基于粉末叠层-共烧法设计并制备了α-Al2O3与Na-β-Al2O3相梯度变化的陶瓷基功能材料(FGM),用于钠电池中绝缘陶瓷α-Al2O3和Na-β-Al2O3之间的封接.所设计的相变化率分别为20wt％、10wt％和5wt％.研究结果表明:二维生长的Na-β-Al2O3晶粒对梯度复合陶瓷的致密度有一定的影响.对沿梯度变化方向不同位置FGM的成分分析表明,由于FGM中Na、Li成分的扩散,消除了梯度过渡层间的界面.20wt％、10wt％和5wt％梯度变化的FGM的抗折强度分别为:(130±2)、(180±3)和(225±2) MPa.经过长时间350℃保温以及多次热循环,梯度材料的机械性能没有明显退化,表现出良好的机械热稳定性和抗热震性.
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