Abstract: The purpose of the present invention is to provide a thermoelectric conversion element having a film which not only maintains sufficient adhesion even when exposed to a high temperature but also exhibits excellent oxidation resistance and crack resistance. The problem is solved by a thermoelectric conversion element including a thermoelectric conversion component, in which the thermoelectric conversion component contains magnesium silicide and/or manganese silicide and is covered with a film containing Si and Zr.

Abstract: An optical glass that is oxide glass, containing Si4+, B3+, La3+, Ti4+, Nb5+, and Zr4+; containing, denoted as cation %, Si4+ and B3+ of 5 to 55% in total, La3+ of 10 to 50%, with a total content of La3+, Gd3+, Y3+ and Yb3+?70%, and Ti4+, Nb5+, Ta5+ and W6+ of 22 to 55% in total, with a content of Ti4+?22%, wherein [Si4+/(Si4++B3+)]?0.40; the total content of La3+, Gd3+, Y3+, Yb3+, Zr4+, Ti4+, Nb5+, Ta5+, W6+ and Bi3+?65%; [Y3+/(La3++Gd3++Y3++Yb3+)]?0.12; [Ba2+/(La3++Gd3++Y3++Yb3+)]?0.40; [(Zr4++Ti4++Nb5++Ta5++W6+)/Zr4+]?2; (Ti4+/B3+)?0.85; and an Abbé number ?d is in a range from 23 to 35, and a refractive index nd satisfies nd?2.205?(0.0062×?d).

Abstract: A thin-layer encapsulation (1) for an optoelectronic component. The thin-layer encapsulation (1) comprises a sequence of layers (2) that comprises the following layers: a first ALD layer (3) deposited by means of atomic layer deposition, and a second ALD layer (4) deposited by means of atomic layer deposition. A method is disclosed for producing the thin-layer encapsulation and an optoelectronic component is disclosed having such a thin-layer encapsulation.

Abstract: The disclosure is directed to glass frits materials containing phosphors that can be used in LED lighting devices and for methods associated therewith for making the phosphor containing frit materials. Suitable non-lead glasses have a composition, in mol %, in the range of 20-24% K2O, 8-12% ZnO, 2-6% Al2O3, 35-41% B2O3 and 22-28 SiO2. Suitable leaded glasses have a composition, in wt %, in range of 72-79% PbO, 8-13% Al2O3, 8-13% B2O3, 2-5% SiO2 and 0-0.3% Sb2O3. Commercial high-lead glass can be used in practicing the disclosure. Among the unique advantages are the ability to blend two or more phosphors within the same frit layer which will yield a multi-phosphor-containing glass after firing; the ability to deposit the phosphor onto a substrate into a desired geometric pattern; and the fluorescing layer can be applied to the active plane, with the glass serving as protective substrate.

Abstract: The space glass has a composition, in wt. % based on oxide content, of: SiO2, 5-65; B2O3, 0-40; Al2O3, 0-12; PbO, 25-50; Na2O 0-8; K2O, 0-20; ? alkali metal oxides, at least 0.25; and at least 0.1 wt. % of a total amount of three or more doping agents selected from CeO2, MoO3, Bi2O3, WO3, Ag2O, SnO2, Sb2O3 and As2O3. In addition, it contains one or more of the following doping agents in the following amounts: at most 1 wt. %, CeO2; at most 0.02 wt. %, As2O3; at most 0.3 wt. %, Sb2O3; and at most 0.5 wt. %, SnO2. Light-weight optical systems for space are made from it, because of its high radiation resistance. A preferred process for making space glass includes melting the oxide starting ingredients at 1050° C. to 1200° C. to form a melt and refining the melt at 1230° C. to 1350° C.

Abstract: The space glasses have a composition, in wt. % based on oxide content, including SiO2, 12-45; B2O3, 0-4; Al2O3, 0-4; TiO2, 0-5; PbO, 50-82; Na2O, 0-4; K2O, 0-8; and at least 0.1 wt. % of a total amount of at least three doping agents selected from CeO2, MoO3, Bi2O3, WO3, Ag2O, SnO2, Sb2O3 and As2O3. Light-weight and space-saving optical systems for outer space applications can be made with these space glasses, which have high UV- and VIS-transmittance and high transmittance stability, because of their high radiation resistance based on their dopant content. A preferred process for making the space glass includes melting the above-stated oxide ingredients in a quartz crucible at 1050° C. to 1200° C. to form a melt and refining the melt at 1230° C. to 1350° C.

