| ZHOU Qi,LU Li-can,YI Ge-wen,WANG Wen-zhen,JIA Jun-hong.Tribological Behavior of Plasma Sprayed Cr3C2/NiCr Cermet Based High Temperature Lubrication Coatings[J],48(8):212-217 |
| Tribological Behavior of Plasma Sprayed Cr3C2/NiCr Cermet Based High Temperature Lubrication Coatings |
| Received:March 22, 2019 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.028 |
| KeyWord:atmospheric plasma spraying Cr3C2/NiCr cermet coating tribo-chemical reaction lubrication coatings high temperature coatings tribological behavior |
| Author | Institution |
| ZHOU Qi |
1.Schoolof Chemistry, Xiangtan University, Xiangtan , China; 2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LU Li-can |
1.Schoolof Chemistry, Xiangtan University, Xiangtan , China |
| YI Ge-wen |
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| WANG Wen-zhen |
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| JIA Jun-hong |
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| The work aims to investigate and study the friction behavior and wear mechanisms of Cr3C2/NiCr-Ag-MoO3-CaF2 and Cr3C2/NiCr-CaF2 cermet coatings sliding against ZrO2 ceramic ball at room temperature of 800 ℃. Cr3C2/NiCr cermet coatings containing CaF2, Ag and MoO3 were prepared on the surface of Inconel 718 steel by atmospheric plasma spraying technology with Cr3C2/NiCr as substrate materials and CaF2, Ag and MoO3 as solid lubricants. Friction and wear behavior of cermet coatings were studied by UMT-3 high temperature friction and wear tester at room temperature to 800 ℃. The micro-hardness and bond strength of the coating were tested by micro-hardness tester and universal material testing machine. The microstructure, phase composition and microscopic morphology of the wear track of the cermet coating were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. The Cr3C2/NiCr-CaF2 and Cr3C2/NiCr-Ag-MoO3-CaF2 cermet coatings had dense microstructure, the micro-hardness and bonding strength of cermet coatings decreased with the increase of solid lubricant content and the bonding strength and micro-hardness of cermet coating was 46.45 MPa and 524.61HV0.3, 36.65 MPa and 478.29HV0.3, respectively. The friction coefficient and wear rate of the cermet coatings decreased with the increase of temperature and reached the lowest at 800 ℃, 0.30 and 0.19, 3.84×10-5 mm3/(N•m) and 2.89×10-5 mm3/(N•m), respectively. CaF2 can obviously improve the tribological performances of Cr3C2/NiCr cermet coating above 600 ℃. The improved the triboloical properties of Cr3C2/NiCr cermet coatings above 600 ℃ are mainly attributed to the synergistic lubricating effect of molybdates formed on the worn track by tribo-chemical reaction of Ag, CaF2 and MoO3. |
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