Comparison of deoxidation capability for preparation of low oxygen content powder from TiNi alloy scraps

• Low-oxygen-content powder was produced from TiNi alloy scraps.
• Three types of deoxidation after hydrogenation–dehydrogenation were applied.
• Main phases of the alloy powder prepared from the scraps were α-Ti and Ti2Ni.
• Minimum oxygen-content of TiNi powder was 1260 ppm.

Low oxygen content TiNi alloy powder was produced from TiNi alloy scraps by three types of deoxidation after the hydrogenation–dehydrogenation (HDH) process. The TiNi alloy scrap had a Ti:Ni weight ratio of 7:3. After the HDH process, the TiNi alloy powder was found to comprise α-Ti and Ti2Ni phases. It was also confirmed that the hydrogenation process of Ti–Ni alloy showed lower exothermal temperatures than that of pure Ti. After the process of contact deoxidation in the solid state, the oxygen content of the TiNi alloy powder was 1980 ppm. This deoxidized powder was treated again by the non-contact deoxidation process as a result of which the oxygen content decreased further to 1260 ppm. Applying only non-contact deoxidation after the HDH process allowed us to obtain an oxygen content of 1280 ppm, which is the same as that of the TiNi alloy powder obtained by both the contact and the non-contact deoxidation.

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