Abstract: Disclosed is a glass composition which is adapted to use in providing a hermetic seal between a metal and a ceramic, a metal and a metal, and a ceramic and a ceramic, to form crystallized glass having high strength and high thermal expansion which allow it to be used at high temperatures of 950° C. and over. The glass composition is substantially free of alkali metals, and contains, as calculated as oxide, 15-30 mass % of SiO2, 0-5 mass % of Al2O3, 20-35 mass % of B2O3, 10-25 mass % of CaO, 25-40 mass % of MgO, 3-8 mass % (3.0% excluded) of ZrO2, and 0-3 mass % of CeO2, wherein the crystallized glass which is formed by firing a glass powder made of the glass composition at a temperature of 850-1050° C. has a thermal expansion coefficient of 90-110×10?7/° C. at 50-550° C. and flexural strength of not less than 80 MPa.

Abstract: Provided is a radiation-shielding glass, including a glass composition in % by mass of 10 to 35% SiO2, 55 to 80% PbO, 0 to 10% B2O3, 0 to 10% Al2O3, 0 to 10% SrO, 0 to 10% BaO, 0 to 10% Na2O, and 0 to 10% K2O, in which the radiation-shielding glass has a total light transmission at a wavelength of 400 nm at a thickness of 10 mm of 50% or higher. Also provided is a radiation-shielding glass which has the similar glass composition and can be used for a gamma-ray shielding glass for a PET examination.

Abstract: An object of the present invention is to provide optical glass having improved glass-devitrification resistance and moldability without causing reduction in refractive index, and also provide an optical element using the optical glass as a raw material. Specifically, the present invention provides an optical glass containing components of, by mol %: B2O3: over 60% through 75%; Bi2O3: 24% to 39%; La2O3: 7% or lower; Gd2O3: 7% or lower; and ZrO2: 7% or lower.

Abstract: The optical glasses have increased refractive indices and are useful for making space-saving and light-weight imaging optics with lenses of different glass types for use in different objects travelling in space. The optical glasses are suitable for production of optics having low total weight, which is decisive for space applications. These space glasses have high UV- and VIS-transmittance in a range of between 300 and 800 nm and high stability of transmittance over a period of years, because their aging has been greatly limited.

Abstract: The optical glasses have increased refractive indices and are useful for making space-saving and light-weight imaging optics with lenses of different glass types for use in different objects travelling in space. The optical glasses are suitable for production of optics having low total weight, which is decisive for space applications. These space glasses have high UV- and VIS-transmittance in a range of between 300 and 800 nm and high stability of transmittance over a period of years, because their aging has been greatly limited.

Abstract: A glass composition of the present invention is oxide glass and has a composition that satisfies: 60 wt %<B2O3<78 wt %, 15 wt %<ZnO?24 wt %, 6 wt %?R2O?16 wt %, 1 wt %?MO<17 wt %, and 0 wt %?SiO2?10 wt %, where R denotes at least one selected from Li, Na, and K, and M indicates at least one selected from Mg, Ca, Sr, and Ba. A display panel of the present invention is formed using such a glass composition of the present invention.

Abstract: The present invention provides a blue-violet light blocking glass containing copper (I) halide fine particles that satisfactorily transmits light having a wavelength of 450 nm to 600 nm and sharply blocks light having a wavelength shorter than 450 nm. Specifically, the present invention provides a blue-violet light blocking glass containing a copper (I) halide and silver; for example, 20 to 85% by weight of SiO2; 2 to 75% by weight of B2O3; not more than 10% by weight of Al2O3; 2 to 30% by weight of at least one member selected from the group consisting of Li2O, Na2O, K2O, Rb2O and Cs2O; 1 to 15% by weight of at least one member selected from the group consisting of MgO, CaO, SrO, BaO and ZnO; not more than 10% by weight of at least one member selected from the group consisting of PbO, Nb2O5, ZrO2, La2O3, Y2O3, Ta2O3 and Gd2O3; not more than 5% by weight of at least one member selected from the group consisting of Sb2O3 and As2O3; not more than 5% by weight of SnO2; 0.

