Abstract: A process for producing a brazable ceramic composite by infiltrating silicon into a porous body at least partly composed of molybdenum to form at least about 5% by volume of a silicide of molybdenum in situ.

Abstract: A process for producing a composite by embedding a porous body at least partly composed of a substance which reacts with silicon in a powder mixture composed of silicon and hexagonal boron nitride powder, heating the resulting structure to a temperature at which the silicon is fluid and infiltrating the fluid silicon into the porous body.

Abstract: A process for producing a brazable ceramic composite by infiltrating silicon into a porous body at least partly composed of molybdenum to form at least about 5% by volume of a silicide of molybdenum in situ.

Abstract: Certain silicon-carbide shaped refractories can be obtained at molten silicon infiltration temperatures in a pollution-free manner by using an organic binder-free putty-like material of silicon powder, particulated carbon, including carbon fiber, and water, and optionally silicon carbide powder.

Abstract: A shaped confined structure composed of a mass of diamond and/or cubic boron nitride crystals coated with elemental non-diamond carbon in contact with a carbonaceous substrate is infiltrated by fluid silicon producing a like-shaped composite of a polycrystalline body phase integrallay bonded to a substrate supporting phase.

Abstract: A method is described for making a shaped silicon carbide-silicon matrix composite. A confined carbon fiber preform is infiltrated with sufficient molten silicon metal at a temperature in the range of from about 1400.degree. C. to about 1800.degree. C. in an inert atmosphere or vacuum. Silicon carbide powder can also be incorporated in the preform structure.

Abstract: A shaped confined structure composed of a mass of diamond and/or cubic boron nitride crystals coated with elemental non-diamond carbon in contact with a carbonaceous substrate is infiltrated by fluid silicon producing a like-shaped composite of a polycrystalline body phase integrally bonded to a substrate supporting phase.

Abstract: A shaped confined structure composed of a mass of diamond and/or cubic boron nitride crystals coated with elemental non-diamond carbon in contact with a supporting silicon carbide substrate is infiltrated by fluid silicon producing a like-shaped composite of a polycrystalline body component integrally bonded to the supporting silicon carbide substrate.

Abstract: A method is described for making a shaped silicon carbide-silicon matrix composite. A confined carbon fiber preform is infiltrated with sufficient molten silicon metal at a temperature in the range of from about 1400.degree. C. to about 1800.degree. C. in an inert atmosphere or vacuum. Silicon carbide powder can also be incorporated in the preform structure.

Abstract: Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved impact strength over the base refractory structure.

Abstract: A shaped confined mass of diamond and/or cubic boron nitride crystals coated with elemental non-diamond carbon, under a partial vacuum, is infiltrated by fluid silicon producing a like-shaped product wherein the crystals are bonded together by a medium comprised of silicon carbide and elemental silicon.

Abstract: Abradable materials useful as rotary sealant are provided and a method for making such materials. A mixture of silicon powder having a particular particle size range, carbon fiber and a binder is initially pressed to shape and thereafter heated in a mold to an elevated temperature to produce a shaped abradable mass.

Abstract: Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved strength over the base refractory structure.

Abstract: A method is described for making a shaped silicon carbide-silicon matrix composite. A confined carbon fiber preform is infiltrated with sufficient molten silicon metal at a temperature in the range of from about 1400.degree. C. to about 1800.degree. C. in an inert atmosphere or vacuum.

Abstract: Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved impact strength over the base refractory structure.

Abstract: A method is provided for making silicon-based ceramic composites having reduced tendency to form complex silicides when in contact with high performance metals or metallic alloys at elevated temperatures. The surface of the silicon-based ceramic composite, such as silicon carbide-silicon matrix composite, is etched, treated with an inorganic oxide mixture and fired. Improved performance is provided when the resulting composite is used in a specific application in contact with a high performance metal or metallic alloy, such as a gas turbine bucket.