振动助渗制备45钢表面铝化物涂层及其抗高温氧化性能  

Preparation of Aluminide Coating on 45 Steel by Vibration Assisted Infiltration and Its High-temperature Oxidation Resistance

作　　者：孟堃 詹肇麟[2] 王远 王伟 于晓华[3] 荣菊[4] MENG Kun;ZHAN Zhaolin;WANG Yuan;WANG Wei;YU Xiaohua;RONG Ju(Faculty of Mechanical and Manufacturing Engineering,Southwest Forestry University,Kunming 650224;Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093;National Engineering Research Center of Solid Waste Resource,Kunming University of Science and Technology, Kunming 650093;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016)

机构地区：[1]西南林业大学机械与制造工程学院,昆明650224 [2]昆明理工大学材料科学与工程学院,昆明650093 [3]昆明理工大学固体废弃物资源化国家工程研究中心,昆明650093 [4]中国科学院金属研究所,沈阳110016

出　　处：《材料导报》2018年第16期2865-2869,2875,共6页Materials Reports

基　　金：云南省教育厅科学研究基金研究生项目(2017YJS090);国家自然科学基金(51301144);西南林业大学博士科研启动基金(111613);云南八大重点产业品牌专业建设基金(51600631)

摘　　要：为降低渗铝温度以细化晶粒和提高45钢表面的抗高温氧化性能,采用振动助渗在其表面制备纳米结构铝化物涂层。采用X射线衍射仪分析涂层的相组成,采用扫描电子显微镜和原子力显微镜观察涂层的微观组织结构,采用能量色散光谱仪分析涂层微区化学成分,采用划痕仪检测涂层与基体的结合强度。结果表明:铝化物涂层主要由η-Fe_2Al_5和少量θ-FeAl_3相组成,且其具有单层、致密及均匀特性。120min振动助渗下形成的铝化物涂层表面呈现出凹坑和丘陵状两种典型纳米结构区域,且距表面越远,涂层的纳米晶越粗大;垂直加载载荷68N时出现噪声信号,涂层开始发生破损;涂层抗氧化试验中的氧化增重量和剥落量仅为未表面涂层处理45钢试样的1/60和1/160,说明铝化物涂层显著增强了45钢表面抗高温氧化的能力。In order to reduce the aluminizing temperature to refine grain and improve the high-temperature oxidation resistance of 45 steel surface,nanostructured aluminide coating was prepared on the surface by vibration assisted infiltration.The phase composition of the coating was analyzed by X-ray diffractometer.The microstructure of the coating was observed by scanning electron microscopy and atomic force microscopy.The chemical composition of the coating was analyzed by energy dispersive spectrometer.The bond strength between coating and substrate was measured by scratch tester.The results show that the aluminide coating is mainly composed ofη-Fe 2Al 5 and a small amount ofθ-FeAl 3 phases,and having single,dense and uniform characteristics.At 120 min,the surface of the aluminide coating formed by vibration assisted infiltration has two typical nanostructure regions of pits and hills,the longer the distance from the surface,the larger the nanocrystalline of the coating.When the load is perpendicular to 68 N,the noise signal appears,and the coating is damaged.The oxidation weight gain and spalling capacity of the coating in the oxidation resistance test are only 1/60 and 1/160 of the 45 steel sample treated with the less surface coating,that is,the aluminide coating remarkably enhances the ability of the 45 steel surface to resist high temperature oxidation.

关 键 词：45钢 振动助渗 铝化物涂层 抗高温氧化 

分 类 号：TG174[金属学及工艺—金属表面处理]