Formation of silicon nitride bonded silicon carbide by aqueous gelcasting
Formation of silicon nitride bonded silicon carbide by aqueous gelcasting
复制标题
DOI：
10.1016/s0921-5093(02)00470-7
复制
发表时间：
2003-05
期刊：
影响因子：
6.4
通讯作者：
Z. Xie;Yi-bing Cheng;Yong Huang
中科院分区：
文献类型：
--
作者：
Z. Xie;Yi-bing Cheng;Yong Huang
凝胶注模成型是一种非常有用的制备具有复杂形状的陶瓷绿色零件的技术。虽然它已被成功地应用于陶瓷系统的亚微米尺寸的粉末，有很少的报告，凝胶注模成型陶瓷含有粗颗粒。本文对氮化硅结合碳化硅耐火材料的凝胶注模成型进行了研究。结果发现，凝胶注模成型的SNBSC的密度强烈依赖于浆料中的固体含量和有机粘结剂的含量。浆料中的高固体含量对于在烧结后实现材料的高密度是期望的。与超细陶瓷粉末相比，该材料的凝胶注模成型需要更少量的单体。此外，过量的单体可能导致聚合物燃尽或烧结后的低密度和烧结后最终产品的低强度。
Gelcasting is a very useful technique for producing ceramic green parts with complex shapes. Although it has been successfully applied to ceramic systems consisting of submicron size powders, there is little report on gelcasting of ceramics containing coarse particles. In this work, we report the study on gelcasting of silicon nitride bonded silicon carbide (SNBSC) refractory. It was found that density of SNBSC made by gelcasting is strongly dependent on the solids loading and the organic binder content in slurry. A high solids loading in the slurry is desirable for achieving high density of the materials after sintering. Less amount of monomer is required for gelcasting of this material compared to ultra-fine ceramic powders. Moreover, excessive amounts of monomer could lead to low density after polymer burnout or sintering and low strength for the final products after sintering.