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Effect of grain size and orientation degree on thermal shock resistance of BN-matrix textured ceramics under cyclic thermal shock
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.jeurceramsoc.2021.09.007
Zhuo Tian 1, 2, 3 , Jianning Lu 1, 2, 3 , Xiaowei Feng 1, 2, 3 , Juan Wang 1, 2, 3
Affiliation  

Hexagonal boron nitride (h-BN) has a typical two-dimensional flake structure, so the anisotropy of h-BN grains caused by directional arrangement cannot be ignored when studying the thermal vibration resistance of materials under thermal cycling. In this paper, h-BN-matrix textured ceramics prepared with different holding time were selected, and the effects of thermal vibration temperature difference and thermal cycles on the phase and thermal vibration resistance of h-BN-matrix textured ceramics were studied. The results show that under the condition of high-frequency thermal cycling, the residual strength ratio (RSR) of BN-based textured ceramics is closely related to the holding time and showing obvious anisotropy. At the same time, there is a thermal vibration temperature range in which the internal stress will change from relief to re-accumulation.



中文翻译:

晶粒尺寸和取向度对循环热冲击下BN基织构陶瓷抗热震性的影响

六方氮化硼(h-BN)具有典型的二维片状结构,因此在研究热循环下材料的抗热振性时,不能忽略由定向排列引起的h-BN晶粒的各向异性。本文选取了不同保温时间制备的h-BN-基织构陶瓷,研究了热振温差和热循环对h-BN-基织构陶瓷的相和热振阻力的影响。结果表明,在高频热循环条件下,残余强度比(RSR)BN基织构陶瓷的温度与保温时间密切相关,表现出明显的各向异性。同时,还有一个热振动温度范围,在该温度范围内,内应力会从释放变为重新累积。

更新日期:2021-10-19
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