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https://hdl.handle.net/2115/50311

Direct Production of Ti-29Nb-13Ta-4.6Zr Biomedical Alloy from Oxide Mixture in Molten CaCl2

英語

2009

日本学術振興会 加工プロセスによる材料新機能発現第176委員会

Proceedings of Processing and Fabrication of Advanced Materials XVIII

2

815-824

Ti-29Nb-13Ta-4.6Zr(TNTZ) alloy was successfully produced by co-reduction of oxide mixture, which consisted of TiO2, Nb205, Ta205, and ZrO2. This method uses high reduction capacity of deposited Ca or Ca-condensed molten salt. Ca was produced by controlled-potential electrolysis of CaO in molten CaCl2 under 3.2V at 1173K with carbon anode and Ti cathode. Supplied charge Q was varied in the range of O～400% of theoretical charge (Q0) to generate the required amount of Ca to reduce the oxide mixture. The oxygen concentration of the obtained powder sample decreased monotonously as the supplied charge increased. 1.37 mass% oxygen could be attained at Q/Q0 =165% and 1900 mass ppm at Q/Q0 =323%. X-ray diffraction measurements identified the sample which has low oxygen concentration as the mixture of Ti-based BCC solid solution and a small amount of HCP solid solution. The electron probe microanalysis showed that the composition of this sample was slightly different from the targeted composition due to difference of reduction rate of the component oxides. After sintering at 1300K for 54ks, the HCP phase disappeared and the compositional homogeneity was improved within ±3.5mass% to the targeted composition.

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