微通道反应器中Fe-Cr-Al芯片层叠扩散焊接工艺  

Study about diffusion welding of Fe-Cr-Al stacked chips made of micro-channel reactor

作　　者：姜威[1] 吕涛[2] 常保华[1] 都东[1] 薛龙[2] 

机构地区：[1]清华大学先进成形制造教育部重点实验室,北京100084 [2]北京石油化工学院光机电装备技术北京重点实验室,北京102617

出　　处：《焊接学报》2011年第3期69-72,116,共4页Transactions of The China Welding Institution

基　　金：国家863高技术研究发展计划资助项目(2009AA04Z208);北京市重点实验室开放基金(KF2007-07)

摘　　要：通过对甲醇重整制氢反应器中铁铬铝合金的一系列扩散焊接试验,利用金相观察和力学性能测试得到的结果,发现压力保持不变时(10,20 MPa),温度从800～1 100℃变化时,母材与中间层的界面变得模糊直至消失,反映了扩散反应依次增强的变化规律.温度从800℃开始上升后,接头的抗剪强度从7.9 MPa迅速增加到32.4MPa(均值),但当温度升高到一定程度后(>900℃),其增长趋势变缓,且随着温度的升高,试样的强度波动逐渐减小.温度达到1 100℃时母材在拉伸时将沿应力集中最大的区域断裂.同时材料的抗拉强度也随着温度的升高而减小.另外,综合考虑变形率及气密性可以发现1 100℃,1.5 MPa,保温1 h是焊接铁铬铝合金组成的微通道反应器最为适宜的工艺参数.A series of diffusion bonding experiments using Fe-Cr-Al alloy made of the methanol into hydrogen reactor,and in accordance with metallographic and mechanical test,it can find that keep the pressure constant(10,20 MPa),and temperature changes from 800 ℃ to 1 100 ℃,the interface between the base metal and the middle layer blurred to disappear,reflecting the reaction enhances.When temperature rises from 800 ℃,the shear strength of joint increases from 7.9 MPa to 32.4 MPa quickly(average),however,when temperature rises to a certain degree(>900 ℃),its growth trend slows,and fluctuations of intensity decreases.When temperature is higher than 1 100 ℃,the grain grows and intensity increased.When the temperature reaches 1 100 ℃,the base material will fracture along the largest stress concentration in tensile testing.At the same time,the tensile strength will decrease when temperature increases.In addition,considering deformation and air tightness,1 100 ℃,1.5 MPa and keeping temperature for 1 h is the most appropriate process parameters to weld the Fe-Cr-Al made of micro-channel reactor.

关 键 词：微通道反应器 铁铬铝 扩散焊接 

分 类 号：TG115.28[金属学及工艺—物理冶金]