Processing and characterization of ZrB2-SiCw ultra-high temperature ceramics

SiC whisker-reinforced ZrB2 ultra-high temperature ceramics containing 20 vol.% whisker were prepared in the temperature range of 1750-2000 deg C by hot pressing. The microstructure and mechanical properties of ZrB2-SiCW ultra-high temperature ceramics were examined. The results showed that SiC whis...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2009-03, Vol.472 (1-2), p.358-362
Main Authors: Zhang, Peng, Hu, Ping, Zhang, Xinghong, Han, Jiecai, Meng, Songhe
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
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:SiC whisker-reinforced ZrB2 ultra-high temperature ceramics containing 20 vol.% whisker were prepared in the temperature range of 1750-2000 deg C by hot pressing. The microstructure and mechanical properties of ZrB2-SiCW ultra-high temperature ceramics were examined. The results showed that SiC whiskers were not stable in the ZrB2 matrix above 1900 deg C and degenerated into particles. The sintering temperature for this material system should be lower than 1800 deg C to obtain high performance of ZrB2-SiCW. Significant improvement in fracture toughness of the material was obtained at 1800 deg C using fine ZrB2 particles compared to ZrB2 ceramic. The improvement of toughness was mainly attributed to whisker bridging and cracking deflection around whiskers.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.04.082