Preparation and microwave dielectric properties of Csf/Si3N4 composites

摘要：

The Csf/Si3N4 composites were prepared by hot-press sintering method using α-Si3N4 power,short carbon fibers and La2O3-Y2O3 sintering additives.The mechanical and microwave dielectric properties of Csf/Si3N4 composites were studied and discussed.The results show that the addition of the short carbon fibers can not destroy the relative density of the sintered samples,but it deteriorates the flexural strength of the sintered samples,so the flexural strength of the silicon nitride matrix is the highest among the samples.The real part (ε′) and the imaginary part (ε″) of the permittivity of Csf/Si3N4 composites greatly increase with increasing volume fraction of the short carbon fibers,achieve the maximum 73.1 and 101.5,respectively.A strong frequency dependence of the imaginary part (ε″) of the permittivity is observed.

关键词： Csf/Si3N4 composites short carbon fibers mechanical property dielectric properties

作者: WANG Xiao-yan LUO Fa LI Peng SU Xiao-lei ZHU Dong-mei ZHOU Wan-cheng

作者单位: State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）