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Abstract The laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating on TC4(Ti-6Al-aV) alloy substrate was investigated.In order to maintain the gradual composition distribution,the laser remelted zone was controlled in ZrO2 top layer.Laser remelting treatment diminished the pores in the ZrO2 top layer and resulted in a dense microstrructure.Compared with the unmelted coating ,the ZrO2 melted zong had a higher micro-hardness and a more excellent oxidation resistance.However,owing to the graded coating being heated and cooled unevenly by the laser beam,a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO2 grains,some coarse cracks were formed in the coating,and the adherence strength between ZrO2 top layer and graded layers was weakened.As a result,the thermal shock property of the graded coating was worsen.
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Received: 22 July 2005
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Corresponding Authors:
Xinghua Xiang
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