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Relationships between Process Parameters, Microstructure and Adhesion Strength of HVOF Sprayed IN718 Coatings

机译：HVOF喷涂IN718涂层的工艺参数，微观结构与附着强度之间的关系

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摘要

Fundamental understanding of relationships between process parameters, particle in-flight characteristics and adhesion strength of HVOF sprayed coatings is important to achieve the high coating adhesion that is needed in aeronautic repair applications. In this study statistical Design of Experiments (DoE) was utilized to identify the most important process parameters that influence adhesion strength of IN718 coatings sprayed on IN718 substrates. Special attention was given to the parameters combustion ratio, total gas mass flow, spray distance and external cooling, since these parameters were assumed to have a significant influence on particle temperature and velocity. Relationships between these parameters and coating microstructure were evaluated to fundamentally understand the relationships between process parameters and adhesion strength.
机译：基本了解HVOF喷涂涂层的工艺参数，飞行中的特性和附着强度之间的关系，对于实现航空维修应用所需的高涂层附着力非常重要。在这项研究中，利用统计实验设计（DoE）来确定影响喷涂在IN718基材上的IN718涂层的附着强度的最重要的工艺参数。特别要注意的是燃烧比，总气体质量流量，喷雾距离和外部冷却等参数，因为这些参数被认为对颗粒温度和速度有重要影响。对这些参数与涂层微结构之间的关系进行了评估，以从根本上理解工艺参数与附着强度之间的关系。

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