中文摘要：

研究了中密度（1．45～1．55g／cm^3）针刺C／C复合材料分别经过1800℃、2000℃、2200℃高温处理后的热学和力学性能变化。随着处理温度的升高，材料的径向压缩强度逐渐降低，1800℃处理后材料的轴向压缩强度高于未处理试样。室温拉伸强度随处理温度的升高而增大，高温拉伸强度则随处理温度的升高而降低，未处理试样高温拉伸强度达到94．7MPa，2200℃处理后只有65．6MPa，但仍高于室温拉伸强度（50MPa左右）。不同温度处理后材料的高温轴向弯曲最大载荷应变和模量趋于一致，而室温测试结果随着处理温度的升高而降低。轴向拉伸模量和延伸率随温度变化的规律性则不强。材料的轴向热膨胀系数随处理温度的升高而降低，但变化幅度不大，室温至1000℃线胀系数为（1．5～2．0）×10^-6／℃。未处理试样和1800℃处理试样的径向导热系数相当，1000℃时约为11W／（m·K），2000℃和2200℃处理试样的导热系数相当，1000℃时约为15W／（m·K）。与1800℃处理后薄壁构件的变形性相比，2200℃处理构件变形大，出现不等量变形现象。

英文摘要：

The influence of the heat treatment temperature on the medium density C/C composite property is studied. The radial compression strength decreases as the heat treatment temperature increases, and the axial compression strength of the sample with 1800℃ HTT is higher than the sample without HTT. The room temperature axial tensile strength of the medium density C/C composites increases as the HTT temperature increases, but the tensile strength at 1800℃ has the reverse tendency. The axial tensile strength of the sample without HTT reaches 94. 7MPa, after 2200℃ HTT what is only 65. 6MPa, and is still better than the RT property （about 50MPa）. Through different HTT, the maximum axial flexible load and modulus tends to the same, but the room temperature test result decreases as the HTT temperature increases. There is no rule in the axial tensile modulus and elongate. The axial thermal ex- pansion coefficient lies in the range （1.5-2. 0）× 10^-6/℃. The radial thermal diffusive coefficient of the sample without HTT and after 1800℃ HTT is about 11W/（m · K）, and the sample after 2000℃ and 2200℃ HTT is about 15W/ （m · K）. Comparison with the deformation of thin configuration after 1800℃ HTT, the deformation degree is more severer after 2200℃ HTT.