Abstract
The deformation behavior of porous amorphous Si-C-N ceramics derived from polyvinylsilazane has been investigated by compression tests at temperatures between 1500 and 1600°C in N 2 atmosphere. This material can be deformed to several % strain in this temperature range. During deformation, strain hardening is observed. Strain hardening suggests the occurrence of some structural change during deformation. The flow stress is less dependent on testing temperature. The apparent strain rate sensitivity index is about 0.3. The density of the material is increased by hot isostatic pressing at 1600°C with a high pressure of 1000MPa.
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