镍粉粒子形态对硅橡胶基复合材料拉敏性能的影响  

Effect of Shape of Nickel Powder on Pulling-Sensitivity of Silicon Rubber-Matrix Composites

作　　者：韩宝忠[1] 韩宝国[2] 张坤[2] 马凤莲[1] 冯涛[1] 

机构地区：[1]哈尔滨理工大学,黑龙江哈尔滨150040 [2]哈尔滨工业大学,黑龙江哈尔滨150090

出　　处：《稀有金属材料与工程》2008年第12期2226-2230,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50677011);中国博士后科学基金(20060390803)

摘　　要：研究了不同掺量、不同形态的镍粉填充硅橡胶复合材料的电阻率随拉应变的变化规律,并结合扫描电镜观察进行了机制分析。结果表明,掺刺球状镍粉的硅橡胶复合材料具有显著的拉敏效应,而且掺量越大,电阻率对变形变化越敏感;掺链珠状镍粉的硅橡胶复合材料在较小掺量就具有显著的拉敏效应,而且粒度越小,电阻率对变形变化越敏感;在相同镍粉粒子掺量下,掺球状镍粉的硅橡胶复合材料的拉敏性没有掺刺球状镍粉的硅橡胶复合材料的拉敏效应显著。The variation regularity of the electrical resistivity of silicon rubber-matrix composites filled with nickel powder in different fraction and particle shape with tensile strain was studied, and the microstructure of composites was observed by SEM. Experimental results indicate that the silicon rubber-matrix composites filled with the ultrafine arris spherical nickel particles present obvious pulling-sensitivity, and the sensitivity of electrical resistivity in composites to deformation increases with the fraction of nickel powder. The silicon rubber-matrix composites filled with the chain-pearl nickel particles possess with obvious pulling-sensitivity even in the case of a lower fraction of nickel powder, and the smaller the particle size of nickel power, the more sensitivity of electrical resistivity in composites to deformation is. At the same condition doped nickel power fraction, silicon rubber-matrix composites filled with the ultrafine arris spherical nickel particles have higher pulling-sensitivity than that with the spherical nickel particles.

关 键 词：镍粉 形态 硅橡胶 电阻率 拉应变 

分 类 号：TB332[一般工业技术—材料科学与工程]