Fibrous material-containing composite

• US 5,160,676 A
• Filed: 11/03/1989
• Issued: 11/03/1992
• Est. Priority Date: 12/14/1987
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Singh, Raj N., Gaddipati, Achuta R.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/437,155
• Time in Patent Office: 1,096 Days
• Field of Search: 501/88, 501/95, 264/60, 264/65, 156/89
• US Class Current: 156/89.26
• CPC Class Codes: C04B 35/634 Polymers C04B35/636 takes precedence
• CPC Class Codes: C04B 35/645 Pressure sintering
• CPC Class Codes: Y10S 428/902 High modulus filament or fiber
• CPC Class Codes: Y10T 428/24058 including grain, strips, or filamentary elements in respective layers or components in angular relation
• CPC Class Codes: Y10T 428/24132 including grain, strips, or filamentary elements in different layers or components parallel
• CPC Class Codes: Y10T 428/249929 Fibers are aligned substantially parallel
• CPC Class Codes: Y10T 428/2918 including free carbon or carbide or therewith [not as steel]
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

A composite is produced by admixing a matrix-forming material with organic binding material, forming the resulting mixture into a tape, disposing a layer of fibrous material between at least two of the tapes to form a layered structure, laminating the layered structure, heating the layered structure to remove organic binding material and hot pressing the resulting porous structure to form a composite containing a layer of fibrous material.

Claims

1. A process for making a composite containing fibrous material embedded in a ceramic matrix which comprises:

(a) forming a laminated structure comprising at least one layer of fibrous material disposed between layers of tape comprising a ceramic matrix material having a thermal expansion coefficient which is less than about 15% higher than that of the fibrous material and an organic binder material;

(b) heating the laminated structure to remove the organic binder material; and

(c) hot pressing the resulting laminated structure at a temperature and pressure to consolidate the structure into a composite having a porosity of less than about 5% by volume, at least about 10% by volume of the composite being fibrous material.

2. The process according to claim 1, wherein said fibrous material is selected from the group consisting of fibers, filaments, strands, bundles, whiskers, cloth, felt, and combinations thereof.

3. The process according to claim 1, wherein said fibrous material is comprised of a plurality of continuous filaments.

4. The process according to claim 1, wherein said fibrous material contains carbon.

5. The process of claim 1 wherein the fibrous material is selected from the group consisting of elemental carbon, silicon carbide, boron nitride, and silicon nitride.

6. The process according to claim 1, wherein said fibrous material is a silicon carbide-containing material containing at least about 50% by weight of silicon and at least about 25% by weight of carbon, based on the weight of said material.

7. The process according to claim 1, wherein said matrix-forming material is comprised of crystalline ceramic particulates.

8. The process according to claim 1, wherein said matrix-forming material is comprised of ceramic particulates and whiskers wherein said whiskers range up to about 30% by volume of said matrix-forming material.

9. The process according to claim 1, wherein said matrix has a thermal expansion coefficient ranging from lower than that of said fibrous material to about the same as that of said fibrous material.

10. The process according to claim 1, wherein a plurality of said layers of fibrous material is used in forming the layered structure and wherein all of said layers of fibrous material are separated from each other by said tape.

11. The process according to claim 1 wherein the matrix forming material is selected from the group consisting of zircon and mullite.

12. A process for making a comprising comprising a plurality of layers of fibrous material embedded in a ceramic matrix which comprises:

(a) forming layered structure of a plurality of tapes comprising a ceramic matrix material and an organic binder material wherein each layer of fibrous material is disposed between the faces of the tapes;

(b) heating the layered structure to remove the organic binder material; and

(c) hot pressing the resulting layered structure at a temperature and pressure to consolidate the structure to produce a composite having a porosity of less than about 5% by volume, the matrix having a thermal expansion coefficient which is less than about 15% higher than that of the fibrous material, and at least about 10% by volume of the composite being fibrous material.

13. The process according to claim 12, wherein said fibrous material is selected from the group consisting of fibers, filaments, strands, bundles, whiskers, cloth, felt, and combinations thereof.

14. The process according to claim 12, wherein said fibrous material is comprised of a plurality of continuous filaments.

15. The process according to claim 12, wherein said fibrous material contains carbon.

16. The process of claim 12 wherein the fibrous material is selected from the group consisting of elemental carbon, silicon carbide, boron nitride, and silicon nitride.

17. The process according to claim 12, wherein said fibrous material is a silicon carbide-containing material containing at least about 50% by weight of silicon and at least about 25% by weight of carbon, based on the weight of said material.

18. The process according to claim 12, wherein said matrix-forming material is comprised of crystalline ceramic particulates.

19. The process according to claim 12, wherein said matrix-forming material is comprised of ceramic particulates and whiskers wherein said whiskers range up to about 30% by volume of said matrix-forming material.

20. The process of claim 12 wherein the matrix material is selected from the group consisting of zircon and mullite.

21. The process according to claim 12, wherein each said layer of fibrous material is comprised of spaced filaments.

22. The process according to claim 12, wherein each said layer of fibrous material is comprised of a plurality of spaced continuous filaments which are substantially parallel to each other.