ISSN   1004-0595

CN  62-1095/O4

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曹磊, 孙航, 万勇, 杨淑燕, 徐铁伟. 全合成机油润滑下热氧化改性TC4钛合金的摩擦学行为[J]. 摩擦学学报, 2019, 39(1): 17-25. DOI: 10.16078/j.tribology.2018122
引用本文: 曹磊, 孙航, 万勇, 杨淑燕, 徐铁伟. 全合成机油润滑下热氧化改性TC4钛合金的摩擦学行为[J]. 摩擦学学报, 2019, 39(1): 17-25. DOI: 10.16078/j.tribology.2018122
CAO Lei, SUN Hang, WAN Yong, YANG Shuyan, XU Tiewei. Tribological Behavior of Thermally Oxidized TC4 Titanium Alloy under Lubrication of a Full Formulated Engine Oil[J]. TRIBOLOGY, 2019, 39(1): 17-25. DOI: 10.16078/j.tribology.2018122
Citation: CAO Lei, SUN Hang, WAN Yong, YANG Shuyan, XU Tiewei. Tribological Behavior of Thermally Oxidized TC4 Titanium Alloy under Lubrication of a Full Formulated Engine Oil[J]. TRIBOLOGY, 2019, 39(1): 17-25. DOI: 10.16078/j.tribology.2018122

全合成机油润滑下热氧化改性TC4钛合金的摩擦学行为

Tribological Behavior of Thermally Oxidized TC4 Titanium Alloy under Lubrication of a Full Formulated Engine Oil

  • 摘要: 通过热氧化改性技术,在TC4钛合金表面制备金红石相TiO2氧化膜,利用XRD、拉曼、辉光光谱对氧化膜结构及成分进行了分析,利用摩擦磨损试验机考察了轻载(约1 GPa)与重载(约2 GPa)下热氧化改性前后TC4钛合金样品在5W-30全合成机油润滑下的摩擦学特性,并利用SEM和XPS对其磨损表面形貌及摩擦化学反应膜的化学成分进行了分析. 结果表明:热氧化改性后,TC4钛合金表面形成具有氧化层和扩散层的双层结构. 在油润滑条件下,与未处理的TC4钛合金表面相比,经过热氧化改性的TC4合金表现出优异的减摩抗磨性能,摩擦系数在轻载和重载条件下分别降低了75%和80%,磨损率均下降了近两个数量级. 其原因在于TC4合金热氧化改性后在表面形成的金红石相TiO2氧化膜提高了表面硬度,同时改善了润滑油在表面的润湿,并可促进润滑油中抗磨极压添加剂在接触区表面形成含磷的摩擦化学反应膜,从而极大地提高了摩擦学特性.

     

    Abstract: The TiO2 oxide film was prepared on the surface of TC4 titanium alloy by thermal oxidation treatment to improve the tribological properties under oil lubrication condition. The results was helpful to accumulate research data for the practical application of TC4 titanium alloy. In this work, the TC4 titanium alloy was thermally oxidized at 700 ℃ for 5 h in the air with a muffle furnace. The composition and structure of thermally oxidized TC4 titanium alloy was analyzed by X-ray diffraction, Raman and glow discharge spectrometry. The tribological properties of untreated and thermal oxidized treated TC4 titanium alloy was investigated under oil lubrication by UMT-3 at the loads of 10 N and 80 N. After test, the surface topography of wear tracks was observed by scanning electron microscopy and surface profiler instrument and composition was analyzed by X-ray photoelectron spectrometer. The friction-reducing and anti-wear mechanism was discussed. A dual-layer structure with an oxide layer on top of surface and an oxygen diffusion zone in the subsurface was fabricated on TC4 substrate after thermal oxidation treatment. As comparing with untreated TC4 samples, treated TC4 ones showed excellent tribological properties. In specific, the friction coefficients and wear rates of treated TC4 alloy were reduced. The rutile TiO2 on TC4 titanium alloy after thermally oxidized treatment increased surface hardness, improved the wettability and induced the formation of phosphate-containing tribofilm during rubbing process. Hence, the tribological performance was improved.

     

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