Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes

LI Yong; LI Taijiang; LI Jutao; LIU Gang; LI Wei; MI Zihao

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Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes

Thermal Power Generation Vol. 44, Issue 4, Pages: 96-99(2015)

更新时间：2025-09-28

- Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG174.4
- Published：2015
- 稿件说明：
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LI Yong, LI Taijiang, LI Jutao, et al. Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes[J]. Thermal Power Generation, 2015, 44(4): 96-99.
DOI：

LI Yong, LI Taijiang, LI Jutao, et al. Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes[J]. Thermal Power Generation, 2015, 44(4): 96-99. DOI：

摘要

WC-CoCr涂层的组织结构和抗冲蚀性能主要取决于喷涂工艺。采用活化燃烧-超音速火焰喷涂(HVAF)和传统超音速火焰喷涂(HVOF)2种工艺喷涂WC-CoCr涂层

并对这2种WC-CoCr涂层的组织结构和抗冲蚀性能进行对比。结果表明:HVAF涂层孔隙率为0.2%

而HVOF涂层孔隙率为2.3%

与HVOF相比

HVAF涂层具有较低的孔隙率及表面粗糙度

涂层组织结构更均匀;HVAF过程中

WC颗粒在沉积过程中破碎

WC颗粒细小

HVAF焰流中WC的分解程度弱于在HVOF焰流中的分解程度;HVAF涂层平均硬度达到1 450HV0.3

在15°攻角下

其抗冲蚀阻力比HVOF涂层提高了59.4%

比0Cr13Ni5Mo基体提高了104.1%;90°攻角下

HVAF涂层的抗冲蚀阻力比HVOF涂层提高了16%。

Abstract

Microstructures and properties of WC-CoCr coatings are dominantly determined by fabrication processes.The microstructures and properties of the WC-CoCr coatings sprayed by the active combustion high velocity air fuel(HVAF)and conventional high velocity oxygen fuel(HVOF)processes were comparatively investigated.The results show that

the HVAF and HVOF sprayed coating exhibited porosities of 0.2% and 2.3%

respectively.The HVAF coating shows a dense and uniform microstructure and low surface roughness.Cracking of WC hardness particles in HVAF sprayed coating occurs during the impact with underlying coating or substrate.WC hardness particles in coating exhibited a small size distribution and less degrading indicated by X-ray diffraction.Vickers hardness of 1 450 was examined for the HVAF sprayed coating.The erosion resistances at 15°impact angle of the HVAF coatings are improved by 59.4%and 104.1% when compared with the HVOF sprayed coating and substrate

respectively.The erosion resistances at 90°impact angle of the HVAF coatings are improved by 16% compared with the HVOF sprayed coating.

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