The Influence of Mold Pressing Parameters on PTC of HDPE/CB Composites  

作　　者：易回阳 

机构地区：[1]State Key Laboratory of Mold Technology,Huazhong University of Science and Te chnology,Wuhan 430074,China [2]College of Chemistry and Enviorment Engineering,Hubei Normal University,Huangs hi 435002,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2005年第1期49-51,59,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key Program of Education Department of Hubei Province(2002A00007)

摘　　要：The influence of mold pressing parameters on the positive temperature coefficien t of high-density polyethylene/carbon black composites was investigated. The co mposites with a low resistivity at room temperature and a high positive temperat ure coefficient can be obtainee with the mold pressing parameters as follows: mo ld pressing pressure 6-14MPa, mold pressing temperature 150-170℃, mold pressi ng time about 15min, and room temperature of molded specimen after cooling for 2 0-60 minutes. The positive temperature coefficient effect of the composite is 7 .7 when it is prepared under the mold pressing parameters, and the negative temp erature coefficient effect is less than 0.8. Scanning electron microscopy (SEM) reveals some aggregations of carbon black particles with a size of 1μm inside t he composite, which was obtained at the mold pressing temperature of 180℃.The influence of mold pressing parameters on the positive temperature coefficien t of high-density polyethylene/carbon black composites was investigated. The co mposites with a low resistivity at room temperature and a high positive temperat ure coefficient can be obtainee with the mold pressing parameters as follows: mo ld pressing pressure 6-14MPa, mold pressing temperature 150-170℃, mold pressi ng time about 15min, and room temperature of molded specimen after cooling for 2 0-60 minutes. The positive temperature coefficient effect of the composite is 7 .7 when it is prepared under the mold pressing parameters, and the negative temp erature coefficient effect is less than 0.8. Scanning electron microscopy (SEM) reveals some aggregations of carbon black particles with a size of 1μm inside t he composite, which was obtained at the mold pressing temperature of 180℃.

关 键 词：COMPOSITES PTC MOLDING 

分 类 号：TG24[金属学及工艺—铸造]