摘要
将碳化硅(SiC)粒子和高密度聚乙烯(PE-HD)经粉末混合后制得导热复合材料。研究了 SiC 粒子分散状态及含量对复合材料热导率、热阻、力学性能及电绝缘性能的影响,探讨了 SiC 粒径对热导率的影响。结果表明:复合材料中 SiC 粒子围绕在 PE-HD 粒子周围,形成了特殊的网状导热通路;随 SiC 粒径增加,热导率降低;在填料体积分数为30%时,复合材料热导率、热阻、拉伸强度及冲击强度、体积电阻率和介电常数分别为1.05W/(m·K)、0.75K/W、15MPa、13.2kJ./m^2、4.6×10^(15)Q·cm 和3.03。此外,使用少量的氧化铝(Al_2O_3)纤维替代 SiC 组成混杂填料增强的材料各项性能均得到改善,并且与纯 PE-HD 相比具有优良的热传导能力。
A thermal conductive plastic composite was prepared from a particle mixture of silicone carbide （SIC） and high-density polyethylene （PE-HD）. The effects of the particle sizes of SiC and its dispersion and content on thermal conductivity and other properties of the composites were investigated. It was found that SiC particles formed a network which acted as a conductive pathway. Thermal conductivity of the composites decreased with increasing particle size of filler. When the volume fraction of SiC was 30 %, the thermal conductivity, thermal resistance, tensile strength, impact strength, volume resistivity, and dielectric constant of the composites were 1.05 W/（m· K）, 0.75 K/W, 15 MPa, 13.2 kJ/m^2, 4.6 × 10^15 Ω ·cm and 3.03, respectively. In addition, using small amount of alumina short fiber to replace SiC, the composites exhibited improved overall properties compared with pure PE-HD.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第7期10-14,共5页
China Plastics
关键词
高密度聚乙烯
碳化硅
热导率
high density polythylene
silicone carbide
thermal conductivity
