WS<sub>2</sub>含量对钛合金激光熔覆自润滑耐磨复合涂层的影响

以NiCr/Cr3C2-10%WS2、NiCr/Cr3C2-20%WS2、NiCr/Cr3C2-30%WS2合金粉末为原料, 采用激光熔覆技术在Ti-6Al-4V合金表面制备了γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS复合涂层。采用 X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相和显微组织。结果表明: 激光熔覆的复合涂层与基体呈冶金结合, γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS复合涂层主要由硬质TiC和TiWC2为耐磨增强相、γ-NiCrAlTi为增韧相、Ti2CS 和 CrS金属硫化物为自润滑相的自润滑耐磨复合涂层。随着固体润滑剂WS2添加含量的增加, γ-NiCrAlTi/TiC+TiWC2/Ti2CS+CrS涂层中的金属硫化物体积分数明显增加, 复合涂层的磨损率逐渐降低, 复合涂层自润滑耐磨性能明显增强。

Abstract

The NiCr/Cr3C2-10%WS2、NiCr/Cr3C2-20%WS2 and NiCr/Cr3C2-30%WS2are used as alloy powders preplaced on the Ti6Al4V, then the γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS self-lubrication wear resistant composite coatings were fabricated by laser cladding technology. The constituents and microstructure of the fabricated coatings were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy(EDS)techniques. The results show that the bonding of the coatings to the substrates is completely metallurgical. The microstructure of the composite coating is consisted of TiC and TiWC2carbides, self-lubricating Ti2CS and CrS sulfides. With the increase of the addition of solid lubrication WS2, the content of Ti2CS and CrS is increased which lead to the decrease of wear rate of the composite coating. The self-lubricating wear resistant ability of the composite coating is improved.

参考文献

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吴少华, 石皋莲, 刘海青, 段业宽, 孟祥军, 刘秀波. WS₂含量对钛合金激光熔覆自润滑耐磨复合涂层的影响[J]. 应用激光, 2014, 34(2): 95. WU Shaohua, SHI Gaolian, Liu Haiqing, Duan Yekuan, Meng Xiangjun, Liu Xiubo. Effect of Different Addition of WS₂ on Laser Clad Self-Lubrication Anti-Wear Composite Coatings on Titanium Alloy[J]. APPLIED LASER, 2014, 34(2): 95.

WS₂含量对钛合金激光熔覆自润滑耐磨复合涂层的影响

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