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Abstract
The mechanical properties and the thermal-shock and thermal-fatigue characteristics of three reaction-sintered (density 1·9-2·6 g/ml) and one hot-pressed (density 3·00-3·18 g/ml) samples of silicon nitride showed significant differences according to composition and method of manufacture. The resistance to creep (at 1000-1200°C) and to thermal fatigue (at 1000°C), particularly of the dense grades, can be considerably superior to that of creep-resistant alloys. However, the appreciable variation in performance of all grades indicates that further development of the manufacturing technique is necessary to ensure consistent behaviour.
Notes
* Manuscript received 14 August 1961. Contribution to a Symposium on “Sintered High-Temperature Compounds” to be held in London on 8 December 1961.