 0 to 2.0% Er.sub.2 O.sub.3.

Abstract: A low- or no-silica phosphate glass useful as a high average power laser medium and having a high thermal conductivity, K.sub.90.degree. C. >0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-300.degree. C. <90.times.10.sup.-7 /.degree.C., consisting essentially of (on a batch composition basis):______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 0-14 Na.sub.2 O 0-12 K.sub.2 O 0-6 Al.sub.2 O.sub.3 9-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 6-30 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 .SIGMA. MgO + Li.sub.2 O 20-30 ______________________________________whereby said glass has K.sub.90.degree. C. >0.8 W/mK and .alpha..sub.20.degree.-300.degree. C. <90.times.10.sup.-7 /.degree.C. The Nd.sub.2 O.sub.3 can be replaced by other lasing species.

Abstract: The present invention is directed to the preparation of glass-ceramic articles exhibiting an apparent annealing point of at least 1200.degree. C. and containing slawsonite crystallization consisting essentially, in weight percent, of 10-54% SrO, 10-40% Al.sub.2 O.sub.3, 36-55% SiO.sub.2, and up to 25% total of at least one alkaline earth metal oxide in the indicated proportion of 0-10% MgO, 0-15% CaO, and 0-20% BaO.

Abstract: Fluorine-free titanium white enamel frits for enamelling steel consisting essentially of:35 to 45 parts by weight of the sum of SiO.sub.2 and ZrO.sub.2,18 to 22 parts by weight of TiO.sub.2,18 to 22 parts by weight of the sum of B.sub.2 O.sub.3 and Al.sub.2 O.sub.3,15 to 18 parts by weight of alkali metal oxides,2.5 to 4.5 parts by weight of P.sub.2 O.sub.5, and0.8 to 1.4 parts by weight alkaline earth metal oxides;with the proviso that the ratio of atomic numbers is as follows:(A+2B) to C is 0.9.+-.0.05,(lithium+0.5 magnesium) to phosphorous is 1.+-.0.1, and sodium to potassium is 1.2 to 2.6,wherein A is the sum of monovalent atoms, B is the sum of divalent atoms and C is the sum of trivalent atoms.

Abstract: The optical glass of the present invention comprising SiO.sub.2, alkali metal oxides, P.sub.2 O.sub.5 and Nb.sub.2 O.sub.5 has optical properties of 1.70 or more in refractive index nd and 30 or less in Abbe's number .nu.d and is superior in devitrification resistance and stability.

Abstract: A method of producing bioactive ceramics containing apatite crystal useful for artificial tooth roots or artificial bones, which comprises the steps of(i) reacting (A) at least one type of silicic acid ester such as tetramethoxysilane or tetraethoxysilane; (B) at least one type of phosphorus compound represented by general formula (II), (III), or (V): ##STR1## (where each of R.sub.5 to R.sub.9 is hydrogen, an alkyl group, with 1 to 5 carbon atoms, a phenyl radical, or an aralkyl group with 7 to 10 carbon atoms in which at least one of R.sub.10 to R.sub.12 is hydrogen, and m: 0 type 10); and (C) at least one water soluble calcium salt, the reaction being carried out in the presence of water at at pH of not higher than 8 to prepare a gel; and(ii) sintering the resulting gel to obtain the bioactive ceramics containing not less than 5 wt% of apatite and not more than 2wt% of Na compound as NA.sub.2 O.

Abstract: An amorphous material for the conduction of protons on a base of potassium hydrodisilicate contains oxometallates, bi- and trivalent metal ions and an excess of silicon dioxide and is suitable for use in fuel cells.

Abstract: Dielectric ink, paste and tape compositions having controlled thermal expansion contain a mixture of glasses wherein at least one glass has a coefficient of thermal expansion (CTE) below the CTE of the substrate to which the dielectric composition is applied and at least one glass has a CTE above the CTE of said substrate. The dielectric compositions significantly reduce or eliminate warpage of the substrate.

Abstract: The invention is directed to a thick film thermistor composition consisting of finely divided particles of (a) a ruthenium-based pyrochlore, and (b) a short borosilicate glass or glass mixture, both dispersed in (c) an organic medium.