Abstract: The object of the present invention is to provide an optical glass which has optical constants such as a refractive index of from 1.45 to 1.65 and an Abbe number of at least 65 and which is yet excellent in chemical durability. A phosphate optical glass comprising, as glass components by mass %, from 73 to 85 of P2O5, from 14 to 26 of Al2O3, from 1 to 12 of K2O+Li2O, from 0 to 12 of SiO2, from 0 to 12 of B2O3, from 0 to 12 of Na2O, from 0 to 12 of Y2O3, from 0 to 12 of La2O3, from 0 to 12 of MgO+CaO+SrO+BaO, from 0 to 10 of ZrO2+TiO2+Gd2O3, from 0 to 10 of Ta2O5+GeO2+Ga2O3+Nb2O5+WO3+TeO2, from 0 to 2 of Sb2O3, and from 0 to 12 of ZnO+PbO.

Abstract: A glass for covering electrodes, which consists, as represented by mass percentage based on the following oxides, essentially of from 35 to 55% of PbO, from 15 to 30% of B2O3, from 4 to 15% of SiO2, from 20 to 44% of B2O3+SiO2, from 0.5 to 10% of TiO2+ZrO2+La2O3+Ta2O5, from 0 to 15% of Al2O3, from 0 to 25% of BaO, from 0 to 1% of CuO and from 0 to 1% of CeO2.

Abstract: The invention relates to uses of glasses and glass-ceramics in dental and orthodontic applications.

Abstract: A high-gain phosphate glass composition, which can be used to produce ultra-short gain length lasers and optical amplifiers is described wherein the composition of the glass in addition to exhibiting high gain for lasers and amplifiers, also exhibits high thermal shock resistance, high cross section, insignificant concentration quenching, and high solubility for rare earth ions and other properties which enable the material to be fabricated into a new class of ultra-short length micro-laser, fiber laser and amplifier configurations and designs.

Abstract: A glass comprising in mole percent based on oxide: SiO2 55-70 PbO 30-38 Na2O >0-4.5 K2O ?0-2.5 and essentially free of TiO2.

Abstract: Inorganic powder as a plasma display panel material comprises a powdery material containing glass powder. The powdery material has a moisture content adjusted to fall within a range between 0.1 and 2 mass %. The powdery material may include the glass powder alone or may further comprise ceramics powder in addition to the glass powder. The inorganic powder may be used as a paste or a green sheet.

Abstract: An optical glass includes SiO2; PbO; B2O3; not less than 0.1 mass % of TeO2; and not less than 0.4 mass % of Li2O.

Abstract: A CRT frit for use in sealing a panel and a funnel of a CRT bulb comprises non-crystallizing glass powder and refractory filler powder. The non-crystallizing glass powder consists essentially of, by weight percent, 75-90% PbO, 7-20% B2O3, 0-8% ZnO, 0-5% SiO2, and 0.1-8% Al2O3+Fe3O3. The mixing ratio of the non-crystallizing glass powder and the refractory filler powder is within a range between 95:5 and 55:45 in weight ratio. The coefficient of thermal expansion at a temperature between 30 and 250° C. is within a range between 80 and 90×10−7/° C.

Abstract: An optical glass includes SiO2; PbO; B2O3; not less than 0.1 mass % of TeO2; and not less than 0.4 mass % of Li2O.

Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.

Abstract: Coating and filler materials for localized thermal processing of glazed ceramics and other brittle and low thermal conductivity materials. The coating materials include oxide compositions that exhibit coefficients of thermal expansion which are less than about 8×10−6/° C. and glass transition temperatures which are less than about 400° C. The filler materials include particulate oxide materials which do not substantially react during localized thermal processing of glazed ceramics and other brittle and low thermal conductivity materials. The coating and filler materials are useable together as a composite material for repairing cavities having depths greater than about 2 mm.

Abstract: A low melting point glass for covering electrodes, which contains Cu in a content as calculated as CuO within a range of from 0.1 to 0.9% by mass percentage and which contains neither Mo or Sb.

Abstract: Inorganic powder as a plasma display panel material comprises a powdery material containing glass powder. The powdery material has a moisture content adjusted to fall within a range between 0.1 and 2 mass %. The powdery material may include the glass powder alone or may further comprise ceramics powder in addition to the glass powder. The inorganic powder may be used as a paste or a green sheet.

Abstract: A low melting point glass for covering electrodes, consisting, as represented by mass percentage based on the following oxides, essentially of: Mass percentage PbO 20 to 60%, Bi2O3  0 to 30%, B2O3 20 to 55%, SiO2  0 to 10%, Al2O3  0 to 15%, MgO + CaO  0 to 35%, SrO  0 to 35%, BaO  0 to 35%, ZnO  0 to 8%.

