摘要
sintering，微观结构，机械性质和氧化钇的低温度降级行为上的研究稳定四角形的氧化锆多晶体(3Y-TZP ) 被执行。结果证明 Al_2O_3 和 MgO 的增加在低温度改进 sintering，并且引起夸大的谷物生长和 tetragonal-ZrO_2 的转变 tomonoclinic-ZrO_2，与在机械性质的相应变化。theyttria 免费的单斜晶的氧化锆粒子的增加改变全面氧化钇分发并且导致韧化机制的活跃转变。而且，驱散的没有氧化钇的 ZrO_2 能禁止四角形的氧化锆转变，它对 3Y-TZP 陶艺的低温度降级行为的改进有益。
Studies on the sintering, microstructure, mechanical properties and low temperature degradation behavior of yttria stabilized-tetragonal zirconia polycrystal （3Y-TZP） were carried out. The results show that the addition of Al2O3 and MgO improve the sintering at low temperatures, and cause exaggerated grain growth and the transformation of tetragonaI-ZrO2 to monoclinic-ZrO2 with corresponding changes in the mechanical properties. The addition of the yttria-free monoclinic zirconia particles change the overall yttria distribution and induce an active transformation toughening mechanism. Furthermore, the dispersed yttria-free ZrO2 can inhibit the tetragonal zirconia transformation, which is beneficial to the improvement of the low temperature degradation behavior of 3Y- TZP ceramics.
基金
Supported by "863"High Technology Projects(No. 2002AA332080)
