文章信息/Info

Title:

Study on Preparation and Brazing Performance of AgCuGaInSn Brazing Filler

文章編號(hào):

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(xué)材料科學(xué)與工程學(xué)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(guān)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(hào):

TG454

DOI:

10.7502/j.issn.1674-3962.202107020

文獻(xiàn)標(biāo)志碼:

A

摘要:

近幾年隨著制造行業(yè)的發(fā)展，換熱器制造所用材料也在更新?lián)Q代，這促使了新型Ag基釬料的開發(fā)。Cu3Ag0.5Zr合金具有高導(dǎo)熱和高強(qiáng)度特性，被用來(lái)制作新型高性能換熱器,但過(guò)高的釬焊溫度會(huì)降低合金強(qiáng)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(qiáng)度。以AgCu28為基礎(chǔ)合金，通過(guò)加入Ga，In和Sn元素設(shè)計(jì)并制備了AgCuGaInSn系列帶材釬料，研究了Ga，In和Sn元素對(duì)釬料物相和熔化性能的影響。同時(shí)優(yōu)選了Ag61.2Cu23.8Ga3In10.5Sn1.5釬料釬焊Cu3Ag0.5Zr合金，通過(guò)研究接頭組織和力學(xué)性能，評(píng)價(jià)了AgCuGaInSn釬料對(duì)Cu3Ag0.5Zr合金的釬焊性能。研究表明：當(dāng)Ga，In，Sn總質(zhì)量分?jǐn)?shù)增大至15%時(shí)，釬料液相點(diǎn)降至700 ℃以下；當(dāng)Ga，In，Sn總質(zhì)量分?jǐn)?shù)為15%，且Ga與In原子比為2∶7時(shí)，優(yōu)選釬料Ag61.2Cu23.8Ga3In10.5Sn1.5液相點(diǎn)最低，為675 ℃。該釬料加工性能良好，經(jīng)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(xiàn)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(qiáng)度為275 MPa，剪切斷口呈現(xiàn)韌性斷裂特征。接頭組織表征和剪切性能檢測(cè)結(jié)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.