< Back to previous page

Publication

Slow crack growth resistance of electrically conductive zirconia-based composites with non-oxide reinforcements

Journal Contribution - Journal Article

© 2018 Elsevier Ltd Slow crack growth (SCG) behavior of four zirconia-based composites reinforced with 40 vol% WC, TiC, NbC or TiCN were studied by means of double-torsion testing. Compared to monolithic zirconia, the composites had a higher resistance to fast fracture, i.e., higher fracture toughness. The extent of toughening depended on the reinforcement type, shifting the V-KI (crack velocity versus stress intensity factor) curve parallel to higher KI values. More importantly, these composites were less sensitive to SCG. Identical V-KI/KIC curves with steeper slopes compared to monolithic zirconia were observed for the investigated composites, independent on the reinforcement type. No rising R-curve was measured, at least in the crack-size domain investigated by SCG. Therefore, the higher SCG resistance of the composites was due to the intrinsic stress-assisted corrosion resistance of the covalent non-oxide secondary phase.
Journal: Journal of the European Ceramic Society
ISSN: 0955-2219
Issue: 2-3
Volume: 39
Pages: 641 - 646
Publication year:2019
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:1
CSS-citation score:1
Authors:International
Authors from:Higher Education
Accessibility:Open