紀要論文

紀要論文

text

Transactions of JWRI. 2005, 34(1), p. 25-30

Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation

英語

text

2005-07

Thermal Barrier Coatings (TBCs) are frequently prepared by the thermal plasma spraying method. The performance of the TBC coating is strongly determined by process parameters, such as particle temperature and velocity, plasma temperature and range. In this paper, an optical emission spectroscopy system is used to determine the excitation temperature generated by a gas tunnel type cascade arc plasma gun and a high speed CCD camera is used to image the spatial profile of plasma emission intensity in the form of successive frames at a time resolution of 30μs and to get the plasma range. As both of them are believed to be the key factors for determining the molten surface status and velocity of the sprayed particles, the plasma temperature and range are presented as the tendencies dependent on discharge power and gas flow rate. Based on these tendencies, the radiation power and heat flux from the plasma are evaluated, the plasma velocity at the exit of the generation gun has been solved theoretically. In order to show the effect of powder injection on the plasma plume, when Al₂O₃ powder is injected by the argon carrier, the plasma temperature is calculated from the emission spectra of aluminum atoms melted away from the powder particles and is lower than that obtained from argon spectra.

10.18910/8415

8415

Spectroscopic Characterization of Smart Spraying Plasmas for Thermal Barrier Coatings Preparation

大阪大学接合科学研究所

英語

2005-07

Transactions of JWRI

34

1

25

30

https://hdl.handle.net/11094/8415

10.18910/8415

https://doi.org/10.18910/8415