用颗粒冲击磨损试验评价热喷涂陶瓷涂层的粒子间结合

Evaluation of the Lamellar Bonding of Ceramic Coating by Particle Erosive Test

热喷涂层中扁平粒子间的结合决定涂层的性能。能评价粒子间结合的简单可靠的方法对于涂层的实际应用具有十分重要的意义。然而采用传统的试验方法如拉伸试验难以获得令人满意的结果。可以预料具有去结合机理的一层接一层去除粒子的试验方法将是有效的。实验证明通过控制测试条件，颗粒冲击磨损试验能够通过去结合机理有效地使涂层产生磨损。本论文提出了陶瓷涂层颗粒冲击磨损的模型，基于涂层受颗粒冲击磨损是因一层层的粒子通过去结合而产生的机理，建立了磨损速度与粒子间结合率的关系。定义为ACT－JP值（磨损速度的倒数）的特征值与粒子间结合率的实验相关性证明了粒子间结合对陶瓷涂层磨损的控制作用和利用颗粒冲击磨损试验评价粒子间结合的可行性。

The lamellar bonding between flattened particles in a thermally sprayed coating determinesgreatly the coating properties. A simple and reliable method to evaluate the lamellar bonding will be ofsignificantly practical interest however, it is much difficult to give a satis factory result by conventionalmethods such as tensile test. It is expected that a method of debonding mechanism of 1ayer by layer beeffective. It has been proved that by controlling test conditions the particle erosive test is effective to causematerial removal by the debonding mechanism.The present report proposes a model for the particle erosion of ceramic coating. Based on the lamellardebonding layer by layer by particle impace, the relationship between erosion rate and the mean bonding ratiois established. Correlation between characteristic value which is referred to as the ACT-JP value (reciprocalof erosive rate ) and the mean bonding ratio for Al2O3 coating proves experimentally domonant effect oflamellar bonding on the erosion of ceramic coating and the feasibility to evaluate the lamellar bonding uingerosive test.