爆炸喷涂Cr3C2-25NiCr涂层的微观结构及性能

为了使Cr_3C_2-NiCr涂层能够应用于水力机械表面,采用爆炸喷涂技术在0Cr13Ni4Mo不锈钢基材表面制备了Cr_3C_2-25NiCr涂层,通过扫描电镜(SEM)、X射线衍射仪(XRD)、金相分析仪、拉伸试验机、显微硬度计、摩擦磨损试验机、电化学工作站等手段研究分析了该涂层的微观形貌、孔隙率、结合强度、显微硬度、耐磨性能、耐蚀性能等。结果表明:爆炸喷涂Cr_3C_2-25NiCr涂层具有高致密结构,平均孔隙率仅为0. 76%,并且其结合强度高达82 MPa;涂层平均显微硬度为1 026 HV2 N,远高于基体;且在相同试验条件下,涂层的磨损量仅为基体的1/72;同时涂层还具有远高于基体的耐腐蚀性能。

Microstructure and Properties of Cr_3C_2-25NiCr Coatings Prepared by Detonation Spraying

In order to enable the Cr3C2-NiCr coatings applicable to hydraulic machinery surface,Cr3C2-25NiCr coatings were prepared on0 Cr13 Ni4 Mo stainless steel by detonation spraying method. The microstructure,porosity,bond stress,micro-hardness,wear resistance and corrosion resistance of coatings were analyzed by scanning electron microscope( SEM),X-ray diffractometer( XRD),metallographic analyzer,adhesion testing machine,micro-hardness measurement,tribometer and electrochemical workstation. Results showed that the detonation spraying Cr3C2-25 NiCr coating possessed the high-density structure with only 0.76% of average porosity,and the binding strength reached82 MPa. The average microhardness of the coatings was 1 026 HV2 N,much higher than that of the substrate. Meanwhile,the abrasion loss of the coatings was only 1/72 of that of the substrate under the same test condition,and the coatings had much higher corrosion resistance than the substrate.