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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >An integrated study of thermal spray process-structure-property correlations: A case study for plasma sprayed molybdenum coatings
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An integrated study of thermal spray process-structure-property correlations: A case study for plasma sprayed molybdenum coatings

机译：热喷涂工艺-结构-性能相关性的综合研究：以等离子喷涂钼涂层为例

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摘要

Thermal spray coatings exhibit a wide variety of hierarchial and multiscale microstructural characteristics that lead to variation in their functional properties and performance. The array of defect structures, orthotropic behaviour and process-induced attributes (e.g. quenching stresses) all add to complexity in understanding and predicting their performance. A complete understanding of the plasma spray process includes examination of the particle-jet interaction, particle impact (to form the splats) and the particle-substrate interaction during coating deposition. This link has been established by using diagnostic tools in conjunction with a splat collection shutter and an 'in situ' curvature measurement instrument. In this study, commercial grade spherical molybdenum (Mo) powder was plasma sprayed and the spray stream was characterized for resulting particle state. A 'splat map' was deposited through a 'spray stream guillotine' to capture the fingerprint of the plume cross-section. Subsequently, coatings were deposited at these spray conditions on a newly developed 'in situ' curvature measurement instrument to measure coating residual stresses and to estimate the coating modulus. Splats and coatings were subsequently characterized by microdiffraction (for splat residual stresses), nano and microindentation for elastic and elastic-plastic properties and by electron microscopy. This complete history of the process followed by splat and coating characterization provides insight into the correlation between processing parameters, resultant particle states and final coating properties. The role of particle temperature and velocity on the splat (and coating) morphology and residual stress is explained in the results.
机译：热喷涂涂层表现出各种层次和多尺度的微观结构特征，导致其功能特性和性能发生变化。缺陷结构，正交各向异性行为和过程引起的属性（例如淬火应力）的阵列都增加了理解和预测其性能的复杂性。对等离子喷涂过程的完整理解包括检查涂层沉积过程中的颗粒喷射相互作用，颗粒撞击（形成碎片）以及颗粒与基材的相互作用。通过使用诊断工具以及splat收集百叶窗和“原位”曲率测量仪器，可以建立此链接。在这项研究中，对商业级球形钼（Mo）粉末进行了等离子喷涂，并针对所产生的颗粒状态对喷雾流进行了表征。通过“喷射流断头台”放置“喷溅图”以捕获羽状横截面的指纹。随后，在这些喷涂条件下，将涂层沉积在新开发的“原位”曲率测量仪器上，以测量涂层残余应力并评估涂层模量。随后，通过微衍射（针对splat残余应力），纳米和微压痕的弹性和弹塑性特性以及电子显微镜对Splats和涂层进行表征。该过程的完整历史记录以及随后的splat和涂层表征，使您可以深入了解加工参数，所得颗粒状态和最终涂层性能之间的相关性。结果解释了粒子温度和速度对splat（和涂层）形态和残余应力的作用。

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