| SHUI Guo-hong,YANG Yi,WU Ming-xia,YANG Gang,WANG Li-bo,HUANG Yuan.Self-reparing Layers Analysis on the Surface of Iron-based Metal Friction Pairs[J],47(8):139-146 |
| Self-reparing Layers Analysis on the Surface of Iron-based Metal Friction Pairs |
| Received:March 21, 2018 Revised:August 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.08.020 |
| KeyWord:magnesium silicate hydroxide friction and wear self-repairing microhardness diamond-like friction coefficient |
| Author | Institution |
| SHUI Guo-hong |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
| YANG Yi |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
| WU Ming-xia |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
| YANG Gang |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
| WANG Li-bo |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
| HUANG Yuan |
School of Manufacturing Science and Engineering, Sichuan University, Chengdu , China |
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| Abstract: |
| The work aims to analyze the effects of different working conditions on superficial self-repairing layers, and study the mechanism of action of magnesium silicate hydroxide nanotube in the process of friction and wear. With artificially synthesized magnesium silicate hydroxide nanotube Mg3Si2O5(OH)4 as a self-repairing additive, friction and wear test was applied to an iron-based metal friction pair under the condition of oil lubrication. Thickness, elemental composition, surface structure and surface microhardness of the self-repairing layer was characterized by SEM, EDS, laser Raman spectrometer and micro Vickers, respectively. The self-repairing layers were detected at the revolving speed of 1000 r/min and 2000 r/min, and the load of 200 N, 300 N and 400 N. The thickest self-repairing layer was obtained at the revolving speed of 2000 r/min and load of 400 N. Negative wear happened to repaired friction pairs during the experiment, and the self-repairing layers were mainly composed of such elements as C, O, Fe. Compared with base oil experiment, friction coefficient at high speed and load decreased by 0.008. The self-repairing layers were diamond-like structures, and average hardness of the self-repairing layers was about 673HV, which was 1.87 times that of substrate. Alloyed repair layers of high hardness diamond-like structure take shape under the combined action of magnesium silicate hydroxide, base oil and ablation as well as the effect of high energy friction, which can effectively protect working face of friction pair and prolong its service life. By increasing experimental load and revolving speed, the formation of self-repairing layer can be accelerated, negative wear of friction pair can be realized and friction coefficient can be reduced. |
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