Abstract Metallization of ceramics is drawing more and more attention in industries. The mechanisms involving high bonding strength between cold sprayed metallic coatings and ceramic substrates are not yet clear. In this study, aluminum (Al) particles and alumina (Al2O3) substrates were employed to reveal impact phenomena in cold spraying. Electron backscatter diffraction equipment (EBSD) and high-resolution transmission electron microscope (HRTEM) were used to investigate the interfacial microstructures of the Al particles and Al2O3 substrates. Computational fluid dynamics (CFD) and finite element analysis (FEA) were employed to quantitatively characterize the temperatures and plastic strains at the interfaces. The bonding strength of the Al coatings and Al2O3 substrates was measured and the analysis to the fracture morphologies was also conducted. The results show that the Al particles at the interfaces presented fine-grain and amorphous structures, and the Al2O3 substrates experienced a brittle rupture. The Al coatings bonded on the ceramic surfaces due to mechanical interlocking and heteroepitaxy. The results offer more details to understand the bonding mechanisms of metallic particles and ceramic substrates.

中文翻译：

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通过冷喷涂实现陶瓷金属化的界面金属/陶瓷结合机制

摘要 陶瓷金属化越来越受到工业界的重视。涉及冷喷涂金属涂层和陶瓷基材之间高结合强度的机制尚不清楚。在这项研究中，铝 (Al) 颗粒和氧化铝 (Al2O3) 基材被用来揭示冷喷涂中的冲击现象。使用电子背散射衍射设备 (EBSD) 和高分辨率透射电子显微镜 (HRTEM) 研究 Al 颗粒和 Al2O3 基材的界面微观结构。计算流体动力学 (CFD) 和有限元分析 (FEA) 用于定量表征界面处的温度和塑性应变。测量了Al涂层和Al2O3基体的结合强度，并对断裂形貌进行了分析。结果表明，界面处的Al颗粒呈现细晶和非晶结构，Al2O3基体发生脆性破裂。由于机械互锁和异质外延，铝涂层结合在陶瓷表面上。结果提供了更多细节，以了解金属颗粒和陶瓷基板的结合机制。