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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°C. to about 1800°C. in an inert atmosphere or vacuum. Silicon carbide powder can al

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°C. to about 1800°C. in an inert atmosphere or vacuum. Silicon carbide powder can also be incorporated in the preform structure.

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A method for making a silicon carbide-silicon matrix ceramic of the desired shape which comprises: (a) infiltrating molten silicon at a temperature of from 1400°C. to 1800°C. into a shaped carbon fiber part which further includes silicon carbide crystals dispersed therein while said part is substant

A method for making a silicon carbide-silicon matrix ceramic of the desired shape which comprises: (a) infiltrating molten silicon at a temperature of from 1400°C. to 1800°C. into a shaped carbon fiber part which further includes silicon carbide crystals dispersed therein while said part is substantially contained in a mold in a non-oxidizing atmosphere and under reduced pressure, and (b) separating the resulting silicon carbide ceramic from the mold where the fiber used in (a) has a specific gravity of from about 1.3 to 1.5.