Abstract TiN/Ni Composites with high electrical conductivity and suitable thermal expansion coefficient have become potential materials for intermediate temperature solid oxide fuel cells interconnects (IT-SOFCs). The interconnect study is very broad in the current form, which is crucially important to increase fuel- cells power efficiency. In order to study the effect of Y2O3 addition on the oxidation resistance of TiN/Ni composites, composites with low Y2O3 content are fabricated by spark plasma sintering. The results show that by adding minor Y2O3, the average size of TiN particles increases from 1.65 μm to 2.92 μm. In addition, adding Y2O3 to the composite can reduce the mass gain (800 °C/120 h oxidation) from 4.46 mg·cm−2 to 2.97 mg·cm−2, which is a result of that Y2O3 promoted the formation of relatively dense NiO and inhibits the formation of loose rutile TiO2. Compared with TiN/Ni composites without Y2O3, the thermal expansion coefficient of Y2O3-containing composites is reduced from 12.4 × 10−6 k−1 to 11.9 × 10−6 k−1, and the diffusion depth of O is brought down from 98 μm to 63 μm. Meanwhile, composites with Y2O3 exhibits excellent electrical conductivity (1.34 × 104 S·cm−1), and high flexural strength (716 ± 14 MPa) after 800 °C/120 h oxidation. Therefore, Y2O3 can effectively change the composition and microstructure of the oxide scale and optimize the oxidation resistance of composites.

中文翻译：

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添加Y2O3对用于中温固体氧化物燃料电池互连的TiN/Ni复合材料抗氧化性的影响

摘要 TiN/Ni 复合材料具有高导电性和合适的热膨胀系数，已成为中温固体氧化物燃料电池互连（IT-SOFCs）的潜在材料。当前形式的互连研究非常广泛，这对于提高燃料电池的功率效率至关重要。为了研究 Y2O3 添加对 TiN/Ni 复合材料抗氧化性的影响，采用放电等离子烧结法制备了低 Y2O3 含量的复合材料。结果表明，通过添加少量 Y2O3，TiN 颗粒的平均尺寸从 1.65 μm 增加到 2.92 μm。此外，在复合材料中加入 Y2O3 可以将质量增加（800 °C/120 h 氧化）从 4.46 mg·cm-2 降低到 2.97 mg·cm-2，这是因为 Y2O3 促进了相对致密的 NiO 的形成并抑制了松散的金红石 TiO2 的形成。与不含 Y2O3 的 TiN/Ni 复合材料相比，含 Y2O3 的复合材料的热膨胀系数从 12.4 × 10-6 k-1 降低到 11.9 × 10-6 k-1，O 的扩散深度从 98微米到 63 微米。同时，含 Y2O3 的复合材料在 800 °C/120 h 氧化后表现出优异的导电性（1.34 × 104 S·cm-1）和高弯曲强度（716 ± 14 MPa）。因此，Y2O3可以有效地改变氧化皮的成分和微观结构，优化复合材料的抗氧化性。O的扩散深度从98μm降低到63μm。同时，含 Y2O3 的复合材料在 800 °C/120 h 氧化后表现出优异的导电性（1.34 × 104 S·cm-1）和高弯曲强度（716 ± 14 MPa）。因此，Y2O3可以有效地改变氧化皮的成分和微观结构，优化复合材料的抗氧化性。O的扩散深度从98μm降低到63μm。同时，含 Y2O3 的复合材料在 800 °C/120 h 氧化后表现出优异的导电性（1.34 × 104 S·cm-1）和高弯曲强度（716 ± 14 MPa）。因此，Y2O3可以有效地改变氧化皮的成分和微观结构，优化复合材料的抗氧化性。