摘要
目的通过等离子合金化高熵合金涂层,提高铸铁表面耐磨性。方法采用等离子合金化法,以等摩尔比的Al,Co,Cr,Cu,Mn,Ni单质金属粉在HT250铸铁表面制备高熵合金复合涂层。通过SEM,EDS,XRD等分析涂层的组织,测试涂层的显微硬度分布。结果由于铸铁基体少量熔化,基体中的Fe和C元素进入涂层,形成了厚度约为0.2 mm的Al Co Cr Cu FexMn Ni Cx高熵合金涂层。从涂层表面到基材,体系的混合熵呈高熵-中熵-低熵的梯度变化。涂层主要由高熵合金的枝晶和枝晶间渗碳体、σ相等组织构成,主要有FCC,BCC,Fe3C及σ相。涂层的显微硬度大约为350~600HV0.2,明显高于铸铁基体的硬度（200~230HV0.2）。结论通过等离子合金化可以在铸铁表面形成高熵合金＋碳化物的复合涂层,提高了铸铁的显微硬度,有利于铸铁表面耐磨性的提高。
Objective To improve the abrasion resistance of the surface on cast iron by plasma alloying high entropy alloy coating process. Methods High entropy alloy coating was prepared on the surface of HT250 cast iron by plasma alloying Al,Co,Cr,Cu,Mn and Ni powders in equal molar ratio. The microstructure of the coating was studied by SEM,EDS,XRD,and its microhardness distribution was tested by the microhardness tester. Results Due to melting of a small amount of iron,the atoms such as Fe and C dissolved into the coating to get AlCoCrCuFexMnNiCx,the thickness of which was about 0. 2 mm. The mixing entropy of both the composition and the microstructure of the coating distributed in a high-medium-low gradient. The microstructure of the coating was mainly composed of high-entropy alloy dendrite and interdendrite cementite and σ phase etc,and the coating contained mainly FCC,BCC,Fe3 C and σ phase. The microhardness of the coating was about 350 ~ 600HV0. 2,which was significantly higher than that of the matrix（ 200 ~ 230HV0. 2）. Conclusion The composite coating including high entropy alloy and carbide could be formed on the surface of cast iron by plasma alloying,which improved the microhardness of the cast iron,and thus helped to improve the abrasion resistance of the surface on cast iron.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2015年第9期13-17,55,共6页
Surface Technology
基金
河南省基础与前沿技术研究项目(072300440020)~~
关键词
等离子合金化
高熵合金
显微硬度
复合涂层
Σ相
铸铁
plasma Surface alloying
high-entropy alloys
microhardness
composite coating
σ phase
cast iron
作者简介
卢金斌（1970-），男，山西人，博士，副教授，主要从事金属材料表面处理及钎焊方面的教学与研究。
