本文从烧结温度、基体晶粒大小、断裂方式、SiC在基体中的分布等几个方面研究了纳米SiC颗粒的加入对Al2O3微观结构的影响．用非均相沉淀工艺制备的纳米SiC-Al2O3复合粉体，具有Al2O3颗粒包裹纳米SiC的特点，提高了烧结温度，明显使Al2O3晶粒变小，并且抑制晶粒异常长大，试样的断裂方式从以沿晶断裂为主转变到以穿晶断裂为主．SiC在Al2O3中分布均匀，大部分位于晶粒内，少部分位于晶界上．这种微观结构有利于力学性能的提高．
The hot-pressing temperature, matrix grain size, fracture mode and the distribution of SiC were studied to reveal the effect of SiC inclusions on the microstructure
of Al2O3. Al2O3-SiC composite powder was perpared by the precipitation method. Nano SiC particales were coated with Al2O3. After hot pressing,
most of nano SiC particles were randomly located in Al2O3 grains. SiC inclusions raised the hot～pressing temperature, decreased Al2O3 grain
size, and inhibited the abnormal grain growth of Al2O3. The intergranular fracture for Al2O3 was transformed to the intragranular fracture for Al2O3-SiC
nanocomposites because of the addition of SiC. All those microstructure changes would benefit the improvement of the mechanical properities of Al2O3.
参考文献
| [1] | Niihara K. J. Ceram. Soc. Jpn., 1991, 99 (10): 974--982 2 Laura C S, Junhong J, Martin P H. J. Eur. Ceram. Soc., 1992, 10: 473--477 3 Byungkoog J, Manabu E, Teruo K. J. Ceram. Soc. Jpn., 1994, 102 (9): 863--867 4 王 宏 志， 高 濂?归 林 华，郭 景 坤(WANG Hong-Zhi et al). 无 机 材 料 学 报 (Journal of Inorganic Materials), 1997, 12 (5): 671--674 5 Laura C S, Marin P H. J. Amer. Ceram. Soc., 1996, 79 (12): 3013--3019 6 Laura C S, Martin PH. J. Amer. Ceram. Soc., 1996, 79 (12): 3020--3028 |
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