超音速火焰喷涂制备CrC-NiCr耐磨涂层试验研究

利用超音速火焰(HVOF)喷涂技术在St T16/25Mo合金表面成功制备了Cr3C2-NiCr耐磨涂层,获得了制备Cr3C2-NiCr耐磨涂层的工艺参数。结果表明:Cr3C2-NiCr涂层致密、孔隙率很低、显微硬度和结合强度较高,具有优异的耐高温、耐磨、耐蚀和抗氧化性能,涂层厚度等各项指标均符合技术文件的要求;采用的HVOF喷涂工艺参数合理,Cr3C2-NiCr涂层可应用于阀杆、阀头和导套等关键零部件的生产中。

Experimental Study on Cr3C2-NiCr Wear-resistant Coating Prepared by HVOF Spraying

To obtain the process parameters in preparation of Cr3C2-NiCr wear-resistant coating on the surface of St T16/25Mo alloy,the coating was successfully prepared by high-velocity oxygen-fuel(HVOF)spraying.Results show that the structure of Cr3C2-NiCr coating is compact,with low porosity,high micro hardness and bonding strength.The coating is expected to have excellent high-temperature resistance,corrosion/wear resistance and oxidation resistance,with thickness meeting relevant standard,proving the HVOF spraying process parameters to be reasonable.Therefore the Cr3C2-NiCr coating may be applied in the production of following key components,such as valve stems,valve heads and guide bushings.