Variations of Microstructure and Mechanical Properties of Si-B-O-N Ceramics with Sintering Temperatures

作     者：Junbao ZHANG, Guangwu WEN, Tingquan LEI, Dechang JIA and Jiancun RAOSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 

作者机构：Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2002年第18卷第4期

页      面：343-346页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This research is supported by the National Natural Science Foundation of China  under grant No. 50072002 

主　　题：Si-B-O-N ceramics Microstructure. Mechanical properties toughening mechanisms 

摘      要：Si-B-O-N powder without B-O bonds synthesized by polymeric precursor were hot-pressed into ceramics at different tempera-tures. The variations of microstructure and mechanical properties of Si-B-O-N ceramics have been investigated. Crystallization of Si-B-O-N ceramics occurred at about 1400癈. Density, elastic modulus, and flexural strength of the ceramics increased with the increasing sintering temperatures, and reached to their maximum values at 1600癈. By contrast, hardness and frac-ture toughness of the ceramics monotonically changed with increasing sintering temperatures. Hardness decreased, while the fracture toughness increased. The principal toughening mechanisms including crack deflection, crack bridging and plate grain pulling-out effects are discussed