反应等离子喷涂 Al2O3-TiB2-Al 复相涂层的反应机理

目的在铝合金表面制备Al2O3-TiB2-Al复合涂层,研究Al,TiO2,B2O3在等离子喷涂中的反应机理。方法采用反应等离子喷涂技术在铝合金表面制备复合涂层,应用扫描电镜与X射线衍射技术测试复合涂层的物相组成和显微组织,并通过燃烧波淬熄试验分析等离子喷涂产物。结果机械球磨可以有效降低粉末发生反应的活化能,等离子喷涂最佳飞行距离范围为150~200 mm。结论喷涂粉末在飞行过程中发生反应,经历了预热、熔化、分解、团聚等过程,验证了最终引燃发生燃烧化学反应的机理。

Reaction Mechanism of the Formation of Plasma-spraying Al2 O3-TiB2 -Al Composite Coatings

Objective To investigate the preparation of Al₂O₃ -TiB₂ -Al composite coating on the aluminum alloy surface, and analyze the reaction mechanism of Al, TiO₂, B₂O₃in plasma spraying. Methods The composite coating was prepared on the surface of aluminum alloy using plasma spraying technology. The phase composition and microstructure evaluation of composite coating layer were analyzed by scanning electron microscopy ( SEM) and X-ray diffraction technology. The combustion products of combustion front quenching technique were tested. Results It was found that the activation energy of the powder reaction was effectively decreased by mechanical milling, and the optimal flying distance range of plasma spraying was 150 ~ 200 mm. Conclusion According to the results, the composite powder experienced the processes of preheating, melting, decomposition and agglomeration during the flight, which verified the mechanism of combustion reaction.