真空热处理超音速火焰喷涂制备Ni基WC涂层的结构与耐磨性

doi:10.13251/j.issn.0254-6051.2025.03.045

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 284-290.DOI: 10.13251/j.issn.0254-6051.2025.03.045

真空热处理超音速火焰喷涂制备Ni基WC涂层的结构与耐磨性

刘军¹, 纪乙智², 李巍³, 廖斌¹, 曹志刚², 黄修喜², 刘思晔¹, 董会⁴

1.国家能源集团宝庆发电有限公司, 湖南邵阳 422000;
2.华能海南发电股份有限公司东方电厂, 海南东方 572633;
3.西安热工研究院有限公司, 陕西西安 710001;
4.西安石油大学材料科学与工程学院, 陕西西安 710065

收稿日期:2024-10-06 修回日期:2025-01-18 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 李巍,研究员,硕士,E-mail:liwei@tpri.com.cn
作者简介:刘军(1988—),男,工程师,学士,主要研究方向为火力发电锅炉运行检修技术管理工作,E-mail:770131577@qq.com。

Microstructure and wear resistance of Ni-based WC coating prepared by HVOF spraying and vacuum heat treatment

Liu Jun¹, Ji Yizhi², Li Wei³, Liao Bin¹, Cao Zhigang², Huang Xiuxi², Liu Siye¹, Dong Hui⁴

1. National Energy Group Baoqing power generation Co., Ltd., Shaoyang Hunan 422000, China;
2. East Power Plant, Huaneng Hainan Power generation Co., Ltd., Dongfang Hainan 572633, China;
3. Xi'an Thermal Engineering Research Institute Co., Ltd., Xi'an Shaanxi 710001, China;
4. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an Shaanxi 710065, China

Received:2024-10-06 Revised:2025-01-18 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 为提升火电锅炉水冷壁等受热面、脱硫系统脱硫循环泵以及除灰系统管道的耐磨损、耐冲蚀性能,采用超音速火焰(HVOF)喷涂与真空热处理相结合的方式在2205不锈钢表面制备了Ni25WC、Ni35WC两种涂层,研究了涂层的组织结构、物相,以及磨粒磨损、冲蚀磨损等关键性能。结果表明,热处理使得涂层内部硬质相与粘接相之间的结合程度增加,孔隙由片层状转变为球形,磨粒磨损过程中Ni25WC、Ni35WC涂层的硬质相均未发生剥落,磨损量分别为42、30 mg,低于2205不锈钢磨损量的4%;两种涂层均含有Ni、W₂C、Cr₃C₂和C等相;Ni25WC、Ni35WC涂层的硬度基本相同,均为2205不锈钢的3倍以上;冲蚀磨损过程中,砂子反复撞击表面导致硬质相剥落,造成两种涂层的耐冲蚀性能仅比2205不锈钢提升30%左右。综合磨粒磨损与冲蚀磨损结果,Ni35WC涂层性能优于Ni25WC涂层。

关键词: 超音速火焰喷涂, 真空热处理, Ni基WC涂层, 组织, 磨粒磨损, 冲蚀磨损

Abstract: To improve the wear resistance of the thermal power boiler water wall, desulfurization system desulfurization circulation pump and ash removal system pipeline, Ni25WC and Ni35WC coatings were deposited on the surface of 2205 stainless steel by high velocity oxygen fuel (HVOF) spraying and vacuum heat treatment. The microstructure and phase of the coatings, as well as the key properties, such as abrasive wear resistance and erosion wear resistance, were studied. The results show that heat treatment enhances the bonding between the hard phase and the adhesive phase, and the pores change from lamellar shape to spherical shape. The hard phases in Ni25WC and Ni35WC coatings do not flake off during abrasive wear test, and the wear mass loss of the Ni25WC and Ni35WC coatings are 42 mg and 30 mg, respectively, which less than 4% of the mass loss of 2205 stainless steel. Both coatings mainly contain Ni, W₂C, Cr₃C₂ and C. The hardness of Ni25WC and Ni35WC coatings is basically the same, both more than three times that of the 2205 stainless steel. During erosion wear test, the sand repeatedly impacts the surface, causing the hard phase peeling off. As a results, the erosion wear resistance of the two coatings is only about 30% higher than that of 2205 stainless steel. According to results of abrasive wear and erosion wear, the performance of Ni35WC coating is better than that of Ni25WC coating.

Key words: high velocity oxygen fuel, vacuum heat treatment, Ni-based WC coating, microstructure, abrasive wear, erosion wear

中图分类号:

TG146

刘军, 纪乙智, 李巍, 廖斌, 曹志刚, 黄修喜, 刘思晔, 董会. 真空热处理超音速火焰喷涂制备Ni基WC涂层的结构与耐磨性[J]. 金属热处理, 2025, 50(3): 284-290.

Liu Jun, Ji Yizhi, Li Wei, Liao Bin, Cao Zhigang, Huang Xiuxi, Liu Siye, Dong Hui. Microstructure and wear resistance of Ni-based WC coating prepared by HVOF spraying and vacuum heat treatment[J]. Heat Treatment of Metals, 2025, 50(3): 284-290.

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真空热处理超音速火焰喷涂制备Ni基WC涂层的结构与耐磨性

Microstructure and wear resistance of Ni-based WC coating prepared by HVOF spraying and vacuum heat treatment

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