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5447 |
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Friday, June 09, 2017, Hall 27 3:00 PM Plasma Spraying II |
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Fabrication of boron carbide coating by atmospheric inductively coupled plasma spraying |
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Lin Li* / Chinese Academy of Sciences, P.R. China Peng Zhao/ Institute of Plasma Physics, Chinese Academy of Sciences, China Qijia Guo/ Institute of Plasma Physics, Chinese Academy of Sciences, China Qiujiao Zhou/ Institute of Plasma Physics, Chinese Academy of Sciences, China Junli Cheng/ Institute of Plasma Physics, Chinese Academy of Sciences, China Yuedong Meng/ Institute of Plasma Physics, Chinese Academy of Sciences, China |
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Boron carbide (B4C) is low Z (atomic number) refractory and chemically stable, so was proposed as a protective coating for first wall materials in nuclear fusion device. An Ar/H2 inductively coupled plasma torch driven by a 24-60 MHz RF power was used for spraying B4C coatings on both tungsten and copper substrates. In previous studies, we found that adding H2 to Ar plasma would improve the adhesion of B4C coating. In this work, the influence of flow rate of plasma gas and input power on the quality of coatings deposited on tungsten and copper substrates was discussed. Optical emission spectroscopy (OES) measurement was performed to diagnose plasma rotational temperature and electron temperature. Intensified CCD camera was used to characterize the spraying particle movement in plasma. The morphology of coating was characterized by scanning electron microscopy (SEM). Energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were used to analyze the composition. All the plasma properties and the results of B4C/Cu coating would give us an insight on the mechanism and the possibility of improving the process. |