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

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Title: Direct Production of Ti-29Nb-13Ta-4.6Zr Biomedical Alloy from Oxide Mixture in Molten CaCl2
Authors: Osaki, Shogo Browse this author
Sakai, Hiroshi Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Issue Date: 2009
Publisher: 176th Committee on Process Created Materials Function, Japan Society for the Promotion of Science
Journal Title: Proceedings of Processing and Fabrication of Advanced Materials XVIII
Volume: 2
Start Page: 815
End Page: 824
Abstract: 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.
Conference Name: Committee on Process Created Materials Function
Conference Sequence: 176
Type: proceedings
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鈴木 亮輔

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