Abstract: An oxynitride glass, a process for preparing same and a fiber thereof, in the glass which has Si--M.sub.1 --M.sub.2 --O--N system and contains SiO.sub.2, Si.sub.3 N.sub.4 and M.sub.1 O in amounts which, as mole %, satisfy the following equations (a) and (b):(SiO.sub.2 +3Si.sub.3 N.sub.4 +M.sub.1 O) X 100 / (100+2Si.sub.3 N.sub.4)=65 to less than 100 (a)(SiO.sub.2 +3Si.sub.3 N.sub.4)/M.sub.1 O=0.7 to 2.3 (b)wherein M.sub.1 is Ca, or Ca and Mg; M.sub.2 is at least one of the metal selected from the group consisting of Al, Sr, La, Ba, Y, Ti, Zr, Ce, Na, K, Sb, B, Cr, Pb, V and Sn, said glass containing 0-40 mole% SiO.sub.2, 26-70 mole % CaO, 0-20 mole % MgO, and over O to not more than 22 at % M.sub.2.

Abstract: A superconductive material with a superconducting critical temperature of at least 77.degree. K. comprising 20 at. % Nb, 10 at. % Si, 10 at. % Al and 60 at. % O is provided by simultaneous vapor-phase physical deposition or sputtering of Nb, Si and Al onto a heated sapphire substrate under oxygen-containing atmosphere, followed by a rapid quenching or post-oxidization of Nb-Si-Al ternary system composition having an Nb/Si/Al atomic ratio of 2/1/1. The high critical temperature allows abundantly existing, cheap available liquid nitrogen to be used as a cryogen for developing superconductivity.

Abstract: This invention presents a series of glasses which possess low softening points, high resistance to recrystallization and good durability in the presence of moisture. The glasses are contained within oxides of silver, vanadium, tellurium, and lead and have glass transition temperatures below 260.degree. C., and are useful in electronic applications such as die attach adhesives and sealing glasses.

Abstract: This invention relates to glasses consisting essentially, by weight, of about 35-72% Ln.sub.2 O.sub.3, 5-37% Al.sub.2 O.sub.3, 29-56% SiO.sub.2, and 4-7.5% N. Up to about one-half of the Ln.sub.2 O.sub.3 on an atomic basis may be replaced with SrO and/or BaO. A transparent glass can be formed which contains about 40-60% on a molar basis of Ln.sub.2 O.sub.3 +SrO and/or BaO and wherein the atomic ratio Sr and/or Ba:Sr and/or Ba+Ln >0.4.

Abstract: A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K.sub.90.degree. C. >0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., consists essentially of (on a batch composition basis):______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 15-35 Na.sub.2 O 0-10 Al.sub.2 O.sub.3 10-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 ______________________________________the amounts of Li.sub.2 O and Na.sub.2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K.sub.90.degree. C. >0.8 W/mK and .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., and wherein, when the batch composition is melted in contact with a silica-containing surface, the final glass composition contains at most about 3.

Abstract: The invention is directed to a thick film thermistor composition consisting of finely divided particles of (a) a ruthenium-based pyrochlore, and (b) a short borosilicate glass or glass mixture, both dispersed in (c) an organic medium.

Abstract: A fluoroaluminosilicate glass powder for dental glass ionomer cements has a specific gravity of 2.4 to 3.5 and a mean particle size of 0.02 to 10 .mu.m, contains in its components 20 to 50% by weight of SiO.sub.2, 20 to 40% by weight of Al.sub.2 O.sub.3, 15 to 40% by weight of SrO, 1 to 20% by weight of F.sub.2 and 0 to 15% by weight of P.sub.2 O.sub.5 on the converted oxide basis, and is substantially free from alkali metal ions such as Li, Na, K, Rb and Cs ions, and Be, Mg (and Ca) and Ba ions of alkali earth metal ions. For further improvements in physical properties, 100 parts by weight of the glass powder are surface-treated with 0.01 to 5 parts by weight of an acid and/or a fluoride.

Abstract: A process for preparing a glass or glass-ceramic composite sintered body by a sol-gel method comprises reacting(A) at least one silicic acid ester represented by the general formula (I). ##STR1## wherein R.sub.1 to R.sub.4 are each hydrogen or a group represented by Chd xH.sub.2x+1 (OC.sub.2 H.sub.4).sub.y - wherein x is 1 to 5, and y is 0 to 10, provided that R.sub.1 to R.sub.4 are not all hydrogen at the same time, and n is 0 to 20;(B) at least one phosphorus compound represented by the general formula (II), (III) or (IV): ##STR2## wherein R.sub.5 to R.sub.9 are each hydrogen, an alkyl group having 1 to 5 carbon atoms, a phenyl group or an aralkyl group having 7 to 10 carbon atoms, and m is 0 to 10; and(C) at least one compound selected from the group consisiting of calcium salts and calcium coumpounds represented by the general formula (V)Ca(OR.sub.10).sub.2 (V)wherein R.sub.

