Aluminum alloy powders for coating materials, and coating materials containing the alloy powders

摘要

An aluminum alloy powder for coating materials, comprising an amorphous aluminum alloy consisting essentially of from 83 to 91 % of Al, from 0.5 to 5 % of Ca and from 8 to 12 % of Ni, all in atom %, and comprising a leaf-shaped particle having a thickness of 0.3 to 3 mu m, a minor axis of from 10 to 150 mu m, a ratio of the minor axis to a major axis of from 1 to 2, and an aspect ratio which is the ratio of the minor axis to the thickness of from 3 to 100. A coating material containing this aluminum alloy powder is also disclosed. The aluminum alloy powder has a superior dispersibility to a resin in a coating material, and when added to the coating material and then coated, can bring about the leafing phenomenon in a good state, so that the coating surface can be effectively covered with the powder. The powder can impart better hiding power and reflecting properties even when added in a smaller quantity than conventional powders. Since the powder is comprised of an amorphous alloy, it causes no deterioration of reflecting properties even when used in water-soluble solvent coating materials.