US5079039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a ceramic matrix composite material having improved toughness
Assignee: Safran Aircraft Engines SAS
•
Filing: 1990-02-23
•
Granted: 1992-01-07
•
Expires: 2010-02-23
Abstract
Abstract A porous structure made of refractory fibers or densified by carrying out a sequential deposition of a matrix, the deposition comprising at least two chemical vapor infiltration phases of an essentially ceramic material separated by a chemical vapor infiltration of a less rigid material chosen among pyrolytic carbon and boron nitride.
Inventors
- 👤 Louis Heraud
- 👤 Roger Naslain
- 👤 J. Michel Quenisset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/515; C04B35/58; C04B35/583; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/003; C04B37/005; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/08; C04B2237/083; C04B2237/30; C04B2237/32; C04B2237/38; C04B2237/50; C04B2237/60; Y; Y10; Y10S; Y10S427/00; Y10S427/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A method for producing a ceramic matrix composite material having improved toughness, comprising the steps of: providing a porous reinforcement structure from refractory fibers: forming a ceramic layer by chemical vapor infiltration of an essentially ceramic material into the reinforcement structure; forming a less rigid layer over said ceramic layer by chemical vapor infiltration of a material selected from the group consisting of pyrolytic carbon and boron nitride; and alternating between said steps of forming said ceramic layer and forming said less rigid layer in a sequential reiterative manner, whereby the ceramic matrix composite material is formed.
Claim 2
Independent Claim
97 words
A method for producing a ceramic matrix composite material having improved toughness, comprising the steps of: providing a porous reinforcement structure from refractory fibers: forming a ceramic layer by chemical vapor infiltration of an essentially ceramic material into the reinforcement structure; forming a less rigid layer over said ceramic layer by chemical vapor infiltration of a material selected from the group consisting of pyrolytic carbon and boron nitride; and alternating between said steps of forming said ceramic layer and forming said less rigid layer in a sequential reiterative manner, whereby the ceramic matrix composite material is formed.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein in said step for forming said layer of less rigid material said less rigid material is laminar pyrolytic carbon.
Claim 4
Dependent Claim
29 words
The method of claim 1, wherein said layers formed by chemical vapor infiltration of an essentially ceramic material have a greater thickness than said layer of less rigid material.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein in said step of forming said less rigid layer the layer formed of less rigid material has a thickness not exceeding 2 microns.
Claim 6
Dependent Claim
23 words
The method of claim 1, wherein said chemical vapor infiltration in said layer forming steps is carried out by a pulsed type process.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein said refractory fibers in said step of providing a porous reinforcement structure are comprised of silicon carbide.
Claim 8
Independent Claim
120 words
A method for producing a ceramic matrix composite material having improved toughness, comprising the steps of: providing a deposition oven; placing a porous reinforcement structure comprised of refractory fibers into the deposition oven; depositing a layer of a ceramic, said ceramic comprising at least one material selected from the group consisting of carbon, silicon carbide, alumina, and zirconium, on said porous reinforcement structure by chemical vapor infiltration in said deposition oven; depositing by chemical vapor infiltration in said deposition oven on said ceramic a further layer comprised of material selected from the group consisting of pyrolytic carbon and boron nitride; and alternating between said deposition layering steps in a sequential reiterative manner, whereby the ceramic matrix composite material is formed.
Claim 9
Independent Claim
120 words
A method for producing a ceramic matrix composite material having improved toughness, comprising the steps of: providing a deposition oven; placing a porous reinforcement structure comprised of refractory fibers into the deposition oven; depositing a layer of a ceramic, said ceramic comprising at least one material selected from the group consisting of carbon, silicon carbide, alumina, and zirconium, on said porous reinforcement structure by chemical vapor infiltration in said deposition oven; depositing by chemical vapor infiltration in said deposition oven on said ceramic a further layer comprised of material selected from the group consisting of pyrolytic carbon and boron nitride; and alternating between said deposition layering steps in a sequential reiterative manner, whereby the ceramic matrix composite material is formed.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein the step of depositing the ceramic layer further comprises changing the heat and pressure in said oven.
Claim 11
Dependent Claim
36 words
The method of claim 7 wherein the step of depositing the layer comprised of material selected from the group consisting of pyrolytic carbon and boron nitride further includes changing the heat and pressure in said oven.
Claim 12
Dependent Claim
43 words
The method of claim 7 wherein both of said layer forming steps further comprise changing the heat and pressure in said oven, and further wherein said heat and pressure conditions associated with each of said layer forming steps are different from each other.
References Cited (Backward Citations)
EP0121797A2
Cited
US4766013A
Cited
US4752503A
Cited
US4580524A
Cited
US4724169A
Cited
US4735856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |