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Competitive gas-solid reactions realized by ball milling of Zr in ammonia gas

Published online by Cambridge University Press:  31 January 2011

Ying Chen  and
Jim S. Williams
Ying Chen
Affiliation:
Department of Electronic Materials and Engineering, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
Jim S. Williams
Affiliation:
Department of Electronic Materials and Engineering, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
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Abstract

Competitive gas-solid reactions have been observed during high-energy ball milling of zirconium metal powder under an ammonia atmosphere at room temperature. The milling processes were investigated by monitoring pressure changes and subsequently analyzing milled powders with x-ray diffraction, thermal analysis, and elemental composition analysis. It is shown that during an early stage of milling, while the pressure is decreasing, a hydridation reaction predominates and leads to the formation of ZrH2 phase. During further milling the pressure increases again, and corresponds to a nitridation reaction between ZrH2 and available nitrogen (either excess NH3 or incorporated nitrogen in the powder) to form ZrN. Hydrogen gas is liberated and complete conversion to ZrN occurs after prolonged milling. The above reaction sequence was confirmed by the nitridation reaction of ZrH2 ball milled in NH3 atmosphere.

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Articles
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Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1500 - 1506
Copyright
Copyright © Materials Research Society 1996

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