Laser Production of Metallic Ultra-Fine Particles(Welding Physics, Process & Instrument)

概要

論文の詳細を見る
Laser production of various ultra-fine metal and alloy particles was undertaken by repeating pulsed Nd: YAG laser shots on target materials such as commercially pure metals and binary alloys in Argon (Ar) or Helium (He) atmosphere. Especially, the characteristics of morphology, crystal structure, size distribution and color of particles and the influence of ambient pressure on the particle size and distribution were investigated by transmission electron microscope (TEM), its diffraction method and X-ray diffractometer, and the compositions of alloy particles were analyzed by energy dispersive X-ray spectrometer (EDX) of scanning electron microscope (SEM) and compared with those of target alloys. As a result, ultra-fine metal and alloy particles of less than 40nm in mean size and less than 150nm in maximum size could be produced from their target materials by pulsed laser heating-evaporation in Ar or He atmosphere at 0.1MPa (1atm). The mean sizes of Fe, Ni and Ti particles became smaller to less than 5nm with a decrease in the ambient pressure to 0.1kPa, and consequently it was judged that the particle size and distribution could be easily controlled by regulating ambient pressure. The powder yield was larger for Fe, Ni and Ti than Cu and Al of greater laser reflectance and Mo of higher vaporization temperature as compared at the same laser irradiation conditions. Moreover, laser production of ultra-fine alloy powders was feasible, and their compositions and structures were roughly controllable by selecting the compositions of target alloys.
大阪大学の論文

Laser Production of Metallic Ultra-Fine Particles(Welding Physics, Process & Instrument)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク