表面技术
錶麵技術
표면기술
Surface Technology
2015年
9期
13-17,55
,共6页
卢金斌%彭竹琴%马明星%李俊魁%齐振东%贺亚勋
盧金斌%彭竹琴%馬明星%李俊魁%齊振東%賀亞勛
로금빈%팽죽금%마명성%리준괴%제진동%하아훈
等离子合金化%高熵合金%显微硬度%复合涂层%σ相%铸铁
等離子閤金化%高熵閤金%顯微硬度%複閤塗層%σ相%鑄鐵
등리자합금화%고적합금%현미경도%복합도층%σ상%주철
plasma surface alloying%high-entropy alloys%microhardness%composite coating%σ phase%cast iron
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AlCoCrCuFexMnNiCx 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,Fe3 C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。
目的:通過等離子閤金化高熵閤金塗層,提高鑄鐵錶麵耐磨性。方法採用等離子閤金化法,以等摩爾比的Al,Co,Cr,Cu,Mn,Ni單質金屬粉在HT250鑄鐵錶麵製備高熵閤金複閤塗層。通過SEM, EDS,XRD等分析塗層的組織,測試塗層的顯微硬度分佈。結果由于鑄鐵基體少量鎔化,基體中的Fe和C元素進入塗層,形成瞭厚度約為0.2 mm的AlCoCrCuFexMnNiCx 高熵閤金塗層。從塗層錶麵到基材,體繫的混閤熵呈高熵-中熵-低熵的梯度變化。塗層主要由高熵閤金的枝晶和枝晶間滲碳體、σ相等組織構成,主要有FCC,BCC,Fe3 C及σ相。塗層的顯微硬度大約為350~600HV0.2,明顯高于鑄鐵基體的硬度(200~230HV0.2)。結論通過等離子閤金化可以在鑄鐵錶麵形成高熵閤金+碳化物的複閤塗層,提高瞭鑄鐵的顯微硬度,有利于鑄鐵錶麵耐磨性的提高。
목적:통과등리자합금화고적합금도층,제고주철표면내마성。방법채용등리자합금화법,이등마이비적Al,Co,Cr,Cu,Mn,Ni단질금속분재HT250주철표면제비고적합금복합도층。통과SEM, EDS,XRD등분석도층적조직,측시도층적현미경도분포。결과유우주철기체소량용화,기체중적Fe화C원소진입도층,형성료후도약위0.2 mm적AlCoCrCuFexMnNiCx 고적합금도층。종도층표면도기재,체계적혼합적정고적-중적-저적적제도변화。도층주요유고적합금적지정화지정간삼탄체、σ상등조직구성,주요유FCC,BCC,Fe3 C급σ상。도층적현미경도대약위350~600HV0.2,명현고우주철기체적경도(200~230HV0.2)。결론통과등리자합금화가이재주철표면형성고적합금+탄화물적복합도층,제고료주철적현미경도,유리우주철표면내마성적제고。
Objective To improve the abrasion resistance of the surface on cast iron by plasma alloying high entropy alloy coat-ing 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 micro-hardness 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 andσphase 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.