高分子材料机械密封磨损特性及表面织构的影响

为提高金属/高分子材料机械密封的抗磨损性能,采用光刻-电解技术在316不锈钢表面制作微凹坑阵列形式的表面织构,与5种不同弹性模量的高分子材料组成摩擦副进行磨损试验.试验结果表明,对弹性模量最小的UHMWPE材料,表面织构起到了增磨作用,对其他四种弹性模量较高的材料,表面织构起到减磨作用,而且,随着高分子材料弹性模量的增大,表面织构表现出的减磨作用也随之增大.为解释这个现象,利用ANSYS有限元分析软件对摩擦副接触面进行了应力和变形分析,结果表明:织构化表面在接触过程中会产生应力集中和表面形变,材料的弹性模量越小,凹坑引起的变形越明显,可能产生的切削作用越显著.

The Effects of Surface Texture on the Wear Properties of Mechanical Seals Made of Metal and Polymers

In order to improve the anti-wear properties of mechanical seals made of metal and polymer, surface texture of dimple patterns was fabricated by photolithography and micro-electrochemical machining on 316 stainless steel, the wear tests of textured stainless steel against five different polymer materials were carried out. It is found that surface texture increased wear while the lowest Young's modulus material UHMWPE was used, as well as decreased wear to other four materials whose Young's modulus were higher, and the wear rate decreased significantly as the Young's modulus of polymer materials raised. Then, the FEM software ANSYS was employed to analyze the stress and deformation of contact surfaces to explain the mechanisms. The results show that textured surface increased the contact stress and deformation at the edges of texture. And the deformation became more obvious to results in cutting wear possibly while the Young's modulus was low.