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Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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Manufacture of MoO3 Coating Layer Using Thermal Spray Process and Analysis of Microstructure and Properties

  • Yu-Jin Hwang (Inha University, Department of Materials Science and Engineering) ;
  • Kyu-Sik Kim (Inha University, Department of Materials Science and Engineering) ;
  • Jae-Sung Park (Agency for Defense Development) ;
  • Kee-Ahn Lee (Inha University, Department of Materials Science and Engineering)
  • Published : 20220000
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Abstract

MoO3 thick film was manufactured by using a thermal spray process (Atmospheric Plasma Spray, or APS) and its microstructure, phase composition and properties of the coating layer were investigated. Initial powder feedstock was composed of an orthorhombic α-MoO3 phase, and the average powder particle size was 6.7 ㎛. As a result of the APS coating process, a MoO3 coating layer with a thickness of about 90 ㎛ was obtained. Phase transformation occurred during the process, and the coating layer consisted of not only α-MoO3 but also β-MoO3, MoO2. Phase transformation could be due to the rapid cooling that occurred during the process. The properties of the coating layer were evaluated using a nano indentation test. Hardness and reduced modulus were obtained as 0.47 GPa and 1.4 GPa, respectively. Based on the above results, the possibility of manufacturing a MoO3 thick coating layer using thermal spray is presented.

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Acknowledgement

This study was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (No.20011286, The technology innovation program).