铝合金等离子体基离子注入形成AlN/TiN层及其耐磨性能

用X射线光电子能谱 (XPS)和小掠射角X射线衍射 (GAXRD)研究了铝合金LY12等离子体基离子注入形成AlN/TiN改性层的成分分布及相结构 .在此基础上测量了改性层的纳米硬度 ,并进行了摩擦磨损试验 .结果表明 ,氮和钛都能有效地注入到铝合金里 ,后注入的元素对先注元素的含量和分布有重要影响 .钛、氮同时注入在试样表面形成一层稳定的钛、氮化合层 .和未改性试样相比 ,所形成的AlN/TiN改性层纳米硬度及承载能力都提高 5倍以上 .在低滑动载荷下 ,摩擦系数减小 70 %以上 ,耐磨性提高近 10倍 ,耐磨寿命提高了近 6倍 ,粘着磨损程度显著减轻 .随着载荷的增加 ,相应的耐磨性能有所降低 .适当的改性层结构及其中分布的TiO2 、TiN、TiAl3、Al2 O3、AlN等相是性能改善的主要原因

An AlN/TiN layer of aluminum alloy implanted by PBII and its wear-resistant properties

The disfribution of composition and microstructure of the AlN/TiN layer of aluminum alloy 2024 implanted by Plasma Based Ion Implantation(PBII) were characterized using X-ray Photoelectron Spectroscopy (XPS) and Glancing Angle X-ray Diffraction (GAXRD). XPS results show that N and Ti can be implanted into 2024 effectively, the content of N presents a Gaussian-like distribution, and that of Ti decreases gradually along the implanted direction from the surface. The post-implanted elements have great influence on the content and depth profile of the pre-implanted ones. The simultaneously implanted Ti and N can form a steady layer of Ti and N on the surface. In comparison with 2024, the AlN/TiN layer has remarkably improved the mechanical properties, of which both the nano-hardness and the load bearing capacity have in most cases increased over 5 times, the friction coefficient has been decreased more than 70%, wear life has been improved near to 6 times, and the wear resistance has enhanced approximately 10 times and the degree of adhesive wear has lightened markedly at low sliding loads. Nevertheless, the wear-resistant properties are reduced gradually with increasing the sliding load. The great improvement of the mechanical properties is mainly owing to the proper structure of the layer and the presence of TiO 2, TiN, TiAl 3, Al 2O 3, and AlN phases in it.