基于UHMWPE/nano-ZnO复合材料摩擦特性的正交试验及回归分析

Orthogonal test and regression analysis on tribological property of ultra high molecular weight polyethylene composites filled with nano-ZnO

用热压成型法制备了纳米ZnO填充超高分子量聚乙烯(UHMWPE)复合材料,用销盘式摩擦磨损试验机测定了复合材料的摩擦学性能,采用四水平正交表设计试验,运用多元线性回归方法处理试验数据,分别得到了复合材料的摩擦系数和磨损率与载荷、纳米粒子含量和相对滑动线速度3个试验因素间的回归方程。结果表明,载荷对复合材料摩擦系数的影响最大,纳米粒子含量和相对滑动线速度的影响相对较小。复合材料摩擦系数随着载荷的增加而减小;试验因素对磨损率的影响程度由大到小依次为相对滑动线速度、载荷和纳米粒子含量,复合材料磨损率随着相对滑动线速度和载荷的增加而增大,随着纳米粒子含量的增加而减小。

Ultra high molecular weight polyethylene （UHMWPE） based composites filled with nanometer ZnO were prepared by thermoforming. The tribological properties of the composites were investigated on a pin-on-disc friction wear testing machine. A four-level orthogonal table was adopted in the experiment and the experiment data were processed by multiple element linear regression method. Regression equations between friction coefficient, wear rate and experimental factors （such as load, content of nanometer particle and speed） of composites were obtained. The results show that the load is the most important factor influencing the friction coefficient, and the content of the nanometer particle and speed take the less important place. The friction coefficient reduces with the increase of the load. Experimental factors affecting the wear rate in order from strength to weakness are speed, load and the content of the nanometer particle. The wear rate of composites increases with the increase of speed and load, while reduces with the increase of the content of nanometer particle.