Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic

W. J. Kelvin Chew; M. Amiriyan; A. Yaghoubi; S. Ramesh; J. Purbolaksono; R. Tolouei; W. D. Teng; D. K. Agrawal

doi:10.1016/j.ceramint.2014.05.045

Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic

W. J. Kelvin Chew
, M. Amiriyan
, A. Yaghoubi
, S. Ramesh
, J. Purbolaksono
, R. Tolouei
, W. D. Teng
, D. K. Agrawal

Materials Research Institute (MRI)

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

6 Scopus citations

Abstract

Zirconium diboride (ZrB₂) as an ultrahigh temperature ceramic (UHTC) with excellent electrical conductivity is a potential candidate for harsh-environment devices. Fabrication of ZrB₂-based materials however involves processing in the active oxidation regime (T>1200 K) leading to depletion of boron. We report a simple technique to prevent degradation during pressureless sintering of zirconia-matrix composites of ZrB₂. The composites prepared using this method reach the percolation threshold at ~10 wt% ZrB₂ and metal-like conductivity (~10⁵ S/m) at 25 wt% ZrB₂ in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.

Original language	English (US)
Pages (from-to)	13313-13320
Number of pages	8
Journal	Ceramics International
Volume	40
Issue number	8 PART B
DOIs	https://doi.org/10.1016/j.ceramint.2014.05.045
State	Published - Sep 2014

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2014.05.045

Cite this

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title = "Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic",

abstract = "Zirconium diboride (ZrB2) as an ultrahigh temperature ceramic (UHTC) with excellent electrical conductivity is a potential candidate for harsh-environment devices. Fabrication of ZrB2-based materials however involves processing in the active oxidation regime (T>1200 K) leading to depletion of boron. We report a simple technique to prevent degradation during pressureless sintering of zirconia-matrix composites of ZrB2. The composites prepared using this method reach the percolation threshold at \textasciitilde{}10 wt\% ZrB2 and metal-like conductivity (\textasciitilde{}105 S/m) at 25 wt\% ZrB2 in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.",

author = "\{Kelvin Chew\}, \{W. J.\} and M. Amiriyan and A. Yaghoubi and S. Ramesh and J. Purbolaksono and R. Tolouei and Teng, \{W. D.\} and Agrawal, \{D. K.\}",

year = "2014",

month = sep,

doi = "10.1016/j.ceramint.2014.05.045",

language = "English (US)",

volume = "40",

pages = "13313--13320",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd",

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}

TY - JOUR

T1 - Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic

AU - Kelvin Chew, W. J.

AU - Amiriyan, M.

AU - Yaghoubi, A.

AU - Ramesh, S.

AU - Purbolaksono, J.

AU - Tolouei, R.

AU - Teng, W. D.

AU - Agrawal, D. K.

PY - 2014/9

Y1 - 2014/9

N2 - Zirconium diboride (ZrB2) as an ultrahigh temperature ceramic (UHTC) with excellent electrical conductivity is a potential candidate for harsh-environment devices. Fabrication of ZrB2-based materials however involves processing in the active oxidation regime (T>1200 K) leading to depletion of boron. We report a simple technique to prevent degradation during pressureless sintering of zirconia-matrix composites of ZrB2. The composites prepared using this method reach the percolation threshold at ~10 wt% ZrB2 and metal-like conductivity (~105 S/m) at 25 wt% ZrB2 in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.

AB - Zirconium diboride (ZrB2) as an ultrahigh temperature ceramic (UHTC) with excellent electrical conductivity is a potential candidate for harsh-environment devices. Fabrication of ZrB2-based materials however involves processing in the active oxidation regime (T>1200 K) leading to depletion of boron. We report a simple technique to prevent degradation during pressureless sintering of zirconia-matrix composites of ZrB2. The composites prepared using this method reach the percolation threshold at ~10 wt% ZrB2 and metal-like conductivity (~105 S/m) at 25 wt% ZrB2 in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.

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UR - https://www.scopus.com/pages/publications/84903880873#tab=citedBy

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DO - 10.1016/j.ceramint.2014.05.045

M3 - Article

AN - SCOPUS:84903880873

SN - 0272-8842

VL - 40

SP - 13313

EP - 13320

JO - Ceramics International

JF - Ceramics International

IS - 8 PART B

ER -

Sintering properties and thermal depletion of boron in zirconia-zirconium diboride conductive ceramic

Abstract

All Science Journal Classification (ASJC) codes

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