以铬铁矿砂和酚醛树脂为主要原料获得覆膜砂,并利用热压固化法制备导热绝缘复合材料.研究了热压成型压力和酚醛树脂含量对复合材料热导率、体积电阻率和热膨胀系数的影响.结果表明:复合材料的热导率随成型压力的增加而增大;随着树脂含量的增加,热导率呈先增加后降低的趋势,体积电阻率不断增加,热膨胀系数变化不大;当成型压力为69.3 MPa,酚醛树脂含量为5%时,复合材料的热导率可达1.66 W/(m?K),体积电阻率为1.18×1011Ω?m,热膨胀系数为8.23×10-6/K,复合材料的综合性能良好.
A precoated sand was obtained from chromite sand and phenolic resin, and a thermal conduc-tive and insulating composite was prepared by hot-pressing and curing the precoated sand. The effects of hot-press molding pressure and phenolic resin content on the thermal conductivity, volume resistivity, and thermal expansion coefficient were studied. The results indicate that with the increase of hot-press mold-ing pressure, the thermal conductivity of the composite increases. With the increase of phenolic resin con-tent, the thermal conductivity of the composite increases firstly and then decreases, the volume resistivity increases continually, and the thermal expansion coefficient changes little. When the molding pressure is 69.3 MPa and the phenolic resin content is 5%, the thermal conductivity of the composite is 1.66 W/(m· K), the volume resistivity and coefficient of thermal expansion are 1.18×1011Ω?m and 8.23×10-6/K respev-tively. The composites show good comprehensive properties.
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