Crystallization kinetics of the newly developed Al₂O₃‐Y₃Al₅O₁₂ (YAG) amorphous ceramic coating fabricated by atmospheric plasma spraying (APS) were investigated via differential scanning calorimetry (DSC) under non‐isothermal conditions. The phase compositions and microstructure of the as‐sprayed coating were characterized by X‐ray diffraction (XRD) and Scanning electron microscopy (SEM). The glass transition temperature T_g, the onset temperature of crystallization T_c and the peak temperature of crystallization T_p presented heating rate dependence. The related kinetic parameters of activation energies (E_g, E_c, E_p) and Avrami exponents (n) were quantified using various methods including Kissinger, Augis–Bennett, Ozawa and Matusita–Sakka, etc., to understand the phase transition mechanism and crystallization process in depth. A series of parameters including devitrification interval ΔT, thermal stability (T_c, E_c), nucleation resistance E_c/RT_g and fragility index F were quantified in order to evaluate the nucleation mechanism, crystallization behavior and thermal stability of Al₂O₃‐YAG amorphous ceramic coating. Excellent thermal stability was witnessed in the studied coating. Furthermore, the YAG crystalline phases can be reasonably controlled and independently precipitated from the amorphous matrix via proper annealing.

中文翻译：

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等离子喷涂沉积的Al2O3-YAG非晶陶瓷涂层的非等温结晶动力学

通过非等温条件下的差示扫描量热法（DSC）研究了通过大气等离子喷涂（APS）制备的新开发的Al ₂ O ₃ -Y ₃ Al ₅ O ₁₂（YAG）非晶陶瓷涂层的结晶动力学。通过X射线衍射（XRD）和扫描电子显微镜（SEM）表征喷镀后的涂层的相组成和微观结构。玻璃化转变温度T _g，结晶的开始温度T _c和结晶的峰值温度T _p。呈现出加热速率依赖性。活化能（E _g，E _c，E _p）和Avrami指数（n）的相关动力学参数使用多种方法进行定量，包括基辛格，奥格斯-本尼特，小泽和马修斯塔-萨卡等，以了解相变机理。和结晶过程的深入。失透间隔ΔT，热稳定性（T _c，E _c），成核阻力E _c / RT _g和脆性指数F等一系列参数为了评估Al ₂ O ₃ -YAG无定形陶瓷涂层的成核机理，结晶行为和热稳定性，对它们进行了量化。在所研究的涂层中观察到优异的热稳定性。此外，可以通过适当的退火来合理地控制YAG结晶相并从非晶态基质中独立地沉淀出它们。