Claims
- 1. A process for the manufacture of carbonaceous articles having enhanced oxidation-resistance and erosion-resistance characteristics, comprising the steps of:
- (a) forming a carbonaceous article into a desired shape having a desired surface finish:
- (b) forming a layer of silicon carbide at the surface of the article; and
- (c) impregnating the silicon carbide-coated article with aluminum phosphate, the aluminum phosphate being distributed through the silicon carbide layer and into at least a portion of the carbonaceous article.
- 2. The process of claim 1, wherein the layer of silicon carbide is formed by a chemical vapor reaction technique.
- 3. The process of claim 1, wherein the surface layer of silicon carbide extends inwardly from the surface of the article to a depth within range of 0.035-0.045 inch.
- 4. The process of claim 1, wherein the impregnation with aluminum phosphate is carried out at room temperature and at a pressure of about 90 psig.
- 5. The process of claim 1, wherein the step of impregnating the article with aluminum phosphate includes:
- (a) drying the article to drive off volatiles;
- (b) applying a vacuum to the article to complete the elimination of volatiles;
- (c) immersing the article in a solution containing aluminum phosphate;
- (d) pressurizing the article;
- (e) draining excess solution from the article;
- (f) heating the article; and,
- (g) permitting the article to cool to room temperature.
- 6. The process of claim 5, wherein the step of drying includes drying the article for approximately eight hours at a temperature of about 105.degree. Centigrade.
- 7. The process of claim 5, wherein the step of applying a vacuum to the article includes placing the article under a vacuum of approximately 27-30 inches of water for a period of about three hours while maintaining room temperature.
- 8. The process of claim 5, wherein the step of pressurizing the article includes pressurizing the article to approximately 90 psig and maintaining that pressure for about three hours.
- 9. The process of claim 5, wherein the step of heating the article includes heating the article from room temperature to approximately 400.degree. Centigrade within a period of approximately eight hours at atmospheric pressure.
- 10. The process of claim 9, wherein the step of heating the article includes maintaining the article at approximately 400.degree. Centigrade for about three hours.
- 11. An article produced by the process according to either of claims 1 or 5.
CROSS REFERENCE TO RELATED APPLICATION
This is a divisional of application Ser. No. 368,700, filed Apr. 15, 1982.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1388539 |
Apr 1964 |
FRX |
Non-Patent Literature Citations (1)
Entry |
Bullock, R. E., 1980, Design of Coated Fuel Particles for a Hybrid Fusion-Fission System. |
Divisions (1)
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Number |
Date |
Country |
Parent |
368700 |
Apr 1982 |
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