钼酸铵/丁腈橡胶改性酚醛树脂对摩擦材料性能的影响

制备了以未改性PF、市售改性PF、钼酸铵/丁腈橡胶复合改性PF作为基体的摩擦材料,研究了钼酸铵/丁腈橡胶改性酚醛树脂(PF)对树脂基摩擦材料摩擦磨损性能的影响,并对不同树脂基摩擦材料的冲击强度、硬度和摩擦磨损性能进行了测试。结果表明,复合改性PF基摩擦材料的冲击强度为3.51~3.72 k J/m2,硬度为73~82,高于未改性PF基摩擦材料的冲击强度(3.22 k J/m2)和硬度(52),有效提高了摩擦材料的韧性和硬度。以复合改性PF为基体的摩擦材料,其摩擦系数的稳定性得以提高,其中以含量为10%的摩擦材料最为稳定,磨损率最小。当树脂添加量相同时,复合改性PF基摩擦材料的摩擦系数的稳定性最好,且摩擦系数值保持在0.37~0.40之间,比未改性PF基摩擦材料的摩擦系数和市售改性PF基摩擦材料摩擦系数稳定;复合改性PF基摩擦材料的高温(350℃)磨损为0.45×10~(–7)cm~3/(N·cm),远低于未改性PF基摩擦材料的1.50×10~(–7)cm~3/(N·cm)和市售改性PF基摩擦材料的0.67×10~(–7)cm~3/(N·cm),抗高温热衰退性最好。

Effects of Phenolic Resin Modiifed Ammonium Molybdate and Rubber Nitrile on Performances of Friction Materials

To study the effects of ammonium molybdate/rubber nitrile composite modified phenolic resin (PF) on the per-formances of friction materials,the friction materials with unmodified PF,commercially available modified PF and ammonium molybdate/nitrile rubber-modified PF as matrix were prepared respectively. The impact strength,hardness,friction coefficient and wear rate of different resin-based friction materials were tested. The results show that the impact strength of friction materials with composite modified PF are 3.51–3.72 kJ/m2,which are higher than that of unmodified PF (3.22 kJ/m2),and hardness are 73–82, which are harder than that of unmodified PF (52). Composite modified PF effectively improves the toughness and hardness of fric-tion materials. Stabilities of the friction coefficient of friction materials with composite modified PF changed better,the friction coefficient of the friction material is most stable when the content of composite modified PF is 10%,and wear rate is lowest. When the content of matrix is the same,the friction coefficients of friction materials with composite modified PF are most stable,the fric-tion coefficient are among 0.37 to 0.40,which is more stable than that of friction material with original PF and friction material with commercially available modified PF. The wear rate of friction material with composite modified PF at high temperature (350℃) is 0.45×10–7 cm3/(N·cm),less than that of friction material with original PF [1.5×10–7 cm3/(N·cm)] and friction material with commercially available modified PF [0.67×10–7 cm3/(N·cm)]. Friction materials with composite modified PF have the best ther-mal debilitating resistance at high temperature.