US4855119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing silicon carbide whisker
Assignee: Yazaki Corp
•
Filing: 1988-09-15
•
Granted: 1989-08-08
•
Expires: 2008-09-15
Abstract
Abstract A method for manufacturing a silicon carbide whisker comprising heating a reaction zone to a temperature in the range of 1,000 DEG C. to 1,200 DEG ; supplying a reducing or inactive gas and a sulfur-containing organic siloxane compound; thermally decomposing in vapor phase to react silicon and carbon contained in the sulfur-containing organic siloxane compound by a gaseous phase reaction and recovering a silicon carbide whisker, characterized in that the sulfur promotes the reaction between the silicon and the carbon.
Inventors
- 👤 Hajime Minamikata
- 👤 Toshiaki Kanno
- 👤 Masahiro Kanda
- 👤 Hitoshi Ushijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:16
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/36
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
103 words
A method of manufacturing a silicon carbide whisker, comprising the steps of: (a) heating a reaction zone to a temperature in the range of 1,100° C. to 1,500° C.: (b) supplying a carrier gas and reaction materials to said reaction zone, said carrier gas consisting of a reducing or inactive gas, and said reaction materials consisting of a sulfur-containing organic siloxane compound wherein said sulfur promotes the reaction between silicon and carbon; (c) thermally decomposing, in vapor phase, said reaction materials to react silicon and carbon contained in said reaction materials by a gaseous phase reaction; and (d) recovering a silicon carbide whisker.
Claim 2
Independent Claim
103 words
A method of manufacturing a silicon carbide whisker, comprising the steps of: (a) heating a reaction zone to a temperature in the range of 1,100° C. to 1,500° C.: (b) supplying a carrier gas and reaction materials to said reaction zone, said carrier gas consisting of a reducing or inactive gas, and said reaction materials consisting of a sulfur-containing organic siloxane compound wherein said sulfur promotes the reaction between silicon and carbon; (c) thermally decomposing, in vapor phase, said reaction materials to react silicon and carbon contained in said reaction materials by a gaseous phase reaction; and (d) recovering a silicon carbide whisker.
Claim 3
Dependent Claim
16 words
The method of manufacturing silicon carbide whisker of claim 1, wherein said carrier gas is hydrogen.
Claim 4
Dependent Claim
18 words
The method of manufacturing silicon carbide whisker of claim 1, wherein said carrier gas further contains hydrogen sulfide.
Claim 5
Dependent Claim
39 words
The method of manufacturing silicon carbide whisker of claim 1, wherein said sulfur-containing organic siloxane compound is a mercapto-modified silicon oil which contains dimethylsiloxane unit and mercaptopropylmethylsiloxane unit in the ratio of about 140 to 3 in one molecule.
Claim 6
Dependent Claim
17 words
The method of manufacturing silicon carbide whisker of claim 4, wherein said reaction materials further contains benzene.
Claim 7
Dependent Claim
18 words
The method of manufacturing silicon carbide whisker of claim 1, wherein said sulfur-containing organic siloxane compound is γ-mercaptopropyltrimethoxysilane.
Claim 8
Dependent Claim
28 words
A method according to claim 1, wherein said reaction material is supplied to the reaction zone at the rate of about 1 cubic centimeters per hour or more.
Claim 9
Dependent Claim
25 words
The method according to claim 1, wherein said siloxane compound is a polysiloxane taken from the group consisting of dimethyl polysiloxane and methyl phenyl polysiloxane.
Claim 10
Dependent Claim
14 words
The method according to claim 1 wherein said siloxane is a mercapto-modified silicon oil.
Claim 11
Dependent Claim
13 words
The method according to claim 9 wherein said mercapto-modified silicon oil comprises δ-mercaptopropyltrimethoxysilane.
Claim 12
Dependent Claim
26 words
The method according to claim 8 further including the step of adding a hydrocarbon compound selected from the group consisting of aliphatic, aromatic and sulfur-containing compounds.
Claim 13
Dependent Claim
23 words
The method according to claim 8 including the step of adding a gaseous hydrocarbon taken from the group consisting of methane and ethane.
Claim 14
Dependent Claim
23 words
The method according to claim 9 including the step of adding a gaseous hydrocarbon taken from the group consisting of methane and ethane.
Claim 15
Dependent Claim
23 words
The method according to claim 10 including the step of adding a gaseous hydrocarbon taken from the group consisting of methane and ethane.
References Cited (Backward Citations)
US4640830A
Cited
US4552740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |