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首页> 外文期刊>Journal of the European Ceramic Society >Field assisted sintering of ceramic constituted by alumina and yttria stabilized zirconia
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Field assisted sintering of ceramic constituted by alumina and yttria stabilized zirconia

机译:由氧化铝和氧化钇稳定的氧化锆构成的陶瓷的现场辅助烧结

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摘要

We show that a two-phase 50 vol% 3YSZ-alumina ceramic flash-sinters at afurnace temperature of 1060 ℃ under an electrical field of 150 Vcm~(-1). In contrast undoped, single-phase alumina remains immune to field assisted sintering at fields up to 1000 Vcm~(-1), although single-phase 3YSZ flash sinters at 750 ℃ (furnace temperature). The mechanisms of field assisted sintering are divided into two regimes. At low fields the sintering rate increases gradually (FAST), while at high fields sintering occurs abruptly (FLASH). Interestingly, alumina/zirconia composites show a hybrid behavior such that early sintering occurs in FAST mode, which is then followed by flash-sintering. The specimens held in the flashed state, after they had sintered to near full density, show much higher rate of grain growth than in conventional experiments. These results are in contrast to earlier work where the rate of grain growth had been shown to be slower under weak electrical fields.
机译:结果表明,在电场为150 Vcm〜(-1)的情况下,在1060℃的炉温下,两相体积分数为50 vol%的3YSZ-氧化铝陶瓷闪蒸烧结。相比之下,未掺杂的单相氧化铝在750℃(炉温)下仍能抵抗高达1000 Vcm〜(-1)的场助烧结。现场辅助烧结的机制分为两种状态。在低磁场下,烧结速率逐渐增加(FAST),而在高磁场下,烧结突然发生(FLASH)。有趣的是,氧化铝/氧化锆复合材料表现出混合行为,使得以FAST模式进行早期烧结,然后进行快速烧结。烧结至接近全密度后,保持在闪光状态的样品比常规实验显示出更高的晶粒生长速率。这些结果与早期的研究相反,早期的研究表明在弱电场下晶粒的生长速度较慢。

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