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Sintering studies on ultrafine ZrB2 powder produced by a self-propagating high-temperature synthesis process

Published online by Cambridge University Press:  31 January 2011

S. K. Mishra (Pathak) ,
S. Das ,
S. K. Das  and
P. Ramachandrarao
S. K. Mishra (Pathak)
Affiliation:
National Metallurgical Laboratory Jamshedpur, 831 007, India
S. Das
Affiliation:
National Metallurgical Laboratory Jamshedpur, 831 007, India
S. K. Das
Affiliation:
National Metallurgical Laboratory Jamshedpur, 831 007, India
P. Ramachandrarao
Affiliation:
National Metallurgical Laboratory Jamshedpur, 831 007, India
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Abstract

A detailed study on the sintering behavior of zirconium diboride powder produced by the self-propagating high-temperature synthesis (SHS) process was carried out in the temperature range of 1500–1800 °C. The fine powder prepared by the SHS process exhibited excellent sinterability and could be sintered at 1800 °C for 1 h to approximately 94% of the theoretical density. The apparent activation energy of densification in the range of 1500–1800 °C was estimated to be 248 ± 4 kJ mol−1. A zirconium dioxide layer formed on the surface of the sintered body and was attributed to boron oxide formation during sintering and concurrent surface oxidation by the oxygen generated from the reduction of boron oxide in the carbonaceous atmosphere. Sintering aids like Fe and Cr appeared to help in densification of ZrB2 powder.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2499 - 2504
Copyright
Copyright © Materials Research Society 2000

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References

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