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氧化镁基MgAl2O4 复相陶瓷的制备与性能

DOI: 10.14062/j.issn.0454-5648.2015.09.15

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Abstract:

研究了MgO-MgAl2O4复相陶瓷的组分变化及添加剂对烧结性能、力学性能以及热性能的影响。结果表明当Al2O3含量为20%时,MgO-MgAl2O4复相陶瓷与固体氧化物燃料电池阳极支撑材料NiO/YSZ的热膨胀系数一致;复合添加剂CaO/SiO2可提高材料的烧结性能、力学性能以及热性能,但其添加量对各性能的影响有所不同当CaO/SiO2含量为2%时,气孔率最低,抗弯强度最高;当CaO/SiO2含量为8%时,抗热震指数达到最高值;添加剂的含量对材料的热膨胀系数没有明显影响。选取Al2O3含量为20%、CaO/SiO2添加量为6%的复相陶瓷与NiO/YSZ粘接成实验组合构件,该组合件经600℃热震温差20次空冷循环,结合状态和强度无明显变化。

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