Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 34, Issue 5, Pages 1187-1192Publisher
WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-019-2176-x
Keywords
Al-12Si piston alloy; cathode plasma electrolytic deposition (CPED); ZrO2 nano-particles; heat-shielding performance; thermal shock performance
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Funding
- Youth Innovation Team of Shaanxi Universities
- Shaanxi Key Research and Development Program [2018GY-111]
- Shaanxi Provincial Department of Education Industrialization Cultivation Project [17JF009]
- Yulin Science and Technology Project [2016-16-4, 2018-2-30]
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A novel thermal-protective coating has been successfully prepared by CPED process on a cast Al-12%Si alloy with the addition of ZrO2 nano-particles in the electrolyte. The microstructures and phase composition of the coatings were analyzed by SEM and XRD, and the heat insulation performance and the thermal shock resistance of the coatings were investigated. With ZrO2 nanoparticles addition, the cathode plasma discharge on the coating surface is more obvious than that without ZrO2 nanoparticles addition, the coating is more uniform and compact, and the thickness of the coating increases. Furthermore, the content of Zr and Y elements increases and the degree of crystallization of the coating is more complete. The formation of the solid solution of yttrium stabilized zirconia is promoted by cathode plasma discharge. In addition, the thermal insulation temperature increases as ZrO2 nano-particles are added to the electrolyte. After 1 000 cycles of thermal shock, there was no cracking in the coating surface layer, which indicated that the CPED coating with ZrO2 nanoparticles addition possessed a good thermal shock resistance.
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