Corning Incorporated

John F MacDowell

Ronald L Andrus

Linda Ruth Pinckney

Francis W Martin

Louis M Holleran

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

Lithium aluminoborate glass-ceramics

An article of manufacture comprising protectively coated titanium, titanium alloy or titanium aluminide, and a method for making it, wherein the protective coating is an adherent crystalline alkaline earth silicate glass-ceramic coating having a composition consisting essentially, in weight percent on the oxide basis, of about 20-75% total of oxides selected in amounts not exceeding the indicated proportions from the group consisting of up to about 50% BaO, 55% SrO, and 35% CaO, 25-60% of SiO.sub.2 and, as optional constituents, 0-25% MnO, 0-20% MgO, and 0-30% total of other compatible bivalent and trivalent metal oxides. The coating is applied as a continuous glassy coating and is converted to a crystalline glass-ceramic coating by heat treatment.

Glass-ceramic coatings for titanium-based metal surfaces

This invention is directed to the formation of glass bonded ceramic composite articles, with particular emphasis on forming abrasive products such as grinding wheels. The glasses consist essentially, in weight percent of 15-35% CaO, 35-55% B.sub.2 O.sub.3, and 10-35% SiO.sub.2, with alumina comprising the preferred abrasive particles being bonded into an abrasive product.

Glass bonded ceramic composites

There is disclosed a coated article composed of a metal alloy substrate, the metal alloy having a nickel, chromium, cobalt or iron base, and a coating that serves as an oxygen barrier to insulate the metal surface from oxygen attack at temperatures which may range up to 1200.degree. C. The coating comprises a glass-ceramic selected from barium silicate and strontium silicate systems characterized by additives that enable forming a continuous well flowed glass coating prior to setting of the coating by crystallization. These additives include the refractory oxides Al.sub.2 O.sub.3, ZrO.sub.2 and Y.sub.2 O.sub.3, the transition metal oxides MnO, CoO, NiO and FeO, and MgO.

Coated metal article

For protection against oxidation or other adverse chemical deterioration, substrates such as carbon, intermetallic aluminides, and refractory metal alloys are provided with barrier coatings of an aluminoborate glass-ceramic coating having a composition, in weight percent, of about 10-55% Al.sub.2 O.sub.3, 4-40% B.sub.2 O.sub.3, up to 70% total of RO, wherein RO consists of one or more alkaline earth metal oxides selected in amounts not exceeding the indicated proportions from the group consisting of up to 70% BaO, up to 60% SrO, up to 40% CaO, and up to 25% MgO, up to 35% total of R.sub.2 O, wherein R.sub.2 O consists of one or more alkali metal oxides selected in amounts not exceeding the indicated proportion from the group consisting of up to 35% Na.sub.2 O, up to 30% K.sub.2 O, and up to 15% Li.sub.2 O, up to 25% total of metal oxides selected from the group consisting of ZnO and MnO, up to 30% of SiO.sub.2, and up to 10% F.

Coated refractory article and method

This invention is particularly directed to the production of glass-ceramics specifically designed for bonding hard refractory particulate ceramics into dense, mechanically strong composite bodies. The inventive glass-ceramics are crystallized in situ from divalent metal borate glasses. The invention is particularly drawn to composite articles where Al.sub.2 O.sub.3 particles comprise the hard refractory ceramic and the inventive glasses react therewith to form an exceptionally strong bond therebetween accompanied with the development of divalent metal aluminoborate crystals.

Glass-ceramic-bonded ceramic composites

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.

Slawsonite-containing glass-ceramics

This invention relates to the production of glass-ceramic materials particularly suitable for use as substrates in integrated circuit packaging. The inventive glass-ceramics can be prepared from thermally crystallizable glass capable of being concurrently sintered and crystallized in situ at temperatures between about 850.degree.-1000.degree. C. to bodies exhibiting dielectric constants less than about 6, linear coefficients of thermal expansion between about 12-60.times.10.sup.-7 /.degree.C. and containing cordierite solid solution as essentially the sole crystal phase. The glass-ceramics are essentially free from Li.sub.2 O and Na.sub.2 O and consist essentially, expressed in terms of weight percent on the oxide basis of 10-25% MgO+ZnO consisting of 2-18% MgO+0-21% ZnO, 20-38% Al.sub.2 O.sub.3, 40-52% SiO.sub.2, and 2-15% total of at least one oxide in the indicated proportion selected from the group consisting of up to 8% of an alkali metal oxide selected from the group consisting of K.sub.2 O, Rb.sub.2 O, and Cs.sub.2 O, up to 10% of a divalent metal oxide selected from the group consisting of CaO, SrO, BaO, and PbO, and up to 5% B.sub. 2 O.sub.3.

Glass-ceramics for electronic packaging

This invention is directed to the production of glass-ceramic bodies through the sintering of finely-divided glass powders into an integral body accompanied with the generation of crystals therein. The inventive products have compositions consisting essentially, selected from the group, in weight percent, consisting of:

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Penn Yan, NY, United States of America

John F MacDowell