摘要
为获得高性能低成本SiAlON/Al2O3基复合材料,详细探索了优质弥散相SiAlON的合成工艺,热力学反应机理,助烧剂对材料性能影响以及材料内部微结构表征。通过对1400～1700℃碳热还原氮化机理研究,分析得出系统可能存在的热力学反应,并得到相关实验的验证;通过材料内部微观组织观察及电子衍射标定研究,为该稀土氧化物掺杂、长柱晶SiAlON增强以及复合界面层固溶强化的先进复合材料设计与制备提供了有力佐证。
The synthesized process and thermodynamic mechanisms of high-quality SiAlON dispersed phase, effect of sintering additive on the properties of composite and microstructural characterizations were investigated to obtain high performance and inexpensive SiAlON/Al2O3 matrix composites. Thermodynamics reactions were given in the carbothermal reduction nitridation at 1400-1700°C which possibly occurred in the system, and finally confirmed by specific cited test (XRD). Characterizations of the microstructural observation and the resultant identified by electron diffraction pattern, would supply significant evidence for advanced composites designed and fabricated with a variety of improving mechanisms, which primarily contained suitable doping of rare metal oxide, in situ strengthening of elongated SiAlON grain and high bonding of interfacial layer.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第6期130-136,共7页
Acta Materiae Compositae Sinica
基金
国家"863"计划低成本高性能复合材料专题领域项目(2002AA334080)
国家自然科学基金项目(50332010
50172008)
教育部科学技术研究重点项目(03020)
"十五"国家科技攻关项目(2003BA612A 18)
关键词
Β-SIALON
Al2O3基复合材料
热力学
强度
微结构
Fracture
Mechanical properties
Microstructure
Morphology
Scanning electron microscopy
Structural analysis
Thermodynamic properties
Transmission electron microscopy
X ray diffraction
