增强纤维对陶瓷基摩擦材料摩擦磨损性能的影响

Effects of Reinforced Fibers on Friction and Wear Properties of Ceramic-based Friction Material

采用热压烧结法制备纤维增强陶瓷基摩擦材料,研究了钢纤维、钢纤维/莫来石纤维、莫来石纤维、钢纤维/硅酸铝纤维以及硅酸铝纤维增强陶瓷基摩擦材料的摩擦磨损特性.研究结果表明:不同纤维对陶瓷基摩擦材料摩擦系数的影响较为复杂.相比较添加单一纤维增强摩擦材料的情况,钢纤维增强的试样具有较好的耐磨性能,其次为莫来石纤维增强的试样,硅酸铝纤维增强的试样表现出最差的耐磨性能,钢纤维/莫来石纤维和钢纤维/硅酸铝纤维增强试样的磨损均低于相应的陶瓷纤维增强的试样;在高温下以莫来石纤维增强的试样,其磨损形式以磨粒磨损为主,而以硅酸铝纤维和钢纤维/硅酸铝纤维增强的试样的主要磨损形式为黏着磨损,钢纤维和钢纤维/莫来石纤维增强的试样的磨损属于磨粒磨损和黏着磨损.

Ceramic-based friction materials with different reinforced fibers was prepared by hot-pressing.The effects of steel fiber,steel/mullite fiber,mullite fiber,steel/aluminium-silicate fiber and aluminium-silicate fiber as reinforcing materials on the friction and wear properties of ceramic-based friction material were investigated.The results show a complex relationship between different kinds of reinforced fibers and the friction coefficients.For friction material reiforced by single fiber,steel fiber reinforced sample had the highest wear resistance,while aluminium-silicate fiber reinforced sample had the poorest wear resistance,mullite fiber reinforced sample had the moderate wear resistance.The wear rates of sample with steel/mullite fiber or steel/aluminium-silicate fiber were lower than that of the samples reinforced by the corresponding ceramic fibers.The friction and wear tests at elevated temperature reveal that the main wear mechanism of mullite fiber reinforced ceramic-based friction material was abrasive wear while the main wear mecanism for friction materials with aluminium-silicate fiber and steel/aluminium-silicate fiber were adhesive wear.Abrasive wear and adhesive wear were the dominated wear machanisms for the friction material containing steel fiber and steel/mullite.