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

利用凝胶注模成型工艺,在固定单体交联荆总质量的情况下,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.

EffectofDifferentRatiosBetweenMonomerandCross-linkeron PropertiesofGel-CastPorousSiliconNitride

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 crosslinking 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.