BRIGHT METALLIC TITANIUM PARTICLES, METHOD OF MANUFACTURING SAME, BRIGHT COLORING TITANIUM PARTICLES USING SAME, METHOD OF HEATING AND COLORING SAME, AND POWDER COMPOSED OF THESE TITANIUM PARTICLES

摘要

Bright titanium particles are manufactured which are suitable as a bright material or the like of a metallic film. Spheroidal metallic titanium particles are crushed in one direction in a rolling treatment to be made into particles which have a scale shape to be even at inside and outside flat surface portions thereof and smooth at a peripheral edge of the scale shape. Formed on surfaces of the metallic titanium particles having the scale shape is a film of titanium oxide having a thickness in the range of 25 to 200 nm. Upon formation of the film of titanium oxide, a film of titanium oxide is formed by heating of at most 400 °C to have a thickness of 25 nm or more, and then is heated above 400 °C so that it can be grown to a thickness required for coloring.