Variations in CTE as a function of prestressing

✍ Scribed by I.William Gazda

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 433 KB
• Volume: 8
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(70)90013-8

✦ Synopsis

This investigation

was initiated to determine the effects of applying an initial compressive stress to a graphite material on the coefficient of thermal expansion, CTE. Three materials, representing fine, intermediate and coarse-grained commercial graphites, were chosen for the investigation.

The results indicate that significant increases in the 0-75°C CTE can result from prestressing a graphite body to 80 per cent or 90 per cent of failure. By successively annealing these prestressed specimens to 5007X, lOOO"C, 2000°C and 2800X, a gradual reduction in the CTE was attained. After the 2800°C anneal, the CTE of the material had returned to or was slightly lower than its original value before stressing.