The preparation of hafnium-tantalum alloy by carbide-oxide reaction

Garg, S. P. ; Venkataramani, R. ; Sundaram, C. V. (1976) The preparation of hafnium-tantalum alloy by carbide-oxide reaction Journal of the Less Common Metals, 50 (2). pp. 245-251. ISSN 0022-5088

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The direct preparation of Hf-Ta alloys (40-50% Ta) by reaction between HfC and Ta2O5 has been investigated. By progressive heat soaking of the pelletised charge up to 2000°C under a dynamic vacuum, followed by electron-beam melting, Hf-Ta alloys containing 0.29% carbon and 0.021% oxygen have been prepared. The influence of different process parameters, such as the initial oxygen: carbon ratio in the charge, temperature, and time of heat soak, on the final purity of the alloy, has been examined. The thermodynamics of the reaction are discussed. The overall material balance for the reaction indicates removal of oxygen both through carbothermic reduction (as CO) and through sacrificial deoxidation (as HfO). No tantalum loss was observed during the reaction.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:41761
Deposited On:31 May 2011 06:41
Last Modified:31 May 2011 06:41

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