US5266533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black glass ceramic from rapid pyrolysis in oxygen-containing atmospheres
Assignee: Honeywell International Inc
•
Filing: 1992-04-02
•
Granted: 1993-11-30
•
Expires: 2012-04-02
Abstract
Abstract SiCxOy where x is greater than zero and up to about 2.0 and y is greater than zero and up to about 2.2 is produced from a cyclosiloxane polymer precursor by pyrolysis in the presence of oxygen by heating at a rate exceeding about 5° C/min.
Inventors
- 👤 Roger Y. Leung
- 👤 John G. Sikonia
- 👤 Stephen T. Gonczy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:32
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C10/00; C03C10/0009; C03C3/00; C03C3/04; C03C3/045; C03C2214/00; C03C2214/02; C03C2214/03; C03C2214/20
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
277 words
A process for producing an oxidation resistant black glass having the formula siCxOy where x is greater than zero and up to about 2.0 and y is greater than zero and up to about 2.2 wherein a black glass polymer precursor is pyrolyzed by heating in the presence of oxygen at a rate exceeding 5° C./min to a maximum temperature in the range of 800° C. to 1400° C. and wherein the black glass recursor is the pyrolyzed reaction product of a cyclosiloxane monomer having the formula ##STR3## where n is an integer from 3 to 30, R is hydrogen, and R' is an alkene of from 2 to 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon or (2) two or more different cyclosiloxane monomers having the formula of (1) where for at least one monomer R is hydrogen and R' is an alkyl group having from 1 to 20 carbon atoms and for the other monomers R is an alkene from 2 to 20 carbon atoms in which one vinyl carbon is directly bonded to silicon and R' is an allkyl group of from 1 to 20 carbon atoms, or (3) cyclosiloxane monomers having the formula of (1) where R and R' are independently selected from hydrogen, an alkene of from 2 to about 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon, or an alkyl group of from 1 to about 20 carbon atoms and at least some of said monomers contain each of said hydrogen, alkene, and alkyl moieties, said reaction taking place in the presence of an effective amount of hydrosilylation catalyst.
Claim 2
Dependent Claim
277 words
A process for producing an oxidation resistant black glass having the formula siCxOy where x is greater than zero and up to about 2.0 and y is greater than zero and up to about 2.2 wherein a black glass polymer precursor is pyrolyzed by heating in the presence of oxygen at a rate exceeding 5° C./min to a maximum temperature in the range of 800° C. to 1400° C. and wherein the black glass recursor is the pyrolyzed reaction product of a cyclosiloxane monomer having the formula ##STR3## where n is an integer from 3 to 30, R is hydrogen, and R' is an alkene of from 2 to 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon or (2) two or more different cyclosiloxane monomers having the formula of (1) where for at least one monomer R is hydrogen and R' is an alkyl group having from 1 to 20 carbon atoms and for the other monomers R is an alkene from 2 to 20 carbon atoms in which one vinyl carbon is directly bonded to silicon and R' is an allkyl group of from 1 to 20 carbon atoms, or (3) cyclosiloxane monomers having the formula of (1) where R and R' are independently selected from hydrogen, an alkene of from 2 to about 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon, or an alkyl group of from 1 to about 20 carbon atoms and at least some of said monomers contain each of said hydrogen, alkene, and alkyl moieties, said reaction taking place in the presence of an effective amount of hydrosilylation catalyst.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said black glass precursor is heated in the presence of air.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the heating rate is 50° C./min to 1000° C./min.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein the heating rate is greater than 100° C./min.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the heating is carried out by direct application of hot combustion gases.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the heating is carried out by radiant energy.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the carbon content is controlled by adjusting the heating rate.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the carbon content is controlled by adjusting access of oxygen to said polymer precursor during pyrolysis.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein the carbon content is controlled by adjusting the rate of gas flowing over said black glass precursor.
