Abstract:
The invention comprises a method of making self-supporting composite ceramic structures by the oxidation reaction of a body of molten parent metal precursor with a vapor-phase oxidant to form an oxidation reaction product. This reaction or growth is continued to form a thick, self-supporting ceramic body. The composite is recovered and in a separate subsequent operation, the surface is coated with one or more materials in order to effect desired changes in the properties of the surface, e.g., hardness, corrosion resistance.
Abstract:
Production of composite ceramic articles using a porous bed or preform of filler material (12) with a molten metal (11) in the presence of a vapor phase oxidant, for effecting infiltrating growth of a polycrystalline matrix of a metal-oxidant reaction product into the filler bed (12) or preform, wherein the filler material bed or preform has a first pore system of coarse interconnected pores, and a second pore system of finer interconnected pores defined by portions of the filler material which remain structurally stable in pore-defining arrangement during infiltration.
Abstract:
A method of producing a composite comprising a self-supporting polycrystalline material obtained by oxidation reaction of a molten parent metal (2) with a vapor-phase oxidant comprising infiltrating a filler (3) exhibiting inter-particle pore volume with a parent metal (2) under conditions which control the respective rates of said metal infiltration and said oxidation reaction.
Abstract:
The invention comprises a method of making self-supporting composite ceramic structures by the oxidation reaction of a body of molten parent metal precursor with a vapor-phase oxidant to form an oxidation reaction product. This reaction or growth is continued to form a thick, self-supporting ceramic body. The composite is recovered and in a separate subsequent operation, the surface is coated with one or more materials in order to effect desired changes in the properties of the surface, e.g., hardness, corrosion resistance.
Abstract:
A method of producing a composite comprising a self-supporting polycrystalline material obtained by oxidation reaction of a molten parent metal (2) with a vapor-phase oxidant comprising infiltrating a filler (3) exhibiting inter-particle pore volume with a parent metal (2) under conditions which control the respective rates of said metal infiltration and said oxidation reaction.