A quasi-2D material CePO4 and the self-lubrication in micro-arc oxidized coatings on Al alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

View graph of relations

Author(s)

  • Pinghu Chen
  • Zhongzhen Wu
  • Qian Huang
  • Shunping Ji
  • Yuchang Weng
  • Zhongcan Wu
  • Zhengyong Ma
  • Xin Chen
  • Mouyi Weng
  • Ricky KY. Fu
  • Hai Lin
  • Xiubo Tian
  • Feng Pan

Detail(s)

Original languageEnglish
Pages (from-to)157-165
Journal / PublicationTribology International
Volume138
Online published23 May 2019
Publication statusPublished - Oct 2019

Abstract

Micro-arc oxidation (MAO)is a popular coating technology for aluminum alloys, but the wear resistance and friction properties are limited by the intrinsic properties of the alumina coatings with high friction coefficients. In this work, CePO4 is identified as a quasi-2D material by the first principle calculation. As a self-lubricating phase, it is firstly formed in situ during the oxidation process and the lubrication mechanism is investigated. Nano-grains of cerium phosphate are formed and imbedded uniformly in the alumina coatings. With increasing Ce contents, the friction coefficients diminish to 0.1–0.15 during the 5-h test without obvious fluctuation. The results reveal the new concept of using self-lubricating additives in MAO oxide on Al alloys to improve the durability and mechanical properties.

Research Area(s)

  • Al alloys, Cerium phosphate, Micro-arc oxidation, Self-lubrication

Citation Format(s)

A quasi-2D material CePO4 and the self-lubrication in micro-arc oxidized coatings on Al alloy. / Chen, Pinghu; Wu, Zhongzhen; Huang, Qian; Ji, Shunping; Weng, Yuchang; Wu, Zhongcan; Ma, Zhengyong; Chen, Xin; Weng, Mouyi; Fu, Ricky KY.; Lin, Hai; Tian, Xiubo; Pan, Feng; Chu, Paul K.

In: Tribology International, Vol. 138, 10.2019, p. 157-165.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal