EFFECT OFLa2O3ADDITION ON MICROSTRUCTURE AND WEAR BEHAVIOR OF ELECTROSPARK DEPOSITEDNi-BASED COATINGS

Gao Yuxin () and Yi Jian
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Gao Yuxin: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China
Yi Jian: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China

Surface Review and Letters (SRL), 2013, vol. 20, issue 06, 1-8

Abstract: La2O3dopedNi-based coatings have been prepared by electrospark deposition technique. The effect ofLa2O3on the microstructure, hardness and wear behavior of the as-preparedNi-based coatings is investigated by using X-ray diffractometer, scanning electron microscope, wear tribometer and Vickers hardness tester. Results indicates that the microstructure, hardness and wear resistance ofLa2O3dopedNi-based coatings are effectively improved as compared to the undoped one, and the coating with the addition of 2.5 wt.%La2O3shows the optimal improvement effects. The addition ofLa2O3can reduce the defects, refine grains and increase hardness of the coating, which can inhibit the nucleation and propagation of cracking, consequently resist cutting and fracture during the wear process. Moreover, the addition ofLa2O3leads to changes in abrasion mechanism of the coatings, and the reasons resulting in different abrasion mechanisms are discussed.

Keywords: Electrospark deposition; La2O3; Ni-based coatings; microstructure; wear resistance (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500601

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