Abstract: A method of bonding a plurality of thermally stable high strength graphite fiber reinforced glass matrix composite pieces is described. The process comprises applying to the surfaces to be bonded at least one layer of a metal which is highly adherent to the composite and the solder and is oxidatively stable. A tie layer may be used between the composite bond surface and the metal layer to better bond the metal layer to the composite. Following application of the metal layer, the composite pieces are stacked with the metal layers facing each other and a solder layer in between. The temperature of the assembly is raised to melt the solder and form the bond. The melting temperature of the solder and the metal layers are chosen so as to be higher than the use temperature of the bonded composite. A bonded composite article thus formed is also described.

Abstract: A process of bonding a plurality of thermally stable, high strength graphite fiber reinforced glass matrix composite materials is described. The process comprises applying to the surface of at least one of the composite materials to be bonded, a mixture of low softening point glaze such as high lead oxide containing glaze, a high melting point low coefficient of thermal expansion material such as beta-spodumene and colloidal silica followed by hot pressing the composite materials to be bonded together. The resultant bonded articles and the glass compositions particularly adapted for this bonding process are also described.

Abstract: A process of bonding a plurality of thermally stable, high strength graphite fiber reinforced glass matrix composite materials is described. The process comprises applying to the surface of at least one of the composite materials to be bonded, a mixture of low softening point glaze such as high lead oxide containing glaze, a high melting point low coefficient of thermal expansion material such as beta-spodumene and colloidal silica followed by hot pressing the composite materials to be bonded together. The resultant bonded articles and the glass compositions particularly adapted for this bonding process are also described.

Abstract: A method of bonding a plurality of thermally stable high strength graphite fiber reinforced glass matrix composite pieces is described. The process comprises applying to the surfaces to be bonded at least one layer of a metal which is highly adherent to the composite and the solder and is oxidatively stable. A tie layer may be used between the composite bond surface and the metal layer to better bond the metal layer to the composite. Following application of the metal layer, the composite pieces are stacked with the metal layers facing each other and a solder layer in between. The temperature of the assembly is raised to melt the solder and form the bond. The melting temperature of the solder and the metal layers are chosen so as to be higher than the use temperature of the bonded composite. A bonded composite article thus formed is also described.

Abstract: A hot pressed, biaxially oriented, alumina fiber reinforced, ceramic composite having alternate layers of parallel running alumina fibers within a glass matrix such that the fibers of one layer are positioned at right angles to the fibers of any adjoining layer.

Abstract: Glass compositions having a Young's modulus of at least 16 million psi and a specific modulus of at least 110 million inches consisting essentially of approximately, by weight, 20-43% SiO.sub.2, 8-21% Al.sub.2 O.sub.3, 4-10% BeO, 27-58% of at least one oxide selected from a first group consisting of Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Ce.sub.2 O.sub.3 and the mixed rare earth oxides and 3-12% of at least one oxide selected from a second group consisting of MgO, ZrO.sub.2, ZnO and CaO, the molar ratio of BeO to the total content of said first group oxides being from 1.0-3.0.