HOLLOW METAL FINE GRAIN, METAL GRAIN GROUP CONTAINING THE FINE GRAIN AND PRODUCTION THEREOF

摘要

PURPOSE: To obtain a hollow metal fine grain having an extremely large contact area per unit grain and a low sp.gr. ;CONSTITUTION: The diameter of a hollow metal fine grain 1 is controlled to 1μm to 2mm. When the diameter of the grain 1 is 1 to 20μm, 0.05μm≤D and D/R≤0.25, where D is the thickness of the metal layer forming the grain 1 and R is the diameter of the hollow part 3 of the grain 1. When the diameter of the grain is controlled to 20μm to 2mm, 0.05μm≤D≤5μm. An opening 4 is provided in at least a part of the metal layer. The metal grain group containing hollow metal fine grains 1 contains at least one of the grain 1. The grain 1 is produced by forming the metal layer 2 on a core consisting of an org. polymer and then removing the core.;COPYRIGHT: (C)1994,JPO&Japio