Oxidation resistance optimization of TiC/hastelloy composites by adding Ta element applied for intermediate temperature solid oxide fuel cell interconnects

摘要: Abstract Excellent oxidation resistance is one crucial requirement for intermediate-temperature solid oxide fuel cell interconnects. Composites with proper coefficient of thermal expansion and good electrical conductivity have been proposed as promising interconnects, whereas the them still need to be improved. In paper, TiC/hastelloy composites minor Ta element are prepared by in-situ reactive infiltration method, mass gain decreases from 1.18 mg cm−2 0.48 mg cm−2 (800 °C/100 h) adding Ta, which lowest among existing composite The scale composed Ni/Ti/Cr oxides sandwich structure formed on composites. Compared without element, effectively prevents inward diffusion oxygen during reducing vacancy concentration in TiO2 layer, inner layer (O layer) vanishes, leading optimization Meanwhile, show linear suitable expansion, 11.6 × 10−6 °C−1, high conductivity, 5500 S cm−1. Therefore, addition effective method optimize