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首页> 外文会议>International Thermal Spray Conference Exposition >Influence of the powder morphology and plasma spray process parameters on the structure and properties of AI_2O_3 based plasma sprayed coatings
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Influence of the powder morphology and plasma spray process parameters on the structure and properties of AI_2O_3 based plasma sprayed coatings

机译：粉末形态和等离子体喷涂工艺参数对基于AI_2O_3基于等离子体喷涂涂层的结构和性能的影响

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Plasma sprayed alumina (AI_2O_3) is commonly used as a wear resistant coating material in demanding applications. Improved coating characteristics can be achieved by using agglomerated and sintered (A/S) AI2O3 powders with small additions of e.g. titania (TiO_2) or chromia (Cr_2O_3), instead of blended fused and crushed (F/C) powders. However, the round particle morphology specific to the A/S powder manufacturing process accompanied by lower particle density and higher particle surface area change the injection and melting properties of the particles. It is, therefore, essential to take into account the size distribution and the density of the sprayed powder in the spray process. Changes in the plasma spray and powder injection parameters are necessary to optimise the coating structure, e.g. amount of partially melted particles. Spray diagnostics can be used to assist in this process optimisation. Nowadays robust and simple camera systems are available to measure the spray stream characteristics and particle velocities. In this study, both the F/C and the A/S alumina based powders were sprayed by using a conventional plasma torch with a radial powder injection. The plasma spray process and powder injection parameters were optimised and the injection behaviour of the A/S powders was studied. Changes in the spray stream characteristics caused by the carrier gas flow rate and plasma spray parameters were measured with novel spray diagnostics equipment. The coating structures were studied with SEEM and coating properties, e.g. hardness and wear resistance were evaluated.
机译：等离子体喷涂氧化铝（AI_2O_3）通常用作耐用应用的耐磨涂层材料。通过使用聚集和烧结（A / S）Ai2O3粉末，可以实现改善的涂布特性，所述烧结（A / S）Ai2O3粉末具有少量的少量添加剂。二氧化钛（TiO_2）或Chromia（CR_2O_3），而不是混合熔融和压碎（F / C）粉末。然而，特异于A / S粉末制造过程的圆形颗粒形态伴随着低级粒子密度和更高的颗粒表面积，改变了颗粒的注射和熔融性质。因此，必须考虑喷涂过程中喷涂粉末的尺寸分布和密度是必要的。使等离子体喷雾和粉末注射参数的变化是优化涂层结构的必要条件，例如，部分熔化的颗粒的量。喷涂诊断可用于协助此过程优化。如今，可稳健而简单的相机系统可用于测量喷射流特性和颗粒速度。在该研究中，通过使用具有径向粉末注射的常规等离子体焊炬喷射F / C和A / S氧化铝的粉末。优化了等离子体喷涂工艺和粉末注射参数，研究了A / S粉末的注射行为。用新型喷涂诊断设备测量由载气流速率和等离子体喷射参数引起的喷射流特性的变化。用诸如似乎和涂布性进行的涂层结构，例如涂布性能。评估硬度和耐磨性。

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