「活性プラズマ―金属」反応法によるNi-TiC系複合超微粒子の合成

概要

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The composite ultrafine particle (UFP) of Ni and TiC was synthesized by arc melting, vaporization and deposition of Ni-Ti-C alloys in an atmosphere of hydrogen-argon mixed gas ("reactive plasma-metal" reaction) at 0.1MPa pressure. The crystal structure, the chemical composition, the morphology and sintering characteristics of obtained UFP were determined by X-ray diffractometry, energy dispersion analysis for X-ray, transmission electron microscopy and dilatometry, respectively.<BR>The UFP obtained from Ni-Ti-C parent alloys containing 60-90 mol%TiC was composed of three phases of Ni, TiC (NaCl type) and Ni<SUB>3</SUB>Ti. The TiC concentration of the UFP remarkably deviated negatively from TiC concentration of the parent alloys. The composite UFP consisting of Ni and TiC, whose morphology was dumbbell-like, dice-like or ball-like particles, was found in the obtaind UFP. It is considered that those composite particles are formed during the solidification process of a molten Ni-Ti-C particle condensed in the gas-phase. Dilatometric measurements under hydrogen atmosphere show that the composite UFP has different sintering characteristics from mixed powders of Ni UFP and TiC UFP.
社団法人粉体粉末冶金協会の論文