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阻碍热喷涂技术广泛应用的最大障碍之一就是在喷涂过程中缺乏在线控制方法。热喷涂涂层的优化方法是通过对喷涂参数和喷涂参数-涂层性能相关性的经验性调整。而对于一些固有参数是无法调整的,如双丝电弧喷涂过程中的焰流波动和雾化喷嘴磨损,尽管这些参数对涂层的质量有巨大影响,但出于简化目的通常系统地忽略不计。本文中采用声发射分析法,基于所获得的声信号对不可调节参数的影响进行分析。将声发射感应器同时安装在基体和喷嘴上,使得对喷涂过程中的声信号变化进行简单测定成为可能。当增加电流时,一个降低的声信号被记录下来,从而可对不可控参数、声信号和涂层质量之间的相关性进行分析研究。这项研究将有助于探索喷涂过程中的在线控制方法。
One of the biggest hurdles hindering the widespread use of thermal spray technology is the lack of on-line control of the spray process. The optimization of thermal spray coatings is based on empirical adjustments of the spray parameters and spray parameters - coating properties. Unrelated to some intrinsic parameters, such as flame flow fluctuations and atomizing nozzle wear during twin wire arc spraying, these parameters are often systematically ignored for simplicity, although they have a huge impact on the quality of the coating. In this paper, acoustic emission analysis method is used to analyze the influence of non-adjustable parameters based on the obtained acoustic signals. The acoustic emission sensor mounted on the substrate and the nozzle at the same time, making the acoustic signal during spraying a simple determination of possible changes. When the current is increased, a reduced acoustic signal is recorded, allowing the analysis of the correlation between uncontrollable parameters, acoustic signals, and coating quality. This research will help to explore the online control of spraying process.