高导热炭纤维复合材料的制备及其性能研究

Preparation and properties of carbon fiber composites with high thermal conductivity

以聚苯硫醚为基体,中间相沥青基炭纤维为增强材料,采用热压成型工艺制备高导热炭纤维复合材料。研究了不同炭纤维含量对聚苯硫醚基复合材料结构和性能的影响。通过XRD、SEM、TEM等手段对材料微观结构进行观察分析,并测试复合材料的力学性能和导热性能。结果表明:不同炭纤维含量对复合材料性能影响不同。随着炭纤维含量的增加,力学性能随之降低,导热率随之升高。纤维含量为5%时,复合材料拉伸强度最高为45.17 MPa,弯曲强度最高为82.24 MPa,导热率最低为0.82W/m·K;纤维含量为20%时,复合材料拉伸强度最低为30.57 MPa,弯曲强度最低为69.36 MPa,导热率最高为1.88 W/m·K。通过微观形貌分析得出炭纤维结合能低,惰性高,与基体结合不够紧密。

The carbon fiber composites with high thermal conductivity were prepared by molding process using PPS as matrix, and mesophase pitch-based carbon fiber as reinforcing material. The influences of carbon fiber content on the structure and properties of PPS matrix composites were studied. The microstructures of the materials were analysed by XRD, SEM, TEM, and the mechanical properties and thermal properties of the composite were tested. Results indicated that different carbon fiber contents have different effects on the properties of the composites. With the increase of carbon fiber content, the mechanical property decreases, while thermal conductivity increases.The composite with 5% fiber content has the highest tensile strength of 45.17 MPa, the highest bending strength of 82.24 MPa, the lowest thermal conductivity of 0.82 W/m·K;while the composite with 20% fiber content has the lowest tensile strength of 30.57 MPa, the lowest bending strength of 69.36 MPa, and the highest thermal conductivity of 1.88 W/m·K.