刹车条件对铁基粉末冶金材料摩擦磨损性能的影响

采用粉末冶金法制备某型号飞机用铁基刹车材料,研究了刹车条件对铁基刹车材料摩擦磨损性能的影响,利用光学显微镜观察铁基刹车材料表面及其磨损表面形貌,利用X射线衍射仪分析其组织的变化情况.结果表明:随着刹车条件(单位面积吸收能量)的增加,铁基刹车材料的摩擦系数减小,磨损量增大,摩擦表面温度升高;磨损前铁基刹车材料由粗大的细片层珠光体和块状铁素体组成,随着吸收能量的增加,细片层珠光体较使用前明显增多和细化;当刹车条件从正常着陆刹车变为超载着陆刹车时,其摩擦表面Fe的高价氧化物比例增大.

Effects of Brake Conditions on Tribological Properties of Fe-based Powder Metallurgy Material

A kind of brake material on some model planes was made by powder metallurgy process. The material was used to analyze the relationship between brake conditions on friction coefficient and abrasion rate. The material surface before and after experiments were analyzed through metallographic analysis by optical microscopy, and the surface microstructure was also analyzed by X-ray diffraction. The results show that, with the increasement of energy absorption in unit area, the friction coefficients of materials decreased, wear rates increased, and temperature of friction surface rose. Microstructure of materials was mainly composed of coarse thin pearlite and bulk ferrite before experiment, the content of thin pearlite was obviously raised and thinner due to increase of absorption energy after experiment. At the same time, analysis of composition indicates that the high-valence iron oxide of friction surface had a higher content with increasement of braking energy.