WC粉末粒度对超音速火焰喷涂WC-CoCr涂层组织性能的影响
发布时间：2018-10-22 13:52
【摘要】：采用超音速火焰喷涂(HVOF)工艺制备了纳米结构、双峰结构和常规结构3种WC-CoCr复合涂层。探讨了不同WC粉末粒度对涂层沉积过程的脱碳行为、涂层微观组织及力学性能的影响。结果表明:随WC颗粒尺寸减小,涂层脱碳率增大,W_2C含量增加,孔隙率降低,涂层的显微硬度和界面结合强度增大;但是纳米结构涂层中粘结相的非晶化现象严重,断裂韧度显著下降;双峰结构涂层因纳米、亚微米WC颗粒的合理搭配和协同效应表现出最好的断裂韧性,同时兼具较高的显微硬度和界面结合强度。
[Abstract]:Three kinds of WC-CoCr composite coatings, nanostructure, bimodal structure and conventional structure, were prepared by supersonic flame spraying (HVOF) process. The effects of different particle sizes of WC powder on the decarburization behavior, microstructure and mechanical properties of the coating were investigated. The results show that with the decrease of WC particle size, the decarburization rate increases, the WSCC content increases, the porosity decreases, the microhardness and the interface bonding strength increase, but the amorphous phase in the nanostructured coating increases. The bimodal structure coating shows the best fracture toughness due to the reasonable collocation and synergistic effect of nanometers and submicron WC particles as well as high microhardness and interfacial bonding strength.
【作者单位】： 北京科技大学材料科学与工程学院;北京矿冶研究总院北矿新材科技有限公司;
【基金】：国家自然科学基金资助项目(51001117) 北京矿冶研究总院产品开发基金项目(YJZ201404)
【分类号】：TG174.4
，
本文编号：2287332
[Abstract]:Three kinds of WC-CoCr composite coatings, nanostructure, bimodal structure and conventional structure, were prepared by supersonic flame spraying (HVOF) process. The effects of different particle sizes of WC powder on the decarburization behavior, microstructure and mechanical properties of the coating were investigated. The results show that with the decrease of WC particle size, the decarburization rate increases, the WSCC content increases, the porosity decreases, the microhardness and the interface bonding strength increase, but the amorphous phase in the nanostructured coating increases. The bimodal structure coating shows the best fracture toughness due to the reasonable collocation and synergistic effect of nanometers and submicron WC particles as well as high microhardness and interfacial bonding strength.
【作者单位】： 北京科技大学材料科学与工程学院;北京矿冶研究总院北矿新材科技有限公司;
【基金】：国家自然科学基金资助项目(51001117) 北京矿冶研究总院产品开发基金项目(YJZ201404)
【分类号】：TG174.4
，
本文编号：2287332
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