激光重熔对等离子喷涂ZrO2-NiCoCrAlY梯度涂层组织与性能的影响

中国腐蚀与防护学报

1999, Vol. 19

Issue (3): 173-178

研究报告

本期目录 | 过刊浏览

激光重熔对等离子喷涂ZrO2-NiCoCrAlY梯度涂层组织与性能的影响

向兴华;尹钟大;朱景川

华南理工大学机电工程系

LASER REMELTION TREATMENT OF PLASMA SPRAYED ZrO2-NiCoCrAlY GRADED COATING

Xinghua Xiang;;;

全文: PDF(163 KB)

摘要: 在保证梯度涂层的成分分布方式不被影响的前提下，对其ZrO2表面层进行了激光重熔处理。经重熔处理后，ZrO2熔化区形成了致密的结晶组织，其硬度得以大幅度提高，涂层的抗氧化性能得到较大的改善。同时，由于涂层经受了严重的不均匀受热-冷却过程，在涂层中形成了较大的残余热应力，使ZrO2晶粒发生强烈畸变，并致使熔化区表面形成网状裂纹和少量纵向裂纹贯穿熔化区，降低了熔化区与未熔化涂层间的结合强度，对涂层的抗热震性能造成不良影响。

关键词 ：激光重熔, 等离子涂层, 抗氧化性能

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.

Key words： plasma sprayed coating laser treatment anti-oxidationproperty

收稿日期: 2005-07-22

通讯作者: 向兴华

Corresponding author: Xinghua Xiang

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引用本文:

向兴华; 尹钟大; 朱景川 . 激光重熔对等离子喷涂ZrO2-NiCoCrAlY梯度涂层组织与性能的影响[J]. 中国腐蚀与防护学报, 1999, 19(3): 173-178 .
Xinghua Xiang. LASER REMELTION TREATMENT OF PLASMA SPRAYED ZrO2-NiCoCrAlY GRADED COATING. J Chin Soc Corr Pro, 1999, 19(3): 173-178 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1999/V19/I3/173

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