The Effect of Si on Properties of PEO Coatings on Al-Si Alloys
Ceramic coatings were deposited on Al-Si alloys by plasma electrolytic oxidation (PEO). The Al-Si alloys with 6.4％ Si and 15.6％ Si in weight were chosen as substrates. The morphology, composition and microstructure of the PEO coatings were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The distributions of hardness (H) and elastic modulus (E) across the coatings were determined by nano-indentation method. Scratch test was used to study the interfacial bonding strength of these coatings. It was found that there were more cracks and pores existing in coating on the substrate with high content of Si. XRD results showed that coatings consisted of α-Al2O3, γ-Al2O3 and mullite. Furthermore, the diffraction peaks of Al phase were indicated on XRD pattern for PEO coating on the alloy with 15.6％ Si. The hardness and elastic modulus reduced with the increase of content of Si, from 12 Gpa to 4.8GPa and 180 Gpa to 80 Gpa respectively. As a result of scratch test, the interfacial bonding strength of coating on the alloy with low content of Si was three times than that on the other substrate.
PEO Al-Si alloys nano-indentation scratch test
XU Fang-tao LI Guang XIA Yuan
Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China Graduate School of the Chine Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
635-639
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）