Optimization of Bright Annealing Process of Pure Silver
Matte often occurrs in bright pure silver jewelry blank during the middle annealing,which increases the sub-sequent polishing workload.Taking sterling silver commonly used in jewelry industry as raw material,the annealing process of bright silver bars was analyzed in the atmosphere.The results indicate that with the extension of annealing time,the hardness is decreased rapidly at first and gradually tends to be stable.The chromatic aberration is constantly increased,presenting the pattern of"fast followed by slow".With the increase of heating temperature,the decreasing rate of hardness is raised,and the final hardness value is low,while the chromatic aberration is increased correspond-ingly.Therefore,a proper balance needs to be kept between hardness loss and color retention of bright pure silver annealed in the atmosphere.For bright silver bars for bangles with medium thickness,the annealing temperature is con-trolled at 400℃ for about 60 min,which can basically meet the needs of hardness reduction and brightness retention.
Pure SilverBright AnnealingHardnessChromatic Aberration
NETL
NSTL
万方数据
维普
