Paper Title:
Microstructure and Reciprocating Sliding Tribological Performance of Micro-Arc Oxidation Coating Prepared on Al-Si Alloy
  Abstract

Micro-arc oxidation coatings were prepared on Al-Si alloys surface by using a self-made micro-arc oxidation equipment. Its characterizations were systematically detected by Vickers hardness tester, profilometer, scanning electron microscope (SEM), energy dispersive X-ray spectrum (EDX), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). Reciprocating sliding tribological tests without lubricant of the micro-arc oxidation coating and its substrate alloy have been carried out under normal load of 5 N and displacement amplitudes of 2 mm. Dynamic analyses in combination with microscopic examinations were performed in detail through optical microscope (OM), SEM and EDX. The experimental results indicated that the MAO coating, with rough surface, high hardness and typical porous ceramic structure, is mainly consist of Al2O3, SiO2 and Al2SiO5 phases. The elementary substance Si and Al are not presented nearly on surface of coatings since the alloy is oxidated adequately during the micro arc oxidation process. Three stages can be observed in the friction coefficient curves both for the MAO coating and its substrate. The COF of the substrate was very low in initial stage, then a rapid ascend to a higher level and fluctuated in a larger range. But for the MAO coating, since its higher hardness and rough surface, the COF was higher than its substrate in initial stage. After a gradually ascent stage, the COF reached a steady state with a small range fluctuation and higher values. The wear mechanism for Al-Si alloy was main adhesive wear, abrasive wear, delamination and slight oxidative wear. After the micro-arc oxidation, the wear resistance of Al-Si alloy was greatly improved, and the wear mechanism of the MAO coating was the combination of delamination, abrasive wear, slight oxidative wear and some material transferred from the ball specimen.

  Info
Periodical
Advanced Materials Research (Volumes 97-101)
Edited by
Zhengyi Jiang and Chunliang Zhang
Pages
1518-1526
DOI
10.4028/www.scientific.net/AMR.97-101.1518
Citation
X. Z. Lin, M. H. Zhu, Z. B. Cai, J.F. Zheng, J. F. Peng, "Microstructure and Reciprocating Sliding Tribological Performance of Micro-Arc Oxidation Coating Prepared on Al-Si Alloy", Advanced Materials Research, Vols. 97-101, pp. 1518-1526, 2010
Online since
March 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sheng Zhu, Guo Feng Han, Xiao Ming Wang, Wen Bo Du
Chapter 1: Composites
Abstract:In this study, Al-Si alloy protective coating was deposited on the surface of ZM5 magnesium alloy by cold spray technology. Researchers...
142
Authors: Ai Qin Wang, Jing Pei Xie, Wen Yan Wang, Luo Li Li
Chapter 1: Material Science
Abstract:In the present work, the Al-21Si-0.8Mg-1.5Cu-0.5Mn alloys composite modified by P+RE was prepared by metal mold casting. The tribological...
28
Authors: Wei Xi Shi, Cheng Wu Du, Gui Mao Li, Zhi Ming Liu
Chapter 3: Metal-Based Materials and Alloys
Abstract:The morphology of eutectic and primary silicon phases was analyzed by OM and SEM. OM and SEM results show that pure Nd can significantly...
135
Authors: Chuang Lu, Fa Qin Xie, Li Ping Zhu
Chapter 1: Materials and Technologies of Materials Processing in Mechanical Engineering
Abstract:Microarc oxidation(MAO) was used to prepare the coatings on the surface of Al-Si alloy. Besides, scanning electron microscope (SEM), energy...
112