自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第47卷    第1期    总第257期    2016年1月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2016)01-0033-08
Zn对Sn-Pb-Ag合金中Ag富集规律的影响
白平平1, 2,刘大春1, 2,蒋文龙1, 2,李一夫1, 2,徐光耀3,胡亮1, 2

(1. 昆明理工大学 真空冶金国家工程实验室,云南 昆明,650093;
2. 云南省有色金属真空冶金重点实验室,云南 昆明,650093;
3. 广西冶金研究院,广西 南宁,530023
)

摘 要: 以Sn-36.6%Pb-1%Ag为研究对象,采用扫描电子显微镜(SEM)、X线能谱仪(EDS)和化学成分分析等手段,对Sn-Pb-Ag中加入Zn后Ag与Sn,Zn反应的热力学、浮渣含银量及Ag-Zn化合物的组成、形貌及分布进行研究。研究结果表明:Ag更易与Zn生成Ag-Zn金属间化合物;浮渣含银低于1%(质量分数);体系上部、中部和底部均存在3种金相:富锡相(Sn-12.21%Pb-0.52%Ag-2.42%Zn)、富铅相(Pb-31.34%Sn-1.89%Zn)和Ag-Zn化合物相(Zn-27.30%Ag-10.87%Sn-3.70%Pb),Ag-Zn化合物相不发生偏析,且体系中不存在分层区域。原因可能是Sn-36.6%Pb-1%Ag的密度仅比Ag-Zn化合物密度大0.35 g/cm3;Sn-36.6%Pb-1%Ag为富锡基体系,富锡基中不存在双液相分层区。但是在Sn-Pb-Ag体系中加入Pb,不仅能增大体系的密度,当铅的质量分数大于60%时液相将存在双液相分层区,使得加锌富集Sn-Pb-Ag中的银成为可能。

 

关键词: Sn-Pb-Ag;Ag-Zn化合物;密度;液相分层;铅

Effect of Zn addition on enrichment of silver in Sn-Pb-Ag alloy
BAI Pingping1, 2, LIU Dachun1, 2, JIANG Wenlong1, 2, LI Yifu1, 2, XU Guangyao3, HU Liang1, 2

1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
2. Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming 650093, China;
3. Guangxi Metallurgical Research Institute, Nanning 530023, China

Abstract:The reaction thermodynamic of Ag and Sn or Zn, the mass fraction of Ag in the dross, and the composition, microstructure and distribution of Ag-Zn intermetallic compound (IMC) were studied by using scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and chemical composition analysis when Zn was added into the Sn-36.6%Pb-1%Ag (mass fraction) system. The results show that the formation of Ag-Zn IMC is easier than that of Ag-Sn IMC. The content of Ag in the dross is less than 1%. There are three phase regions, which are rich Sn region (Sn-12.21%Pb-0.52%Ag-2.42%Zn), rich Pb region (Pb-31.34%Sn-1.89%Zn) and Ag-Zn IMC region (Zn-27.30%Ag- 10.87%Sn-3.7%Pb). The three phase regions are distributed in the top, middle and bottom of the system, and they are not layered. No segregation of Ag-Zn IMC region can be seen in the system. The reasons for these phenomena can be attributed to the fact that the density of Sn-36.6%Pb-1%Ag is only 0.35 g/cm3 larger than that of Ag-Zn IMC, and that Sn-36.6%Pb-1%Ag is rich tin-based system in which dual-phase stratified region could not exist. Nevertheless, when the Pb was added into the Sn-Pb-Ag system, the density of system increased, and dual-phase stratified region occurred in liquid phase when the mass fraction of Pb was more than 60%, which made it possible to enrich Ag by adding Zn into the Sn-Pb-Ag alloy.

 

Key words: Sn-Pb-Ag; Ag-Zn intermetallic compounds; density; stratified region; lead

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号