Abstract: The present invention relates to glasses of high refractive index having the following composition of oxides, expressed in percentages by weight: SiO2 29-35, B2O3 0.5-5, Li2O 0.5-3, Na2O 4-8, K2O 0-2, PbO 28-40, BaO 4-14, La2O3 4-12, TiO2 3-8, ZnO 0-8, ZrO2 0-4, Nb2O5 0-5, with: Li2O+Na2O+K2O 5.5-9; their use for the production of segments for multifocal corrective lenses; and multifocal corrective lenses incorporating at least one such segment in their structure.

Abstract: A primarily polycrystalline but partially amorphous electrical insulator can hermetically seal first and second spaced electrical terminals, one made from an anodized aluminum and the second made from a beryllium copper or Kovar or an alloy of beryllium, copper, nickel and gold. Nickel may be diffused into the beryllium copper and a noble metal may be deposited on the nickel. The insulator provides a flat meniscus to abut a corresponding electrical insulator in a cable. The insulator may provide an electrical impedance of approximately 50 ohms, an electrical resistivity greater than approximately 1018 ohms and a dielectric constant of approximately 6.3. The insulator operates satisfactorily in a frequency range to approximately 40 gigahertz.

Abstract: Provided are a glass such as a sealing glass which contains a rare earth element and crystalline particles, a structure made by sealing with said sealing glass, a magnetic head made by bonding using said sealing glass, and a magnetic recording and reproducing apparatus on which said magnetic heads are mounted. According to the glass of the present invention, magnetic heads, and other structures can be bonded at low temperatures and a high bond strength can be attained, and thus, magnetic heads having high-speed sliding properties and magnetic recording and reproducing apparatuses of high reliability can be obtained. The glass can be also used for heat resistant parts such as a pannel glass for a cathode-ray tube and the like.

Abstract: The invention concerns glasses characterized by the fact that they have a refractive index higher than 1.740; a dilatation coefficient .alpha., between 25 and 300.degree. C., between 65 and 70.times.10.sup.-7 /.degree.C.; and a Littleton point not exceeding 635.degree. C. but higher than 600.degree. C.; they have the following composition, expressed in weight percent of oxides:______________________________________ SiO.sub.2 23-32.0 Al.sub.2 O.sub.3 1.5-5.0 B.sub.2 O.sub.3 5-9.0 PbO 43-54.0 Li.sub.2 O 0-0.5 Na.sub.2 O 0-1.0 K.sub.2 O 0-1.0 with Li.sub.2 O + Na.sub.2 O + K.sub.2 O <1.0 BaO + SrO 4-9.0 TiO.sub.2 0-4.0 ZrO.sub.2 0-2.0 La.sub.2 O.sub.3 0-3.0 Nb.sub.2 O.sub.5 0-3.0 As.sub.2 O.sub.3 0-0.3 Sb.sub.2 O.sub.3 0-0.4 with ZrO.sub.2 + La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 1.5-4.0 ______________________________________Use for the production of segments to be used in the manufacture of multifocal lenses, particularly photochromic.

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: 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: A glass composition contains PbO of 67 to 74 weight %, SiO.sub.2 of 11 to 20 weight %, B.sub.2 O.sub.3 of 3 to 8 weight %, TeO.sub.2 of 3 9 weight %, Na.sub.2 O of 0 to 3 weight %, and ZrO.sub.2 of 1 weight % smaller (except 0). A magnetic head according to the present invention includes a gap forming material, a spacing filling material, a bonding material, or an insulating material for a magnetic head. The gap forming material, the spacing filling material, the bonding material, or the insulating material is made of a glass composition containing PbO of 67 to 74 weight %, SiO.sub.2 of 11 to 20 weight %, B.sub.2 O.sub.3 of 3 to 8 weight %, TeO.sub.2 of 3 to 9 weight %, Na.sub.2 O of 0 to 3 weight %, and ZrO.sub.2 of 1 weight % or smaller (except 0).

Abstract: A low temperature sealing composition comprising PbO--B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 glass powder with a reduced amount of SiO.sub.2 content but with an addition of GeO.sub.2 so as to realize a lowered sealing temperature such as 400.degree.-310.degree. C. The glass powder consists essentially of 25-85 wt. % of PbO, 1-11.2 wt. % of B.sub.2 O.sub.3, 5.1-70 wt. % of Bi.sub.2 O.sub.3, 0.1-20 wt. % of GeO.sub.2, 0-5 wt. % of SiO.sub.2, 0-10 wt. % of Fe.sub.2 O.sub.3, 0-10 wt. % of CuO, 0-15 wt. % of ZnO, 0-5 wt. % of TiO.sub.2, and 0-9 wt. % of F.sub.2. The glass powder may be used by mixing with 15-55 vol. % of refractory filler powder of at least one element which is selected from the group consisting of lead titanate based ceramic powder, willemite based ceramic powder, cordierite ceramic powder, zircon based ceramic powder, tin oxide solid solution powder, and alumina powder.

