PTC CHARACTERISTIC OF Sn-Pb ALLOY-LOADED POLYMER COMPOSITES
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摘要: 通过球磨、热压制备了Sn-Pb/PS,Sn-Pb/HDPE复合材料。研究了复合材料的导电性能。结果证明:Sn-Pb／PS复合材料具有PTC效应,有PTC强度大、转变陡的突出优点;其 PTC性能是由填料相变的发生引起的。Sn-Pb／HDPE复合材料具有双PTC效应,两次PTC转变分别由基体和填料在其熔点处发生相变引起的,其 PTC强度也有独特之处。Abstract: PTC characteristics of PS and HDPE composites incorporated with Sn-Pb alloy particles were studied. The composites were made by mixing in a satellite ball mill and hot-pressed in a matched metal die. The results show that the low melting point of Sn-Pb alloy results in the excellent PTC characteristics. The electrical resistivity of the Sn-Pb alloy filled PS exhibits PTC characteristic with high density and abrupt transition. The electrical resistivity of the Sn-Pb alloy-loaded HDPE composite exhibits two PTC transitions near the melting points of Sn-Pb alloy and HDPE, respectively.
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