US4976899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a composite material with matrix and reinforcing fibers of carbon
Assignee: Individual
•
Filing: 1989-05-11
•
Granted: 1990-12-11
•
Expires: 2009-05-11
Abstract
Abstract A process for the production of a composite material with matrix and reinforcing fibers of carbon. The process comprises: (a) forming a porous substrate (2) of carbon fibers; (b) covering the surface of each fiber wih a fine silicon carbide coating (6) by chemical vapor deposition; (c) shaping the substrate; (d) embedding the substrate in a carbon matrix (4) containing at most 20% by weight siliconcarbide; (e) covering the outer surface of the matrix with an outer silicon carbide covering (10) which contains cracks (12); and (f) filling the cracks in the outer covering with at least a borosilicate glass (16).
Inventors
- 👤 Gerard Rousseau
- 👤 Nicole Pastureau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C04B35/622; C04B35/626; C04B35/628; C04B35/62844; C04B35/62857; C04B35/6286; C04B35/62863; C04B35/62884; C04B35/62894; C04B35/62897; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/48; C04B2235/483; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/5252; C04B2235/70; C04B2235/74; C04B2235/77; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2918; Y10T428/292; Y10T428/2933; Y10T428/2938; Y10T428/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
140 words
A process for the production of a composite material having a substrate (2) of carbon fibers embedded in a matrix (4), characterized in that it comprises the following stages: (a) forming a deformable, porous substrate constituted with carbon fibers (2) and comprising pores, (b) covering the surface of each fiber (2) of the substrate with a fine silicon carbide coating (6) by chemical vapor deposition, so that the substrate retains its deformability, (c) shaping the substrate, (d) densifying the shaped substrate to form the matrix with a carbon material containing finely divided, amorphous silicon carbide and representing at the most 20% by weight of the matrix (4), (e) covering the outer surface of the matrix with an outer silicon carbide covering (10) comprising cracks (12), (f) filling the cracks of the outer covering with at least a borosilicate glass (16).
Claim 2
Dependent Claim
140 words
A process for the production of a composite material having a substrate (2) of carbon fibers embedded in a matrix (4), characterized in that it comprises the following stages: (a) forming a deformable, porous substrate constituted with carbon fibers (2) and comprising pores, (b) covering the surface of each fiber (2) of the substrate with a fine silicon carbide coating (6) by chemical vapor deposition, so that the substrate retains its deformability, (c) shaping the substrate, (d) densifying the shaped substrate to form the matrix with a carbon material containing finely divided, amorphous silicon carbide and representing at the most 20% by weight of the matrix (4), (e) covering the outer surface of the matrix with an outer silicon carbide covering (10) comprising cracks (12), (f) filling the cracks of the outer covering with at least a borosilicate glass (16).
Claim 3
Dependent Claim
23 words
Production process according to claim 1, characterized in that the densification consists of pyrolizing a carbon-containing polymer having functional groups with Si--O bonds.
Claim 4
Dependent Claim
25 words
The process according to claim 2, characterized in that the polymer is a phenolic resin to which have been grafted functional groups containing Si--O bonds.
Claim 5
Dependent Claim
23 words
The process according to claims 2 or 3, characterized in that said functional groups represent 6 to 15% by weight of the polymer.
Claim 6
Dependent Claim
33 words
The process according to claim 1, characterized in that the densification consists of thermally depositioning a mixture of hydrocarbon and organosilane, which may or may not be substituted by at least one halogen.
Claim 7
Dependent Claim
20 words
The process according to claim 5, characterized in that the organosilane constitutes 1 to 8% by weight of the mixture.
Claim 8
Dependent Claim
33 words
The process according to claim 1, characterized in that the SiC coating (6) is obtained by chemical vapor deposition of at least one organosilane, substituted or not substituted by at least one halogen.
Claim 9
Dependent Claim
51 words
The process according to claim 1, characterized in that the SiC coating (6) is obtained by chemical vapor deposition of a mixture containing at least one organosilane, substituted or not substituted by at least one halogen and at least one compound chosen from the group consisting of hydrogen and a hydrocarbon.
Claim 10
Dependent Claim
30 words
The process according to claim 1, characterized in that the pores (11) of the densified substrate are previously filled with silicon carbide deposited by chemical vapor deposition under infiltration conditions.
Claim 11
Dependent Claim
25 words
The process according to claim 1, characterized in that the outer covering (10) is obtained by silicidation of the outer surface of the densified structure.
Claim 12
Dependent Claim
23 words
The process according to claim 1, characterized in that cracks (12) of the outer covering (10) are also heated filled with silica (14).
Claim 13
Dependent Claim
28 words
The process according to claim 11, characterized in that the heating filling with silica (14) is carried out by impregnation using an alcoholic solution of a polysilicate (16).
Claim 14
Dependent Claim
32 words
The process according to claim 1, characterized in that the filling heating with borosilicate glass (16) takes place by impregnating the densified structure in a mixture of silicon alcogel and boron alcogel.
Claim 15
Dependent Claim
35 words
The process according to claim 1, characterized in that the surface of each fiber of the porous substrate is covered with a carbon coating (8), following the putting into place of the SiC coating (6).
Claim 16
Dependent Claim
26 words
The process according to claim 1, characterized in that the fibers are covered with a carbon coating (8) before putting into place the SiC coating (6).
Claim 17
Dependent Claim
26 words
The process according to claims 14 or 15, characterized in that the carbon coating (8) is formed by chemical vapor deposition of at least one hydrocarbon.
Claim 18
Dependent Claim
31 words
The process according to claim 1, wherein the outer covering (10) is obtained by chemical vapor deposition of at least one organosilane, substituted or not substituted by at least one halogen.
Claim 19
Dependent Claim
49 words
The process according to claim 1, wherein the outer covering (10) is obtained by chemical vapor deposition of a mixture containing at least one organosilane, substituted or not substituted by at least one halogen and at least one compound chosen in the group consisting in hydrogen and a hydrocarbon.
References Cited (Backward Citations)
US3095316A
Cited
US3406044A
Cited
US3991248A
Cited
US4397901A
Cited
US4373006A
Cited
US4476164A
Cited
US4425407A
Cited
US4476178A
Cited
US4487799A
Cited
US4613522A
Cited
US4766013A
Cited
US4668579A
Cited
US4795677A
Cited
US4661369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |