Ultralow Friction and Wear Properties of TiAlN Coatings Lubricated by Glycerol

FU Xiaojing, LI Ruichuan, GAO Jianguo, SUN Huilai, WAN Yong

China Surface Engineering ›› 2021, Vol. 34 ›› Issue (5) : 198-205.

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China Surface Engineering ›› 2021, Vol. 34 ›› Issue (5) : 198-205. DOI: 10.11933/j.issn.1007-9289.20210612001

Ultralow Friction and Wear Properties of TiAlN Coatings Lubricated by Glycerol

  • FU Xiaojing, LI Ruichuan, GAO Jianguo, SUN Huilai, WAN Yong
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Abstract

TiAlN coating has found a wide application in the tool field as its excellent mechanical properties. However, more research is still needed to optimize the processing parameters to enhance mechanical properties of TiAlN coating. Moreover, it is urgent to develop green lubricants which are compatible with TiAlN coating. Based on magnetron sputtering technology, the effect of Al target sputtering current on the microstructure and mechanical properties of TiAlN coatings was studied, and the tribological properties of TiAlN coatings under glycerol lubrication conditions were evaluated. The action mechanism of glycerol on TiAlN coating was explored by using X-ray photoelectron spectroscopy. The results showed that TiAlN-3A coating obtained at 3 A has the densest crystalline structure and the best mechanical properties. The friction coefficient of TiAlN-3A coating was only 0. 007, and its wear rate was 2. 62 ×10-6 mm3N-1m-1 under lubrication of glycerol. XPS analysis indicated that the degradation reaction of glycerol occurred during the sliding of the steel ball against the TiAlN coating, and a new product FeOOH was formed on the surface. Due to the hydrophilicity of FeOOH, glycerol molecules and its degradation products were adsorbed on the surface of the contact area to form a fluid lubricant layer, providing excellent friction-reducing and wear resistant properties.

Key words

TiAlN coating; magnetron sputtering; glycerol lubrication; friction degradation; fluid lubrication layer

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FU Xiaojing, LI Ruichuan, GAO Jianguo, SUN Huilai, WAN Yong. Ultralow Friction and Wear Properties of TiAlN Coatings Lubricated by Glycerol[J]. China Surface Engineering, 2021, 34(5): 198-205 https://doi.org/10.11933/j.issn.1007-9289.20210612001

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Funding

Supported by National Natural Science Foundation of China ( 51975304 ), Natural Science Foundation of Shandong Province (ZR2019MEE016),and Strong Industrial Foundation Project in 2018(TC180A3Y1).
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