Abstract: A fibre-reinforced ceramic material is made by making a melt of glass of specified composition, cooling the melt rapidly enough for it to solidify as a glass, crushing the glass to a particle size not exceeding 70 .mu.m but preferably not exceeding 50 .mu.m mixing the powder with reinforcing fibres and heat-treating the mixture, preferably under pressure. The glass composition is: 100 parts by weight of base glass (0-30 CaO, 0-30 MgO, 5-35 Al.sub.2 O.sub.3, and 35-75 SiO.sub.2) plus 1/2-3 parts Cr.sub.2 O.sub.3 plus 1/2-10 parts of Fe.sub.2 O.sub.3 or the equivalent.This ensures the ceramic contains both surface-nucleated and internally-nucleated crystals, enhancing its properties.

Abstract: Improved copper conductor inks useful in fabricating multilevel circuits are provided. The inks comprise copper powder, a devitrifying glass frit which does not begin to flow until the furnace temperature is above about 700.degree. C., and a suitable organic vehicle. Devitrifying glass frits with these properties include a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-zirconium-phosphosilicate glass frit and mixtures thereof. The inks are advantageous in that they form copper conductor layers having excellent properties without the inclusion of traditional flux materials such as bismuth oxide.

Abstract: This invention is directed to the production of glass-ceramic articles exhibiting an apparent annealing point in excess of 400.degree. C. and excellent resistance to moisture attack, the articles consisting essentially, in mole percent, of:______________________________________ Li.sub.2 O 5-25 ZnO 35-50 Na.sub.2 O 0-15 Al.sub.2 O.sub.3 0.75-6 K.sub.2 O 0-10 P.sub.2 O.sub.5 29-37. Li.sub.2 O + Na.sub.2 O + K.sub.

Abstract: This invention is directed to the preparation of two groups of glass-ceramic materials exhibiting properties rendering them especially suitable as substrates for integrated circuit packaging. The first group of materials contains gehlenite, anorthite, and akermanite as the predominant crystal phases and consists essentially, in weight percent of 1-7.25% MgO, 22-40% CaO, 18-36% Al.sub.2 O.sub.3, and 29-42% SiO.sub.2. The second group of materials contains gehlenite, anorthite, and hardystoneite as the predominant crystal phases and consists essentially, in weight percent, of 2-13% ZnO, 22-37.5% CaO, 18-34% Al.sub.2 O.sub.3, and 28-42% SiO.sub.2.

Abstract: A transparent, semitransparent or opaline glass-ceramics containing calcium phosphate crystals uniform and very fine in grain size is obtained by heat-treating a glass essentially comosed of 38-52 wt % of SiO.sub.2, 4-16 wt % of P.sub.2 O.sub.5, 6-18 wt % of Al.sub.2 O.sub.3 (may partly be replaced by La.sub.2 O.sub.3), 20-33 wt % of CaO (may partly be replaced by MgO, BaO,SrO and/or ZnO), 4-17 wt % of ZrO.sub.2 (may partly be replaced by TiO.sub.2) and 0-0.5 wt % of alkali metal oxide(s), wherein the molar ratio of P hd 2O.sub.5 to ZrO.sub.2 is not greater than 3:1, at a temperature above the transition temperature and below the softening temperature of the glass. This glass-ceramics is excellent in refractoriness, electrical insulation resistance, chemical resistance and mechanical strength and has a relatively high coefficient of thermal expansion.

Abstract: A silicophosphate laser glass having a composition comprising, in % by mole,45 to 70% P.sub.2 O.sub.5 ;5 to 20% SiO.sub.2 ;60 to 95% P.sub.2 O.sub.5 +SiO.sub.2 +Al.sub.2 O.sub.5 ;10%<Al.sub.2 O.sub.3 .ltoreq.20%;20%<(Al.sub.2 O.sub.3 +SiO.sub.2).ltoreq.30%;4 to 30% Li.sub.2 O+Na.sub.2 O+K.sub.2 O;0.01 to 12% Nd.sub.2 O.sub.3 ;0 to 5% La.sub.2 O.sub.3 +Y.sub.2 O.sub.3 +B.sub.2 O.sub.5 ;0 to 10% R'O; and0 to 1% Nb.sub.2 O.sub.5 +CeO.sub.2,wherein R' is Mg, Ca, Sr, Ba, Zn or Pb. The silicophosphate laser glass can construct an excellent laser glass as an amplifying medium.

Abstract: Improved copper conductor inks useful in the fabrication of multilevel circuits are disclosed. The inks comprise copper powder, a devitrifying glass frit selected from a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit and mixtures thereof, an adhesion promoting oxide, and a suitable organic vehicle. These inks are particularly adapted for applications where superior adhesion between the copper conductor ink and underlying substrate or dielectric film is required.

