Reaction control of TiB2 formation from titanium metal and amorphous boron |
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| Authors: | Hideaki Itoh Tsuneaki Matsudaira Shigeharu Naka Hiroshi Hamamoto |
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| Affiliation: | (1) Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, 464 Nagoya, Japan;(2) Toyota Central Research and Development Laboratories, Inc., Nagakute-cho, 480-11 Aichi Pref., Japan |
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| Abstract: | TiB2 powder was synthesized by a controlled formation reaction from titanium metal and amorphous boron. Precursory TiB2 formed by the pretreatment of the mixed powder (mole ratio: B/Ti=2.0) at 600° C for 60 min in an argon stream. Hollow TiB2 powder with an average grain size of 15 m was obtained by subsequent heat treatment above 900° C for more than 60 min in an argon stream. The formation reaction of TiB2 powder was further controlled by pretreatment of the mixed powder at 600° C for 60 min in a hydrogen and argon stream and subsequent heat treatment at 1000° C for 360 min in an argon stream, when hollow-free TiB2 powder was formed by a milder formation reaction between amorphous boron and the reformed titanium metal with hydrogen diffused lattice. |
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