Damage evolution due to thermal shock in a 2-D woven fiber-reinforced CVI SiC composite
- Univ. of Cincinnati, OH (United States)
A water quench technique was used to study the effects of thermal shock on a 2-D woven Nicalon{trademark} fiber-reinforced CVI SiC matrix composite. Thermal shock damage was characterized by optical microscopy as a function of quench temperature difference ({Delta}T) and number of quench cycles. The observed thermal shock damage consisted of small matrix cracks and fiber-matrix interfacial debonding on the surface and large interior cracks in the matrix that formed between and parallel to the fiber cloths. At low {Delta}T`s only small matrix cracks on the surface were observed and were linked to initial decreases in Young`s modulus. At higher {Delta}T`s larger cracks between the fiber cloths in the specimen interior were observed and linked to decreases in the ultimate flexural strength.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 567462
- Report Number(s):
- CONF-960106--
- Country of Publication:
- United States
- Language:
- English
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