レーザ合金化法による工業用純チタンの表面硬化処理 [in Japanese] Surface hardening of CP titanium by laser alloying process [in Japanese]
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In order to improve a surface hardness of commercially pure titanium, surface alloying with laser was carried out. Pure silicon, nickel, aluminum powder and a mixture of silicon and 9 mass%WSi<sub>2</sub> powder were used for surface alloying. These powders were spread on surfaces of titanium plates and reacted with titanium by CO<sub>2</sub> laser beam. Laser irradiation was carried out in argon atmosphere. As a result, when the silicon powder was used, a hard silicide layer (a principal ingredient was Ti<sub>5</sub>Si<sub>3</sub>) was formed over thickness 600 μm. In the case of the nickel powder, an alloying layer was consisted of TiNi and Ti<sub>2</sub>Ni, and its highest hardness was HV600. When the aluminum powder was used, needle-like shapes of precipitates of TiAl<sub>3</sub> were observed in aluminum-rich matrix phase. Moreover, in alloying with the powder mixture of silicon and WSi<sub>2</sub> powder, concentration phase of tungsten that had over HV1500 hardness were observed locally.
- J. Japan Inst. Light Metals
J. Japan Inst. Light Metals 49(1), 19-23, 1999-01-30
The Japan Institute of Light Metals