冷喷涂铁基非晶复合涂层的制备、微观组织及摩擦性能  

Preparation, Microstructure and Friction properties of Cold Sprayed Fe-based Amorphous Composite Coating

作　　者：李旭 王强[1,2] 毛轩 牛文娟 王璐 李楠[1,2] 韩鹏 Li Xu;Wang Qiang;Mao Xuan;Niu Wenjuan;Wang Lu;Li Nan;Han Peng(College of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Engineering Research Center of Metallurgical,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西安建筑科技大学陕西省冶金工程技术研究中心,陕西西安710055

出　　处：《稀有金属材料与工程》2021年第6期2186-2193,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51801143);陕西省自然科学基金(2017JZ012);陕西省教育厅专项(18JK0445)。

摘　　要：采用液氮-室温循环深冷处理工艺方法对Fe87.4Cr_(2).5Si6.8B_(2).4C0.9非晶合金粉末进行预处理,通过调控冷喷涂工艺参数,成功在6061铝合金基体表面制备非晶涂层。同时研究了深冷处理工艺对非晶粉末沉积行为以及涂层微观组织的影响机理,通过摩擦磨损试验研究非晶合金涂层的摩擦磨损性能。结果表明:使用原始非晶粉末制备得到的涂层厚度仅为6μm,且非晶颗粒在基体表面不连续分布,只有粒径较小的非晶颗粒可发生有效的塑性变形,但是粉末沉积过程中晶化率较低;使用经过深冷预处理的非晶粉末制备的涂层平均厚度为67μm,且涂层内非晶合金颗粒分布均匀,粒径较大的非晶颗粒也可发生有效塑性变形,但是粉末沉积过程中晶化率较高。在摩擦磨损过程中6061铝合金基体的主要磨损机制为粘着磨损与疲劳磨损,非晶涂层的主要磨损机制为磨粒磨损,且使用原始非晶粉末和循环深冷处理粉末制备得到的非晶涂层的质量磨损量较低,分别为6061铝合金基体质量磨损量的15.7%、11.8%。Fe87.4 Cr_(2).5 Si6.8 B_(2).4 C0.9 amorphous alloy powder was pretreated by the liquid nitrogen-room temperature cyclic cryogenic treatment method and the amorphous coating was prepared on the 6061 aluminum alloy substrate surface by adjusting the technological parameters of cold spraying. The influence mechanism of cryogenic treatment on the deposition behavior of amorphous powder and the microstructure of coating were studied. The frictional wear property of the amorphous coating was investigated by friction-wear test. The results show that the thickness of coating prepared by original amorphous powder is only 6 μm, and the amorphous particles are discontinuously distributed on the surface of the substrate. Only the amorphous particles with smaller particle size can have effective plastic deformation, but the crystallization rate is low during the deposition of the powder. The average thickness of the coating prepared by cryogenic treated amorphous powder is 67 μm, and the amorphous alloy particles in the coating are uniformly distributed. The amorphous particles with larger particle size can also undergo effective plastic deformation, but the crystallization rate is higher during the powder deposition. The main wear mechanism of 6061 aluminum alloy substrate in the process of friction and wear is adhesive wear and fatigue wear, and the main wear mechanism of amorphous coating is abrasive wear. The wear mass loss of the amorphous coating prepared by the original amorphous powder and the cyclic cryogenic treated powder is 15.7% and 11.8% of that of the 6061 aluminum alloy substrate, respectively.

关 键 词：冷喷涂 循环深冷处理 非晶涂层 晶化率 摩擦磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]