固体氧化物燃料电池力学性能和形变行为研究

Mechanical Property and Deformation Behavior of SOFCs

通过流延成型、丝网印刷和共烧结法成功制备了阳极支撑的平板式固体氧化物燃料电池(SOFCs)。采用陶瓷样品同轴环施力方式和双扭法测试单电池的抗弯强度和断裂韧性分别为156.69 MPa与2.51 MPa?m1/2。当阳极支撑体由陶瓷(Ni O/YSZ)还原为金属陶瓷(Ni/YSZ),其抗弯强度和断裂韧性分别为104.48 MPa与3.95 MPa?m1/2。同时电池的弯曲变形测试表明:单电池经过阳极还原后弯曲变形程度变大,平整化压力从电池阳极还原前的108 N增加至184 N,而电池抵抗破裂能力增强。本研究显示,随着阳极支撑体还原后单电池的断裂韧性显著提高,将有效减缓其弯曲变形所引起的不利影响,改善单电池的综合力学性能。

Anode-supported planar solid oxide fuel cells （SOFCs） were successfully fabricated by tape casting, screen printing, and co-sintering technologies. Evaluated by the ring-on-ring and double-torsion technique, the flexure strength and fracture toughness of the single-cell are 156.69 MPa and 2.51 MPa＂ m1/2, respectively. And after the anode support being reduced from ceramic （NiO/YSZ） to cermet （Ni/YSZ）, the flexure strength and fracture toughness change to be 104.48 MPa and 3.95 MPa＇ml/z, respectively. Cell flexural deformation test indicates that with reduction of the anode support, the flexural deformation increases, the force for flattening cell increases （from 108 N to 184 N）, and the rupture-resisting performance is enhanced. In conclusion, with notable improvement of cell fracture toughness after anode support reduction, the adverse influence caused by flexural deformation can be effectively mitigated and the comprehensive mechanical property can be improved.