| 摘要 |
PURPOSE:To improve a silver material for an ornament by dispersing uniformly and finely a specified amount of cadmium oxide and manganese oxide in silver so as to produce the silver material. CONSTITUTION:The composition of this silver material for an ornament consists of 85-99.5wt% silver and 0.5-15wt% cadmium oxide and manganese oxide. The silver material is produced by powder metallurgical processing and the oxides of cadmium and manganese dispersed uniformly and finely in silver are converted into a grain refiner by heat treatment such as annealing or brazing. An oxide film is not formed by the heat treatment. Since the hardness of the silver material can be increased, a lustrous ornament hard to scratch can be produced. The resulting ornament has no irregularity in color and causes no defective brazing.
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