制动摩擦性能
(中南大学 粉末冶金国家重点实验室, 长沙 410083)
摘 要: 在MM-1000摩擦试验机上， 对一种针刺毡结构的炭/炭（C/C）复合材料在不同热处理温度下的摩擦磨损性能进行了测试, 并对摩擦表面进行了光学形貌观察；采用X射线衍射技术测试了其在不同热处理温度下的石墨化度, 并对石墨化度与材料的摩擦性能之间的关系进行了探讨。结果表明： 随着热处理温度升高, 针刺毡结构的炭/炭复合材料的石墨化度提高, 摩擦磨损性能也相应发生变化，即摩擦因数开始随热处理温度升高而增大, 到2300℃时出现峰值，线性磨损和质量磨损则在2200℃时出现峰值, 氧化磨损则随热处理温度升高而下降。 石墨化度对材料的摩擦磨损性能有一定影响, 合理控制石墨化度可以得到理想性能的材料，对本研究所用的C/C复合材料其最佳的热处理温度2300℃。
关键字: 炭/炭复合材料；热处理； 摩擦磨损性能； 石墨化度
C/C composites at
different heat treatment
temperatures
（State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract:Friction and wear properties of C/C composites from a needled felt structure were investigated at different heat treatment temperatures (HTTs) on the MM-1000 friction tester. The worn surface morphologies of samples were examined by optical microscopy. The graphitization degree was tested at different HTTs by X-ray diffraction technology. The relations between the graphitization degree and friction properties were discussed. The experimental results indicate that the graphitization degree increases with increasing HTT and friction properties change with HTT. The friction coefficient increases with increasing HTT and reaches the maximum at 2300℃. The dimension loss and mass loss reach the maximum at 2200℃. The oxidation loss decreases with increasing HTT. The graphitization degree affects the friction and wear properties of the materials to a certain degree. The reasonable control of graphitization degree can obtain materials with ideal properties. To C/C composites in this study, the optimum HTT of C/C composite is 2300℃.
Key words: C/C composites; heat treatment; friction and wear properties; graphitization degree
