硅氧氮陶瓷的先驱体法合成及性能的研究  

Precursor synthesis and mechanical properties of silicon oxynitride

作　　者：张俊宝[1] 温广武[1] 贾德昌[1] 雷廷权[1] 周玉[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《航空材料学报》2001年第3期39-42,共4页Journal of Aeronautical Materials

基　　金：国家自然科学基金 ( 5 0 0 72 0 0 2 )

摘　　要：用 Si Cl4为原料 ,通过水解和氨解的方法 ,制备了不同含氮量的硅氧氮先驱体。先驱体通过脱氨基原位聚合 ,再经过无机化转变成为成分均匀的硅氧氮粉体 ,用所得粉体热压烧结制备了硅氧氮材料。测试分析结果表明 ,氮的引入使氧化硅的析晶温度提高了 1 5 0℃ ;适量析晶显著提高材料的力学性能 ;烧结温度为 1 4 0 0℃时 ,氮的质量分数为 2 4 .3%材料的强度和韧性最大 ,分别达到 1 5 6 MPa和 1 .8MPa· m1 / 2 ,比 Si O2 基体的强度和韧性提高了 4 .5 8倍和 2 .2 5倍。Silicon oxynitride precursors with different nitrogen content were synthesized from hydrolysis and ammonolysis of SiCl4. Pyrolyses of the precursors were completed from in-situ polymerization and inorganic conversion via amino group releasing. Silicon oxynitride ceramics were successfully fabricated by hot-pressing of resulted powders. Analysis results indicated that crystallization temperature of silica was increased 150 C by introduction of nitrogen, mechanical properties of silicon oxynitride were significant increased by proper crystallization, Flexural strength and fracture toughness reached 156MPa and 1.8MPa &middot m1/2 for the material with 24.3 mol% nitrogen sintered at 1400 C, being 4.58 and 2.25 times of that of SiO2 matrix material respectively.

关 键 词：硅氧氮陶瓷 热分解 力学性能 先驱体法 四氯化硅 水解 氨解 粉体 热压烧结 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]