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Author:

Li, Yong-Li (Li, Yong-Li.) | Zhang, Jiu-Xing (Zhang, Jiu-Xing.) | Qiao, Guan-Jun (Qiao, Guan-Jun.) | Jin, Zhi-Hao (Jin, Zhi-Hao.)

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Abstract:

Thermal shock resistance of machinable Al2O3/BN nanocomposites, fabricated via chemical coating process and subsequently hot-pressing, was investigated. The experimental results revealed both thermal fracture resistance and thermal damage resistance of the nanocomposites were obviously improved in comparison with Al2O3 monolith. A temperature difference (Δ Tc) increase of about 100 percent, from 195°C for Al2O3 monolith to 395°C for the nanocomposites was found in this work, which was mainly attributed to the low Young's modulus and relatively high strength due to the soft h-BN addition and its homogegeous distributions with super fine grain size. Layer-structured h-BN can help to relax stress and absorb energy through microcracking, and then prevent sudden decrease of the residual strength after thermal shock.

Keyword:

Machinability Boron compounds Hot pressing Elastic moduli Nanostructured materials Alumina Microcracking Coatings Nanocomposites Thermal shock

Author Community:

  • [ 1 ] [Li, Yong-Li]Key Laboratory of Advanced Functional Materials, Beijing University of Technology, Beijing 100022, China
  • [ 2 ] [Zhang, Jiu-Xing]Key Laboratory of Advanced Functional Materials, Beijing University of Technology, Beijing 100022, China
  • [ 3 ] [Qiao, Guan-Jun]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
  • [ 4 ] [Jin, Zhi-Hao]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

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Source :

Material Science and Technology

ISSN: 1005-0299

Year: 2007

Issue: 2

Volume: 15

Page: 248-250

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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