Effect of laser power on mechanical properties of ultrasonic assisted laser clad Al2O3-ZrO2 ceramic

doi:10.13251/j.issn.0254-6051.2020.02.043

Abstract

Abstract:

Al₂O₃-ZrO₂ ceramic coating was prepared on the Ti-6Al-4V substrate by laser cladding process. The effect of different ultrasonic assisted cladding laser power on the morphology and properties was investigated. The macroscopic morphology, section morphology, phase composition, microstructure, micro-hardness and wear behavior of the laser clad Al₂O₃-ZrO₂ coating were investigated by means of metallographic microscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and micro-hardness test, respectively. The results show that the dilution rates of the coatings increase first and then decrease with the increase of laser power. The dilution rates are 65.86%, 68.55%, 76.04%, 71.57% and 68.23% with the laser power increasing from 1100 W to 1500 W, respectively. The clad layer is mainly composed of TiAl, TiO and ZrO₂ and the average microhardness of the clad layers increases first and then decreases with the increase of laser power. The average friction coefficient of the clad layers with a laser power of 1200 W is comparatively lower, about 0.27, compared with three other clad layers with a laser power of 1300, 1400 and 1500 W, its wear mechanism is abrasive wear, and the wear mechanism of the other three clad layers is abrasive wear and adhesive wear.

Key words: laser power, ultrasonic vibration, Al₂O₃-ZrO₂ ceramic, clad layer

CLC Number:

TB332

Li Cheng, Wang Yuling, Jiang Fulin, Zhang Jie, An Xianglong. Effect of laser power on mechanical properties of ultrasonic assisted laser clad Al₂O₃-ZrO₂ ceramic[J]. HTM, 2020, 45(2): 218-224.

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Effect of laser power on mechanical properties of ultrasonic assisted laser clad Al₂O₃-ZrO₂ ceramic

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