石英硅微粉对绝缘灌注胶电阻率和抗压强度的影响

EFFECT OF QUARTZ SILICA POWDER ON RESISTIVITY AND COMPRESSIVE STRENGTH OF INSULTING POURING SEALANT

为了给石英硅微粉绝缘灌注胶的制备与应用提供科学依据,采用数字高阻计、自制小型电极和WE-100型液压万能试验机等,研究了石英硅微粉电阻率特征及其对绝缘灌注胶电阻率和抗压强度影响,并采用扫描电镜(SEM)对材料微观组织结构进行了分析,结果表明:石英硅微粉的体积电阻率和表面电阻率都低于微晶白云母和α-氧化铝粉,但它们几乎处于同一数量级;石英硅微粉用量≤40phr时,对绝缘灌注胶的体积电阻率和表面电阻率都有一定的改善作用,当用量60phr^120phr时,材料电阻率呈逐渐下降趋势,但没有明显的不利影响;石英硅微粉对绝缘灌注胶的抗压强度有明显改善作用,当用量≤120phr时,随着用量的增加抗压强度会而逐渐增大;活性硅微粉对绝缘灌注胶电阻率的改善作用和抗压强度的增强效果以及掺入量都优于未改性硅微粉。

In order to provide a scientific basis for preparation and application of quartz silica powder insulting pouring sealant, the resistivity characteristics of quartz silica powder and their effect on resistivity and compressive strength of the insulating pouring sealant were studied by u- sing digital high resistance meter, homemade small electrode and WE-100 hydraulic universal tes- ting machine. Moreover,the microstructure of the materials was analyzed by using SEM. The re- sults show that the volume resistivity and surface resistivity of quartz silica powder are both lower than those of alpha alumina and micro crystal muscovite, while they are almost at the same level. When the amount of quartz silica powder is less than or equal to 40 phr,it has certain improve- ment effects on the volume resistivity and surface resistivity of insulating pouring sealant virtual- ly; and when the amount of quartz silica powder is between 60 phr and 120 phr,the electrical re- s{stivity of materials decreased gradually, without obvious disadvantageous effect. Quartz silica powder has a significant effect on the compressive strength of insulating pouring sealant because the compressive strength increases when the amount of quartz silica powder is under or equal to 120 phr. The active silica powder i8 better than the unmodified silica powder in the improvement of resistivity;it enhances the compressive strength and incorporation of insulating pouring seal- ant.