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Ag37.5Cu48.8Zn5.5Mn8.2钎焊Cu3Ag0.5Zr合金接头组织和性能研究
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作者单位:

1.西安理工大学;2.西北有色金属研究院

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中图分类号:

TG 454

基金项目:

国家重点研发计划(项目号2017YFB0305702)


Brazing of CuAgZr alloy Using Ag-Cu-Zn-Mn Braze Filler: Studies on Microstructure and Properties Aspects
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Affiliation:

1.Xi ''an University of Technology;2.Northwest Institute for Nonferrous Metal Research

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    摘要:

    制造氢氧催化燃烧换热器所用材料逐渐向高强高导铜合金过渡,而换热器翅片和隔板的钎焊关系到换热器的热效率、服役安全性和可靠性。本文就高强高导Cu3Ag0.5Zr合金翅片与隔板的钎焊展开研究。使用箔带Ag37.5Cu48.8Zn5.5Mn8.2作为钎料,对钎缝宽度为50-200 μm的Cu3Ag0.5Zr合金接头进行钎焊,钎焊温度为840℃-900℃,保温时间为5 min-20 min。通过水淬快速冷却的方法将保温阶段钎缝处固液界面形貌保留下来,利用扫描电镜和能谱仪对接头钎缝组织和剪切断口形貌进行研究,利用万能力学试验机对接头剪切性能进行测试。研究表明:钎缝组织的形成经历了母材向钎料区溶解、富Cu相等温凝固和降温凝固三个阶段,形成了三种钎缝组织。分别为:富Ag相呈网状分布于母材和钎料区富Cu相之间、钎料区AgCu共晶组织、共晶组织和富铜相组成钎料区组织,另外CuZr相分布于界面区和钎料区,钎料区中Mn固溶于富Ag相和富Cu相中,其中CuZr相和Mn元素和接头剪切强度有一定的相关性,钎缝组织中的CuZr相对削弱了接头剪切强度,Mn元素则强化了接头剪切性能。钎焊温度、保温时间和钎缝宽度通过影响钎缝处钎焊组织、CuZr相和钎料区Mn元素含量,影响接头剪切性能。当钎缝宽度为100 μm,在870℃保温5 min时,接头剪切强度达到最大,为308.29 MPa。

    Abstract:

    The materials used in the hydrogen/oxygen catalytic combustion heat exchanger are gradually developed to the high strength and high conductivity copper alloy, and the brazing of the fins and separators of the heat exchanger is important to the thermal efficiency, service safety and reliability of the heat exchanger.The brazing of Cu-3Ag-0.5Zr alloy fins and baffles is studied in this paper.A Cu-3Ag-0.5Zr alloy was brazed at 840 ℃-900 ℃ brazing temperature for 5 min-20 min using 37.5Ag-48.8Cu-5.5Zn-8.2Mn braze filler that hadbeen produced into differern thickness.Solid-liquid interface morphology of the brazing joint at the insulation stage quenched by water was studied,which pointed that brazing joint structure has experienced the dissolution of the base material into the brazing filler metal area, the isothermal solidification of the Cu-rich phase, and the cooling and solidificationthree stages.Structures of the joints and shear fracture of joints were studied by scanning electron microscope(SEM) and energy dispersive spectrometers(EDS),which proved three kind of microstructures exist in joints which included Ag-rich phase distributing in a network between the base metal and the Cu-rich phase, AgCu eutectic structure in joint gap, and the filler zone structure consisted of AgCu eutectic and copper-rich phase constitute.And integrating these kinds of microstructures with shear strength datas of joints showed that CuZr in the brazing joint structure relatively weakens the joint shear strength,meanwhile Mn element strengthens the joint shear performance.shear strength of joint was effected in the way that brazing temperature,holding time and filler thickness control CuZr forming and Mn concentration in filler area of joints.The maximum shear strength value,308.29 MPa, was got at 100μm filler thickness,840℃ brazing temperature and 5 min holding time condition.

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雷睿超,操齐高,郑晶,王瑞红,王国耀. Ag37.5Cu48.8Zn5.5Mn8.2钎焊Cu3Ag0.5Zr合金接头组织和性能研究[J].稀有金属材料与工程,2021,50(10):3720~3728.[Lei Rui Chao, Cao Qi Gao, Zheng Jing, Wang Rui Hong, Wang Guo Yao. Brazing of CuAgZr alloy Using Ag-Cu-Zn-Mn Braze Filler: Studies on Microstructure and Properties Aspects[J]. Rare Metal Materials and Engineering,2021,50(10):3720~3728.]
DOI:10.12442/j. issn.1002-185X.20200820

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  • 收稿日期:2020-10-23
  • 最后修改日期:2020-11-12
  • 录用日期:2020-12-14
  • 在线发布日期: 2021-10-28
  • 出版日期: 2021-10-25