(中南大學 粉末冶金國家重點實驗，長沙 410083)
摘 要: 以針刺炭纖維整體氈為預制體，采用化學氣相沉積法制備C/C多孔體，然后熔融浸滲Si和Fe制得C/C-SiC-Fe材料，研究制動速度對C/C-SiC-Fe材料摩擦磨損性能的影響。采用SEM觀察了C/C-SiC-Fe的磨損表面及磨屑形貌，結(jié)果表明：C/C-SiC-Fe材料的高速制動平穩(wěn)，隨制動速度的提高其摩擦因數(shù)先升高后降低，制動速度為12 m/s時，摩擦因數(shù)達到最大值0.59；隨著制動速度的提高，磨損率先增加后降低；當制動速度為24 m/s時，磨損率又急劇上升至3.3×10−8cm3/(N∙m)；摩擦磨損機制在低速制動條件下主要表現(xiàn)為磨粒磨損；中速時以粘著磨損為主；高速時以疲勞磨損和氧化磨損為主。
關(guān)鍵字: C/C-SiC-Fe材料；熔融浸滲；制動速度；磨損性能
different braking speeds
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:C/C performs were prepared by densification of needled carbon fiber felts with CVD. The C/C-SiC-Fe braking composites were manufactured by infiltration of moltening Si and Fe into the obtained C/C performs. The tribological characteristics of C/C-SiC-Fe composites at different braking speeds were investigated. The worn surfaces of C/C-SiC-Fe and the wear debris were examined by SEM. The results show the brake of C/C-SiC-Fe composites at high speed is stable. The coefficient of friction rises to the maximum of 0.53 at braking speed of 12 m/s firstly and then falls with increasing braking speed. The wear rates have similar change at the beginning but increase rapidly to the maximum of 3.3×10−8cm3/(N∙m) at braking speed of 24 m/s. The wear mechanism changes from abrasion, adhesion to fatigue and oxidation with increasing braking speed.
Key words: C/C-SiC-Fe material; reactive melt infiltration; braking speed; wear properties
