Toughness enhancement and thermal properties of graphene-CNTs reinforced Al2O3 ceramic hybrid nanocomposites

W. A. Shah; X. Luo; B. I. Rabiu; B. Huang; Y. Q. Yang

doi:10.1016/j.cplett.2021.138978

Toughness enhancement and thermal properties of graphene-CNTs reinforced Al₂O₃ ceramic hybrid nanocomposites

W. A. Shah, X. Luo, B. I. Rabiu, B. Huang, Y. Q. Yang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Graphene/CNTs-reinforced alumina ceramic composites were prepared by spark plasma sintering (SPS) method at 1500 °C. The distribution behaviors of graphene/CNTs reinforcements in alumina matrix composite were studied and mechanical properties of the composite were tested. The structural integrity of the graphene after sintering was analyzed by Raman spectroscopy. The composites show inter and trans-granular fracture behaviors. Many toughening mechanisms such as graphene and CNTs necking, crack bridging, crack deflection and crack branching were observed. The experiment-based calculation of heat capacity of the composite was presented in details. The thermal diffusivity and thermal conductivity of the nanocomposites were discussed. The thermal conductivity increased with the increase of grain size. The pure alumina had the highest thermal conductivity, which was 23.9 Wm⁻¹ K⁻¹.

Original language	English
Article number	138978
Journal	Chemical Physics Letters
Volume	781
DOIs	https://doi.org/10.1016/j.cplett.2021.138978
State	Published - 16 Oct 2021

Keywords

Alumina
CNTs
Fracture toughness
Graphene
Hardness
SPS
Thermal conductivity

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10.1016/j.cplett.2021.138978

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title = "Toughness enhancement and thermal properties of graphene-CNTs reinforced Al2O3 ceramic hybrid nanocomposites",

abstract = "Graphene/CNTs-reinforced alumina ceramic composites were prepared by spark plasma sintering (SPS) method at 1500 °C. The distribution behaviors of graphene/CNTs reinforcements in alumina matrix composite were studied and mechanical properties of the composite were tested. The structural integrity of the graphene after sintering was analyzed by Raman spectroscopy. The composites show inter and trans-granular fracture behaviors. Many toughening mechanisms such as graphene and CNTs necking, crack bridging, crack deflection and crack branching were observed. The experiment-based calculation of heat capacity of the composite was presented in details. The thermal diffusivity and thermal conductivity of the nanocomposites were discussed. The thermal conductivity increased with the increase of grain size. The pure alumina had the highest thermal conductivity, which was 23.9 Wm−1 K−1.",

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T1 - Toughness enhancement and thermal properties of graphene-CNTs reinforced Al2O3 ceramic hybrid nanocomposites

AU - Shah, W. A.

AU - Luo, X.

AU - Rabiu, B. I.

AU - Huang, B.

AU - Yang, Y. Q.

PY - 2021/10/16

Y1 - 2021/10/16

N2 - Graphene/CNTs-reinforced alumina ceramic composites were prepared by spark plasma sintering (SPS) method at 1500 °C. The distribution behaviors of graphene/CNTs reinforcements in alumina matrix composite were studied and mechanical properties of the composite were tested. The structural integrity of the graphene after sintering was analyzed by Raman spectroscopy. The composites show inter and trans-granular fracture behaviors. Many toughening mechanisms such as graphene and CNTs necking, crack bridging, crack deflection and crack branching were observed. The experiment-based calculation of heat capacity of the composite was presented in details. The thermal diffusivity and thermal conductivity of the nanocomposites were discussed. The thermal conductivity increased with the increase of grain size. The pure alumina had the highest thermal conductivity, which was 23.9 Wm−1 K−1.

AB - Graphene/CNTs-reinforced alumina ceramic composites were prepared by spark plasma sintering (SPS) method at 1500 °C. The distribution behaviors of graphene/CNTs reinforcements in alumina matrix composite were studied and mechanical properties of the composite were tested. The structural integrity of the graphene after sintering was analyzed by Raman spectroscopy. The composites show inter and trans-granular fracture behaviors. Many toughening mechanisms such as graphene and CNTs necking, crack bridging, crack deflection and crack branching were observed. The experiment-based calculation of heat capacity of the composite was presented in details. The thermal diffusivity and thermal conductivity of the nanocomposites were discussed. The thermal conductivity increased with the increase of grain size. The pure alumina had the highest thermal conductivity, which was 23.9 Wm−1 K−1.

KW - Alumina

KW - CNTs

KW - Fracture toughness

KW - Graphene

KW - Hardness

KW - SPS

KW - Thermal conductivity

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DO - 10.1016/j.cplett.2021.138978

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JO - Chemical Physics Letters

JF - Chemical Physics Letters

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ER -

Toughness enhancement and thermal properties of graphene-CNTs reinforced Al₂O₃ ceramic hybrid nanocomposites

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Keywords

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