Synthesis Of Ti50Ni50 Alloy Nanopowders Synthesized by Modified Levitational Gas Condensation Method

Abstract

The stoichiometric Ti50Ni50 alloy nanopowders were synthesized by levitational gas condensation (LGC) using micron powder feeding system and their particulate properties were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer- -Emmett-Teller (BET) method. The starting Ti and Ni micron powders ∼ 150μm were incorporated into the micron powder feeding system. The ingot type of Ti-Ni alloy was used as a seed material for levitation and evaporation reactions. The collected powders were finally passivated by oxidation. The x-ray diffraction experiments have shown that the synthesized powders were completely alloyed with 50Ti and 50Ni in at.% and comprised of two different cubic and monoclinic crystalline phases. The TEM results showed that the produced powders were a very fine and uniform with the spherical particle size of 18 to 32 nm. The typical thickness of passivated oxide layer on the particle surface was about 2 to 3 nm. The specific surface area of the Ti-Ni alloy nanopowders was 54.8 m2/g based on a BET method.