EFFECTS OF YTTRIUM NITRATE ON MICROSTRUCTURE AND HIGH TEMPERATURE RESISTANCE OF ZrO2–Y2O3 CERAMIC COATINGS PREPARED BY A MODIFIED PEO PROCESS ON AN Al–12Si ALLOY

Wang Ping, Zhou Liguo, Han Jing and Guo Yongchun
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Wang Ping: School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, P. R. China
Zhou Liguo: School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, P. R. China
Han Jing: School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, P. R. China
Guo Yongchun: School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue Supp02, 1-11

Abstract: A ZrO2–Al2O3 ceramic coating and YSZ–Al2O3 coating were prepared on ZAlSil2Cu3Ni2 alloys by a modified plasma electrolytic oxidation (PEO) in zirconium salt solution. The microstructure, heat-insulating and high temperature oxidation properties were investigated by SEM, XRD and a fabricated heat insulation temperature testing device. The results showed that the surface of the YSZ–Al2O3 coating was composed of fine particles and had lower roughness. Yttrium partially stabilized the zirconia solid solution (Y0.15Zr0.85O1.93□0.07) which was formed in zirconium yttrium salt solution with a higher reaction temperature. The growth rate of the YSZ–Al2O3 coating was greater than the ZrO2–Al2O3 coating. Especially, the outward growth obviously improves. Furthermore, the heat insulation property of the coating enhances. The curves of the weight gains in the sample with YSZ–Al2O3 coating showed a logarithmic shape under the high temperature oxidation treatment of 400∘C. The weight gains of the sample with YSZ–Al2O3 coating were relatively lower than that of the as-coated sample. The ceramic layer had good high temperature stability.

Keywords: Al–12Si alloys; rare yttrium salt; plasma electrolytic oxidation; ZrO2–Y2O3 ceramic coating; heat-insulating property; high temperature oxidation resistance (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X18500269

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