| HUI Yang,LIU Gui-min,YAN Tao,LIU Ming,DU Lin-fei.Effect of Sliding Frequency on Tribological Property of Mo Coating Deposited by Supersonic Plasma Spraying Technique[J],48(10):196-205 |
| Effect of Sliding Frequency on Tribological Property of Mo Coating Deposited by Supersonic Plasma Spraying Technique |
| Received:January 07, 2019 Revised:October 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.024 |
| KeyWord:supersonic plasma spraying Mo coating current-carrying friction and wear sliding frequency friction coefficient wear rate |
| Author | Institution |
| HUI Yang |
Academy of Army Armored Forces, Beijing , China |
| LIU Gui-min |
Academy of Army Armored Forces, Beijing , China |
| YAN Tao |
Academy of Army Armored Forces, Beijing , China |
| LIU Ming |
Academy of Army Armored Forces, Beijing , China |
| DU Lin-fei |
Academy of Army Armored Forces, Beijing , China |
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| Abstract: |
| The work aims to improve the high-frequency current-carrying friction and wear properties of 45NiCrMoVA steel. The Mo coating was prepared on the surface by supersonic plasma spraying. The temperature distribution, arc rate and arc morphology were recorded by infrared thermal imager and high-speed camera in the experiment of current-carrying friction. The friction coefficient, stability coefficient, wears profile and wear rate of the coating were measured by a current-carrying friction and wear tester and a three-dimensional topography instrument. The wear marks and debris were analyzed by Field-Emission Scanning Electron Microscope, Energy Dispersive Spectrometer, and X-Ray Diffraction. When the sliding frequency increased from 5 Hz to 20 Hz, the arc initiation rate increased from 1.13% to 8.24%, resulting in a gradual expansion of the arc ablation area. The change of surface temperature in the process of current-carrying friction was obviously influenced by sliding frequency and experimental time. The maximum temperature of each group reached at 300 s, ranging from 63.3 ℃ to 91.7 ℃. The friction coefficient and stability coefficient of the coating decreased first and then increased with the increase of sliding frequency. At 15 Hz, the values of friction coefficient and stability coefficient reached the minimum, which was 0.337 (average friction coefficient) and 1.443 respectively; The wear rate also decreased first and then increased with the growth of sliding frequency, and reached the minimum value at 10 Hz, which was 66.6×104 μm3/ (N•m). When the frequency was greater than 15 Hz, the depth and width of wear mark increased greatly. The friction film can reduce the adhesion tendency between friction pairs and improve the motion stability. The formation and fracture of friction film are affected by many factors such as surface temperature, material yield strength and so on, which are the main reasons for the change of friction coefficient. In addition to mechanical losses, current-carrying friction also has electrical losses and electrical-mechanical losses. At high frequency, the phenomenon of arc ablation is obvious and at the same time, it aggravates adhesion wear, oxidation wear, lamellar exfoliation and abrasive wear, which leads to higher wear rate. |
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