文章信息/Info

Title:

Study on Preparation and Brazing Performance of AgCuGaInSn Brazing Filler

文章編號:

1674-3962(2022)08-0601-06

作者:

雷睿超1; 2; 操齊高1; 王瑞紅2

（1.西北有色金屬研究院，陜西 西安 710016）（2.西安理工大學材料科學與工程學院，陜西 西安 710048）

Author(s):

LEI Ruichao1; 2;  CAO Qigao1;  WANG Ruihong2

(1.Northwest Institute for Nonferrous Metal Research, Xi�餫n 710016, China) (2.College of Material Science & Engineering, Xi�餫n University of Technology, Xi�餫n 710048, China)

關鍵詞:

CuAgZr合金; Ag基釬料; 中溫釬料; 釬焊; 剪切性能; 換熱器

Keywords:

CuAgZr alloy;  Ag based brazing filler;  intermediate temperature filler;  brazing;  shear strength;  heat exchange

分類號:

TG454

DOI:

10.7502/j.issn.1674-3962.202107020

文獻標志碼:

A

摘要:

近幾年隨著制造行業的發展，換熱器制造所用材料也在更新換代，這促使了新型Ag基釬料的開發。Cu3Ag0.5Zr合金具有高導熱和高強度特性，被用來制作新型高性能換熱器,但過高的釬焊溫度會降低合金強度。Ga，In和Sn等元素可以顯著地降低Ag基釬料的釬焊溫度，有效提高釬焊后Cu3Ag0.5Zr合金的強度。以AgCu28為基礎合金，通過加入Ga，In和Sn元素設計并制備了AgCuGaInSn系列帶材釬料，研究了Ga，In和Sn元素對釬料物相和熔化性能的影響。同時優選了Ag61.2Cu23.8Ga3In10.5Sn1.5釬料釬焊Cu3Ag0.5Zr合金，通過研究接頭組織和力學性能，評價了AgCuGaInSn釬料對Cu3Ag0.5Zr合金的釬焊性能。研究表明：當Ga，In，Sn總質量分數增大至15%時，釬料液相點降至700 ℃以下；當Ga，In，Sn總質量分數為15%，且Ga與In原子比為2∶7時，優選釬料Ag61.2Cu23.8Ga3In10.5Sn1.5液相點最低，為675 ℃。該釬料加工性能良好，經歷旋鍛、退火、冷軋后可制成厚度為0.05～0.2 mm帶材。Ag61.2Cu23.8Ga3In10.5Sn1.5釬料在675～735 ℃可以成功釬焊釬縫寬度為0.2 mm的CuAgZr合金的接頭，接頭組織呈現2種不同類型，分別為富Ag相+富Cu相以及富Ag相+富Cu相+AgCu共晶組織。675 ℃下釬焊，接頭剪切強度為275 MPa，剪切斷口呈現韌性斷裂特征。接頭組織表征和剪切性能檢測結果證明AgCuGaInSn釬料適用于Cu3Ag0.5Zr合金的釬焊。

Abstract:

In recent years, with the development of manufacturing industry, the raw materials used in heat exchange are also being updated. This has prompted the development of new Ag based brazing filler. Cu3Ag0.5Zr alloy has high thermal conductivity and strength, and is used to make new high performance heat exchangers. But too high brazing temperature will reduce the strength of the alloy. The elements such as Ga, In and Sn can significantly reduce the brazing temperature of Ag based filler metal and effectively improve the strength of Cu3Ag0.5Zr alloy after brazing. In this paper, AgCuGaInSn was designed and prepared by adding Ga, In and Sn elements to base alloy AgCu28. The effects of Ga, In and Sn elements on the phases and melting properties of the filler metal were studied. Afterwards, Ag61.2Cu23.8Ga3In10.5Sn1.5 was optimized for brazing Cu3Ag0.5Zr alloy, and the brazing performance of AgCuGaInSn filler to Cu3Ag0.5Zr alloy was evaluated by investigating microstructure and mechanical property of joints. The results show that when the total mass fraction of Ga,In,Sn increases to 15%, the liquidus points of fillers decrease to below 700 ℃. When the total mass fraction of Ga,In,Sn is 15% and the atomic ratio of Ga∶In is 2∶7, that is, the optimal filler Ag61.2Cu23.8Ga3In10.5Sn1.5 liquidus point is the lowest, 675 ℃. And this filler has good processability with which filler can form strips with 0.05～0.2 mm thickness after rotary forging, annealing, cold rolling. The joints of CuAgZr alloy with gap width of 0.2 mm can be brazed successfully by Ag61��2Cu23.8Ga3In10.5Sn1.5 filler at 675～735 ℃. The joints have two different varies of microstructures, which are Ag-rich phase+Cu�瞨ich phase and Ag-rich phase+Cu-rich phase+AgCu eutectic structure respectively. The shear strength is around 275 MPa in joints brazed at 675 ℃ with 0.2 mm gap width, and the fracture is ductile fracture. The microstructure characterization and shear properties tests of the joints show that the AgCuGaInSn brazing filler is suitable for the brazing of Cu3Ag0.5Zr alloy.