Effect of high temperature hydrogenation on the fracture strength of a sintered alpha silicon carbide
Technical Report
·
OSTI ID:6067943
The effect of high temperature hydrogenation on the strength of a pressureless sintered alpha silicon carbide was studied as a function of time. Samples were soaked in argon or a hydrogen-argon mixture (40:60, mole %) at 1400/sup 0/C for times of up to 50 hours. The samples were then broken in four point flexure at room temperature. It was found that the hydrogen attacked the material at grain boundaries, leaving loose SiC grains on the surface. Fifty hours in a hydrogenous atmosphere at 1400/sup 0/C caused an average 26% strength decrease. Surface degradation was evaluated using optical and scanning electron microscopy.
- Research Organization:
- Illinois Univ., Urbana (USA). Dept. of Ceramic Engineering
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6067943
- Report Number(s):
- DOE/ER/01198-T7; ON: DE85006813
- Country of Publication:
- United States
- Language:
- English
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