Articles
  • Microstructure control and change in thermal conductivity of 8YSZ/SiO2 multi-compositional coating by suspension plasma spraying
  • Hak-Beom Jeona,b, In-Hwan Leeb , Gye Seok Ana and Yoon-Suk Oha,*
  • a Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology, 3321 Gyeongchung-daero, Sindun-myeon, Icheon 467-843, Korea b Department of Materials Science and Engineering Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, Korea
Abstract
In recent years, thermal insulation coating technology for automotive engine parts has received significant attention as a means of improving the thermal efficiency of automotive engines. One of the characteristics of thermal insulation coatings is their low thermal conductivity, and, materials such as YSZ (Yttria-stabilized zirconia), which have low thermal conductivity, are used for this purpose. This research presents a study of the changes in the microstructure and thermal conductivity of 8YSZ/SiO2 multi compositional thermal insulation coating for different compositions, and particle size distributions of suspension, when it is subjected to suspension plasma spraying. To obtain a porous coating structure, the mixing ratio of 8YSZ and SiO2 particles and the particle sizes of the SiO2 were changed. The microstructure, phase formation behavior, porosity and thermal conductivity of the coatings were analyzed. The porosities were found to be 1.2-32.1%, and the thermal conductivities of the coatings were 0.797-0.369 W/mK. The results of the study showed that the microstructures of the coatings were strongly influenced by the particle size distributions, and that the thermal conductivities of the coatings were greatly impacted by the microstructures of the coatings.

Keywords: Thermal insulation coating, Suspension plasma spraying, Microstructure, Thermal conductivity, Porosity

This Article

  • 2018; 19(6): 450-454

    Published on Dec 31, 2018

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