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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 combination of flat particles in the thermal spray coating determines the properties of the coating. A simple and reliable method of evaluating the interparticle bonding is of great importance to the practical application of the coating. However, it is difficult to obtain satisfactory results using conventional test methods such as tensile testing. It is expected that a test method of layer-by-layer particle removal with debonding mechanism would be effective. Experiments show that by controlling the test conditions, the particle impact wear test can effectively wear the coating through a debonding mechanism. In this paper, a model of the impact wear of ceramic coating particles is proposed. Based on the mechanism that the coating is affected by particle impact and abrasion caused by the combination of particles in one layer, the relationship between the wear rate and the binding rate between particles is established. Experimental correlations defined as ACT-JP values (reciprocal of wear rate) and interparticle binding rates demonstrate the control effect of interparticle bonding on ceramic coating wear and the feasibility of evaluating particle-to-particle bonding using a particle impact wear test .