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Diffusion bonding was performed on STS316L plate with micro channels to understand the relationship between bonding conditions and mechanical properties of the joints. Various defects such as spot and line defects developed along the joints bonded at various bonding conditions. As the bonding temperature increased, these defects had a tendency to decrease. With experimental results, it was revealed that bonding temperature was the most critical for formation of defects along the joints. Additionally, the sound joint showed coalescence of grains along the joint by migration of the grain boundaries. Tensile test result showed that the sound joint had better mechanical properties than STS316L base metal, and that crack initiated at spot and line defects followed by fracture. Based on experimental results, PCHE was manufactured and it passed hydraulic test under 1200 bar.

Development of Printed Circuit Heat Exchanger for Hydrogen Station using Diffusion Bonding