| 摘要 |
The spheres are made from tin amalgam with a mercury content in the range 30-70%. They are coated with a metal- or alloy powder, which forms an amalgam with mercury. The powder particle diameter is less than 100 mu m. The powder is tin, zinc or an alloy of tin or zinc. The spheres are coated with 10 wt% of the powder, based on their weight. In addition they are coated with 0.001 - 1 wt% of powdered metal oxide. The powder is tin or a tin alloy. It is alternatively an alloy of tin, silver and copper. The diameter of the spheres is 50-2000 mu m. To make them, the amalgam is completely melted and dripped into coolant, e.g. a silicon oil, at a temperature below the setting temperature of the amalgam. The spheres are then separated-out. The coolant is a mineral-, organic- or synthetic oil. Residual oil is removed from the spheres by de-greasing. At room temperature, under constant circulation, the spheres are coated with the powder, until they no longer stick together. In a further stage, they are similarly-coated with the metal oxide powder. An independent claim is included for the method of manufacturing the amalgam spheres. |
