低密度炭/炭保温材料导热性能的影响因素

Factors Affecting Thermal Conductivity of Low-density Carbon/carbon Insulation Materials

本文制备了四种低密度炭/炭保温材料,分析了材料成型结构、基体炭类型、处理温度以及材料密度对导热系数的影响。结果表明:针刺整体毡结构导热系数最大,薄毡粘接结构导热系数最小,而厚毡粘接和薄毡与厚毡交替铺层结构的导热系数介于两者之间。树脂炭基体的炭/炭保温材料导热系数小于热解炭基体的导热系数。对于薄毡粘接结构低密度炭/炭保温材料随着处理温度的升高,导热系数呈上升的趋势。同样,薄毡粘接结构低密度炭/炭保温材料随着密度的增大,导热系数增大。

Four preparation methods for low-density C/C （LD-C/C） insulation materials were employed, and how the reforming structure, carbon matrix, heat treatment temperature and density of the materials affect the thermal conductivity of the LD-C/C insulation material were investigated. The results show that the thermal conductivity of the needle-punched felt overall structure is the highest, that of the thin felt adhesive structure is the lowest, and those of the thick felt adhesive structure and the thin felt with thick felt alternately overlay structure are intermediate. Furthermore, the thermal conductivity of the resin carbon matrix C/C insulation is lower than that of the pyro-carbon matrix C/C insulation. The thermal conductivity of thin felt adhesive structure C/C insulation increases with the increase in heat treatment temperature. Similarly, the thermal conductivity of low density C/C insulation material is enhanced withincreasing density.