Effect of Overlap Rate on Microstructure and Thermal Shock Properties of Laser Remelted Yttria Stabilized Zirconia Coating

doi:10.7652/xjtuxb201810010

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Effect of Overlap Rate on Microstructure and Thermal Shock Properties of Laser Remelted Yttria Stabilized Zirconia Coating

更新时间：2025-07-09

- Effect of Overlap Rate on Microstructure and Thermal Shock Properties of Laser Remelted Yttria Stabilized Zirconia Coating
- Vol. 52, Issue 10, Pages: 72-79(2018)
- 作者机构：
  
  1. 系统工程国家重点实验室,西安,710049
  2. 西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201810010
  CLC： TG665
- Online First：10 October 2018，
  
  Published：2018
- 稿件说明：
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Effect of Overlap Rate on Microstructure and Thermal Shock Properties of Laser Remelted Yttria Stabilized Zirconia Coating[J]. 2018, 52(10): 72-79.
DOI：

Effect of Overlap Rate on Microstructure and Thermal Shock Properties of Laser Remelted Yttria Stabilized Zirconia Coating[J]. 2018, 52(10): 72-79. DOI： 10.7652/xjtuxb201810010.

摘要

针对大面积激光重熔热障涂层后搭接区域结构的变化影响涂层使用寿命这一问题

对氧化锆涂层进行多道次激光重熔

探究了不同搭接率下重熔涂层表面及截面微观组织形貌的变化规律

并在电阻式加热炉中进行了热震实验

温度设定为1 050 ℃

分析随搭接率变化的涂层结构对热循环寿命的影响规律。通过扫描电镜观察发现:前后两个道次重熔层的裂纹在分界线处相互贯通

随着搭接率的增加

搭接区域的裂纹密度随之减小

而凹坑和微块的数目随之增加; 热震实验后

裂纹平均宽度减小至5 μm

表面出现大量凹坑

大部分由微块脱落所致; 随着搭接率的增加

搭接区域截面纵向裂纹的偏转角先增加后减小

而涂层的热循环寿命先减小后增加; 截面纵向裂纹的偏转加速水平裂纹的产生

当搭接率为0.30时

偏转角最小; 当涂层脱落面积达到20%及以上、搭接率为0.30时

重熔涂层的热循环寿命最长。

Abstract

The life of thermal barrier coatings prepared by large-area laser remelting is affected by change of structure in overlap region. The yttria stabilized zirconia coating was subjected to multi-pass laser remelting

and the change law of the surface and the cross-section microstructure morphology of the remelted coating under different overlap rates were investigated. Thermal shock experiment was conducted at 1 050 ℃ in the resistance heating furnace to analyze the influence of the coating structure with change of the overlap rate on the thermal cycle life. The result observed by scanning electron microscope shows that cracks around the dividing line between adjacent laser remelted coatings cross each other. In overlap region

with the increasing overlap rate

the density of cracks decreases

while the pits and small crumblings increase. After thermal shock experiment

the average width of surface crack decreases to 5 μm

and a large number of pits mostly caused by exfoliation of small fragments appear on the surface of laser remelted coating. As the overlap ratio increases

the deflection angle of the longitudinal cracks in the overlap region increases first and then decreases

while the thermal cycle life of the coating first decreases and then increases. The deflection of section longitudinal cracks in overlap region accelerates the generation of horizontal cracks

and the deflection angle is smallest when the overlap rate is 0.30. When the exfoliation percentage is or more than 20%

the laser remelted coating with 0.30 of overlap rate performs best.

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references

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