原位生长纤维状多型体AlN复合陶瓷材料的显微结构与力学性能  

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF IN-SITU FORMATION FIBROUS POLYTYPE AIN COMPOSITE MATERIAL

作　　者：李宗怀[1] 陈声崎[1] 周延春[1] 夏非[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《金属学报》1992年第7期B328-B332,共5页Acta Metallurgica Sinica

摘　　要：本文采用AlN-Y_2O_3-SiO_2,系制备出原位生长纤维状AlN多型体陶瓷复合材料,对其显微结构和生长机制进行了观察和研究,并测量其力学性能.实验结果表明,AlN-Y_2O_2-SiO_2系陶瓷复合材料的抗弯强度和断裂韧性较AlN陶瓷均有大幅度的提高,微观结构观察发现基体中存在大量共生的纤维状AlN多型体(27R,21R),系统中Y_2O_3不仅是原位生长复合AlN材料的致密剂,而且是纤维状多型体生长的媒介,SiO_2,是纤维状多型体生长的助生长剂,基体内纤维状多形体的存在提高了AlN陶瓷的强度和韧性。In-situ formation fibrous polytype AIN composite ceramic material was prepared from AlN-Y_2O_3-SiO_2 system. In comparison with AlN ceramics, both bending strength and fracture toughness of the composite material are much bettered. Microstructural observation revealed that a lot of epitaxial growth fibrous AlN polytype occurred in matrix. Y_2O_3 seems to act as a densifier for in-situ formation material and as medium for growth of fibrous polytype. SiO_2 is the growth promoter for fibrous polytype. The occurrence of fibrous polytype may increase the strength and toughness of AlN ceramic composite material.

关 键 词：ALN陶瓷 原位生长 纤维状多型体 

分 类 号：TQ174.758[化学工程—陶瓷工业]