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热喷涂技术:2024,16(3):84-99
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Al含量对等离子喷涂仿鲍鱼壳结构Al-Al2O3复合涂层组织结构及性能的影响
王倩倩1,李思宁2,曹红波2,许康威1,3,田佳佳1
(1.郑州大学;2.中国舰船研究设计中心;3.洛阳船舶材料研究所)
Effect of Al Content on the Microstructure and Performances of Plasma-Sprayed Al-Al2O3 Composite Coatings with Structure Mimicked by Abalone Shell
WANG Qianqian1, LI Sining2, CAO Hongbo2, XU Kangwei1,3, TIAN Jiajia1
(1.Zhengzhou University;2.China Ship Development and Design Center;3.Luoyang Ship Materials Research Institute)
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投稿时间:2024-09-19    修订日期:2024-10-08
中文摘要: 等离子喷涂陶瓷涂层具有本征脆性且涂层界面结合强度较弱,显著影响其韧性、力学性能、耐腐蚀性能等。采用大气等离子喷涂制备了不同Al含量的仿鲍鱼壳结构Al-Al2O3复合涂层,并系统探究了Al含量对涂层组织结构、力学性能、耐磨性能以及耐腐蚀性能的影响。结果表明,金属Al可有效起到对Al2O3涂层致密化及界面结合提升的作用,30%Al含量的Al-Al2O3复合涂层的孔隙率可由Al2O3涂层的3.39%显著降低至0.15%,结合强度由20.2 MPa提升至41.3 MPa。力学性能测试结果表明,随着Al含量由5%升高至30%,Al-Al2O3复合涂层的硬度逐渐降低、断裂韧性随之增强,耐磨性能呈现先提升后降低的趋势。A1含量为5%时的A1-A12O3复合涂层具有最低的磨损率(3.45×10-4 mm3/(N·m))、最优的耐磨性能,这主要是由于其兼具优异的界面结合和高硬度,涂层的磨损机制主要为氧化磨损、黏着磨损和磨粒磨损。Al-Al2O3复合涂层的耐腐蚀性能随Al含量的增加呈现出先增强后降低的趋势,A1含量为10%时的A1-A12O3复合涂层具有最大的腐蚀电压(—0.48 V)及最低的腐蚀电流密度(5.6 μA/cm2),即表现出最佳的耐腐蚀性能。这主要是由于A1含量为10%时的A1-A12O3复合涂层高的致密度可有效阻挡腐蚀介质的渗入,且同时涂层低的Al含量使得Al2O3自身优异的化学稳定性得以保留,从而使其表现出最佳的耐腐蚀性能。
Abstract:The intrinsic brittleness and poor interface bonding of plasma-sprayed ceramic coatings significantly diminish their toughness, mechanical properties and corrosion resistance. In this study, Al-Al2O3 composite coatings with structure mimicked by abalone shell and different Al contents were prepared by atmospheric plasma spraying. The effects of Al content on the microstructure, mechanical properties, wear resistance, and corrosion resistance of the Al-Al2O3 composite coatings were investigated. The results show that, the addition of Al effectively improves the interface bonding of Al2O3 coating. The porosity of the Al-Al2O3 composite coating with 30% Al is significantly reduced from 3.39% of Al2O3 coating to 0.15%, while the bonding strength increases from 20.2 MPa to 41.3 MPa. Furthermore, as the Al content increases from 5% to 30%, the hardness of the Al-Al2O3 composite coatings gradually decreasesd and the fracture toughness increases, and the wear resistance of the Al-Al2O3 composite coatings improves firstly and then decreases as the increasing of Al content. Specifically, the Al-Al2O3 composite coating with 5% Al exhibits the lowest wear rate of 3.4510-4 mm3/(N·m), revealing its best wear resistance, which is primarily owing to its excellent interface bonding and high hardness. The wear mechanism of Al-Al2O3 composite coating with 5% A1 is proved to be mainly oxidation wear, adhesive wear, and abrasive wear. Likewise, the corrosion resistance of the Al-Al2O3 composite coatings presents an increased trend initially and then decreased gradually with the increase of Al content. The A-10%Al coating demonstrates the highest corrosion potential (—0.48 V) and the lowest corrosion current density (5.60 μA/cm2), suggesting its superior corrosion resistance. This could be attributed to two reasons. Firstly, the notably dense microstructure and strong interface bonding of Al-Al2O3 composite coating with 10% Al coating effectively prevent the infiltration of corrosive media. Additionally, the low Al content and excellent chemical stability of Al2O3 also contribute to its remarkable corrosion resistance.
文章编号:     中图分类号:TG174.4    文献标志码:
基金项目:国家自然科学基金资助项目(52371078);装发慧眼行动项目(62602010332);国防科工局项目(JPPT-2023-119,JPPT-2022-119)
引用文本:
王倩倩,李思宁,曹红波,许康威,田佳佳.Al含量对等离子喷涂仿鲍鱼壳结构Al-Al2O3复合涂层组织结构及性能的影响[J].热喷涂技术,2024,16(3):84-99.
Wang Qianqian,Li Sining,Cao Hongbo,Xu Kangwei,Tian Jiajia.Effect of Al Content on the Microstructure and Performances of Plasma-Sprayed Al-Al2O3 Composite Coatings with Structure Mimicked by Abalone Shell[J].Thermal Spray Technology,202416(3):84-99.

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