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| Thermal Shock Reliability for Ultra-high Temperature Ceramics with Stress Concentration on Surface |
| Received:November 10, 2019 Revised:March 16, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.08.019 |
| KeyWord:stress concentration ultra-high temperature ceramics reliability |
| Author | Institution |
| LIU Guo-qian |
Key Laboratory of Space Physics,Beijing , China |
| LIU Xiao-ming |
Research Institute of Aerospace Materials & Processing Technology, China Academy of Launch Vehicle Technology, Beijing , China |
| XU Xiao-liang |
Key Laboratory of Space Physics,Beijing , China |
| CHEN Wei-hua |
Key Laboratory of Space Physics,Beijing , China |
| YANChang-hai |
Key Laboratory of Space Physics,Beijing , China |
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| Abstract: |
| The work aims to investigate thermal shock reliability of ultra-high temperature ceramics with stress concentration on surface. The Weibull distribution and the reliability of ultra-high temperature ceramic materials with different notch radius were studied, and the evaluation method of reliability of ultra-high temperature ceramic materials under thermal shock load was established. For materials with incomplete notch sensitivity, the reliability of notched sample did not increase monotonously with the decrease of notch radius. For the three kinds of specimens with notch radius (r=0.1, 0.25, 0.5 mm), the survival rate of specimens with 0.1 mm notch radius was the lowest, and that of specimens with 0.25 mm notch radius was the highest. the survival rate of materials with notch on the surface in the initial stage of quenching decreased to 0 rapidly within 0.04 s, then maintained at 0 within 0.04~0.1 s and finally increased rapidly after 0.1 s and increased to 1 after 0.28 s. The established evaluation method can be used as an effective evaluation method for the application reliability of UHT ceramic materials, which is of great significance for the further application of UHT ceramic materials. |
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