One-step additive manufacturing and microstructure evolution of melt-grown Al2O3/GdAlO3/ZrO2 eutectic ceramics by laser directed energy deposition

Liu, Haifang; Su, Haijun; Shen, Zhonglin; Zhao, Di; Liu, Yuan; Guo, Yinuo; Guo, Huitian; Guo, Min; Xie, Keyu; Jun, Zhang; Liu, Lin; Fu, Hengzhi

doi:10.1016/j.jeurceramsoc.2021.01.047

Cited by 48 publications

(23 citation statements)

References 52 publications

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“…1(c) that the appearance and interior of the 3D-printed Al 2 O 3 /GdAlO 3 /ZrO 2 eutectic samples are dark gray. As mentioned above, the extrinsic color of the oxide ceramics is resulted from the formation of oxygen vacancies [20][21][22][23]26,28]. For example, the color of the vacancy-rich WO 3 sample presents dark blue [28], and the laser 3D-printed Al 2 O 3 -YAG-ZrO 2 eutectic ceramic possesses a dark brown color [20].…”

Section: Formation Mechanism Of Oxygen Vacancies During Laser 3d Prin...mentioning

confidence: 99%

“…In recent years, laser three-dimensional (3D) printing has rapidly developed into a key strategic technology for technological innovation and industrial sustainability owing to its unparalleled advantage in one-step integral fabrication of end-use components with complex shapes [10][11][12][13]. In the field of oxide eutectic ceramic manufacturing, studies on laser 3D printing have sprung up in the past decade for the purpose of developing new solidification technique to prepare complex-structured eutectic parts [14][15][16][17][18][19][20][21][22]. Up to date, high-quality eutectic samples with shapes of rod [15,21,22], rectangular plate [15], framework for dental restoration [16], arc [17], cylinder [17], and thin wall [17,20,21] have been successfully additively manufactured based on melt growth.…”

Section: Introduction mentioning

confidence: 99%

“…In the field of oxide eutectic ceramic manufacturing, studies on laser 3D printing have sprung up in the past decade for the purpose of developing new solidification technique to prepare complex-structured eutectic parts [14][15][16][17][18][19][20][21][22]. Up to date, high-quality eutectic samples with shapes of rod [15,21,22], rectangular plate [15], framework for dental restoration [16], arc [17], cylinder [17], and thin wall [17,20,21] have been successfully additively manufactured based on melt growth.…”

Section: Introduction mentioning

confidence: 99%

“…It is found that the preparation of eutectic ceramic by laser 3D printing must be carried out under the protection of high-purity inert gas so as to inhibit the formation of pores during the transient meltingsolidification process [15][16][17][18][19][20][21][22]. As a result, the as-deposited eutectic sample presents an extrinsic color [20][21][22][23]. For instance, the intrinsic color of the melt-grown Al 2 O 3 /GdAlO 3 /ZrO 2 eutectic ceramic is white [24], while the laser 3D-printed sample presents dark gray [21,22].…”

Section: Introduction mentioning

confidence: 99%

“…As a result, the as-deposited eutectic sample presents an extrinsic color [20][21][22][23]. For instance, the intrinsic color of the melt-grown Al 2 O 3 /GdAlO 3 /ZrO 2 eutectic ceramic is white [24], while the laser 3D-printed sample presents dark gray [21,22]. Reference [22] has demonstrated that the color change is attributed to the formation of oxygen vacancies in the as-deposited oxide eutectic sample.…”

Section: Introduction mentioning

confidence: 99%

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Formation mechanism and roles of oxygen vacancies in melt-grown Al2O3/GdAlO3/ZrO2 eutectic ceramic by laser 3D printing

Liu

Shen

et al. 2022

J Adv Ceram

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Laser three-dimensional (3D) printing has become a significant technique to fabricate high-performance Al2O3-based eutectic ceramics based on melt growth. However, oxygen vacancies are inevitable crystal defects during this process, and their formation mechanism and roles in the as-deposited ceramics are still unclear. In this paper, Al2O3/GdAlO3/ZrO2 ternary eutectic ceramics were prepared by laser 3D printing, and the formation mechanism of the oxygen vacancies was revealed by conducting a well-designed annealing experiment. In addition, the effects of the oxygen vacancies on the structure and mechanical property of the as-solidified eutectic ceramic were investigated. The formation of oxygen vacancies is revealed to be a result of the transfer of oxygen atoms from the oxide ceramic to the oxygen-deficient atmosphere by means of vacancy migration mechanism. Besides, the presence of oxygen vacancies has no obvious effects on crystalline structure and microstructure of the additively manufactured eutectic ceramic. However, the chemical bond property changes to some extent due to the formation of these crystal defects, which may affect the mechanical property of the as-deposited eutectic ceramic. It is found that the hardness decreases by 3.9%, and the fracture toughness increases by 13.3% after removing the oxygen vacancies. The results may provide a potential strategy to regulate the mechanical property of the oxide ceramic materials.

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