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MICROSTRUCTURE OF PLASMA-SPRAYED Al₂O₃–ZrO₂ COMPOSITE COATINGS

LUBIN CHEN

School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China

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CHUANZHONG CHEN

School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China

Corresponding author.

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LIANG ZHANG

School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China

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BIAO QI

School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China

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, and

TING-QUAN LEI

School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China

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https://doi.org/10.1142/S0218625X06008475Cited by:1 (Source: Crossref)

Abstract

Thermal barrier coatings of Al₂O₃–ZrO₂ were prepared by air plasma spraying on the surface of 20G steel. Phase constitution, microstructures and elemental distributions of the coatings were studied by X-ray diffraction, scanning electron microscope and electron probe X-ray microanalysis. The results show that the plasma spray coating mainly consists of α-Al₂O₃, c-ZrO₂, and t-ZrO₂. The bond state of the interface between the top layer and bond layer is fine, and the bond layer has a good combination with the substrate. ZrO₂ and Al₂O₃ structures can closely integrate together and form compact top layer system.

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