系统地研究了不同温度下的热处理对 ＴｉＣp／Ａｌ２Ｏ３及 ＳｉＣW／Ａｌ２Ｏ３两种陶瓷复合材料表面裂纹及强度的影响．结果表明：在热处理温度为１０００～１４００℃时，两种材料表面压痕裂纹出现不同程度自愈合现象，材料的抗奇强度大幅度提高．裂纹愈合机理主要为扩散作用及材料表面的氧化反应．材料表面反应物层的微观形貌及热物理性能决定了材料抗弯强度的提高幅度．热处理引起的应力松弛也有利于材料强度的提高，但氧化过程中产生的表面气孔会引起材料强度的下降．
The effects of different-temperature-heat treatment on crack healing and strength of TiCP/Al2O3 and SiCW-Al2O3 composites were studied systematically. The results show that when the
samples are heat-treated at 1000～1400℃, crack healing will happen and the strength will be improved largely. The diffusion and the chemical reactions are the main mechanism. The
microstructure and thermal physical properties of the surface reactional layer determine the range of strength improvement. Stress relaxation is
benificial for strength, but the oxidation-induced bubbles weaken the specimens.
参考文献
| [1] | Zhang Yan Hui, Edwards Lyndon, et al. J. Am. Ceram. Soc., 1998, 81 (7): 1861--1868. [2] Irene A Chou, et al. J. Am. Ceram. Soc., 1998, 81 (5): 1203--1208. [3] Thompson A Mark, et al. J. Am. Ceram. Soc., 1995, 78 (3): 567--571. [4] Krishan L, Luthra, Hee Dong Park. J. Am. Ceram. Soc., 1990, 73 (4): 1014--1023. [5] Chin Chen Chiu. J of Mater. Sci., 1994, 29 (8): 2078--2082. [6] W.D.金格瑞, 等. 陶瓷导论. 北京: 中国建筑工业出版社, 1982. 600. |
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