引用本文:王大锋,马冰,陈东高,马良超,刘红伟,吴进明.WC晶体结构特征对HVOF喷涂纳米结构WC-CoCr涂层组织及性能的影响[J].中国表面工程,2019,32(1):88~97
WANG Dafeng,MA Bing,CHEN Donggao,MA Liangchao,LIU Hongwei,WU Jinming.Effects of WC Crystal Characteristics on Microstructure and Mechanical Property of HVOF-sprayed WC-CoCr Coatings[J].China Surface Engineering,2019,32(1):88~97
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WC晶体结构特征对HVOF喷涂纳米结构WC-CoCr涂层组织及性能的影响
王大锋1,2, 马冰1, 陈东高1, 马良超1, 刘红伟1, 吴进明2
1.中国兵器科学研究院宁波分院 焊接与表面再制造研究所, 宁波 315103;2.浙江大学 材料科学与工程学院, 杭州 310027
摘要:
为提高纳米结构WC-CoCr涂层的综合力学性能，采用超音速火焰喷涂（HVOF）工艺制备纳米结构和超细结构WC-CoCr涂层。探讨了不同晶体特征的WC粉末对颗粒飞行和沉积变形过程的脱碳行为、涂层微观组织及力学性能的影响。结果表明：含有高密度位错的超细WC粉末在喷涂过程中发生了严重的氧化脱碳，形成了大量的W2C相，涂层孔隙率较大，断裂韧性显著降低。而含有显著孪晶的纳米WC颗粒具有抑制WC脱碳和增强涂层断裂韧性的作用，纳米结构涂层呈现低脱碳率、高致密性、高硬度和高断裂韧性的优良综合性能。
关键词:  WC-CoCr涂层  WC晶体结构特征  超音速火焰喷涂  脱碳机理
DOI：10.11933/j.issn.1007-9289.20181128002
分类号:TG174.442
基金项目:宁波市自然科学基金（2018A610169）；内蒙古自然科学基金（2018BS05008）；国防基础科研项目（JCKY2017208C006）
Effects of WC Crystal Characteristics on Microstructure and Mechanical Property of HVOF-sprayed WC-CoCr Coatings
WANG Dafeng1,2, MA Bing1, CHEN Donggao1, MA Liangchao1, LIU Hongwei1, WU Jinming2
1.Institute of Welding and Remanufacturing, Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315103, China;2.School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Abstract:
To improve the integrated mechanical properties of nanostructured WC-CoCr coating, WC-CoCr coatings were fabricated by a high velocity oxygen-fuel (HVOF) spraying system from two agglomerated powders with different crystal characteristics. The effects of WC crystal characteristics on decarburization of WC during the in-flight and coating formation stage, microstructure and mechanical properties of coatings were systematically investigated. The results show that ultrafine WC grains with higher density dislocation dramatically decompose into W2C during spraying, resulting in the coating with higher porosity and lower fracture toughness. However, nano-scale WC grains with apparent twin have good inhibitory effect on decarburization of WC and significantly enhance the fracture toughness of the coating. Thus, the nanostructured coating exhibits the best comprehensive properties with low decarburization, low porosity, superior microhardness and fracture toughness.
Key words:  WC-CoCr coatings  WC crystal characteristics  high velocity oxygen-fuel spraying  decarburization mechanism
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