Sodium as densification aid in MgAl2O4 nanoceramics

Sodium as densification aid in MgAl2O4 nanoceramics
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钠作为 MgAl2O4 纳米陶瓷的致密化助剂

DOI:
10.1016/j.matlet.2022.132693
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发表时间:
2022
期刊:
影响因子:
3
通讯作者:
Castro, Ricardo H.R.
Castro, Ricardo H.R.
中科院分区:
材料科学3区
文献类型:
--
作者:
Costa, Isabella L.M.;Miagava, Joice;Castro, Ricardo H.R.

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由于Hall-Petch关系向下延伸至低于10 nm的晶粒尺寸,铝酸镁纳米铈显示出优异的上级硬度。然而,制造具有如此极小晶粒的纳米铈构成了重大挑战。这项工作提出了钠作为一种有效的掺杂剂,以减少加工要求,实现完全致密化抑制粗化。采用放电等离子烧结技术,在400 MPa、1000 °C条件下制备了完全致密、透明的掺钠MgAl 2 O 4陶瓷,其晶粒尺寸小于15 nm。Na掺杂的样品实现压痕断裂韧性(K1 C)高达5.23 MPa/m1/2,超过具有类似晶粒尺寸的未掺杂MgAl 2 O 4的特征值,3.57 MPa/m1/2。简要讨论了Na+作为烧结助剂的作用。
Magnesium aluminate nanoceramics show superior hardness due to an extension of the Hall-Petch relationship down to grain sizes below 10 nm. However, the manufacturing of nanoceramics with such exceedingly small grains constitutes a significant challenge. This work proposes sodium as an effective dopant to reduce the processing requirements to achieve full densification with inhibited coarsening. Using Spark Plasma Sintering, we produced fully dense transparent Na-doped MgAl2O4under 400 MPa at 1000 °C with grain sizes below 15 nm. Na-doped samples achieved indentation fracture toughness (K1C) as high as 5.23 MPa/m1/2, surpassing values characteristic of undoped MgAl2O4with a similar grain size, 3.57 MPa/m1/2. The role of Na+as a sintering aid is briefly discussed.
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