Powder Forming Process from Machined Titanium Chips via Heat Treatment in Hydrogen Atmosphere

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Abstract

<p>The recycling process of the coarse machined chips from the commercial Ti-6%Al-4%V (Ti-64) alloy products to fine powders available for powder metallurgy (PM) components was established. The brittle TiH2 compounds formation in Ti chips via heat treatment in hydrogen gas atmosphere significantly improved their milling ability. TG-TDA and XRD analysis suggested the hydration and dehydration behavior of pure Ti and TiH2 powders. The suitable hydration temperature over 873 K in H2-Ar mixed gas successfully caused TiH2 compounds synthesis in Ti-64 chips, and resulted in reproduction of fine Ti-64 powders with a median particle size of 120 µm from the machined spiral chips by mechanical milling process. The green compact of reproduced Ti-64 powder after vacuum sintering at 1273 K showed a relative density of about 93%, larger than that of the sintered material in using the commercial Ti-64 powder. The hydrogen and oxygen contents of the sintered specimen using reproduced Ti-64 powder were satisfied with JIS-60. Accordingly, the machined Ti alloy chips were directly recycled as valuable starting materials to reproduce PM components via combination of hydration-milling-dehydration process.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Jpn. Soc. Powder Powder Metallurgy 64 (2017) 81–87.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 58 (12), 1702-1707, 2017

    The Japan Institute of Metals and Materials

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