Claims
- 1. A method of preparing a coating of a silicious ceramic material on a substrate, which comprises:
- (a) providing a hydridosiloxane polymer containing one or more Si-H bonds per mer unit;
- (b) reacting said hydridosiloxane polymer with a hydroxyl-containing compound of the formula R'--OH, wherein R' is hydrogen, C.sub.1 -C.sub.10 alkyl, or aryl of 1-2 rings, and may be substituted with hydroxyl, lower alkyl, lower alkoxy, halogeno, silyl, or amino groups, or combinations thereof, in an inert atmosphere in the presence of a catalyst effective to activate Si--H bonds, to provide a ceramic precursor in which hydrogen atoms in the hydridosiloxane polymer have been replaced by OR' moieties;
- (c) coating a substrate with said ceramic precursor; and
- (d) pyrolyzing said ceramic precursor on said substrate at a temperature of at least about 500.degree. C. to provide a coating of said silicious ceramic material.
- 2. A method of preparing a coating of a silicious ceramic material on a substrate, which comprises:
- (a) providing a hydridosiloxane polymer containing one or more Si--H bonds per mer unit;
- (b) introducing carbon-containing moieties into said polymer by reaction with a compound containing an unsaturated carbon-carbon bond, in the presence of a catalyst effective to activate Si--H bonds, to give a ceramic precursor in which hydrogen atoms in the hydridosiloxane polymer have been replaced by carbon-containing moieties;
- (c) coating a substrate with said ceramic precursor; and
- (d) pyrolyzing said ceramic precursor on said substrate at a temperature of at least about 500.degree. C. to provide a coating of said silicious ceramic material.
- 3. A method of preparing a coating of a silicious, nitrogen-containing ceramic material on a substrate, which comprises:
- (a) providing a hydridosiloxane polymer containing one or more Si--H bonds per mer unit;
- (b) introducing nitrogen-containing moieties into said polymer by reaction with a compound NHR".sub.2 wherein the R" are independently selected from hydrogen, lower alkyl, sily, and aryl of 1-2 rings, in the presence of a catalyst effective to activate Si--H bonds, to give a ceramic precursor in which hydrogen atoms in the hydridosiloxane polymer have been replaced with nitrogen-containing moieties;
- (c) coating a substrate with said ceramic precursor; and
- (d) pyrolyzing said ceramic precursor on said substrate at a temperature of at least about 500.degree. C. to provide a coating of said silicious, nitrogen-containing ceramic material.
- 4. A method of preparing a coating of a silicious, metal-containing ceramic material on a substrate, which comprises:
- (a) providing a hydridosiloxane polymer containing one or more Si--H bonds per mer unit;
- (b) reacting said hydridosiloxane polymer with a compound selected from the group consisting of ML.sub.a and M--OH, wherein M is a metal atom, L is an organic ligand associated therewith, and a represents the molar ratio L--M in said complex, in the presence of a catalyst effective to activate Si--H bonds, to provide a ceramic precursor in which said activated Si--H bonds have been replaced by Si--M bonds;
- (c) coating a substrate with said ceramic precursor; and
- (d) pyrolyzing said ceramic precursor on said substrate at a temperature of at least about 500.degree. C. to provide a coating of said silicious, metal-containing ceramic material.
- 5. The method of claim 1, wherein said substrate is selected from the group consisting of metallic, glass, ceramic and graphite materials.
- 6. The method of claim 5, wherein said substrate is metallic.
- 7. The method of claim 5, wherein said substrate is glass.
- 8. The method of claim 5, wherein said substrate is ceramic.
- 9. The method of claim 5, wherein said substrate is graphite.
- 10. The method of claim 5, wherein said pyrolyzing is conducted at a heating rate between about 0.1.degree. C. and 10.0.degree. C. per minute.
- 11. The method of claim 5, wherein step (c) is carried out using flash pyrolysis.
- 12. The method of claim 2, wherein said substrate is selected from the group consisting of metallic, glass, ceramic and graphite materials.
- 13. The method of claim 12, wherein said substrate is metallic.
- 14. The method of claim 12, wherein said substrate is glass.
- 15. The method of claim 12, wherein said substrate is ceramic.
- 16. The method of claim 12, wherein said substrate is graphite.
- 17. The method of claim 12, wherein said pyrolyzing is conducted at a heating rate between about 0.120 C. and 10.0.degree. C. per minute.
- 18. The method of claim 12, wherein step (c) is carried out using flash pyrolysis.
- 19. The method of claim 3, wherein said substrate is selected from the group consisting of metallic, glass, ceramic and graphite materials.
- 20. The method of claim 19, wherein said substrate is metallic.
- 21. The method of claim 19, wherein said substrate is glass.
- 22. The method of claim 19, wherein said substrate is ceramic.
- 23. The method of claim 19, wherein said substrate is graphite.
- 24. The method of claim 19, wherein said pyrolyzing is conducted at a heating rate between about 0.1.degree. C. and 10.0.degree. C. per minute.
- 25. The method of claim 19, wherein step (c) is carried out using flash pyrolysis.
- 26. The method of claim 4, wherein said substrate is selected from the group consisting of metallic, glass, ceramic and graphite materials.
- 27. The method of claim 26, wherein said substrate is metallic.
- 28. The method of claim 26, wherein said substrate is glass.
- 29. The method of claim 26, wherein said substrate is ceramic.
- 30. The method of claim 26, wherein said substrate is graphite.
- 31. The method of claim 26, wherein said pyrolyzing is conducted at a heating rate between about 0.1.degree. C. and 10.0.degree. C. per minute.
- 32. The method of claim 26, wherein step (c) is carried out using flash pyrolysis.
Parent Case Info
This application is a continuation of application Ser. No. 341,722, filed Apr. 21, 1989, now U.S. Pat. No. 5,128,494, which is a continuation-in-part of Ser. No. 012,874, filed Dec. 1, 1986, now U.S. Pat. No. 5,008,422, which is a continuation-in-part of Ser. No. 908,685, filed Mar. 4, 1986, now U.S. Pat. No. 4,788,309, which is a continuation-in-part of Ser. No. 727,415, filed May, 26, 1985, now U.S. Pat. No. 4,612,383.
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Continuations (1)
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Number |
Date |
Country |
Parent |
341722 |
Apr 1989 |
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Continuation in Parts (3)
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Number |
Date |
Country |
Parent |
12874 |
Dec 1986 |
|
Parent |
908685 |
Mar 1986 |
|
Parent |
727415 |
Apr 1985 |
|