Abstract: The present invention relates to low temperature sealing glass compositions using ceramic composite filler useful for sealing alumina ceramic package, in particular, to compositions for hermetic-sealing cap and base of alumina package which consists of a solid PbO-B.sub.2 O.sub.3 glass powder and a filler selected from zinc zirconium silicate composite or magnesium aluminum zirconium silicate composite as a low thermal expansion ceramic composite. The used composite filler composes of zircon and willemite crystal phase or zircon and cordierite crystal phase uniformly mixed on the filler and has the low thermal expansion coefficient of 20.degree..about.40.degree..times.10.sup.-7 /.degree.C.

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: A low temperature sealing composition consists essentially of 45.0 to 85.0 wt. % of PbO, 1.0 to 11.0 wt. % of B.sub.2 O.sub.3, 1.0 to 45.0 wt. % of Bi.sub.2 O.sub.3, 0.2 to 10.0 wt. % of Fe.sub.2 O.sub.3, 0 to 15.0 wt. % of ZnO, 0 to 5.0 wt. % of CuO, 0 to 5.0 wt. % of V.sub.2 O.sub.5, 0 to 3.0 wt. % of SnO.sub.2, 0 to 5.0 wt. % of SiO.sub.2 plus Al.sub.2 O.sub.3, 0 to 7.0 wt. % of BaO, 0 to 5.0 wt. % of TiO.sub.2, 0 to 5.0 wt. % of ZrO.sub.2 and 0 to 6.0 wt. % of F.sub.2. The sealing composition has a low sealing temperature of 400.degree.C. or lower and is useful for readily sealing IC packages and display panels without application of load. In order to adjust the thermal coefficient of expansion, the sealing glass composition may be used by mixing with 20 vol. % to 55 vol. % of refractory filler powder of such as lead titanate based ceramics, willemite based ceramics, cordierite ceramics, zircon based ceramics or tin oxide based ceramics.

Abstract: This invention is directed to a method for preparing glass sheet having surfaces which are essentially defect-free and equivalent in smoothness to polished glass surfaces which comprises the steps of: Two different batches of alkali-metal-free batches are melted and formed into a laminated sheet and the first glass is enclosed by the second glass. The second glass is 1000 times more soluble than the first glass. The laminate is contacted with an acid to dissolve the second glass wherein the first glass remains with essentially defect free surfaces.

Abstract: For the production of a composite glass powder of any particle size from a fine particle size, multi-component mixture of a low-melting glass powder, fillers, and additives, the fine particle size, multicomponent mixture is sintered for 10-60 minutes at a temperature at which the base glass has a viscosity of 10.sup.5 to 10.sup.6.5 dPas, and the resultant sintered cake is ground to a powder of the desired particle size. If the multicomponent mixture comprises components decomposable with the release of gas, e.g., copper carbonate, the latter are decomposed prior to sintering at a temperature below the sintering temperature. The resultant composite glass powder containing copper oxide can be used for coating varistors.

Abstract: A low temperature sealing glass composition suitable for sealing integrated circuit alumina packages at temperatures below 400.degree. C. in a short time of about ten minutes. This sealing glass composition is a mixture of a glass powder and 1 to 50% (by weight) of one or more low expansion ceramic powders. The glass powder comprises a lead borate or lead zinc borate glass and the joint addition of Cu.sub.2 O, Tl.sub.2 O and F in a range of 6.3 to 20% (by weight) wherein the molar ratio of Cu to Tl to F is in the range between 0.8 Cu: 0.8 Tl: 0.8 F to 1.2 Cu: 1.2 Tl: 1.2 F. The glass in powder form is blended with one or more compatible low expansion ceramic powders including cordierite, zircon, willemite, lead titanate or modified tin oxide.

Abstract: Silicon-containing carbide fibers having high strength and modulus of elasticity, and polymer compositions for production thereof. These fibrers are inexpensive and very useful as reinforcing fibers for composite materials comprising plastics, carbon, metals, etc. as a matrix. These polymer compositions are also useful as a matrix of the above composite materials.

