Effects of ZrB2 reinforcement on microstructure and mechanical properties of a spark plasma sintered mullite-CNT composite

Yasin Orooji; Mohammad Reza Derakhshandeh; Ehsan Ghasali; Masoud Alizadeh; Mehdi Shahedi Asl; Touradj Ebadzadeh

doi:10.1016/j.ceramint.2019.05.113

Effects of ZrB₂ reinforcement on microstructure and mechanical properties of a spark plasma sintered mullite-CNT composite

Yasin Orooji, Mohammad Reza Derakhshandeh, Ehsan Ghasali^*, Masoud Alizadeh, Mehdi Shahedi Asl, Touradj Ebadzadeh

^*Corresponding author for this work

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

146 Citations (Scopus)

Abstract

A high density 10 wt% ZrB₂ and 1 wt%. CNT-reinforced mullite-based composite was prepared by spark plasma sintering (SPS) at temperature of 1350 °C, average heating rate of 60 °C/min and a soaking time of 5 min. Under these conditions, the sintered composite obtained a high hardness (16.24 ± 0.12 GPa), fracture toughness (4.18 ± 0.51 MPa m^1/2) and flexural strength (488 ± 21 MPa). The results of FESEM images showed a uniform distribution of the reinforcement particles in the composite. The resulting CNTs survived the sintering process and did not undergo any transformation. A transgranular fracture was predominantly observed in the fractured surface micrographs of the composite. The CNTs pullout and crack-bridging toughening mechanisms were also observed in the composite, which could have a significant contribution to the fracture energy and the interfacial adhesion.

Original language	English
Pages (from-to)	16015-16021
Number of pages	7
Journal	Ceramics International
Volume	45
Issue number	13
DOIs	https://doi.org/10.1016/j.ceramint.2019.05.113
Publication status	Published - Sept 2019
Externally published	Yes

Keywords

Ceramic matrix composite
CNT
Mullite
SPS
ZrB

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10.1016/j.ceramint.2019.05.113

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title = "Effects of ZrB2 reinforcement on microstructure and mechanical properties of a spark plasma sintered mullite-CNT composite",

abstract = "A high density 10 wt% ZrB2 and 1 wt%. CNT-reinforced mullite-based composite was prepared by spark plasma sintering (SPS) at temperature of 1350 °C, average heating rate of 60 °C/min and a soaking time of 5 min. Under these conditions, the sintered composite obtained a high hardness (16.24 ± 0.12 GPa), fracture toughness (4.18 ± 0.51 MPa m1/2) and flexural strength (488 ± 21 MPa). The results of FESEM images showed a uniform distribution of the reinforcement particles in the composite. The resulting CNTs survived the sintering process and did not undergo any transformation. A transgranular fracture was predominantly observed in the fractured surface micrographs of the composite. The CNTs pullout and crack-bridging toughening mechanisms were also observed in the composite, which could have a significant contribution to the fracture energy and the interfacial adhesion.",

keywords = "Ceramic matrix composite, CNT, Mullite, SPS, ZrB",

author = "Yasin Orooji and Derakhshandeh, {Mohammad Reza} and Ehsan Ghasali and Masoud Alizadeh and {Shahedi Asl}, Mehdi and Touradj Ebadzadeh",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd and Techna Group S.r.l.",

year = "2019",

month = sep,

doi = "10.1016/j.ceramint.2019.05.113",

language = "English",

volume = "45",

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T1 - Effects of ZrB2 reinforcement on microstructure and mechanical properties of a spark plasma sintered mullite-CNT composite

AU - Orooji, Yasin

AU - Derakhshandeh, Mohammad Reza

AU - Ghasali, Ehsan

AU - Alizadeh, Masoud

AU - Shahedi Asl, Mehdi

AU - Ebadzadeh, Touradj

PY - 2019/9

Y1 - 2019/9

N2 - A high density 10 wt% ZrB2 and 1 wt%. CNT-reinforced mullite-based composite was prepared by spark plasma sintering (SPS) at temperature of 1350 °C, average heating rate of 60 °C/min and a soaking time of 5 min. Under these conditions, the sintered composite obtained a high hardness (16.24 ± 0.12 GPa), fracture toughness (4.18 ± 0.51 MPa m1/2) and flexural strength (488 ± 21 MPa). The results of FESEM images showed a uniform distribution of the reinforcement particles in the composite. The resulting CNTs survived the sintering process and did not undergo any transformation. A transgranular fracture was predominantly observed in the fractured surface micrographs of the composite. The CNTs pullout and crack-bridging toughening mechanisms were also observed in the composite, which could have a significant contribution to the fracture energy and the interfacial adhesion.

AB - A high density 10 wt% ZrB2 and 1 wt%. CNT-reinforced mullite-based composite was prepared by spark plasma sintering (SPS) at temperature of 1350 °C, average heating rate of 60 °C/min and a soaking time of 5 min. Under these conditions, the sintered composite obtained a high hardness (16.24 ± 0.12 GPa), fracture toughness (4.18 ± 0.51 MPa m1/2) and flexural strength (488 ± 21 MPa). The results of FESEM images showed a uniform distribution of the reinforcement particles in the composite. The resulting CNTs survived the sintering process and did not undergo any transformation. A transgranular fracture was predominantly observed in the fractured surface micrographs of the composite. The CNTs pullout and crack-bridging toughening mechanisms were also observed in the composite, which could have a significant contribution to the fracture energy and the interfacial adhesion.

KW - Ceramic matrix composite

KW - CNT

KW - Mullite

KW - SPS

KW - ZrB

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DO - 10.1016/j.ceramint.2019.05.113

M3 - Article

AN - SCOPUS:85065799307

SN - 0272-8842

VL - 45

SP - 16015

EP - 16021

JO - Ceramics International

JF - Ceramics International

IS - 13

ER -

Effects of ZrB₂ reinforcement on microstructure and mechanical properties of a spark plasma sintered mullite-CNT composite

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