【摘要】 对炭布叠层针刺C/C复合材料分别进行了不同温度的高温热处理,研究了热处理温度对C/C复合材料热学、力学和抗热震等性能的影响。结果表明,经过高温热处理,针刺C/C复合材料的导热率升高,线膨胀系数降低,材料的抗热震因子从未处理的42 kW/m提高到70 kW/m以上,表明热处理后材料具有更佳的热稳定性,但材料的弯曲强度随热处理的升高从126 MPa降到70 MPa,且经过2 000℃及更高温度处理后弯曲强度降低幅度较大。更多还原

【Abstract】 The effects of heat treatment temperature on the thermal properties,mechanical properties and thermal shock resistance of needling carbon / carbon composites were studied in this paper.The results show that after high-temperature treatment,thermal conductivity of C / C composites increase,while their coefficient of thermal expansion decrease.The thermal stress factor is found to be improved from 42 kW / m to above 70 kW / m in this process.Thus heat treatment is helpful for improving the thermal shock resistance of needling carbon / carbon composites.However,the flexural strength of needling carbon / carbon composites decrease gradually from 126 MPa to 70 MPa with the increasing heat treatment temperature,especially treated at 2 000 ℃ or even higher temperature.更多还原