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采用等离子熔覆技术,以Zr、Fe、B_4C混合粉末为原料,在Q235低碳钢表面原位反应合成了ZrB_2和ZrC增强的Fe基复合涂层,分析了ZrB_2-ZrC/Fe涂层的物相组成和组织结构,并进行了硬度、耐磨性对比试验,探讨了物相和组织结构的形成过程及磨损机制。结果表明:涂层主要物相为ZrB_2、α-Fe、ZrC、Fe_2B和Fe_3C,其中ZrB_2呈现针棒状、花瓣状,ZrC呈现规则的颗粒状;随着原始粉末中(Zr+B_4C)含量的增加,增强相ZrB_2和ZrC含量增多,尺寸变大,ZrB_2-ZrC/Fe涂层与Q235钢基体之间结合紧密,呈冶金结合;与Q235钢基体相比,ZrB_2-ZrC/Fe涂层耐磨性显著提高,最高可达基体的5.45倍,ZrB_2-ZrC/Fe涂层的磨损方式以磨粒磨损为主,断裂方式以穿晶断裂为主。
The ZrB_2 and ZrC reinforced Fe-based composite coatings were synthesized by in-situ reaction on the surface of Q235 mild steel with plasma cladding technology using Zr, Fe and B_4C mixed powders as raw materials. The effects of ZrB_2-ZrC / Fe coatings Phase composition and organizational structure, and hardness, wear resistance comparison test to explore the phase and organization of the formation process and wear mechanism. The results showed that the main phases of the coatings were ZrB 2, α-Fe, ZrC, Fe 2 B and Fe 3 C, in which ZrB 2 showed pin-bar shape, petal-like shape and ZrC showed regular granular morphology. With the increase of (Zr + B 4 C) , ZrB 2 -ZrC / Fe coating and Q235 steel matrix are closely bonded and metallurgical bond with ZrB 2 -ZrC / Fe coatings. Compared with Q235 steel matrix, the wear resistance of ZrB 2 -ZrC / Fe coating Significantly increased up to 5.45 times that of the matrix. The wear mode of the ZrB_2-ZrC / Fe coating is abrasive wear, and the fracture mode is mainly transgranular fracture.