Abstract: A bonding glass for assembling a magnetic head by bonding a magnetic core to a non-magnetic ceramic slider. The magnetic core has a gap and an Fe-Al-Si film within the gap. The bonding glass includes SiO.sub.2 in the range of 6 to 11 wt %, B.sub.2 O.sub.3 in the range of 5 to 9 wt %, Al.sub.2 O.sub.3 in the range of 2 to 5 wt %, PbO in the range of 55 to 70 wt %, Bi.sub.2 O.sub.3 in the range of 5 to 15 wt %, TeO.sub.2 in the range of 1 to 10 wt % and CuO in the range of 0.5 to 2 wt %. A part of the PbO in PbO-SiO.sub.2 -B.sub.2 O.sub.3 -Al.sub.2 O.sub.3 glass is replaced with TeO.sub.2 and Bi.sub.2 O.sub.3 and, at the same time, CuO is added in order to prevent the formation of a heterophase. Glass color change under high temperature and high humidity is prevented.

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: The present invention relates to a moisture resistant low melting point glass composition for a magnetic head and a magnetic head utilizing it. Said glass composition may be composed of 28-35% PbO, 38-50% SiO.sub.2, 3-10% R.sub.2 O, 3-8% TeO.sub.2, and 1-5% TiO.sub.2 in terms of mole ratio, or 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, 8% or less TeO.sub.2 and 10% or less Bi.sub.2 O.sub.3, cr 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, and 0-8% TeO.sub.2, or 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, and 0-10% Bi.sub.2 O.sub.3.

Abstract: Black glass pastes for edging glass windows in automobiles comprise ground, lead-containing modified borosilicate glass which has sulfides or polysulfide fused therein, black ground pigment and a carrier medium which is liquid at room temperature or higher, is produced by fusing a mixture of lead-containing borosilicate glass, powdered carbon and metal sulfides an sulfur powder or the resulting frit together with black pigments to a particle fineness of less than 10 .mu.m and mixing the ground product with a carrier medium which is liquid at room temperature or elevated temperature, thereby forming a paste.

Abstract: A process for producing a curved glass plate, which comprises coating a crystallizable ceramic color composition to a predetermined portion of a glass plate, followed by baking at a temperature of from 500.degree. to 620.degree. C. to fuse the ceramic color composition to the glass plate, then crystallizing the fused ceramic color composition at a temperature of from 600.degree. to 700.degree. C., followed by bend-shaping by a pressing apparatus in a furnace.

Abstract: A magnetic head comprising magnetic core halves which are sealed with a sealing glass which consists essentially of 10 to 25% by weight of SiO.sub.2, 55 to 80% by weight of PbO, 1 to 15% by weight of CdO, 0 to 10% by weight of B.sub.2 O.sub.3, 0 to 5% by weight of ZnO, 0 to 5% by weight of Al.sub.2 O.sub.3, 0 to 5% by weight of Na.sub.2 O, and 0 to 10% by weight of K.sub.2 O, provided that a total content of Na.sub.2 O and K.sub.2 O does not exceed 10% by weight, has a coefficient of thermal expansion of from 90.times.10.sup.-7 /.degree. C. to 110.times.10.sup.-7 /.degree. C. in a temperature range between 30.degree. C. and 300.degree. C., a working temperature of 600.degree. C. or lower and water resistance of the second class or higher, which glass is not deeply colored and is not devitrified during the assembly of the magnetic head.

Abstract: An optical glass for a press lens composed of 25 to 41 mol % of SiO.sub.2, 10 to 30 mol % of B.sub.2 O.sub.3, 18 to 40 mol % of PbO, 1 to 10 mol % of Na.sub.2 O, 1 to 15 mol % of K.sub.2 O, 2 to 20 mol % of Li.sub.2 O, and 0.3 to 3 mol % of Al.sub.2 O.sub.3.

Abstract: This invention provides a composite article comprising mullite bubbles dispersed in one of a glass matrix and a glass-ceramic matrix, and a method of making the same. The composite ceramic article of the present invention is useful in applications requiring a material having a low dielectric constant, low dissipation factor, thermal expansion properties compatible with silicon, and good mechanical strength. The composite ceramic article of the present invention is particularly useful as a substrate for thick film circuits, housings for integrated circuit assemblies (i.e., covers), and materials such as gyrotron windows, that require transparency to microwaves or millimeter waves, in addition to acceptable power transmission efficiencies.