Preparation of MWNTs/Al2O3 composites and their mechanical and electrical properties

Jinpeng Fan; Daqing Zhao; Zening Xu; Minsheng Wu

doi:10.1360/102004-148

Preparation of MWNTs/Al₂O₃ composites and their mechanical and electrical properties

Jinpeng Fan, Daqing Zhao^*, Zening Xu, Minsheng Wu

^*Corresponding author for this work

Tsinghua University

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

8 Citations (Scopus)

Abstract

The mechanical and electrical properties of MWNTs/Al₂O ₃ composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m^1/2, which is 80% higher than that of pure Al₂O₃ obtained in the same conditions. The main toughening mechanism is CNTs' pinning alumina grain boundaries, and the pullout of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite obtained is 3.97 MPa·m^1/2. Furthermore, the electrical resistivity is as low as 8.4×10^-3 Ω-m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. Copyright by Science in China Press 2005.

Original language	English
Pages (from-to)	622-631
Number of pages	10
Journal	Science in China, Series E: Technological Sciences
Volume	48
Issue number	6
DOIs	https://doi.org/10.1360/102004-148
Publication status	Published - Dec 2005
Externally published	Yes

Keywords

Alumina
Composite
Electrical properties
Fracture toughness
MWNTs

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10.1360/102004-148

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title = "Preparation of MWNTs/Al2O3 composites and their mechanical and electrical properties",

abstract = "The mechanical and electrical properties of MWNTs/Al2O 3 composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m1/2, which is 80% higher than that of pure Al2O3 obtained in the same conditions. The main toughening mechanism is CNTs' pinning alumina grain boundaries, and the pullout of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite obtained is 3.97 MPa·m1/2. Furthermore, the electrical resistivity is as low as 8.4×10-3 Ω-m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. Copyright by Science in China Press 2005.",

keywords = "Alumina, Composite, Electrical properties, Fracture toughness, MWNTs",

author = "Jinpeng Fan and Daqing Zhao and Zening Xu and Minsheng Wu",

year = "2005",

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TY - JOUR

T1 - Preparation of MWNTs/Al2O3 composites and their mechanical and electrical properties

AU - Fan, Jinpeng

AU - Zhao, Daqing

AU - Xu, Zening

AU - Wu, Minsheng

PY - 2005/12

Y1 - 2005/12

N2 - The mechanical and electrical properties of MWNTs/Al2O 3 composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m1/2, which is 80% higher than that of pure Al2O3 obtained in the same conditions. The main toughening mechanism is CNTs' pinning alumina grain boundaries, and the pullout of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite obtained is 3.97 MPa·m1/2. Furthermore, the electrical resistivity is as low as 8.4×10-3 Ω-m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. Copyright by Science in China Press 2005.

AB - The mechanical and electrical properties of MWNTs/Al2O 3 composite prepared fabricated by hot pressing are investigated. The relation between properties and microstructure of composites is also discussed. With 4wt% MWNTs as reinforcement, the fracture toughness of composite obtained reaches 5.55 MPa·m1/2, which is 80% higher than that of pure Al2O3 obtained in the same conditions. The main toughening mechanism is CNTs' pinning alumina grain boundaries, and the pullout of CNTs takes effect also. Through adding 2wt% MWNTs and altering the mix method, the fracture toughness of the composite obtained is 3.97 MPa·m1/2. Furthermore, the electrical resistivity is as low as 8.4×10-3 Ω-m, decreasing by 14 orders of magnitude compared with pure alumina ceramics. The function of CNTs in composite is related to the distribution state of CNTs in composite, and the distribution state of CNTs in matrix is dependent on preparation procedures. Copyright by Science in China Press 2005.

KW - Alumina

KW - Composite

KW - Electrical properties

KW - Fracture toughness

KW - MWNTs

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DO - 10.1360/102004-148

M3 - Article

AN - SCOPUS:34147130186

SN - 1006-9321

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JO - Science in China, Series E: Technological Sciences

JF - Science in China, Series E: Technological Sciences

IS - 6

ER -

Preparation of MWNTs/Al₂O₃ composites and their mechanical and electrical properties

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Keywords

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