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

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.