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首页> 美国卫生研究院文献>Materials >In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating
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In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating

机译：原位三元硼化物：对WC-Co复合涂层致密化过程和力学性能的影响

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摘要

New coatings resistant to corrosion in high-temperature molten zinc aluminum were prepared by supersonic flame spraying of various composite powders. These composite powders were prepared by mixing, granulation, and heat treatment of various proportions of Mo–B C powder and WC and Co powder. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF–STEM), energy dispersive X-ray spectroscopy (EDS), and mechanical analysis were used to study the effects of Mo–B C on the microstructure, phase, porosity, bonding strength, and elastic modulus of the composite powder and coating. Results show that the addition of an appropriate quantity of Mo–B C reacts with Co to form ternary borides CoMo B and CoMoB. Ternary boride forms a perfect continuous interface, improving the mechanical properties and corrosion resistance property of the coating. When the amount of Mo–B C added was 35.2%, the mechanical properties of the prepared coating reached optimal values: minimum porosity of 0.31 ± 0.15%, coating bonding strength of 77.81 ± 1.77 MPa, nanoindentation hardness of 20.12 ± 1.85 GPa, Young’s modulus of 281.52 ± 30.22 GPa, and fracture toughness of 6.38 ± 0.45 MPa·m .
机译：通过超声火焰喷涂各种复合粉末，制备了新型的耐高温熔融锌铝腐蚀涂层。这些复合粉末是通过混合，制粒和热处理各种比例的Mo–B C和WC和Co粉末而制备的。 X射线衍射（XRD），透射电子显微镜（TEM），扫描电子显微镜（SEM），高角度环形暗场扫描透射电子显微镜（HAADF–STEM），能量色散X射线光谱（EDS）和力学分析用于研究Mo–BC对复合粉末和涂层的微观结构，相，孔隙率，结合强度和弹性模量的影响。结果表明，适量的Mo–B C与Co反应形成三元硼化物CoMo B和CoMoB。三元硼化物形成完美的连续界面，从而改善了涂层的机械性能和耐腐蚀性。当Mo–BC的添加量为35.2％时，所制备涂层的机械性能达到最佳值：最小孔隙度为0.31±0.15％，涂层结合强度为77.81±1.77 MPa，纳米压痕硬度为20.12±1.85 GPa，杨氏模量值为281.52±30.22GPa，断裂韧性为6.38±0.45MPa·m。

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