Abstract: A ceramic composition for an electronic circuit board, a hybrid integrated circuit, an integrated circuit package or a multilayer ceramic structure, consisting essentially of at least one electrically insulating glass, at least one organic binder, at least one inorganic peroxide, and at least one material selected from the group which consists of: a metal selected from the platinum group; a compound of the platinum group; a manganese oxide; and a cobalt oxide.

Abstract: An improved copper via-fill ink for forming post-ups in a thick dielectric layer separating two patterned layers of copper conductor in a multilayer circuit assembly is provided. The via-fill ink comprises copper powder, a suitable organic vehicle and a glass frit consisting of a devitrifying glass and a vitreous glass. The devitrifying glass is a zinc-magnesium-barium-aluminum-zirconium-phosphosilicate glass and the vitreous glass is a barium-calcium-borosilicate glass.

Abstract: Improved copper conductor inks useful in fabricating multilevel circuits are provided. The inks comprise copper powder, a devitrifying glass frit which does not begin to flow until the furnace temperature is above about 700.degree. C., and a suitable organic vehicle. Devitrifying glass frits with these properties include a zinc-calcium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-silicate glass frit, a zinc-magnesium-barium-aluminum-zirconium-phosphosilicate glass frit and mixtures thereof. The inks are advantageous in that they form copper conductor layers having excellent properties without the inclusion of traditional flux materials such as bismuth oxide.

Abstract: Disclosed is a glass-ceramic product having a chemical composition, as expressed in terms of oxides with the exception of F, in the weight range of 35 to 60% SiO.sub.2, 10 to 20% Al.sub.2 O.sub.3, 12 to 25% MgO, 5 to 15% K.sub.2 O and 4 to 15% F, containing no B.sub.2 O.sub.3, and containing 40 to 70% by weight of fluorophlogopite microcrystals. This glass-ceramic product has a flexural strength of not less than 1500 kgf/cm.sup.2, a heat resistance of about 1100.degree. C., excellent dielectric properties and good machinability, and is a material capable of extending the range of use of high performance ceramics.

Abstract: A fluoroaluminosilicate glass powder for dental glass ionomer cement, a surface of which is treated with a fluoride in an amount of from 0.01 to 5 parts by weight based on 100 parts by weight of the glass powder, is disclosed. The fluoroaluminosilicate glass powder of the invention is improved in not only physical properties such as crushing strength but also mixing workability without impairing the inherent characteristics thereof for the dental use.

Abstract: A highly refractive optical glass (n.sub.d .gtoreq.1.83) with high dispersion (v.sub.d .ltoreq.25) and very good chemical stability at relatively low density (.delta..ltoreq.3.5 g/cm.sup.3) consists of (in weight percent) SiO.sub.2 19-25, Na.sub.2 O 7-10, K.sub.2 O 4-7, Cs.sub.2 O 0-12, Cao 0.5-2.0, BaO 9-15, TiO.sub.2 25-30, ZrO.sub.2 0-6, Nb.sub.2 O.sub.5 16-20, WO.sub.3 0-3, with Nb.sub.2 O.sub.5 :TiO.sub.2 =0.6-0.71.

Abstract: A partially devitrified porcelain enamel composition is formed by melting an oxide mixture in which 20-50 wt % BaO, 30-60 wt % SiO.sub.2, and 2-20 wt % TiO.sub.2 are present to form a homogeneous melt, quenching the melt to form a frit and firing the frit. The oxide mixture may optionally include K.sub.2 O, Na.sub.2 O, Li.sub.2 O, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, As.sub.2 O.sub.3, CaO, CeO.sub.2, MgO, F.sub.2, N.sub.2 O.sub.5, PbO, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3, SnO.sub.2, SrO, ZnO, ZrO.sub.2, and MoO.sub.3. Metal substrates coated with such a partially devitrified porcelain enamel composition are particularly suitable for the production of electronic circuits.

Abstract: A process for making a homogeneous melt for producing mineral wool insulation. This insulating material is made from waste products namely, bottom ash, cement kiln dust, slag, and waste from mineral wool production. These materials, along with a binder, are homogenized into a mixture. Thereafter, the process includes briquetting the mixture into agglomerated pieces. The agglomerates are then melted in a cupola furnace and the molten agglomerate is discharged into a receiver. Hot combustion gases are then passed into the melt or molten agglomerate to chemically homogenize the melt and heat the melt to preselected temperature. Thereafter, the melt is converted into fibers using conventional practices.

