RESEARCH AND DEVELOPMENT ON ADVANCED GRAPHITE MATERIALS. VOLUME XXIV. THE THERMAL EXPANSION OF GRAPHITE IN THE C$sub 0$-DIRECTION
The thermal expansions of lampblack base, coke base, hot worked coke base, and pyrolytic graphites were measured in the c/sub O/ direction from 1000 to 2700 deg K by use of a high temperature x-ray camera. The results indicate that, (a) the coefficient of thermal expansion is not constant with temperature and (b) this coefficient increases with increasing crystallite perfection. The camera was modified to accept a low temperature attachment and the a/sub o/'s and c/sub o/'s of lampblack base, hot worked coke base, and pyrolytic graphite were evaluated at 6, 78, and 298 deg K. The three graphites showed similar expansion characteristics and, within the limits of error, seemed to show a negative a/sub o/ expansion coefficient near 298 deg K. (auth)
- Research Organization:
- National Carbon Co. Research Lab., Parma, Ohio
- NSA Number:
- NSA-18-008803
- OSTI ID:
- 4096494
- Report Number(s):
- WADD-TR-61-72(Vol.XXIV)
- Country of Publication:
- United States
- Language:
- English
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