【摘要】 通过对TC4钛合金进行盐浴硼氧共渗试验,比较分析几种盐浴硼氧共渗剂。采用扫描电子显微镜（SEM）及其配备的能谱仪（EDS）,X射线衍射仪（XRD）,观察渗层表面形貌和物相,用维氏硬度计测量渗层表面显微硬度,测试与YG6球在干摩擦磨损条件下的摩擦磨损性能,并采用化学热力学分析盐浴硼氧共渗机理。结果表明单一硼砂型（Na₂B₄O₇）共渗效果不理想,表面组织疏松,显微硬度为584.7HV;硼砂—铝粉型渗层表面组织呈块状和球形颗粒状,主要由TiB₂、TiB₁₂、Ti₂B5_、Ti3Al和TiO₂相组成,表面显微硬度提高了71.5%（631.8HV）,有一定的共渗效果;硼砂—碳化硅型渗层表面组织均匀,主要有TiB₁₂、Ti₂B₅、TiB₂₅、TiO₂和TiC相,表面显微硬度提高了84.1%（677.4HV）,共渗效果显著;氯化钠—氧化硼—碳化硼型渗层表面组织致密,有团聚现象,主要有TiB、TiB₂、TiB12、TiO₂和TiC相,表面显微硬度提高了80.1%（664.9HV）,共渗效果明显。组分盐浴硼氧共渗可以显著改善TC4钛合金的耐磨性能。更多还原

【Abstract】 Salt bath oxygen-boriding on TC₄ titanium alloy was conducted using different oxygen-boriding agents. Microstructure,composition and phases of the oxygen-borided coating were investigated by means of scanning electron microscopy（ SEM）,energy dispersive spectrometer（ EDS） analysis and X-ray diffraction（ XRD）. The surface microhardness of the samples was measured with Vickers hardness tester,the tribological properties of the samples to YG6 were examined under dry lubrication,and the salt-bath oxygenboriding mechanism was analyzed using the chemical thermodynamics. The results show that the Na₂B₄O₇ borided sample has loose microstructure and the surface microhardness is 584. 7 HV. The surface microstructure of Na₂B₄O₇-Al borided sample is block-shaped and spherical particle,and is mainly composed of Ti B₂,Ti B₁₂,Ti₂B₅,Ti₃ Al and Ti O2 phases. The surface microhardness increases to 631. 8HV. The surface microstructure of Na₂B₄O₇-Si C borided sample is uniform,and is mainly composed of Ti B₁₂,Ti₂B₅,Ti B₂₅,Ti O₂ and Ti C phases. The surface microhardness increases to 677. 4 HV. The surface microstructure of Na Cl-B2O3-B4 C borided sample is dense,and is mainly composed of Ti B,Ti B₂,Ti B₁₂,Ti O)2 and Ti C phases. The surface microhardness is 664. 9 HV. The wear resistance of TC₄ titanium alloy can be improved by salt bath oxygen-boriding.更多还原