The research on the high strength and anti-arc ablation coatings applied in steel conductive rail

High-speed Railway Pub Date : 2023-09-01 DOI:10.1016/j.hspr.2023.08.002

Yihu Ma , Wenbo Yu , Chaosheng Ma , Guozheng Ma

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Abstract

In order to enhance the ablation-resistant performance of stainless-steel conductive rails, Mo coating, 410 stainless steel coating and 15 wt% Cr₂AlC particles reinforced 410 stainless steel composite coating were prepared and evaluated. Different from the weak interfacial strength caused by the dissimilar metals between Mo and steel rails, 410 stainless steel coating has better interfacial contact with steel rails. The introduction of Cr₂AlC into 410 stainless steels further strengthened the mechanical properties of coating by alloy strengthening effect and particle strengthening effect, as the decomposition of Cr₂AlC into nano CrC particles is accompanied with the diffusion of Al atoms into 410 stainless steels. It was found that the composite coating can still resist arc erosion at 150 A current, as a dense oxide film formed during the ablation process and the decomposition of Cr₂AlC contributed to the heat absorption.

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钢轨用高强度抗电弧烧蚀涂层的研究

为了提高不锈钢导电轨的耐烧蚀性能，制备了Mo涂层、410不锈钢涂层和15wt % Cr2AlC颗粒增强410不锈钢复合涂层，并对其性能进行了评价。不同于钼与钢轨之间金属异种所造成的界面强度较弱，410不锈钢涂层与钢轨的界面接触较好。在410不锈钢中加入Cr2AlC，由于Cr2AlC分解成纳米CrC颗粒的同时伴随着Al原子向410不锈钢中的扩散，通过合金强化效应和颗粒强化效应进一步强化了涂层的力学性能。结果表明，复合涂层在150 A电流下仍能抵抗电弧侵蚀，这是由于烧蚀过程中形成的致密氧化膜和Cr2AlC的分解有助于吸收热量。

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High-speed Railway

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