Abstract: This invention is directed to the production of glass-ceramic materials especially designed for substrates in integrated circuit packaging. The glass-ceramics can be prepared from thermally crystallizable glasses that can be sintered into an integral glass-ceramic having a dielectric constant less than 6 and containing willemite as the predominant crystal phase. The overall composition of the glass-ceramic consists essentially, in weight percent of 15-45% ZnO, 10-30% Al.sub.2 O.sub.3, and 30-55% SiO.sub.2. Where desired, a nucleating agent selected from the group consisting of 8-12% ZrO.sub.2 and 0.001-0.05% of a noble metal selected from the group consisting of Au, Pd, and Pt may be included.

Abstract: A composite glass ceramic material which comprises silicon nitride (Si.sub.3 N.sub.4) whiskers in a glass ceramic material comprising nitrogen doped cordierite, which composite material has greatly increased strength at elevated temperatures, good microwave transparency, and good thermal shock resistance.The invention further comprises a method for manufacturing the composite material by blending ground nitrogen doped cordierite glass with between about 5 and about 50 percent Si.sub.3 N.sub.4 whiskers by weight of glass. The blend is then formed into a desired shape and is sintered at an elevated temperature of from about 1000.degree. to 1400.degree. C.The invention also includes the novel nitrogen doped cordierite glass and glass ceramic made therefrom.

Abstract: Pressure and temperature insensitive optical fibers are produced using a Ta.sub.2 O.sub.5 based glass composition which has a high bulk modulus and a low thermal expansion coefficient. The glass composition can function as the cladding in the optical fiber or as a protective coating which surrounds the cladding thereby protecting the fiber from fluctuations in temperature and pressure.

Abstract: The invention relates to a photosensitive and heat-sensitive glass which is composed of 25-70 mol % of Al.sub.2 O.sub.3 and/or Ga.sub.2 O.sub.3, 30-75 mol % of at least one of CaO, BaO, SrO and MgO and 0-40 mol % of an auxiliary component which is at least one of SiO.sub.2, GeO.sub.2, B.sub.2 O.sub.3 and P.sub.2 O.sub.5. The glass is produced by melting a batch mixture of powdery raw materials. By exposure to UV rays the glass colors in yellowish brown, and the color does not fade by termination of the exposure. Bleaching of the colored glass is accomplished by heating for a short time at about 150.degree.-300.degree. C. Coloration and bleaching can be repeated without deterioration. The same glass turns into an opaline foam glass, which presents a very attractive appearance, by heat treatment at a temperature above the softening temperature. This change is irreversible. The foams created in the glass matrix are usually tens of microns in diameter.

Abstract: A phosphate glass ceramic which can be utilized especially as biomaterial in medicine and biology. The object of the invention is to provide a glass ceramic extensively adapted to bone, possessing adjustable biologically active characteristics. Another object of the invention is to produce a glass ceramic free of SiO.sub.2 or low in SiO.sub.2, of high P.sub.2 O.sub.5 and CaO content, possessing adjustable biologically active characteristics. The object is solved, whereby an initial glass of the composition having the mass percentages of Al.sub.2 O.sub.3 3-21, CaO 8-26, R.sub.2 O 10-25, P.sub.2 O.sub.5 43-58, is provided under the condition that R.sub.2 O can contain up to 25% of mass of Na.sub.2 O and up to 18% of mass of K.sub.2 O, and is thermally treated after melting, to provide the new phosphate glass ceramic. The main crystal phases are apatite and aluminiumorthophosphate. The phosphate glass ceramic can contain additions of SiO.sub.2, B.sub.2 O.sub.3, F.sup.-, MgO, FeO, Fe.sub.2 O.sub.3, TiO.sub.2.

Abstract: The invention relates to glasses formed from naturally occurring zeolites which are modified by inclusion of additional alumina.

Abstract: A casting composition for making dielectric green tapes comprising a dispersion of finely divided solids of (a) a noncrystallizable glass and (b) a mixture of refractory oxides in a solution of (c) organic polymer, which is readily depolymerizable at 825.degree.-1025.degree. C. in a nonoxidizing atmosphere, dissolved in (d) volatile nonaqueous solvent.

Abstract: A dielectric composition comprising an admixture of finely divided solids comprising (a) a noncrystallizable glass of which the deformation temperature (T.sub.d) is 580.degree.-625.degree. C. and the softening point (T.sub.s) is 630.degree.-700.degree. C., and (T.sub.s -T.sub.d) is 50.degree.-75.degree. C., and (b) a refractory which is substantially insoluble in the glass at temperatures of 825.degree.-900.degree. C.