Production of flaky Cu-based amorphous powders by a two-stage quenching technique, and their chemical and optical properties

Abstract

Amorphous Cu 71Ni 11P 18 powders were produced by the two-stage quenching technique consisting of high pressure gas atomization and subsequent centrifugal spinning. These amorphous powders have a flaky morphology with a disk or ellipsoidal shape. They have small thicknesses of about 1–3 μm and large aspect ratios of about 10–350. The flaky powders produced by the two-stage quenching technique displayed excellent coating characteristics, which resulted from the unique powder morphology. The application of the Cu-based powders to colored and antifouling pigments is expected, exploiting the characteristics of Cu-based amorphous alloys.