Preparation of large-size Al2O3/GdAlO3/ZrO2 ternary eutectic ceramic rod by laser directed energy deposition and its microstructure homogenization mechanism

doi:10.1016/j.jmst.2021.01.025

Abstract

Abstract:

Laser 3D printing based on melt growth has great potential in rapid preparation of Al₂O₃-based eutectic ceramics. In this work, large-scale Al₂O₃/GdAlO₃/ZrO₂ ternary eutectic ceramic rod with diameter of 4-5 mm and height higher than 250 mm was additively manufactured by laser directed energy deposition. Especially, heat treatment was applied to eliminate the microstructure heterogeneity in the as-deposited eutectic ceramic, and the microstructure homogenization mechanism was studied in depth. The results indicate that colonies and banded structures completely disappear after the heat treatment, producing a homogeneous network eutectic structure. The microstructure homogenization is revealed to experience three stages of discontinuous coarsening, continuous coarsening and microstructure coalescence. Additionally, it is found that the eutectic spacing linearly increases with the heat treatment time, meaning that the coarsening behavior of the laser 3D-printed Al₂O₃/GdAlO₃/ZrO₂ eutectic ceramic satisfies well with the Graham-Kraft model.

Key words: Oxide eutectic ceramic, Laser 3D printing, Melt growth, Heat treatment, Microstructure homogenization

Haifang Liu, Haijun Su, Zhonglin Shen, Di Zhao, Yuan Liu, Yinuo Guo, Min Guo, Jun Zhang, Lin Liu, Hengzhi Fu. Preparation of large-size Al₂O₃/GdAlO₃/ZrO₂ ternary eutectic ceramic rod by laser directed energy deposition and its microstructure homogenization mechanism[J]. J. Mater. Sci. Technol., 2021, 85: 218-223.

Figures/Tables 5

Fig. 1. The preparation of Al2O3/GdAlO3/ZrO2 eutectic ceramic by LDED: (a) the schematic of the LDED process, (b) the as-deposited eutectic ceramic sample, (c) the annealed eutectic ceramic sample.

Fig. 2. XPS O 1s narrow scan spectra of the 3D-printed Al2O3/GdAlO3/ZrO2 eutectic ceramic.

Fig. 3. The as-deposited microstructure of the 3D-printed Al2O3/GdAlO3/ZrO2 eutectic ceramic: (a) transverse microstructure, (b) magnified view of (a), (c) longitudinal microstructure, (d) magnified view of (c).

Fig. 4. Corresponding microstructures of the 3D-printed Al2O3/GdAlO3/ZrO2 eutectic ceramic after heat treatment at 1500 °C for different time: (a) 50 h, (b) 100 h, (c) 200 h, (d) 300 h. 1 and 2 represent transverse and longitudinal microstructures, respectively.

Fig. 5. The relationship between corresponding characteristic parameters and heat treatment time: (a) plot of λ versus t, (b) plot of α(1/SV-1/SV0) versus t.

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Preparation of large-size Al₂O₃/GdAlO₃/ZrO₂ ternary eutectic ceramic rod by laser directed energy deposition and its microstructure homogenization mechanism

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