大气等离子喷涂NiCr/Cr3C2复合涂层的性能

doi:10.13251/j.issn.0254-6051.2020.12.035

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 179-183.DOI: 10.13251/j.issn.0254-6051.2020.12.035

大气等离子喷涂NiCr/Cr₃C₂复合涂层的性能

曹玉霞^1,2, 刘进强², 孙景卫³, 王志林¹, 赵文武^1,2, 郝斌^1,2

1.唐山学院环境与化学工程系, 河北唐山 063000;
2.唐山市微纳米材料制备及应用重点实验室, 河北唐山 063000;
3.唐山建苑建设工程材料检测有限公司, 河北唐山 063000

收稿日期:2020-05-29 出版日期:2020-12-25 发布日期:2021-01-14
作者简介:曹玉霞(1980—),女,副教授,博士,主要研究方向为涂层材料,E-mail:caoyuxia_416@126.com
基金资助:
河北省自然科学基金(E2015105068); 河北省科技计划(17211028); 河北省高等学校教育科学研究项目(Z2017054); 唐山市科技计划(17110216a)

Properties of atmospheric plasma-sprayed NiCr/Cr₃C₂ composite coating

Cao Yuxia^1,2, Liu Jinqiang², Sun Jingwei³, Wang Zhilin¹, Zhao Wenwu^1,2, Hao Bin^1,2

1. Department of Environmental and Chemical Engineering, Tangshan College, Tangshan Hebei 063000, China;
2. Key Laboratory of Micro-nano-Material Preparation and Application of Tangshan, Tangshan Hebei 063000, China;
3. Tangshan Jianyuan Construction Engineering Material Testing Co., Ltd., Tangshan Hebei 063000, China

Received:2020-05-29 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 采用化工冶金包覆、固相合金化和喷雾造粒技术制备了NiCr/Cr₃C₂复合粉体,并采用大气等离子喷涂技术制备了NiCr/Cr₃C₂复合涂层,采用SEM、显微硬度计、万能试验机和马弗炉对粉体和涂层的显微结构、涂层的显微硬度、结合强度和氧化性能进行了分析。结果显示:NiCr/Cr₃C₂涂层呈典型的层状结构,各层间结合良好,结合强度为(27.4±5) MPa,涂层显微硬度约850 HV0.2,为结合层显微硬度的2.7倍,涂层为典型的脆性断裂,断裂的位置发生在涂层的层与层之间。NiCr/Cr₃C₂涂层850 ℃氧化动力学曲线基本符合抛物线氧化规律。在氧化过程中涂层表面生产了氧化膜,且氧化膜会发生脱落,同时涂层内部出现了偏析现象,析出了金属Cr。

关键词: NiCr/Cr₃C₂复合涂层, 力学性能, 氧化性能, 大气等离子喷涂

Abstract: NiCr/Cr₃C₂ composite powder was prepared by chemical and metallurgical coating, solid state alloying and spray granulation technology, and the NiCr/Cr₃C₂composite coating was prepared by atmospheric plasma spraying technology (APS). The microstructure of both the powder and the coating, as well as the microhardness, tensile strength and oxidation property of the coating were studied by using SEM, microhardness tester, universal mechanical tester and muffle furnace. The results show that the coating has a typical layered structure with excellent tensile strength (27.4±5) MPa. The microhardness of the coating is about 850 HV0.2, which is 2.7 times of that of bonding layer. The fracture of the coating is a typical brittle fracture, and occurs between the layers in the coating. The oxidation kinetics curve of the coating at 850 ℃ basically conforms to the parabola law, and the oxide film is produced on the surface of the coating, and will fall off during the oxidation process. At the same time, the segregation phenomenon appears in the coating, and the metal Cr is precipitated.

Key words: NiCr/Cr₃C₂ composite coating, mechanical properties, oxidation property, atmospheric plasma spraying

中图分类号:

TG174.453

曹玉霞, 刘进强, 孙景卫, 王志林, 赵文武, 郝斌. 大气等离子喷涂NiCr/Cr₃C₂复合涂层的性能[J]. 金属热处理, 2020, 45(12): 179-183.

Cao Yuxia, Liu Jinqiang, Sun Jingwei, Wang Zhilin, Zhao Wenwu, Hao Bin. Properties of atmospheric plasma-sprayed NiCr/Cr₃C₂ composite coating[J]. Heat Treatment of Metals, 2020, 45(12): 179-183.

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大气等离子喷涂NiCr/Cr₃C₂复合涂层的性能

Properties of atmospheric plasma-sprayed NiCr/Cr₃C₂ composite coating

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