Effect of laser focus shift on the forming quality, microstructure and mechanical properties of additively manufactured Al2O3–ZrO2 eutectic ceramics

Xiong, Zhiwei; Zhang, Kai; Zhu, Zhiguang; Liu, Tingting; Zhang, Yang; Li, Shurui; Liao, Wenhe

doi:10.1016/j.ceramint.2023.08.275

Cited by 12 publications

(2 citation statements)

References 74 publications

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“…42 Formation of dendritic crystals has been observed in glass-ceramics 43,44 and eutectic ceramics. [45][46][47] Several factors affect the formation of dendritic crystals, such as doping, 44 external fields, 46 chemical composition, 43 temperature gradient, 48 etc. In this study, firework-like microcrystallites did not form in the undoped 55Zr sample (Figure 4), neither did they form in the middle or the anode region in the doped 55Zr sample.…”

Section: Growth Mechanism Of Equiaxial and Firework-like Microcrystal...mentioning

confidence: 99%

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Fu,

Yu,

Wen

et al. 2024

J Am Ceram Soc.

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Flash sintering has been used to consolidate a wide range of ceramics and ceramic composites. However, flash sintering of ceramic nanocomposite with a substantial amorphous phase is rarely studied. Meanwhile, the effects of yttrium addition on the flash sintering behaviors and microstructures of ZrO2‐based ceramic nanocomposite remain unknown. Herein, ZrO2‐SiO2 crystalline‐amorphous ceramic nanocomposites (CACNs) with different contents of amorphous phase and two types of yttrium dopants were sintered by flash sintering. Results showed that the content of amorphous phase (SiO2) had significant effects on the flash sintering behavior. The CACN with 65 mol% SiO2 was nonflash sinterable due to the high electric resistivity of SiO2, whereas, the CACN with 45 mol% SiO2 can be flash sintered to high densification within 35 seconds. The flash‐sintered CACNs consisted of ZrO2 nanocrystallites distributed in an amorphous SiO2 matrix. Flash sintering enhanced the tetragonal‐to‐monoclinic phase transformation of ZrO2. In addition, influences of yttrium dopant on CACNs were also investigated. Yttrium dopants can rapidly dissolve in ZrO2 lattices and show a tetragonal phase stabilization effect during flash sintering. Firework‐like ZrO2 microcrystallites formed by dendritic growth were observed close to the cathode region, which was attributed to athermal electric field effects and the formation and aggregation of oxygen vacancies at the cathode region. The results would provide guidance for fabricating CACNs via flash sintering.

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Section: Growth Mechanism Of Equiaxial and Firework-like Microcrystal...mentioning

confidence: 99%

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Fu,

Yu,

Wen

et al. 2024

J Am Ceram Soc.

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“…The microstructures mentioned in this study have been previously discussed by Xiong et al, 46,47 and this paper focuses on crack propagation behavior within these microstructures. To investigate the crack propagation in these three typical microstructures, a diamond-shaped indent was applied on the sample surface using a hardness tester.…”

Section: Cracks Propagation In Typical Microstructuresmentioning

confidence: 99%

Morphology and formation mechanism of cracks in Al₂O₃–ZrO₂ eutectic ceramics fabricated via laser powder bed fusion

Zhang,

Chen

et al. 2023

J Am Ceram Soc.

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The cracks in Al2O3–ZrO2 eutectic ceramics produced by laser powder bed fusion (LPBF) have a significant impact on their practical applications in various industries. In order to understand the factors influencing crack formation, a systematic study of the characterization and propagation of cracks in single‐track, multi‐track, and bulk samples by varying the process parameters has been carried out in this research. The results showed that parallel cracks can be healed by reducing the scanning spacing and scanning length. Additionally, it was found that using a modest scanning speed and a shorter length can minimize the accumulation of thermal stress, resulting in the suppress crack formation. Based on this conclusion, a crack‐free Al2O3–ZrO2 eutectic ceramic sample was finally obtained under the optimized parameters with the power of 100 W, the scanning speed of 100 mm/s, the hatch spacing of 100 μm, the scanning length of 3 mm, and the layer thickness of 50 μm. Additionally, three typical microstructures, including eutectic, cellular, and dendritic structures, were identified in the LPBF‐fabricated Al2O3–ZrO2 samples. The cellular microstructure showed improved crack inhibition capability due to the deflection and pinning effects. Cracks expand more easily in dendritic and eutectic microstructures, where anisotropy is more prominent.

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A critical review of direct laser additive manufacturing ceramics

Zhao,

Bi,

Chen

et al. 2024

Int J Miner Metall Mater

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Effect of laser focus shift on the forming quality, microstructure and mechanical properties of additively manufactured Al2O3–ZrO2 eutectic ceramics

Cited by 12 publications

References 74 publications

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Morphology and formation mechanism of cracks in Al₂O₃–ZrO₂ eutectic ceramics fabricated via laser powder bed fusion

A critical review of direct laser additive manufacturing ceramics

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Effect of laser focus shift on the forming quality, microstructure and mechanical properties of additively manufactured Al2O3–ZrO2 eutectic ceramics

Cited by 12 publications

References 74 publications

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO2–SiO2 ceramic nanocomposites

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO2–SiO2 ceramic nanocomposites

Morphology and formation mechanism of cracks in Al2O3–ZrO2 eutectic ceramics fabricated via laser powder bed fusion

A critical review of direct laser additive manufacturing ceramics

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Product

Resources

About

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Effects of amorphous phase and yttrium on flash sintering and microstructures of ZrO₂–SiO₂ ceramic nanocomposites

Morphology and formation mechanism of cracks in Al₂O₃–ZrO₂ eutectic ceramics fabricated via laser powder bed fusion