On the Influence of Machining Process on Mechanical Properties of SOFC
工艺过程对固体氧化物燃料电池材料力学性能的影响

In the process of solid oxide fuel cells (SOFCs) production, different machining means may produce material damage. At the same time, material sintering process produces a relatively large residual stress. Above factors will affect battery life and integrity In this paper, the influence of different machining process on mechanical properties of material was experimentally studied, including: direct punching, laser cutting and grinding after laser cutting. The strength of tested specimens was also tested. Results show that the dispersibility of mechanical property caused by direct punching is large; the property after laser cutting is good; the influence of grinding after laser cutting is minimum. By the residual stress or effective stress in different layers, material strength of monolayer anode structure is higher than that of material with bilayer structure. Based on bending test, the residual stress in half-cell structure and the residual stress corresponding to different film thickness were tested. Tested results were compared with that of thermal elasticity theory. The computed residual stress is higher than experimental results due to the stress relaxation of anode material produced by high temperature.