| BIAN Da,QIAN Shan-hua,HE Ying-shi,LIU Yang,NI Zi-feng.Study on the Tribological Properties of Phosphate Bonded Composite Coatings under Water Lubrication Conditions[J],52(11):216-224, 247 |
| Study on the Tribological Properties of Phosphate Bonded Composite Coatings under Water Lubrication Conditions |
| Received:September 25, 2022 Revised:May 13, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.016 |
| KeyWord:composite coating hydrogel PAAM-alginate hydration-lubricating tribological property |
| Author | Institution |
| BIAN Da |
School of Mechanical Engineering,Jiangsu Wuxi , China |
| QIAN Shan-hua |
School of Mechanical Engineering,Jiangsu Wuxi , China |
| HE Ying-shi |
School of Textile Science and Engineering, Jiang Nan University, Jiangsu Wuxi , China |
| LIU Yang |
School of Mechanical Engineering,Jiangsu Wuxi , China |
| NI Zi-feng |
School of Mechanical Engineering,Jiangsu Wuxi , China |
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| Abstract: |
| Hydrogel is a kind of three-dimensional network polymer formed by chemical or physical cross-linking of hydrophilic polymers. It can also be defined as a three-dimensional cross-linked polymer network that can swell but is insoluble in water. As a typical soft material, hydrogel contains many hydrophilic groups in their 3D networks and is one of the most important synthetic alternatives for natural lubricators. This material has ultra-high hydration lubrication capacity and can produce low friction coefficients, providing the basis for tribological applications in water environments. In order to improve the tribological properties of the composite coatings, the hydration and lubrication ability of hydrogels were applied to composite coatings. In this paper, porous phosphate bonded composite coatings were prepared by adding different contents of PS (polystyrene microspheres), and then PAAM-alginate (polyacrylamide-alginate) hydrogel was vacuum added to the porous coating, and UV light was used in initiated polymerization to prepare PAAM-alginate/phosphate bonded composite coatings. In the experiment, a Vickers hardness tester was used to measure the hardness of the coating. A contact angle measuring instrument was used to measure the contact angle of the coating. A multifunctional friction tester was used to characterize the tribological properties of the coating. A white light interferometer was used to measure the surface roughness of the coating and observe the three-dimensional morphology of wear marks on the coating, to calculate the wear rate of the coating. A scanning electron microscope was used to analyze the wear scar and cross-sectional micro-morphology of the coating. The wear scar and cross section micro-morphology of the coating were analyzed with a SEM (scanning electron microscope) and an EDS (energy dispersive spectroscopy). In addition, the swelling behavior of different composite coatings was evaluated by weighing. The results showed that with the addition of PAAM-alginate hydrogel, the hardness and surface roughness of the composite coating was reduced, and the average roughness was 0.8 μm. And because of its strong water absorption and swelling ability, the hydrophilicity of the composite coating was improved. More importantly, the hydration-lubricating ability of the PAAM-alginate hydrogel effectively enhanced the tribological properties of the composite coating in aqueous environment. Among them, the composite coating with 4 wt-% PS showed the best tribological properties, the friction coefficient decreased from 0.494 to 0.332, and the wear rate was 1.18 mm3/N.m, which was only a quarter of the wear rate of the composite coating with 0 wt-% PS, and one third of the wear rate of the composite coating with 6 wt-% PS. And the wear forms of the four composite coatings with different PS contents were fatigue wear in aqueous environment. The analysis results show that, an appropriate amount of PAAM-alginate hydrogel can reduce the surface roughness of the composite coating, improve the hydrophilicity of the composite coating, and improve the tribological properties of the composite coating in water environment. Based on the experimental results, the wear mechanism of PAAM alginate/phosphate bonded composite coatings is analyzed in this paper, which provides an new idea for the application and design of PAAM alginate hydrogel in water lubrication materials. |
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