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

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>1200K) leading to depletion of boro...

Full description

Saved in:
Bibliographic Details
Published in:Ceramics international 2014-09, Vol.40 (8), p.13313-13320
Main Authors: Kelvin Chew, W.J., Amiriyan, M., Yaghoubi, A., Ramesh, S., Purbolaksono, J., Tolouei, R., Teng, W.D., Agrawal, D.K.
Format: Article
Language:English
Subjects:
A. Sintering
B. Composites
C. Electrical conductivity
E. Functional applications
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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>1200K) 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 ~10wt% ZrB2 and metal-like conductivity (~105S/m) at 25wt% ZrB2 in agreement with the general effective media theory. The improved mechanical properties are also discussed in terms of various toughening mechanisms.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.05.045