摘要
采用SHS重力分离技术制备出内衬Al2 O3 ZrO2 复相陶瓷。复相陶瓷基体主要由纤维状 (Al2 O3 +ZrO2 )共晶体组成 ,其中共晶体的ZrO2 纤维直径达到纳米 /微米尺度。经Vickers压痕法测试其断裂韧度为1 5 96MPa·m1 / 2 ,SEM观察和陶瓷材料断裂韧度测试得出裂纹的扩展主要受共晶体中Al2 O3 ZrO2 纳米 /微米相增韧机制控制 ,迫使裂纹沿共晶体边界或层片共晶体Al2 O3 ZrO2 相界偏转 。
Al 2O 3 ZrO 2 composite ceramic liner in a pipe was fabricated by means of in situ crystallization out of gravitational separation in SHS process with the matrix being mainly composed of (Al 2O 3+ZrO 2) fiber eutectic structure and diameter of ZrO 2 fiber being on a nano/micron scale The ceramic material was analysed by SEM and indentation test The results showed that fracture toughness of the material was up to 15 96 MPa·m 1/2 Crack propagating process was strongly controlled by Al 2O 3 ZrO 2 nano/micron phase toughening mechanism and cracks were forced to be strongly deflected along the boundary of the eutecticums and interface between Al 2O 3 and ZrO 2,so that high fracture toughness was maintained
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2004年第4期218-222,共5页
Powder Metallurgy Technology
基金
国家自然科学基金资助项目 (5 9972 0 4 3)
军械工程学院科研基金资助项目 (YJJXM0 2 0 1 3)
