Grain refining in spark plasma sintering Al2O3 ceramics

Grain refining in spark plasma sintering Al2O3 ceramics
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放电等离子烧结Al2O3陶瓷的晶粒细化

DOI:
10.1016/j.jallcom.2014.10.113
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发表时间:
2015-02
影响因子:
6.2
通讯作者:
Linan An
Linan An
中科院分区:
材料科学2区
文献类型:
--
作者:
Jinling Liu;Yiguang Wang;Fuqian Yang;Kepi Chen;Linan An

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本文研究了放电等离子烧结Al_2O_3过程中起始粉末粒度和烧结温度对晶粒细化的影响。研究发现,只有起始颗粒尺寸大于一定尺寸时,才会发生细化作用。晶粒度随烧结温度的升高而增大。这种细化很可能是由热机械疲劳过程中位错的重新排列引起的。结果表明,通过优化粒度和烧结温度,可以从微米级粉末中合成出纳米氧化铝陶瓷。
The paper reports the effect of starting powder size and sintering temperature on the grain refining in spark plasma sintering Al2O3. It was found that the grain refining effect only occurred for the starting particles larger than a certain size. The grain size increased with increasing sintering temperature. The grain refining is likely caused by the rearrangement of dislocations through a thermo-mechanical fatigue process. It suggested that nanostructured alumina ceramics could be synthesized from micro-sized powders by optimizing the particle size and sintering temperature.
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