针对马氏体不锈钢的表面耐磨性不能满足应用需求,且在钢基表面直接制备SiC涂层会产生与基体结合不良的问题,采用双辉等离子表面冶金技术在4Cr13马氏体不锈钢表面制备SiC/Ta复合涂层,对涂层的组织结构、表面硬度、结合强度和摩擦磨损性能进行研究.结果表明,所制备的SiC/Ta复合涂层厚5～6 μm,由SiC、Ta、Ta2C和TaC相构成.SiC/Ta/基体各层间以扩散连接,与基体结合良好.经双辉等离子表面冶金技术处理后,表面显微硬度由基材的279 HV0.2提高到1 738 HV0.2.4Cr13不锈钢的摩擦学性能也得到明显改善,摩擦因数比基材的平均摩擦因数降低了0.32,磨损率是基材磨损率的4％.
Surface wear resistance of martensitic stainless steel can't meet the application requirements,and the SiC coating prepared directly onto the steel surface has poor adhesion strength.To resolve the above problems,SiC/Ta composite coatings were prepared on 4Cr13 martensitic stainless steel surface using double glow plasma surface alloying technology (DG-PSA).The microstructure,surface hardness,adhesion strength and tribological properties of the SiC/Ta composite coating were investigated.The results indicate that SiC/Ta composite coating is mainly composed of SiC,Ta,Ta2C and TaC,and its thickness is 5-6 μm.The inter-diffusion regions existed at the SiC/Ta/substrate cause a superior adherence to the substrate.After the DG-PSA treatment,the surface microhardness of the substate improves from 279 HV0.2 to 1 738 HV0.2.The coefficient of friction of the SiC/Ta coated sample decreases about 0.32 and the wear rate of which is about 4％ of the untreated substrate showing a improve tribological properties.
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