| WEI Wentao,WANG Quanlong,WANG Jianyu,WANG Yiyao,LI Xiao.Effect of SiO2-BNNSs Hybrid Material on High Temperature Tribological Properties of Phosphate Composite Coatings[J],53(15):34-44, 76 |
| Effect of SiO2-BNNSs Hybrid Material on High Temperature Tribological Properties of Phosphate Composite Coatings |
| Received:July 26, 2023 Revised:October 27, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.003 |
| KeyWord:boron nitride nanosheets silica hybrid material phosphate composite coating high temperature wear resistance |
| Author | Institution |
| WEI Wentao |
School of Mechanical Engineering,Jiangnan University, Jiangsu Wuxi , China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology,Jiangnan University, Jiangsu Wuxi , China |
| WANG Quanlong |
School of Mechanical Engineering,Jiangnan University, Jiangsu Wuxi , China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology,Jiangnan University, Jiangsu Wuxi , China |
| WANG Jianyu |
School of Mechanical Engineering,Jiangnan University, Jiangsu Wuxi , China;Jiangsu Micronano Manufacturing Engineering Research Center, Jiangnan University, Jiangsu Wuxi , China |
| WANG Yiyao |
School of Mechanical Engineering,Jiangnan University, Jiangsu Wuxi , China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology,Jiangnan University, Jiangsu Wuxi , China |
| LI Xiao |
School of Mechanical Engineering,Jiangnan University, Jiangsu Wuxi , China |
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| Abstract: |
| Phosphate composite coatings have excellent properties such as high hardness, wear resistance, corrosion resistance, and high temperature resistance, and the material is environmentally friendly and pollution-free. It is an advanced stainless steel metal surface protection technology. However, with the increasingly harsh service conditions of stainless steel metal components, traditional phosphate coatings have problems such as high porosity and poor wear resistance under high temperature conditions, which limit their application in fields such as marine engineering, petroleum industry, and chemical engineering. Therefore, by adding silica hybrid boron nitride nanosheets (SiO2-BNNSs) into the phosphate composite coating, the high-temperature hardness and high-temperature wear resistance of the phosphate composite coating can be improved. With tetraethyl orthosilicate (TEOS) as the silicon source, SiO2-BNNSs hybrid material was prepared by the sol-gel method, and used as a nano reinforcement phase of the coating. A stainless steel 304 steel plate was cut into square blocks (20 mm×20 mm×2 mm) as the substrates, which were then subject to sandblasting to Sa 2.5, and then ultrasonic cleaning with anhydrous ethanol for 1 hour to remove surface oil and dust. Alumina (Al2O3), zirconia (ZrO2), aluminum vanadium (Bauxite), BNNSs and SiO2-BNNSs reinforcement were mixed in proportion, and then subject to ball milling treatment. The ball milled powder was mixed with aluminum dihydrogen phosphate (AP) binder evenly to produce a coating slurry. According to the spraying method, the coating slurry with different mass fractions after stirring was sprayed onto the surface of the 304 substrates, and then the coating samples were obtained through room temperature and heating curing, respectively. The chemical composition and micro morphology of SiO2-BNNSs hybrid material were analyzed by X-ray photoelectron spectroscopy (XPS), field emission Scanning electron microscope (FE-SEM) and transmission electron microscopy (TEM). In addition, the microhardness of the coating after high-temperature heating was tested with a microhardness tester, and the friction and wear behavior of phosphate composite coatings with different contents of BNNSs and SiO2-BNNSs were studied through high-temperature friction and wear tests. The wear morphology of the coatings were characterized to discuss the wear mechanism of the coatings under high-temperature conditions. SiO2-BNNSs hybrid reinforcement material was successfully prepared by the sol-gel method. XPS, SEM and TEM analysis results showed that SiO2 was successfully modified on the surface of BNNSs. Using spraying method, phosphate composite coatings with different contents of BNNSs and SiO2-BNNSs were successfully prepared, the SiO2-BNNSs phosphate coatings were more uniform and denser than the zero content BNNSs coating and the pure BNNSs coating. The hardness of the SiO2-BNNSs coating with a mass fraction of 0.4wt.% at 400 ℃ was up to 261.2HV. High temperature friction tests showed that the addition of BNNSs and SiO2-BNNSs could reduce the wear phenomenon of the coatings. The higher the temperature, the better the wear resistance of the coating, and the friction coefficient and wear rate of the 0.4wt.% SiO2-BNNSs coating at 400 ℃ were 0.48 and 66.24×10–6 mm3/(N.m) respectively, indicating the best high-temperature wear resistance performance. These results conclude that the addition of SiO2-BNNSs hybrid material can significantly improve the high-temperature wear resistance of phosphate composite coatings. Flaky BNNSs will form a lubricating film during the coating wear process; At the same time, the hybridization of SiO2 on BNNSs results in a more uniform dispersion of nanomaterials in the coating, resulting in a denser coating and higher load-bearing capacity; In addition, the high temperature causes more adhesive phase AlPO4 to be generated, which allows more coating aggregates to bond together, effectively compensating for coating defects. |
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