초록 ▼

There is disclosed a method for producing a self-supporting ceramic body by oxidation of a molten precursor metal with a vapor-phase oxidant to form an oxidation reaction product and inducing a molten flux comprising said molten precursor metal through said oxidation reaction product. A second metal

There is disclosed a method for producing a self-supporting ceramic body by oxidation of a molten precursor metal with a vapor-phase oxidant to form an oxidation reaction product and inducing a molten flux comprising said molten precursor metal through said oxidation reaction product. A second metal is incorporated into said molten flux during the oxidation reaction. The resulting ceramic body includes sufficient second metal such that one or more properties of said ceramic body are at least partially affected by the presence and properties of said second metal in the metallic constituent.

대표청구항 ▼

A method for producing a ceramic body comprising infiltrating a permeable mass with an oxidation reaction product obtained by oxidation of a precursor metal comprising aluminum to form a polycrystalline material comprising (i) the oxidation reaction product of said precursor metal with a vapor-phase

A method for producing a ceramic body comprising infiltrating a permeable mass with an oxidation reaction product obtained by oxidation of a precursor metal comprising aluminum to form a polycrystalline material comprising (i) the oxidation reaction product of said precursor metal with a vapor-phase oxidant, and (ii) a metallic phase, said method comprising the steps of: (a) forming a permeable mass comprising a filler material and at least one second material selected from the group consisting of boron carbide and silicon nitride or a preform of filler material and at least one second material selected from the group consisting of boron carbide and silicon nitride; (b) orienting said permeable mass and a source of said precursor metal relative to each other so that formation of said oxidation reaction product of said precursor metal will occur into said permeable mass and towards said oxidant; (c) heating said source of precursor metal and said permeable mass in the presence of said oxidant to a temperature above the melting point of said precursor metal but below the melting point of said oxidation reaction product to form a body of molten precursor metal; (d) reacting said body of molten precursor metal with said oxidant at said temperature to permit said oxidation reaction product to form; (e) maintaining at least a portion of said oxidation reaction product in contact with and between said molten precursor metal and said oxidant at said temperature to progressively draw molten precursor metal through said oxidation reaction product towards said oxidant to permit fresh oxidation reaction product to continue to form at an interface between said oxidant and previously formed oxidation reaction product that has infiltrated said permeable mass, and reacting said molten precursor metal with said at least one second material in said permeable mass, thereby forming at least one reaction product; and (f) continuing step (e) at said temperature for a time sufficient to infiltrate at least a portion of said permeable mass with said polycrystalline material, thereby forming said ceramic body comprising (a) said oxidation reaction product; and (b) a metallic constituent comprising unreacted precursor metal and (c) at least one reaction product, wherein said at least one reaction product has a specific volume greater than the specific volume of said at least second material.