单体与交联剂比例对凝胶注模成型多孔氮化硅性能的影响  

Effect of Different Ratios Between Monomer and Cross-linker on Properties of Gel-Cast Porous Silicon Nitride

作　　者：严友兰[1] 余娟丽[1] 张健[2] 张大海[2] 王红洁[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]航天材料及工艺研究所先进功能复合材料技术国防科技重点实验室,北京100076

出　　处：《宇航材料工艺》2010年第2期59-62,共4页Aerospace Materials & Technology

基　　金：国家重点实验室先进功能复合材料项目(9140C5602040805);国家自然科学基金(90816018);西安市科技攻关计划[CXY08006(1)]

摘　　要：利用凝胶注模成型工艺,在固定单体交联剂总质量的情况下,改变单体与交联剂的质量比例,制备出不同单体与交联剂比例的多孔氮化硅陶瓷。借助扫描电子显微镜、Archimedes法和三点弯曲法等方法研究了单体与交联剂比例对多孔氮化硅陶瓷的微观结构和基本力学性能的影响。结果表明,随着单体与交联剂比例的增大,试样的干燥收缩率增大;当单体与交联剂比例≥15时,试样排胶后出现开裂现象;当单体与交联剂比例<15时,随着单体与交联剂比例增大,烧成后的试样强度呈增大的趋势。By using gel-casting process, porous silicon nitride ceramics of different ratios between monomer and cross-linker were prepared under the condition of a fixed total amount but different proportion of monomer and cross-linking agent. The effects of different proportion of monomer and cross-linking agent on the microstructure and mechanical properties of porous silicon nitride were studied by means of the scanning electron microscopy （SEM）,archimedes method and three-point bending method. The results showed that the drying shrinkage of specimens increased as the proportion of monomer and cross-linking agent increased, the specimens cracked after binders burning when the proportion of monomer and cross-linking agent was above or equal 15. However, those sintering specimens with proportions of monomer and cross-linking agent below 15 displayed a rising trend of strength as the proportion increased.

关 键 词：凝胶注模 排胶 比例 氮化硅 显微结构 

分 类 号：TQ174[化学工程—陶瓷工业]