Coated article and method for making same
Abstract
Abstract A METHOD OF COATING WITH PYROLYTIC CARBON TO PROVIDE A COATED ARTICLE HAVING HIGH STRENGTH CHARACTERISTICS. DEPOSITION OF PYROLYTIC CARBON IS EFFECTED ON AN ARTICLE FROM A CARBONACEOUS ATMOSPHERE AT A PRESELECTED TEMPERATURE UNDER CONDITIONS THAT RESULT IN FORMATION OF CARBON HAVING A PRESELECTED COEFFICIENT OF THERMAL EXPANSION WHICH IS LESS THAN THAT OF THE ARTICLE. DURING COOLING OF THE COATED ARTICLE TO AMBIENT TEMPERATURE, THE DIFFERENCE BETWEEN THE COEFFICIENTS OF THERMAL EXPANSION OF THE ARTICLE AND THE PYROLYTIC CARBON CAUSES THE PYTOLYTIC CARBON COATING TO BE PLACED UNDER, SUBSTANTIAL COMPRESSIVE TANGENTIAL STRESS. DEPOSITION IS USUALLY CARRIED OUT AT A TEMPERATURE OF ABOUT 1500*C. OR BELOW TO DEPOSIT FAIRLY DENSE ISOTROPIC OR LAMINAR CARBON. THE COEFFICIENT OF THERMAL EXPANSION OF THE ARTICLE BEING COATED IS USUALLY BETWEEN ABOUT 6 TO 9X10**-4/0C., WITH THE PREFERRED MATERIAL BEING GRAPHITE.
Inventors
- 👤 Jack C Bokros
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