Method for forming a self-supporting body using vapor-phase parent metals and solid oxidants

• US 5,277,933 A
• Filed: 12/23/1991
• Issued: 01/11/1994
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Lanxide Technology Company, LP
• Original Assignee: Lanxide Technology Company, LP
• Inventors: Ravi, Vilupanur A., Roach, Philip J., Claar, Terry D.
• Primary Examiner(s): KING, ROY V
• Application Number:
  US07/812,775
• Time in Patent Office: 750 Days
• Field of Search: 427/248.1, 427/249, 427/255.4, 427/215, 419/12, 419/14, 501/87, 501/94, 501/133, 501/134
• US Class Current: 427/248.1
• CPC Class Codes: C04B 35/652 Directional oxidation or solidification, e.g. Lanxide process
• CPC Class Codes: C04B 41/5053 non-oxide ceramics carbon or carbonisable materials C04B41/5001
• CPC Class Codes: C04B 41/5057 Carbides
• CPC Class Codes: C04B 41/87 Ceramics
• CPC Class Codes: C23C 10/08 only one element being diffused
• CPC Class Codes: C23C 10/16 more than one element being diffused in more than one step

Abstract

This invention relates generally to a novel directed metal oxidation process which is utilized to produce self-supporting bodies. In some of the more specific aspects of the invention, a parent metal (e.g., a parent metal vapor) is induced to react with at least one solid oxidant-containing material to result in the directed growth of a reaction product which is formed from a reaction between the parent metal and the solid oxidant-containing material. The inventive process can be utilized to form bodies having substantially homogeneous compositions, graded compositions, and macrocomposite bodies.

Claims

1. A method for forming a self-supporting body comprising:

providing at least one solid oxidant-containing material;

providing at least one vapor-phase parent metal,

heating said at least one vapor-phase parent metal and said at least one solid oxidant-containing material to substantially the same temperature;

contacting at least a portion of said solid oxidant-containing material with said at least one vapor-phase parent metal; and

permitting said at least one vapor-phase parent metal and said at least a portion of said solid oxidant-containing material to form at lest one reaction product on said at least a portion of said at least one solid oxidant-containing material.

2. The method of claim 1, wherein said at least one vapor-phase parent metal comprises at least one metal selected from the group consisting of titanium, zirconium, hafnium, silicon and niobium.

3. The method of claim 1, wherein said at least one solid oxidant-containing material comprises a carbonaceous material or a molybdenum-containing material.

4. The method of claim 1, wherein said at least one reaction product is formed primarily as a coating on at least one surface of said at least one solid oxidant-containing material.

5. The method of claim 1, wherein said at least one reaction product is formed as a coating on substantially all surfaces of said at least one solid oxidant-containing material.

6. The method of claim 1, wherein said at least one solid oxidant-containing material comprises a coating on at least one substrate material.

7. The method of claim 6, wherein said coating is present on at least one surface of said at least one substrate.

8. The method of claim 6, wherein said coating is located on substantially all surfaces of said at least one substrate.

9. The method of claim 1, wherein said at least one solid oxidant-containing material is substantially completely converted to said at least one reaction product.

10. The method of claim 1, wherein said at least one solid oxidant-containing material comprises a material having a complex geometry.

11. The method of claim 1, wherein said at least one solid oxidant-containing material comprises a carbon-carbon substrate.

12. The method of claim 1, wherein said at least one reaction product comprises at least one material selected from the group consisting of titanium carbide, zirconium carbide, hafnium carbide, niobium carbide and molybdenum disilicide.

13. The method of claim 1, wherein at least two vapor-phase parent metals are utilized.

14. A method for forming a self-supporting body comprising:

providing a reaction chamber;

placing at least one solid parent metal in at least a portion of said reaction chamber;

placing at least a portion of at least one solid oxidant-containing material in said reaction chamber;

heating said reaction chamber, said at least one parent metal, and said at least one solid oxidant containing material to a temperature so as to achieve an adequate vapor pressure of said parent metal within said reaction chamber, wherein said adequate vapor pressure of said parent metal comprises an amount of vapor parent metal so as to substantially completely surround said at least a portion of said at least one solid oxidant-containing material or substantially fill said reaction chamber;

maintaining said reaction chamber, said at least one parent metal, and said at least one solid oxidant-containing material at substantially the same temperature; and

permitting said at least one vapor-phase parent metal and said solid oxidant-containing material to form at least one reaction product on said at least a portion of said at least one solid oxidant-containing material.

15. The method of claim 14, wherein said at least one parent metal comprises at least one metal selected from the group consisting of titanium, zirconium, hafnium, silicon and niobium.

16. The method of claim 14, wherein said at least one solid oxidant-containing material comprises a carbonaceous material or a molybdenum-containing material.

17. The method of claim 14, wherein said at least one solid oxidant-containing material comprises a carbon-carbon substrate.

18. The method of claim 14, wherein said at least one reaction product comprises at least one material selected from the group consisting of titanium carbide, zirconium carbide, hafnium carbide, niobium carbide and molybdenum disilicide.

19. The method of claim 14, wherein at least two vapor-phase parent metals are utilized.

20. A method for forming a self-supporting body comprising:

providing a reaction system comprising (1) a reaction chamber;

(2) at least one solid oxidant-containing material, and (3) at least one vapor-phase parent metal source, wherein said at least one parent metal vapor-source and at least a portion of said at least one solid oxidant containing material are contained within said reaction chamber thereby forming a reaction system;

heating said reaction system to a temperature to achieve a vapor pressure of said vapor-phase parent metal to create a parent metal cloud within said reaction system, wherein said parent metal cloud substantially completely surrounds said at least a portion of said at least one solid oxidant-containing material;

maintaining said at least one vapor-phase parent metal source and said at least one solid oxidant-containing material at substantially the same temperature; and

permitting said parent metal cloud and said at least one solid oxidant-containing material to form at least one reaction product on said at least a portion of said at least one solid oxidant-containing material.