钛酸钾含量对汽车摩擦材料性能的影响

钛酸钾是替代石棉用于摩擦材料中的一种新兴增强材料。以一种低金属陶瓷配方为基础,采用粉末冶金法制备钛酸钾增强摩擦材料,研究钛酸钾含量(质量分数,%)对摩擦材料的物理性能、力学性能、摩擦磨损性能及制动噪音的影响。结果表明,随钛酸钾含量增加,摩擦材料的气孔率增加,密度降低,pH值增加;洛氏硬度增加,压缩性及内剪切强度降低;摩擦系数稳定性增强,磨损量先降低后增加;噪音发生频次先降低后增加。钛酸钾含量为12%时,磨损量最低,噪音表现最佳。

Influences of Potassium Titanate Content on the Performance of Automobile Brake Materials

The potassium titanate flakes is a new type of reinforced material replacing asbesto used for friction material. The potassium titanate enhanced friction materials were prepared by powder metallurgy method based on a mature low metal ceramic formula. The influence of potassium titanate content (mass fraction, wt%) on the physical performance, mechanical property, friction and wear properties, and brake noise of the friction materials were investigated. The results indicate that with the increase of potassium titanate content, the porosity of friction material, pH value and Rockwell hardness value increased, while the density, compressibility and inner shear strength decreased. The stability of the friction coefficient was improved and the wear loss decreased firstly then increased. The change of the brake noise occurring frequence showed the same trend as the wear loss. When the potas-sium titanate content was 12%, the wear loss was the lowest, and the noise performance was the best.