制動摩擦性能
(中南大學(xué) 粉末冶金國家重點實驗室, 長沙 410083)
摘 要: 在MM-1000摩擦試驗機上， 對一種針刺氈結(jié)構(gòu)的炭/炭（C/C）復(fù)合材料在不同熱處理溫度下的摩擦磨損性能進行了測試, 并對摩擦表面進行了光學(xué)形貌觀察；采用X射線衍射技術(shù)測試了其在不同熱處理溫度下的石墨化度, 并對石墨化度與材料的摩擦性能之間的關(guān)系進行了探討。結(jié)果表明： 隨著熱處理溫度升高, 針刺氈結(jié)構(gòu)的炭/炭復(fù)合材料的石墨化度提高, 摩擦磨損性能也相應(yīng)發(fā)生變化，即摩擦因數(shù)開始隨熱處理溫度升高而增大, 到2300℃時出現(xiàn)峰值，線性磨損和質(zhì)量磨損則在2200℃時出現(xiàn)峰值, 氧化磨損則隨熱處理溫度升高而下降。 石墨化度對材料的摩擦磨損性能有一定影響, 合理控制石墨化度可以得到理想性能的材料，對本研究所用的C/C復(fù)合材料其最佳的熱處理溫度2300℃。
關(guān)鍵字: 炭/炭復(fù)合材料；熱處理； 摩擦磨損性能； 石墨化度
C/C composites at
different heat treatment
temperatures
ZHANG Hong-bo, PENG Jian-xin
（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
