US4605542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing silicon carbide whisker
Assignee: Idemitsu Kosan Co Ltd
•
Filing: 1985-05-29
•
Granted: 1986-08-12
•
Expires: 2005-05-29
Abstract
Abstract Disclosed is a process for producing silicon carbide whisker by mixing a silicon source with carbon black and subjecting the resultant mixture to heating treatment in an inert atmosphere, which comprises using a silica recovered from geothermal hot water as said silicon source. The process of the present invention has the advantages of (1) being capable of producing SiC whiskers with slender diameters and small variance of lengths, and (2) contributing to effective utilization of resources by utilizing the silica recovered from geothermal hot water as the silicon source, etc. and its industrial value is great as the method for providing SiC whisker reinforcing material for various kinds of composite materials.
Inventors
- 👤 Junzo Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/36
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
The process for producing silicon carbide whiskers comprising mixing a silicon source with carbon black to form a reaction mixture and heating said reaction mixture in an inert atmosphere to form silicon carbide whiskers, said silicon source being silica recovered from geothermal hot water having a silica content of from 200 to 1000 ppm.
Claim 2
Dependent Claim
54 words
The process for producing silicon carbide whiskers comprising mixing a silicon source with carbon black to form a reaction mixture and heating said reaction mixture in an inert atmosphere to form silicon carbide whiskers, said silicon source being silica recovered from geothermal hot water having a silica content of from 200 to 1000 ppm.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein said recovered silica has a particle size of from 1 to 50 μm and a water content of from 1 to 50 wt. %.
Claim 4
Dependent Claim
29 words
The process of claim 1, wherein said recovered silica has a particle size of from 10 to 20 μm and a water content of 4 to 20 wt. %.
Claim 5
Dependent Claim
23 words
The process of claim 1, wherein said carbon black is selected from the group consisting of furnace black, acetylene black and lamp black.
Claim 6
Dependent Claim
12 words
The process of claim 1, wherein said carbon black is acetylene black.
Claim 7
Dependent Claim
28 words
The process of claim 1, wherein the ratio of recovered silica which is utilized as said silicon source to carbon black is the volume ratio of about 1:1.
Claim 8
Dependent Claim
13 words
The process of claim 1, wherein said inert atmosphere is argon or helium.
Claim 9
Dependent Claim
27 words
The process of claim 1, wherein said heating is at a temperature of from 1300° to 1800° C. for a time of from 1 to 4 hours.
Claim 10
Dependent Claim
27 words
The process of claim 1, wherein said heating is at a temperature of from 1400° to 1600° C. for a time of from 2 to 3 hours.
Claim 11
Dependent Claim
15 words
The process of claim 1, wherein said reaction mixture is heated in an electric furnace.
Claim 12
Dependent Claim
35 words
The process of claim 3, wherein said inert atmosphere is argon or helium and said heating is at a temperature of from 1300° to 1800° C. for a time of from 1 to 4 hours.
Claim 13
Dependent Claim
42 words
The process of claim 11, wherein said carbon black is selected from the group consisting of furnace black, acetylene black and lamp black and the mixture ratio of the recovered silica to carbon black is equal amounts in terms of volume ratio.
Claim 14
Dependent Claim
52 words
The process of claim 12, wherein said recovered silica has a particle size of from 10 to 20 μm and a water content of 4 to 20 wt. % and the heat treatment is conducted at a temperature of 1400° to 1600° C. for a treatment time of 2 to 3 hours.
Claim 15
Dependent Claim
18 words
The process for producing silicon carbide whisker according to claim 12, wherein said carbon black is acetylene black.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |