EFFECT OF LOAD AND TEMPERATURE ON HARDNESS OF ZrB2 COMPOSITES

Near-theoretical density specimens of ZrB2 and ZrB2 blended with 20 vol% SiC, and with 4 wt% B4C and 1.5 wt% carbon (added as phenolic resin) as sintering aids, were prepared by uniaxial pressing followed by pressureless sintering at 1800-2000 C. The Vickers hardness was measured using micro and mac...

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Bibliographic Details
Published inCeramic Engineering and Science Proceedings Vol. 31; pp. 59 - 68
Main Authors Wang, J, Giuliani, F, Vandeperre, L J
Format Journal Article
LanguageEnglish
Published 2010
Subjects
Carbon
Ceramics
Density
Diamond pyramid hardness
Hardness
Nanostructure
Phenolic resins
Silicon carbide
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Summary:Near-theoretical density specimens of ZrB2 and ZrB2 blended with 20 vol% SiC, and with 4 wt% B4C and 1.5 wt% carbon (added as phenolic resin) as sintering aids, were prepared by uniaxial pressing followed by pressureless sintering at 1800-2000 C. The Vickers hardness was measured using micro and macro indenters under loads of 500 g to 5 kg. The hardness of 20-22 GPa measured under low loads decreased to 10-16 GPa under higher loads, attributed to a change in deformation mechanism from one of resistance to plastic flow to one governed by porosity and resistance to cracking. The nano-indentation hardness of the composite, measured at high temperature, decreased rapidly with increasing temperature.
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ISBN:9780470594674
0470594675
ISSN:0196-6219
DOI:10.1002/9780470944127.ch7