| 摘要 |
1517937 Copper coating dental alloys PENNWALT CORP 21 Nov 1975 [13 Dec 1974] 48043/75 Headings C7A and C7F The compactability of 5-60 micron spherical particles of dental amalgam alloy is improved by treating with a solution containing 1-10g/l cupric chloride as CuCl 2 À2H 2 O and 5-30% volume concentrated HCl to form cului crystals containing Cu on the particles. The alloy contains in weight per cent 50-75 Ag, 20-30 Sn, 2-20 Cu and 0-2 Zn and the particles may be contacted with the solution either by immersion and agitation or by falling through a tower in concurrent or countercurrent flow with the solution. After a preferred contact time of 10-40 minutes the coated particles are water washed, dried and compacted into cylindrical tablets which can then be amalgamated with Hg. |
