摘要
为了研究压电陶瓷颗粒对结构陶瓷力学性能的影响 ,把不同的压电陶瓷颗粒加入到Al2 O3 结构陶瓷 ,发现LiTaO3 与Al2 O3 在烧结时能稳定共存 .烧结温度高于 14 0 0℃时 ,LiTaO3 发生熔化 ,冷却后呈网状分布在Al2 O3 基体晶界 ;低于 14 0 0℃烧结 ,LiTaO3 颗粒弥散分布在Al2 O3 基体中 .采用 2 0 0MPa冷等静压成型 ,130 0℃ (保温 3h)空气气氛下无压烧结 ,最后于 130 0℃ ,15 0MPa(保温保压 1h)氩气气氛下热等静压制备了LiTaO3/Al2 O3 陶瓷复合材料 .对其显微结构与力学性能进行了研究 ,结果表明 ,LiTaO3 体积分数为 5 %的陶瓷复合材料具有最高的抗弯强度与断裂韧性值 ,分别达到 438.7MPa和 5 .4MPa·m1 / 2 .电畴运动和
Effect of piezoelectric ceramic particles on the mechanical of structural ceramics studied. It is found that LiTaO3 can coexist with Al2O3 during sintering by adding piezoelectric ceramic particles into Al2O3 matrix. Below 1400°C LiTaO3 particles were distributed homogeneously in Al2O3 matrix when sintered. LiTaO3/Al2O3 ceramic composites were fabricated by cold isostatically pressing 200 MPa and pressurelessly sintering at 1300°C for 3 h followed by hot isostatically pressing at 1300°C under 150 MPa for 1h. The microstructure and mechanical properties of the composites were investigated. The bending strength and fracture toughness of the ceramic composite with LiTaO3 volume percentage of 5% reach the highest values of 438.7 MPa and 5.4 MPa×m1/2 respectively. Energy dissipation due to domain wall motion or/and piezoelectric effect is suggested as a new strengthening and toughening mechanism in ceramic.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2001年第5期431-434,共4页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金资助项目 ( 5 9972 0 0 6 )
关键词
压电陶瓷
结构陶瓷
复合材料
力学性能
增韧
制备
复合陶瓷
Alumina
Ceramic materials
Fabrication
Lithium compounds
Mechanical properties
Piezoelectric materials
Sintering
Tantalum compounds
