TY - JOUR
T1 - Insights into high thermal stability of laser additively manufactured Al2O3/GdAlO3/ZrO2 eutectic ceramics under high temperatures
AU - Liu, Haifang
AU - Su, Haijun
AU - Shen, Zhonglin
AU - Zhao, Di
AU - Liu, Yuan
AU - Guo, Yinuo
AU - Zhang, Jun
AU - Liu, Lin
AU - Fu, Hengzhi
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12
Y1 - 2021/12
N2 - Laser additive manufacturing techniques have been considered to be the most promising methods to fabricate melt-grown Al2O3-based eutectic ceramics which are potential candidates for high temperature structural applications. In this paper, Al2O3/GdAlO3/ZrO2 ternary eutectic ceramic was additively manufactured based on one-step melt-growth by laser directed energy deposition, and its thermal stability under high temperatures was studied. The results indicate that the as-solidified eutectic composite consists of ultrafine phases of α-Al2O3, GdAlO3 and t-ZrO2, and presents an irregular eutectic morphology with amounts of terminations and branches. The 3D-printed eutectic ceramic exhibits a superior thermal stability that no mass variation and no phase transition occur even after annealed at 1500 °C for 200 h. In addition, the submicron-scaled eutectic microstructure and the polished surface topography can maintain stability up to 1400 °C which is higher than 80% of its melting point (>0.8 Tm). With further increasing the temperature, obvious microstructure coarsening, and surface holes formation occur, leading to the severely deterioration of the mechanical property. The hardness of the as-deposited eutectic ceramic rapidly decreases from 15.84 ± 0.61 GPa to 13.01 ± 0.40 GPa after 200 h annealed at 1500 °C. The results indicate that the additively manufactured Al2O3-based eutectic ceramics have great potential to be long-time high-temperature structural materials applied at elevated temperatures.
AB - Laser additive manufacturing techniques have been considered to be the most promising methods to fabricate melt-grown Al2O3-based eutectic ceramics which are potential candidates for high temperature structural applications. In this paper, Al2O3/GdAlO3/ZrO2 ternary eutectic ceramic was additively manufactured based on one-step melt-growth by laser directed energy deposition, and its thermal stability under high temperatures was studied. The results indicate that the as-solidified eutectic composite consists of ultrafine phases of α-Al2O3, GdAlO3 and t-ZrO2, and presents an irregular eutectic morphology with amounts of terminations and branches. The 3D-printed eutectic ceramic exhibits a superior thermal stability that no mass variation and no phase transition occur even after annealed at 1500 °C for 200 h. In addition, the submicron-scaled eutectic microstructure and the polished surface topography can maintain stability up to 1400 °C which is higher than 80% of its melting point (>0.8 Tm). With further increasing the temperature, obvious microstructure coarsening, and surface holes formation occur, leading to the severely deterioration of the mechanical property. The hardness of the as-deposited eutectic ceramic rapidly decreases from 15.84 ± 0.61 GPa to 13.01 ± 0.40 GPa after 200 h annealed at 1500 °C. The results indicate that the additively manufactured Al2O3-based eutectic ceramics have great potential to be long-time high-temperature structural materials applied at elevated temperatures.
KW - Additive manufacturing
KW - Laser directed energy deposition
KW - Oxide eutectic ceramic
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85118891798&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2021.102425
DO - 10.1016/j.addma.2021.102425
M3 - 文章
AN - SCOPUS:85118891798
SN - 2214-8604
VL - 48
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 102425
ER -