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| 添加微量硅对925银合金抗硫化变色性能的影响 |
| Effect of Trace Silicon Addition on the Vulcanization Tarnish Behavior of 925 Silver Alloys |
| Received:March 11, 2020 |
| DOI： |
| 中文关键词: 金属材料 925银 硅 微观组织 抗硫化变色 |
| 英文关键词: metal materials 925 silver silicon microstructure vulcanization tarnish behavior |
| 基金项目:河南省重大创新示范专项(201110210600) |
| Author Name | Affiliation | E-mail | | YU Qi* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | yuqi686@163.com | | MA Jia* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | | | ZHONG Su-juan* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | | | PAN Jian-jun* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | | | YU Xin-quan* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | | | LONG Wei-min* | State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China | |
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| 中文摘要: |
| 微量硅在925银铸造过程中可促进合金脱氧，提高合金熔体的洁净度和流动性，但过量硅会劣化合金性能。采用光学显微镜和电子显微镜研究添加微量硅(0.09%~0.15%)对925银微观组织变化的影响。结果表明，随着硅含量升高，925银合金中一次枝晶组织粗大，二次枝晶臂间距增大，当二次枝晶臂间距大于10 μm，合金断裂趋势显著增加。硅元素在925银合金中形成黑色低熔铜基共晶相，并由1~10 μm的点状相转变为8~20 μm的断续条状相，显微硬度变化与共晶二次析出相比例呈对应关系。在925银中梯度添加微量硅使合金硫化腐蚀后色差缩小，提高合金的抗硫化腐蚀变色能力。 |
| 英文摘要: |
| Trace silicon can promote the deoxidation of alloys and improve the purity and fluidity of the alloy melt during 925 silver casting, but excessive silicon will degrade the performance of the alloys. The effects of adding trace silicon (0.09%~0.15%) on the microstructure of 925 silver alloys were studied by optical microscope and electron microscope. The results showed that with the increase of silicon content, the primary dendrite structure become coarser and the secondary dendrite arm spacing of 925 silver alloy increased. The fracture tendency of the alloys increased significantly, when the secondary dendrite arm spacing was greater than 10 μm. In 925 silver alloys, silicon formed black low-fused copper-based eutectic phase, and changed from 1~10 μm of dotted phases to 8~20 μm of a discontinue stripe phase. There is a corresponding relationship between the microhardness change and the secondary precipitation phase ratio of eutectic. The gradient addition of trace silicon in 925 silver reduced the chromatism after vulcanization and improved the chromatism resistance of the alloys. |
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