硅酸盐黏结剂制备摩擦材料的性能研究

树脂基摩擦材料普遍存在热衰退问题，探索解决摩擦材料的热衰退问题一直是摩擦材料研究的热点。无机黏结剂具有承受高温的特点，有望替代树脂黏结剂成为摩擦材料用黏结剂的材料。采用硅酸盐作为黏结剂，丁腈橡胶为韧性改良组分，采用热压成型工艺制备了摩擦材料。研究了硅酸盐种类及用量、橡胶含量对摩擦材料冲击韧性和摩擦磨损性能的影响，借助扫描电子显微镜（SEM）观察摩擦材料磨损表面的形貌并分析磨损机理。结果表明：钠钾比（物质的量比）为2∶1的混合硅酸盐制备的摩擦材料基体间的结合力较强，综合性能最优；适当含量的硅酸盐可以为摩擦材料提供较好的强度和韧性，并且可以实现摩擦材料的摩擦系数在全部测试温度范围内的平缓稳定，有效地改善了摩擦材料的抗热衰退性能；适量橡胶的加入可以提高摩擦材料的冲击韧性。

Study on performance of friction material combined by silicate inorganic binder

Underground brine，salt lake brine and ore are rich in lithium resources. Lithium extraction is mainly carried out from the former two，so it needs to be rationally developed and Resin based friction materials generally have thermal decay problems.Solving the thermal decay of friction materials has always been a hot topic in friction materials research.Inorganic binders have the characteristics of high temperature resis tance and are expected to replace resin binders as materials for friction materials.The silicate was used as the binder，and the nitrile rubber was used as the toughness improving component.The friction material was prepared by the hot press forming process.The effect of the type and content of silicates，the content of rubber on the impact toughness and friction and wear properties were studied.The wear morphology of the friction material was observed by scanning electron microscopy，and the wear me chanism was analyzed.The results showed that the binding force of the friction material matrices produced by the mixed sili cate with the amount of substance ratio of sodium to potassium of 2∶1 were strong and the comprehensive performance was the best.The proper content of silicate can provide better strength and toughness for the friction material，and can achieve the smoothness and stability of the friction coefficient over the entire test temperature range，and effectively improve the thermal decay resistance of the friction material.The addition of proper amount of rubber can increase the impact toughness of the material.