Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

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  • Suzuki Masato
    Energy Technology Institute, National Institute of Advanced Industrial Science and Technology, AIST
  • Sodeoka Satoshi
    Energy Technology Institute, National Institute of Advanced Industrial Science and Technology, AIST
  • Inoue Takahiro
    Energy Technology Institute, National Institute of Advanced Industrial Science and Technology, AIST

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Zircon is widely used in industrial field as a refractory material, because of its excellent mechanical and chemical properties at high temperature. Authors have been studied on the effect of the heat treatment on the structure and properties of plasma sprayed zircon coating as a candidate for an environmental barrier coating (EBC). In this study, very dense coating with excellent adhesive strength was successfully obtained by optimizing the spray process. Substrate temperature is one of the dominant factors to control porosity and crack formation in the coating. The higher substrate temperature, obtained by plasma pre-heating, resulted in lower porosity and less cracks. Open porosity of the coating was quite low, about 2%, in the coatings obtained especially above 1473 K of the substrate temperature.

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