通过在Y-TZP／Al2O3复相陶瓷材料中加入一定的添加剂，可以使其在较低的温度下进行液相烧结，使材料的烧结温度大幅度降低．由于液相的存在，氧化锆晶粒较细，而氧化铝晶粒可以借助液相发育成长柱状，这种形状的晶粒有利于陶瓷材料的力学性能，复相材料仍然保持较高的强度和断裂韧性．
The influence of additive on the sintering and microstructure of Y-TZP/Al2O3 composite was studied through adding some additives
in Y-TZP/Al2O3. The composite with 99% theorecital density can be obtained at 1350℃. The liquid phase formed at sintering
process existed around the ZrO2 and Al2O3 crystal grains. The small ZrO2 and large Al2O3 crystal grains can be found in the
microstructure of the composite. This was related to the solubility of ZrO2 and Al2O3 in silicate liquid phase. The ZrO2 had a low
solubility in silicate liquid phase and the growth of ZrO2 crystal grain was limited by liquid phase around it. Al2O3 had a high
solubility in the liquid phase, it formed a large and whisker-like crystal grain by solution-precipitation mechanism. The composite
also showed high mechanical properties. The flexure strength and fracture toughness were 640MPa and 7.2MPa·m1/2 respectively.
参考文献
| [1] | Bender B A, LewisII D, Cobleni W S, et al. Ceram. Eng. Sci. Proc., 1984, 5: 513--520 2 Lange F F. J. Mater. Sci., 1982, 17: 235-239 3 Lee H, Riehemann W, Mordire B L. J. Eur. Ceram. Soc., 1992, 10: 245--253 4 Rhodes W H. J. Am. Ceram. Soc., 1981, 64: 19--22 5 W. D. 金 格 瑞 等 著， 清 华 大 学 无 机 非 金 属 材 料 教 研 组 译. 陶 瓷 导 论. 北 京: 中 国 建 筑 工 业 出 版 社，1982. 496 |
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