不同基体炭结构的炭/炭复合材料在制动过程中的温度场研究  

Study on the Temperature Field of C/C Composites with Different Carbon Matrix during Braking

作　　者：徐惠娟[1] 易茂中[1] 熊翔[1] 黄伯云[1] 雷宝灵[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《无机材料学报》2009年第1期133-138,共6页Journal of Inorganic Materials

基　　金：国家重点基础研究发展计划"973"项目(2006CB600906)

摘　　要：利用有限元热分析软件仿真了三种不同基体炭结构的炭/炭复合材料在制动过程中瞬态温度场,并通过模拟制动试验进行了验证,对比仿真计算结果与实验测试结果表明:三种样品的温度场仿真结果与实验结果基本吻合,在轴向方向存在明显的温度梯度,具有树脂炭基体的样品的温度场变化与具有粗糙层热解炭基体的样品类似,但树脂炭基体的样品的最高温度及温度梯度大于粗糙层热解炭基体的样品,而光滑层热解炭基体的样品在刹车过程中的最高温度均低于粗糙层热解炭和树脂炭基体的样品,达到最高温度的速度远远落后于前两种样品,且其温度梯度最小.炭/炭复合材料在制动过程中的瞬态温度场分布与材料的摩擦磨损性能及热传导性能密切相关,制动功率大会导致材料的摩擦表面温升高,达到最高温度的时间缩短;材料的导热性能好会导致热量的传递速度加快,使温度梯度减小.Transient temperature field of three kinds of C/C composites with different carbon matrix was simulated by means of finite element software ANSYSY during braking and was validated by braking test. The simulation results are consistent with the experiment data and high thermal gradient appears in the axis direction of the samples. The temperature field of the sample with resin-derived carbon matrix is similar to that of the sample with rough laminar （RL） pyrolytic carbon, while maximum temperature （Tmax ） and thermal gradient of the sample with resin-derived carbon are higher than those of the sample with RL pyrolytic carbon. The Tmax and thermal gradient of the sample with smooth laminar （SL） pyrolytic carbon are the least, and it＇ s temperature rises to the maximum more slower. The transient temperature field of C/C composites is decided by their friction and thermal properties. With the braking power increasing,the Tmax rises and the time to the Tmax is shorten. Good thermal properties will improve the thermal transfer and reduce the thermal gradient.

关 键 词：炭/炭复合材料 基体炭 温度场 制动 

分 类 号：TB332[一般工业技术—材料科学与工程]