Microstructure of the directionally solidified ternary eutectic ceramic Al2O3/MgAl2O4/ZrO2

Zhai, Shuoyan; Liu, Juncheng; Jin, Wang

doi:10.1016/j.ceramint.2016.02.007

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…The density and volume ratio of Al 2 O 3 and MgAl 2 O 4 phase, as well as their other characteristic parameters, are listed in Table 1. However, Al 2 O 3 phase and MgAl 2 O 4 phase are hardly distinguished, and such similar situation had been found in Al 2 O 3 /MgAl 2 O 4 /ZrO 2 DSEC [18]. This is mainly due to the use of second electron as signal electrons in SEM.…”

Section: Resultsmentioning

confidence: 55%

Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic

Zhai

Cao

Liu

et al. 2022

Advances in Applied Ceramics

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Al 2 O 3 /MgAl 2 O 4 directionally solidified eutectic ceramic (DSEC) rods with Φ 10 mm were prepared with induction heating zone melting (IHZM) method. The phase components of the DSEC were composed of MgAl 2 O 4 phase growing along the preferred orientation 〈311〉 and Al 2 O 3 phases growing along the preferred orientation 〈110〉. In the DSEC, the Al 2 O 3 phase is the matrix phase mixed with part of MgAl 2 O 4 phase and the other part of MgAl 2 O 4 phase forms slice structure. Both the DSEC density and hardness decrease with the increase of the growth rate, due to the increase of micropores in DSEC with the higher growth rate. However, its fracture toughness improved due to the fine interface spacing toughening and the dispersion toughening. The highest hardness and fracture toughness of DSEC are 19.3 GPa and 3.74 MPa•m 1/2 , respectively, the toughening effect could be attributed to the crack deflection and bifurcation hindering the propagation of crack in DSEC.

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Section: Resultsmentioning

confidence: 55%

Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic

Zhai

Cao

Liu

et al. 2022

Advances in Applied Ceramics

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“…However, the growth rate plays a decisive role once the temperature gradient is determined [17,22]. During the preparation of eutectic materials, if the eutectic structure can grow steadily in the eutectic symbiotic region, a specific supercooling degree is required.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

et al. 2018

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Directionally solidified Al2O3/Er3Al5O12 (EAG) eutectic ceramic was prepared via vertical Bridgman method with high-frequency induction heating. The effects of the growth rate on the microstructure and mechanical properties of the solidified ceramic were investigated. The experimental results showed that there were no pores or amorphous phases in the directionally solidified Al2O3/EAG eutectic ceramic. Al2O3 phase was embedded in the EAG matrix phase, and the two phases were intertwined with each other to form a typical binary eutectic “hieroglyphic” structure. With the increase of growth rate, the phase size and spacing of the solidified Al2O3/EAG ceramic both decreased, and the growth rate and phase spacing satisfied the λ2v ≈ 60 formula of Jackson-Hunt theory. The cross section microstructure of the solidified ceramic always exhibited an irregular eutectic growth, while the longitudinal section microstructure presented a directional growth. The mechanical properties of the solidified ceramic gradually increased with the increase of growth rate, and the maximum hardness and fracture toughness could reach 21.57 GPa and 2.98 MPa·m1/2 respectively. It was considered that the crack deflection and branching could enhance the toughness of the solidified ceramic effectively.

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“…The fracture toughness was 7.0 ± 0.4 MPa•m 1/2 , 1.6 times the value of the ceramic without the multi-walked carbon nanotubes. Zhai [25] prepared the Al 2 O 3 /MgAl 2 O 4 /ZrO 2 ternary eutectic ceramic. The ZrO 2 phase acted as a whisker in the ceramic.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of Al2O3/Ti(C,N)-Added ZrO2 Whisker and NanoCoated CaF2@Al(OH)3 Powder

Xiao

Chen

et al. 2020

Applied Sciences

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The Al2O3/Ti(C,N) ceramic material added micron ZrO2 whisker and nano coated CaF2@Al(OH)3 powder was fabricated. The micron ZrO2 whisker was for the toughening and reinforcing phase and the nano coated CaF2@Al(OH)3 powder was the lubricant. For obtaining a ceramic material with optimal comprehensive mechanical properties and friction properties, the influences of different compositions of the ZrO2 whisker and nano coated CaF2@Al(OH)3 powder on the microstructure and mechanical properties were analyzed, respectively. The result demonstrated that as the addition of the ZrO2 whisker was 6 vol% and the addition of the nano coated CaF2@Al(OH)3 powder was 10 vol%, the optimal self-lubricating ceramic material had optimal mechanical properties. The hardness of the ceramic material was 16.72 GPa, the flexural strength was 520 MPa and the fracture toughness reached 7.16 MPa·m1/2. The formation of the intragranular structure, whisker toughening and the phase transition of ZrO2 were the main mechanisms.

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Microstructure of the directionally solidified ternary eutectic ceramic Al2O3/MgAl2O4/ZrO2

Cited by 13 publications

References 14 publications

Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic

Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

Preparation and Performance of Al2O3/Ti(C,N)-Added ZrO2 Whisker and NanoCoated CaF2@Al(OH)3 Powder

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Microstructure of the directionally solidified ternary eutectic ceramic Al2O3/MgAl2O4/ZrO2

Cited by 13 publications

References 14 publications

Microstructure characteristics and mechanical properties of Al2O3/MgAl2O4 directionally solidified eutectic ceramic

Microstructure characteristics and mechanical properties of Al2O3/MgAl2O4 directionally solidified eutectic ceramic

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

Preparation and Performance of Al2O3/Ti(C,N)-Added ZrO2 Whisker and NanoCoated CaF2@Al(OH)3 Powder

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Product

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Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic

Microstructure characteristics and mechanical properties of Al₂O₃/MgAl₂O₄ directionally solidified eutectic ceramic