| YAO Qian-qian,GOU Hai-long,JIA Jun-hong,CHEN Ti-jun,SHI Pei-ying,LU Cheng,YANG Jie.Tribological Properties and Lubrication Mechanisms of Plasma Sprayed NiAl-MoO3/BaO Composite Coatings at High Temperature[J],49(11):93-100 |
| Tribological Properties and Lubrication Mechanisms of Plasma Sprayed NiAl-MoO3/BaO Composite Coatings at High Temperature |
| Received:April 03, 2020 Revised:May 15, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.11.011 |
| KeyWord:plasma spray coating oxide high temperature lubrication tribo-chemical reaction |
| Author | Institution |
| YAO Qian-qian |
School of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou , China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| GOU Hai-long |
School of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou , China |
| JIA Jun-hong |
School of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| CHEN Ti-jun |
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou , China |
| SHI Pei-ying |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LU Cheng |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| YANG Jie |
School of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China |
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| Abstract: |
| The work aims to study the effect of MoO3/BaO composite on the tribological properties of plasma sprayed NiAl matrix composite coating at high temperature according to the oxide ionic potential and cation polarizability criterion, and clarify the high temperature lubrication mechanism of the composite coating. The composite coatings with 20, 30 and 40wt% MoO3/BaO (1∶1) were fabricated by atmospheric plasma spraying technology. The micro-hardness, bonding strength and tribological properties of composite coatings were tested by micro-hardness, universal material testing machine and friction and wear testing machine, respectively. Meanwhile, the micro-structure, phase composition, elemental distribution and morphology of the worn surface of composites coatings were in-depth analyzed by the scanning election microscopy (SEM/EDS), X-ray diffraction (XRD), micro-Raman and transmission electron microscopy (TEM). The NiAl-MoO3/BaO composite coating prepared by MoO3/BaO with lower interaction parameters and large ionic potential difference as composite lubricant effectively improved the tribological properties of NiAl coating at high temperature. Especially, the NiAl-30wt% MoO3/BaO (1∶1) composite coating had a low friction coefficient of 0.15 and a wear rate of 9.31×10–5 mm3/(N.m) at 800 ℃. The composite coating has good anti-friction performance at the temperature above 600 ℃. High temperature promotes the formation of new ternary high temperature lubricating phases BaMoO4 and NiMoO4 on the worn surface, and plays a synergistic lubrication effect on MoO3 and NiO, thus improving the friction and wear resistance of the composite coating at high temperature. At the same time, the formation of a composite oxide lubricating transfer film on the friction dual surface further reduces the wear rate of the coating. |
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