Sintering and Grain Growth Behaviour of Magnesium Aluminate Spinel: Effect of Lithium Hydroxide Addition
Sintering and Grain Growth Behaviour of Magnesium Aluminate Spinel: Effect of Lithium Hydroxide Addition
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镁铝尖晶石的烧结和晶粒生长行为：添加氢氧化锂的影响
DOI：
10.1016/j.jeurceramsoc.2021.05.003
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发表时间：
2021
影响因子：
5.7
通讯作者：
D. Galusek
中科院分区：
文献类型：
--
作者：
A. Talimian;H. El;M. Michalková;D. Galusek
氢氧化锂，LiOH，其量为0.1 - 1.2重量%，已被用作烧结助剂以改善MgAl 2 O 4的致密化。添加0.3重量%的LiOH促进致密化并限制晶粒生长。采用主烧结曲线法计算的烧结活化能随LiOH含量的增加从790 ± 20 kJ.mol− 1降低到510 ± 20 kJ.mol− 1。此外，还将MgAl 2 O 4与10重量%的LiOH混合以放大反应产物的形成。高温XRD结果表明，在1040 °C以上产生第二相（MgO和LiAlO 2）。当T > 1200 °C时，第二相开始消失，生成MgAl_2O_4。当添加少量LiOH时，高达约10%。0.3 wt%有利于致密化和抑制晶粒长大，存在一个临界Li+浓度，该浓度是由于Li+优先进入MgAl 2 O 4晶格所致。
Lithium hydroxide, LiOH, in the amounts ranging from 0.1 to 1.2 wt% has been used as a sintering aid to improve the densification of MgAl2O4. The addition of 0.3 wt% LiOH promotes densification and limits grain growth. The activation energy of sintering, calculated using master sintering curve approach, decreases from 790 ± 20 kJ.mol−1to 510 ± 20 kJ.mol−1with the addition of 0.3 wt% of LiOH. In addition, MgAl2O4was also mixed with 10 wt% of LiOH to amplify the formation of reaction products. High-temperature XRD results showed that secondary phases (MgO and LiAlO2) are produced above 1040 °C. The secondary phases start to disappear at T > 1200 °C, and MgAl2O4is produced. While adding small amounts of LiOH, up to ca. 0.3 wt%, is beneficial for densification and suppressing grain growth, there exists a critical concentration of Li+that is accounted for by the preferential incorporation of lithium ions into MgAl2O4crystal lattice.
DOI：
10.1111/j.1744-7402.2012.02828.x
发表时间：
2013-09-01
影响因子：
2.1
作者：
du Merac, Marc Rubat;Reimanis, Ivar E.;Mueller, Mathis M.
通讯作者：
Mueller, Mathis M.