The influence of mechanical activation and sintering process on the formation of the spinel phase of MgAl2O4

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Adriana Peleš Tadić, Jelena Živojinović, Vladimir Pavlović, Ana Stanković, Suzana Filipović, Nina Obradović, Frank Kern
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Abstract

Magnesium aluminate has the spinel structure and, due to good mechanical, chemical, and thermal properties, has a wide range of applications including refractory ceramics, optically transparent ceramic windows, and armors. Calcined MgO and Al2O3 powders were mixed in a one-to-one molar ratio to produce phase-pure spinel. The MgO powder was calcined at 1000 oC for 1 h prior to mechanical activation to avoid presence of hydroxide and carbonate at the powder surface. The powders were mechanically activated for 15, 30, and 60 min in a high-energy planetary ball mill in air atmosphere. The mechanically activated powders were pressed into pellets and heated to 1300 oC at 10 oC/min and held for 1 h for the reaction. Afterwards pellets were ground and sieved. Synthesized powders were sintered at 1450 oC at 10 oC/min for 2 h and examined for phase composition, crystal structure, and morphology. The results showed that mechanical activation and sintering led to formation of pure spinel phase. Mechanical activation times of 30 min and 60 min led to spinel that was more highly crystalline and phase-pure. Raman spectroscopy showed the presence of all five Raman active modes (A1g + Eg +3T2g), and their positions were in a good agreement with previous investigations. Powder morphology analysis showed that particles were comminuted, but that agglomerates formed for longer activation times. The maximum in the particle size distribution curves decreased from 14.7 μm for non-activated powder to 9.1 μm after 15 min of mechanical activation and 8.1 μm after 30 min of mechanical activation, but increased to10.5 μm after 60 min of activation.

Abstract Image

机械活化和烧结工艺对MgAl2O4尖晶石相形成的影响
铝酸镁具有尖晶石结构,由于其良好的机械、化学和热性能,在耐火陶瓷、光学透明陶瓷窗和装甲等领域有着广泛的应用。煅烧后的MgO和Al2O3粉末以1:1的摩尔比混合,得到相纯尖晶石。在机械活化之前,将MgO粉末在1000℃下煅烧1 h,以避免粉末表面存在氢氧化物和碳酸盐。将粉末在高能行星球磨机中机械活化15、30和60分钟。将机械活化的粉末压成颗粒,以10℃/min的速度加热到1300℃,保持1 h进行反应。然后将颗粒磨碎并过筛。将合成的粉末在1450℃、10℃/min下烧结2 h,观察其相组成、晶体结构和形貌。结果表明:机械活化和烧结形成了纯尖晶石相。机械活化时间为30min和60min时,尖晶石的结晶度和相纯度更高。拉曼光谱显示了5种拉曼活性模式(A1g + Eg +3T2g)的存在,它们的位置与前人的研究结果一致。粉末形貌分析表明,颗粒被粉碎,但在较长的活化时间内形成团块。机械活化15 min后,未活化粉末的粒径分布曲线最大值为14.7 μm,机械活化30 min后最大值为8.1 μm,机械活化60 min后最大值为10.5 μm。
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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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