压力容器2025，Vol.42Issue(7)：2-11,10.DOI:10.3969/j.issn.1001-4837.2025.07.001
Inconel 625高温钎焊板式换热器接头组织与性能
Microstructure and properties of high-temperature brazed joints in Inconel 625 plate heat exchangers
摘要
Abstract
To address the challenge of joint quality control in brazed plate heat exchangers for solid oxide fuel cell(SOFC)systems under severe service conditions,a process using BNi5b amorphous foil as filler metal for high-quality joining of Inconel 625 alloy is proposed.Under vacuum brazing conditions at 1 180℃with 45 min holding,prototype plate heat exchangers were fabricated using BNi5b amorphous foil and brazing paste respectively,with systematic comparison of seam formation and joint performance.Results show that the amorphous foil,due to its preform consistency and compositional uniformity,enables formation of brazed seams with uniform gaps and sufficient elemental interdiffusion,yielding significantly superior metallurgical quality compared to the paste method.Microstructural analysis further reveals that the foil joints exhibit uniformly distributed equiaxed grains in the isothermal solidification zone,finely dispersed brittle phases in the weld center,and higher proportions of low-angle grain boundaries and Σ3 twin boundaries,resulting in tensile strength of 318.86 MPa(33.6%higher than the 238.67 MPa of paste joints)and 7.62%improvement in bonding rate.This study provides effective process guidance and practical basis for reliable manufacturing of high-temperature plate heat exchangers for SOFC systems.关键词
固体氧化物燃料电池(SOFC)/板式换热器/钎焊/钎焊接头/Inconel 625/BNi5b钎料Key words
solid oxide fuel cells(SOFC)/plate heat exchanger/brazes/brazed joints/Inconel 625/BNi5b filler metal分类
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宋嘉梁,陈永东,彭小敏,乔瑞林,秦建,于改革,杨洋..Inconel 625高温钎焊板式换热器接头组织与性能[J].压力容器,2025,42(7):2-11,10.基金项目
国机集团青年科技基金项目(QNJJ-ZD-2024-23) （QNJJ-ZD-2024-23）
