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

出色的抗氧化性是中温固体氧化物燃料电池互连的一项关键要求。已经提出具有合适的热膨胀系数和良好的导电性的复合材料作为有前途的中温固体氧化物燃料电池互连件，但是仍然需要提高它们的抗氧化性。本文采用原位反应浸渗法制备了具有少量Ta元素的TiC / Hastelloy复合材料，其质量增益从1.18 mg cm ^-2降低至0.48 mg cm ^-2。（800°C / 100 h）加入少量的Ta，这在现有的复合互连中是最低的。在复合材料上形成了由Ni / Ti / Cr夹心结构的氧化皮组成的氧化皮。与不含Ta元素的TiC / Hastelloyy复合材料相比，Ta通过降低TiO ₂层中的氧空位浓度有效地防止了氧化过程中氧的向内扩散，并且内部氧化物层（O扩散层）消失了，从而优化了复合材料的抗氧化性。同时，具有Ta的复合材料表现出线性合适的热膨胀，为11.6×10 ^-6°C-1，并且具有高电导率，为5500 S cm ^-1。因此，添加微量Ta元素是优化TiC / Hastelloy复合材料抗氧化性能的一种有效方法。