4.7 Article

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

期刊

CERAMICS INTERNATIONAL
卷 47, 期 3, 页码 3671-3679

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.09.219

关键词

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

资金

  1. Korea Institute of Ceramic Engineering and Technology [119-82-06696]
  2. Industrial Strategic Technology Development Program of the Ministry of Trade, Industry and Energy (MOTIE) [10077479]

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By studying the application of suspensions with different particle sizes on thermal insulation coatings, the microstructure and thermal properties of the coatings can be improved. The density of unmelted particles in the coating has a significant effect on the thermal conductivity of the coatings.
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.

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