汽车内燃机活塞的表面防护与耐磨性能研究  

Study on Surface Protection and Wear Resistance of Automotive Engine Piston

作　　者：于江江[1] 杜超博 

机构地区：[1]内蒙古交通职业技术学院汽车工程系,内蒙古赤峰024005 [2]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《铸造技术》2017年第6期1352-1355,共4页Foundry Technology

摘　　要：采用等离子Ti+N共渗的方法对汽车内燃机活塞进行表面防护处理,对比分析了基材和表面Ti-N共渗层的表面形貌、物相和常温摩擦磨损性能。结果表明,经过Ti-N共渗后的基材表面形成了厚度约为14μm的合金层,表面合金层与基体界面结合良好,组织致密、均匀。随着离表面距离的增加,Cu元素含量逐渐增加,N元素和B元素含量逐渐减少,Ti元素含量呈现先增加而后降低的趋势。汽车内燃机活塞基材的主要物相为BeCu,经过Ti-N共渗处理后的表面物相主要为BeCu和TiN。Ti-N共渗层的磨损体积和磨损率都要明显小于基材,经过等离子表面改性处理后的内燃机活塞摩擦磨损性能得到明显提高。The surface protection of internal combustion engine piston was conducted by the method of plasma Ti-N co- permeation, and the surface morphology, phase and friction and wear properties of Ti-N co-permeation layer at normal temperature were analyzed. The results show that the thickness of alloy layer after Ti-N co-permeation is about 14 Ixm, the surface alloy layer and the interface of the substrate are well combined, and the structure is compact and uniform. With the increase of distance from the surface, the content of Cu increases gradually, N and B element＇s content gradually decreases, and the content of Ti shows a trend of first increasing and then decreasing. The main phase of the engine piston substrate is BeCu, and the BeCu and TiN are main phase after Ti-N co-permeation treatment. The wear volume and wear rate of Ti-N co-permeation layer are significantly smaller than the base material, which shows the friction and wear performance of the internal combustion engine piston is obviously increased after plasma surface modification.

关 键 词：表面改性 Ti-N共渗 微观组织 耐磨性能 

分 类 号：U464.133.1[机械工程—车辆工程]