Porous Si3N4 Fabricated Using Benzoic Acid as Pore-Forming Agent

摘要：

　　In this study,porous Si3N4 ceramics with interconnected pores were prepared by cold isostatic pressing using benzoic acid as a pore-foring agent.The pore-forming agent of green bodies were sublimation rapidly below 200℃ without carbon remained.Mechanical Properties were tested by universal testing machine,and the microstructures of the specimen were observed by scanning electron microscopy (FEI Sirion 200).The resulting shows,many fibrous β-Si3N4 grains grown from the internal wall of the round pores,and the porous distribution uniform in the matrix.By changing the content of benzoic acid,the silicon nitride ceramic with different porosity was fabricated.As the acid content decreased from 15wt% to zero,the porosities decreased from 57.6% to 48.0%,flexural strength increased from 36.8MPa to 141.2MPa.Both the grains and suitable interfacial bonding strength contribute to the high fracture strength.

关键词： Porous Si3N4 Benzoic Acid Porosity Mechanical Properties

作者: Hongsheng Wang Kai Liu Chonghai Wang Jian Liu Rong Liao Fang Gao Ruixiang Liu

作者单位: Shandong Research &Design Institute of Industrial Ceramics,Zibo 255031,China Air Force Military Representative Office in Shandong Province,Jinan 250023,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 820-823

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）