Changes in thermal conductivity and thermal shock resistance of YSZ-SiO2 suspension plasma spray coatings according to various raw material particle sizes

Hakbeom Jeon, Inhwan Lee, Yoonsuk Oh

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, a technique for improving the thermal efficiency of automotive engines has received considerable attention, namely the application of thermal insulation coatings to automotive engine components to reduce heat loss. This study presents thermal shock resistance and related microstructural changes and thermal properties of 8 wt% yttria-stabilized zirconia (8YSZ)/SiO2 multi-compositional thermal insulation coatings with suspensions of various particle sizes, when subjected to suspension plasma spray. After 10,000 cycles of thermal shock testing of the coatings, it was found that different degradation behavior related to the different microstructure of the coatings was influenced by the particle sizes of the suspension. The thermal conductivity of the coatings was significantly reduced by increasing the distribution of the unmelted particles within the coating.

Original languageEnglish
Pages (from-to)3671-3679
Number of pages9
JournalCeramics International
Volume47
Issue number3
DOIs
Publication statusPublished - 2021 Feb 1

Keywords

  • Automotive engine
  • Suspension plasma spray
  • Thermal insulation coating
  • Thermal shock resistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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