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A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with

A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.

대표청구항 ▼

A process for producing a composite containing at least about 10% by volume of boron nitride coated fibrous material and having a porosity of less than about 20% by volume which comprises: (a) forming a slurry of infiltration-promoting material and organic binding material in a liquid medium; (b) de

A process for producing a composite containing at least about 10% by volume of boron nitride coated fibrous material and having a porosity of less than about 20% by volume which comprises: (a) forming a slurry of infiltration-promoting material and organic binding material in a liquid medium; (b) depositing a coating of boron nitride on fibrous material leaving no significant portion thereof exposed; (c) depositing a silicon-wettable coating on said boron nitride-coated fibrous material leaving no significant portion of said boron nitride exposed; (d) providing the resulting coated fibrous material substantially as a layer; (e) casting said slurry onto said coated fibrous material in an amount sufficient to form a tape therewith; (f) evaporating said liquid medium forming a tape; (g) firing said tape to remove said organic binding material producing a porous body; (h) providing an infiltrant comprised of boron and silicon containing elemental boron in solution in silicon in an amount of at least about 0.1% by weight of elemental silicon; (i) contacting said porous body with infiltrant associated infiltrating means whereby said infiltrant is infiltrated into said porous body; (j) heating the resulting assembly in a partial vacuum to a temperature at which said infiltrant is molten and infiltrating said molten infiltrant into said porous body to produce an infiltrated product; and (k) cooling said product producing said composite.