| CHAI Hui,WANG Xin-hua,SUN Tao,CHENG Yi-qi,YANG Lin,QI Yong-sheng.Preparation and Performance Study of Ti-CNF Reinforced Epoxy Resin Composite Coating[J],51(5):166-176 |
| Preparation and Performance Study of Ti-CNF Reinforced Epoxy Resin Composite Coating |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.05.018 |
| KeyWord:epoxy resin composite coating hardness and adhesion fracture toughness tribological performance seawater corrosion resistance |
| Author | Institution |
| CHAI Hui |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
| WANG Xin-hua |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
| SUN Tao |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
| CHENG Yi-qi |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
| YANG Lin |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
| QI Yong-sheng |
Institute of Intelligent Machinery, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing , China |
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| Abstract: |
| To improve the wear resistance and corrosion resistance of the friction pair of seawater axial piston pump, Ti-CNF reinforced epoxy resin composite coating is designed and prepared with titanium nanoparticles (Ti) and carbon nanofibers (CNF) as raw materials.To improve the resistance of wear and corrosion for the frictional pairs of seawater hydraulic pumps, a combination of inorganic nanoparticles and metal nanoparticles is proposed. Ti-CNF reinforced epoxy resin composite coatings with different filler contents are prepared by mixing the two nanomaterials in equal amounts based on the obstructing effect of carbon nanofibers (CNF) of different lengths on the diffusion path of seawater, as well as the phenonmen that the protective effect of titanium nanoparticles (Ti) can form a dense oxide film by rapid passivation with oxygen at room temperature, and the volume expansion of titanium nanoparticles during their own oxidation can achieve the filling effect of microcracks in the composite coating. The evolution of functional groups in pure resin and Ti-CNF reinforced epoxy resin composites are analyzed with employing the infrared spectroscopy. The hardness, adhesion, fracture toughness, tribological characteristics and corrosion resistance of some kinds of epoxy resin composite coatings reinforced with variant Ti-CNF contents are evaluated by experiments. The fracture, wear and corrosion mechanisms of composite coatings are revealed using scanning electron microscopy. The bonding of Ti-CNF hybrid filler with the resin matrix is a process of physical reaction. Pure resin composites have great brittleness. And the hardness, adhesion, fracture toughness, friction coefficient and wear rate at this point can respectively reach 374HL, 3.5 MPa, 0.738 MPa.m1/2, 0.487 and 12.23×10−13 m3/(N.m). After immersion test with acid and alkali resistant solution, the composite coating appears obvious peeling and cracking. With the increase of Ti-CNF nanohybrid filler content, the hardness, adhesion, fracture toughness, friction wear and acid and alkali solution impregnation resistance of the composites showed a trend of increasing and then decreasing. The hardness, adhesion, fracture toughness and friction wear properties of the composites are substantially improved when the filler additionsare 2wt.% and 4wt.% compared to the pure resin. However, obvious bubbles and pitting are still observed on the surface of the composite coating after the acid and alkali resistant solution impregnation test. The bonding mode between Ti-CNF mixed filler and resin matrix is physical bonding. The optimum effects of reinforcement for composite can be obtained when the additive filler is 6wt.%. And the hardness, adhesion, fracture toughness, friction coefficient and wear rate at this point can respectively reach 668HL, 5.8 MPa, 0.937 MPa.m1/2, 0.354 and 7.52×10−13 m3/(N.m). No obvious rust spots are observed after immersion test in acid and alkali resistant solutionAlso, the rust spots are unconspicuously observed after seawater dipping corrosion test. However, the performance of the composite coating gradually decreases with the additive filler increased to 8wt.%. And the hardness, adhesion, fracture toughness, friction coefficient and wear rate at this point can respectively reach 643HL, 4.4 MPa, 0.84 MPa.m1/2, 0.427 and 8.86×10−13 m3/(N.m). Also, the rust spots are obviously observed by the seawater dipping corrosion test. The obtained results show that the suitable content of Ti-CNF hybrid filler can effectively enhance the hardness, fracture toughness, tribological performance and corrosion resistance of the composite epoxy resin. The chemical reaction of Ti nanoparticles with oxygen can effectively inhibit the continued growth of micro-cracks. The surrounding resin matrix motion and extends diffusion path of the acid-base solution within the resin is restrained due to the variation of the CNF filler in dimension. Thus, the performance of the composite coating can be improved greatly after the combination of the two fillers. |
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