Mechanical behavior of a Sumitomo alumina fiber at room and high temperature
Conference
·
· Ceramic Engineering and Science Proceedings; (USA)
OSTI ID:6926070
The strength, fatigue, and creep characteristics of an organometallic polymer precursor-derived fiber was measured in the temperature range from room to 1200 C. The fiber had a nominal composition of 85 percent alumina and 15 percent silica. Batches of 25 specimens were tested in room temperature air with two different gage lengths and three different strain rates. The median strength of 10 cm-long specimens tested at 0.05/min strain rate was 1.5 GPa. Room temperature fatigue susceptibility was lower than that for typical polycrystalline aluminas, having a value for the fatigue constant N between 70 and 100. Strength was found to degrade with increasing temperature. At 1200 C the strength was 42 percent of the strength at room temperature. Substantial creep deformation occurred at temperatures above 1000 C. The stress exponent for creep ranged from about 1 to 2.4 depending on the temperature, and the average activation energy was 470 KJ/mole. 9 refs.
- OSTI ID:
- 6926070
- Report Number(s):
- CONF-890130--
- Conference Information:
- Journal Name: Ceramic Engineering and Science Proceedings; (USA) Journal Volume: 10
- Country of Publication:
- United States
- Language:
- English
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