玻璃纤维增强PA66复合材料与Al2O3陶瓷的摩擦磨损行为

研究了25%(质量分数)玻璃纤维增强PA66复合材料(25%GF/PA66)在干摩擦和水润滑条件下与Al₂O₃陶瓷之间的摩擦磨损行为。采用激光共聚焦扫描显微镜、 扫描电子显微镜、 傅里叶变换红外光谱仪和X射线光电子能谱分析仪对25%GF/PA66的组织、 磨损形貌和磨损表面的化学结构变化进行分析。结果表明: 相同实验载荷时,润滑条件下25%GF/PA66的摩擦系数小于干摩擦条件下的摩擦系数,但磨损体积却远远大于干摩擦条件下的磨损体积。在有水存在的条件下,机械微切削作用持续发生,温度的升高使25%GF/PA66试样变形,同时引起酰胺基团发生水解,C—C键大量断裂,导致磨损体积增加。采用扩展表面一般导热模型计算本实验所用材料的热软化温度为105.9℃。

Friction and wear behaviours between GF/PA66 composite and Al2O3 ceramic

The tribological behaviours between 25% mass fraction of glass fibers reinforced polyamide 66 composite(25%GF/PA66) and Al2O3 ceramic were studied under dry sliding and water lubricating friction condition.The microstructure,micrograph and chemical nature change of the worn surface of 25%GF/PA66 samples were examined using laser optical microscopy,scanning electron microscopy,Fourier transfom infrared spectrometer and X-ray photoelectron spectroscope.The results reveal that the friction coefficients under the water lubricated condition are lower than those of under the dry sliding condition,but the wear volume loss under water lubricating is significantly higher than that of under dry sliding for 25%GF/PA66 composite.Under water lubricated condition,continuous mechanical microcut and the increasing of the temperature induce the deformation of 25%GF/PA66 samples and the hydrolization of the amide groups,which leads the breaking of C—C link and high wear volume loss.The thermal softening temperature of 105.9 ℃ is estimated based on the generally thermal conductivity model of extended surface.