中间相沥青基石墨纤维复合材料的制备与导热性能研究  

Preparation and thermal conductivity properties of mesophase pitch-based graphite fiber composites

作　　者：房怡[1] 迟伟东[1] 刘辉[1] 于建民[1] 黄新然[1] 沈曾民[1] 

机构地区：[1]北京化工大学材料科学与工程学院碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《炭素技术》2013年第6期6-10,35,共6页Carbon Techniques

摘　　要：以中间相沥青基连续、短切石墨纤维和环氧树脂为原料，采用热压成型二[：艺制备导热复合材料。主要研究了树脂与中间相沥青基石墨纤维配比（树脂含量通过稀释剂进行调节）、短切纤维长度对复合材料导热性能和力学性能的影响。结果表明：稀释剂添加量在5％～20％内，连续纤维复合材料导热率随着稀释剂含量的增加而增大，在稀释剂含量为20％时达到最大，为259．29W／（m·K）；添加长度为l～7mm的短切纤维，复合材料沿样条方向导热率随纤维长度的增加而增大，以长度为7mm的短切纤维制备山的复合材料导热率最大，达到98．17W／（m·K）；控制稀释剂含量，短切纤维复合材料导热率随着稀释剂含量的增加而增大，在稀释剂含量为30％时达到最大，为117．60W／（m·K）。The thermal conductive composites were prepared from the mesophase pitch-based continuous,chopped graphite fiber and epoxy resin by molding process. The influences of the ratio of the resin to mesophase pitch-based graphite fiber composition （resin content to be adjusted by diluter）and the length of the chopped fiber on conductivity and mechanical properties of the composites were studied. Results indicated that the thermal conductivity of continuous fiber composites increased with the decreasing of the diluter in the range of 5% to 20%. When the content of the diluter is 20% ,the thermal conductivity of composite reached the maximum 259.29 W/（m. K）. The thermal conductivity of the chopped fiber composites with the direction of the spline increased with the increasing of the length of the fiber in the range 1 mm to 7 mm; when the length of fiber is 7 mm, the maximum thermal conductivity of composites was 98.17 W/（m. K）. Controlling the content of resin, the thermal conductivity of the chopped fiber composites was increased with the decreasing of the diluter content; when the content of the diluter is 30%, the thermal conductivity of composite reached a maximum of 117.60 W/（m. K）.

关 键 词：复合材料 石墨纤维 环氧树脂 导热率 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]