Claim 11
Dependent Claim
41 words
The process of claim 1 wherein the heating is carried out by a method selected from the group consisting of laser heating, RF induction heating, plasma heating, liquid and fluidized bed immersion, microwave heating, convective gas heating, and direct resistance heating.
Claim 12
Dependent Claim
268 words
An oxidation resistant black glass produced by pyrolysis of a black glass polymer precursor in the presence of oxygen by heating at a rate exceeding 5° C./min to a maximum temperature in the range of 800° C. to 1400° C., said black glass containing an increased carbon content relative to a black glass pyrolyzed at a heating rate below 5° C./min and wherein the black glass precursor is the reaction product of a cyclosiloxane monomer having the formula ##STR4## where n is an integer from 3 to 30, R is hydrogen, and R' is an alkene o from 2 to 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon or (2) two or more different cyclosiloxane monomers having the formula of (1) where for at least one monomer R is hydrogen and R' is an alkyl group having from 1 to 20 carbon atoms and for the other monomers R is an alkene from 2 to 20 carbon atoms in which one vinyl carbon is directly bonded to silicon and R' is an alkyl group of from 1 to 20 carbon atoms, or (3) cyclosiloxane monomers having the formula of (1) where R and R' are independently selected from hydrogen, an alkene of from 2 to about 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon, or an alkyl group of from 1 to about 20 carbon atoms and at least some of said monomers contain each of said hydrogen, alkene, and alkyl moieties, said reaction taking place in the presence of an effective amount of hydrosilylation catalyst.
Claim 13
Dependent Claim
268 words
An oxidation resistant black glass produced by pyrolysis of a black glass polymer precursor in the presence of oxygen by heating at a rate exceeding 5° C./min to a maximum temperature in the range of 800° C. to 1400° C., said black glass containing an increased carbon content relative to a black glass pyrolyzed at a heating rate below 5° C./min and wherein the black glass precursor is the reaction product of a cyclosiloxane monomer having the formula ##STR4## where n is an integer from 3 to 30, R is hydrogen, and R' is an alkene o from 2 to 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon or (2) two or more different cyclosiloxane monomers having the formula of (1) where for at least one monomer R is hydrogen and R' is an alkyl group having from 1 to 20 carbon atoms and for the other monomers R is an alkene from 2 to 20 carbon atoms in which one vinyl carbon is directly bonded to silicon and R' is an alkyl group of from 1 to 20 carbon atoms, or (3) cyclosiloxane monomers having the formula of (1) where R and R' are independently selected from hydrogen, an alkene of from 2 to about 20 carbon atoms in which one vinyl carbon atom is directly bonded to silicon, or an alkyl group of from 1 to about 20 carbon atoms and at least some of said monomers contain each of said hydrogen, alkene, and alkyl moieties, said reaction taking place in the presence of an effective amount of hydrosilylation catalyst.
Claim 14
Dependent Claim
18 words
The black glass of claim 11 wherein said black glass precursor is heated in the presence of air.
Claim 15
Dependent Claim
16 words
The black glass of claim 11 wherein the heating rate is 50° C./min to 1000° C./min.
Claim 16
Dependent Claim
15 words
The black glass of claim 13 wherein the heating rate is greater than 100° C./min.
Claim 17
Dependent Claim
24 words
The black glass of claim 11 wherein the carbon content is further controlled by adjusting access of oxygen to said polymer precursor during pyrolysis.
Claim 18
Dependent Claim
25 words
The black glass of claim 11 wherein the carbon content is further controlled by adjusting the rate of gas flowing over said black glass precursor.
Claim 19
Dependent Claim
42 words
The black glass of claim 11 wherein the heating is carried out by a method selected from the group consisting of laser heating, RF induction heating, plasma heating, liquid and fluidized bed immersion, microwave heating, convective gas heating, and direct resistance heating.
References Cited (Backward Citations)
USRE32107E
Cited
US5128494A
Cited
WO1990010596A1
Cited
WO1990012835A2
Cited
FR2647777A1
Cited
US5180694A
Cited
US4981820A
Cited
US5006142A
Cited
US5043002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |