文档介绍：Al2O3-ZrO2(3Y)-SiC 纳米复合材料的制备及性能
王宏志高濂归林华郭景坤
摘要本文研究了非均相沉淀法制备 Al2O3-ZrO2(3Y)-SiC 复合粉体的工艺过程,认为粉体的煅烧温度是至关重要的,热压烧结得到了致密的 Al2O3-ZrO2(3Y)-SiC 纳米复合材料,ZrO2 的加入对烧结温度的影响不大. 通过 TEM 观察,SiC 颗粒均匀分散于材料中,大的 ZrO2 颗粒位于Al2O3 晶粒间,小的圆形 ZrO2 颗粒位于 Al2O3 晶粒内,一部分 Al2O3 晶粒呈非等轴状. 80wt%Al2O3-15wt%ZrO2-5wt%SiC 纳米复合材料的抗弯强度可达 555MPa,韧性为 .
关键词纳米复合材料,制备工艺,氧化铝,显微结构
分类号 TB 323
Processing and Properties of Al2O3-ZrO2(3Y)-SiC posites
WANG Hong-Zhi GAO Lian GUI Lin-Hua GUO Jing-Kun
( State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences hanghai 200050 China)
Abstract The Al2O3-ZrO2(3Y)-posite powders were made by the heterogeneous precipitation method. For getting dense sintered body, the selection of the calcining temperatures was important. The addition of ZrO2 did not change the hot-pressing sinter temperatures, and the dense bodies could be got at 1700C. Nano SiC particles were uniformly located in Al2O3 grains because of the transformation of Al2O3 from γ phase to α phase. Larger ZrO2 particles were located among Al2O3 grains, and little spherical ZrO2 particles were located in Al2O3 grains. Some Al2O3 grains were no-equiaxed. The strength of Al2O3-SiC posites was 555MPa, toughness was .
Key words posite, precessing, Al2O3, microstructure
1 引言
自从八十年代末,Niihara 等报道了一系列材料中添加亚微米级或纳米级分散相粒子后具有极高的力学性能以