Method of preparing coatings of metal carbides and the like
AssigneeSRI International
InventorRichard M. Laine
Life of this patent
Estimating the term…
Abstract
Coatings of metals, metal alloys, metal carbides, nitrides, borides, silicides and phosphides are provided. A precursor having organic ligands bonded to one or more metal atoms, such precursor having the element X also bonded directly or indirectly to the metal or metals, is pyrolyzed on a substrate surface to give a coating of M.sub.a X.sub.b. M represents a transition, lanthanide or actinide metal or tin, X represents C, N, B, Si, or P, and a and b represent the atomic proportions of M and X. The subscript b may be zero if an alloy or pure metal is to be prepared. The product M.sub.a X.sub.b can be prepared by relatively low temperature pyrolysis and the precursor can be used as a solution or a low melting solid.
Claims29
A method of applying a coating of a material M.sub.a X.sub.b to a surface of a solid substrate, wherein M represents one or more metals selected from the group consisting of transition metals, lanthanide metals, actinide metals and tin, X represents one or more elements selected from the group consisting of C, N, B, Si and P, and a and b represent the atomic proportions of M and X, where b is other than zero, wherein the method comprises:
- (a) providing a precursor to M.sub.a X.sub.b that is nonvolatile upon pyrolysis and which comprises an organometallic complex, said complex including one or more metal atoms M which may be the same or different, and wherein each of said metal atoms M is bound to an organic ligand, said organometallic complex further containing the element X either directly bound to one or more of said metal atoms M or contained within said ligands or both, and wherein said organometallic complex is substantially free of metal-oxygen or metal-halogen bonds;
- (b) either:
- (i) dissolving said precursor in a solvent to give a precursor solution;
- the solvent selected such that the precursor can be dissolved;
- or
- (ii) melting said precursor;
- (c) applying said precursor to the surface of the substrate to be coated;
- and
- (d) pyrolyzing said precursor-coated substrate at a temperature in the range of 500.degree. C. to 950.degree. C.
A method of applying a coating of a material M.sub.a X.sub.b to a surface of a solid substrate, wherein M represents one or more metals selected from the group consisting of transition metals, lanthanide metals, actinide metals and tin, X represents a metal other than M, and a and b represent the atomic proportions of M and X, where b is other than zero, wherein the method comprises:
- (a) providing a precursor to M.sub.a X.sub.b that is nonvolatile upon pyrolysis and which comprises an organometallic complex, said complex including one or more metal atoms M which may be the same or different, and wherein each of said metal atoms M is bound to an organic ligand, said oganometallic complex further containing the element X either directly bound to one or more of said metal atoms M or contained within said ligands or both, and wherein said organometallic complex is substantially free of metal-oxygen or metal-halogen bonds;
- (b) either:
- (i) dissolving said precursor in a solvent to give a precursor solution;
- the solvent selected such that the precursor can be dissolved;
- or
- (ii) melting said precursor;
- (c) applying said precursor to the surface of the substrate to be coated;
- and
- (d) pyrolyzing said precursor-coated substrate at a temperature in the range of 500.degree. C.
A method of applying a coating of a material M.sub.a X.sub.b to a surface of a solid substrate, wherein M represents one or more metals selected from the group consisting of transition metals, lanthanide metals, actinide metals and tin, X represents one or more elements selected from the group consisting of C, N, B, Si and P, and a and b represent the atomic proportions of M and X, where b is other than zero, wherein the method comprises:
- (a) providing a precursor to M.sub.a X.sub.b that is non-volatile upon pyrolysis and which comprises an organometallic complex, said complex including one or more metal atoms M which may be the same or different, and wherein each of said metal atoms M is bound to an organic ligand, said organometallic complex further containing the element X either directly bound to one or more of said metal atoms M or contained within said ligands or both, and wherein said organometallic complex is substantially free of metal-oxygen or metal-halogen bonds;
- (b) applying said precursor to the surface of the substrate to be coated;
- and
- (c) pyrolyzing said precursor-coated substrate at a temperature in the range of 500.degree. C. to 950.degree. C.
A method of applying a coating of a material M.sub.a X.sub.b to a surface of a solid substrate, wherein M represents one or more metals selected from the group consisting of transition metals, lanthanide metals, actinie metals and tin, X represents a metal other than M, and a and b represent the atomic proportions of M and X, where b is other than zero, wherein the method comprises:
- (a) providing a precursor to M.sub.a X.sub.b that is nonvolatileupon pyrolysis and which comprises an organometalliccomples, said complex including one or more metal atoms M which may be the same or different, and wherein each of said metal atoms M is bound to an organic ligand, said organomitallic complex further containing the element X either directly bound to one or more of said metal atoms M or contained within said ligands or both, and wherein said organometallic complex is substantially free of metaloxygen or metal-halogen bonds;
- (b) applying said precursor to the surface of the substrate to be coated;
- and
- (c) pyrolyzing said precursor-coated substrate at a temperature in the range of 500.degree. C.
Dependencies are inferred from the claim text.