초록 ▼

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 machina

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.

대표청구항 ▼

Composites comprising, (A) a contiguous machinable exterior layer, and (B) a refractory base structure, where the contiguous machinable exterior layer (A) is the infiltration product of reaction by molten silicon, and a substantially uniform mixture comprising by volume, from 45% to 90% of particula

Composites comprising, (A) a contiguous machinable exterior layer, and (B) a refractory base structure, where the contiguous machinable exterior layer (A) is the infiltration product of reaction by molten silicon, and a substantially uniform mixture comprising by volume, from 45% to 90% of particulated carbon having up to an equal proportion by volume, based on the total volume of the mixture, of silicon carbide particles, and from 10% to 55% of a particulated inorganic material selected from the class consisting of boron nitride, aluminum oxide, magnesium oxide, and silicon nitride, substantially inert to molten silicon at temperatures up to 1600°C., having an average particle size of from 0.1 to 2000 microns, and a Mohs hardness value falling within the range of 1-7, and the refractory base structure (B) is a member selected from the class of shaped silicon carbide refractories and the infiltration product of reaction by molten silicon and a carbon fiber preform.