Claims
- 1. A method of preparing a ceramic material with increased ceramic yield, said method comprising heating a modified polycarbosilane in an inert atmosphere or in a vacuum to a temperature of at least 750.degree. C. until said modified polycarbosilane is converted to a ceramic material with increased ceramic yield relative to a non-modified polycarbosilane heated under the same conditions, wherein said modified polycarbosilane is prepared by mixing the non-modified polycarbosilane with an effective, ceramic yield increasing, amount of iron octoate, wherein the non-modified polycarbosilane is prepared by thermally decomposing and polycondensing a polysilane or polysilanes by heating said polysilane or polysilanes at a temperature of 300.degree.-2000.degree. C. in an inert gas, hydrogen, or vacuum wherein said polysilane or polysilanes are selected from the group consisting of cyclic polysilanes of the general formula
- (R.sup.1 R.sup.2 Si).sub.n
- and linear polysilanes of the general formula ##STR2## where n is greater than or equal to 4; where m is greater than or equal to 2; and where R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, phenyl, --Si(R.sup.5).sub.3 groups where R.sup.5 is an alkyl group containing 1 to 4 carbon atoms, and halogen atoms.
- 2. A method as claimed in claim 1 wherein said iron octoate is iron II octoate.
- 3. A method as claimed in claim 1 wherein said iron octoate is iron III octoate.
- 4. A method as defined in claim 2 wherein said non-modified polycarbosilane has a softening point of 50.degree. to 300.degree. C.
- 5. A method as defined in claim 3 wherein said non-modified polycarbosilane has a softening point of 50.degree. to 300.degree. C.
- 6. A method as claimed in claim 1 wherein said modified polycarbosilane contains from 0.1 to 2.0 weight percent iron.
- 7. A method as claimed in claim 2 wherein said modified polycarbosilane contains from 0.1 to 2.0 weight percent iron.
- 8. A method as claimed in claim 3 wherein said modified polycarbosilane contains from 0.1 to 2.0 weight percent iron.
- 9. A method as claimed in claim 4 wherein said modified polycarbosilane contains from 0.1 to 2.0 weight percent iron.
- 10. A method as claimed in claim 5 wherein said modified polycarbosilane contains from 0.1 to 2.0 weight percent iron.
- 11. A method as claimed in claim 1 wherein said cyclic polysilane is dodecamethycyclohexasilane and said linear polysilane is polydimethylsilane.
Parent Case Info
This is a continuation-in-part of U.S. application Ser. No. 868,207 filed May 23, 1986, now abandoned which is a continuation of U.S. application Ser. No. 678,122 filed Dec. 4, 1984, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
678122 |
Dec 1984 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
868207 |
May 1986 |
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