MgO源对纳米η-Al2O3制备镁铝尖晶石的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 1046-1051.

• 耐火材料 • 上一篇

MgO源对纳米η-Al₂O₃制备镁铝尖晶石的影响

郑培毓, 张玲, 张晓序, 李人骏

辽宁科技大学材料与冶金学院,鞍山 114051

收稿日期:2020-12-02 修回日期:2021-01-08 出版日期:2021-03-15 发布日期:2021-04-13
通讯作者: 张玲,博士,教授。E-mail:452433876@qq.com
作者简介:郑培毓(1997—),女,硕士研究生。主要从事耐火材料方面的研究。E-mail:964387021@qq.com
基金资助:
国家自然基金联合基金(U20A20239)

Effect of MgO Source on Preparation of Magnesium Aluminate Spinel by Nano-η-Al₂O₃

ZHENG Peiyu, ZHANG Ling, ZHANG Xiaoxu, LI Renjun

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China

Received:2020-12-02 Revised:2021-01-08 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

摘要： 分别以轻烧氧化镁粉、碳酸镁、分析纯氢氧化镁为MgO源,纳米η-Al₂O₃为原料(其摩尔比为1∶1),采用固相反应法制备镁铝尖晶石。研究不同MgO源对纳米η-Al₂O₃制备镁铝尖晶石的显气孔率、体积密度、物相组成、晶胞参数以及微观结构的影响。结果表明,随着烧结温度升高,三种MgO源与纳米η-Al₂O₃制得镁铝尖晶石试样的致密性逐渐升高。在1 600 ℃下,以氢氧化镁为MgO源与纳米η-Al₂O₃制得尖晶石试样的体积密度最大为3.296 g/cm³,显气孔率最低为1.9%,晶粒发育最好,晶粒尺寸约为3~5 μm。1 300 ℃时,三种MgO源与纳米η-Al₂O₃全部生成镁铝尖晶石,与以α-Al₂O₃为Al₂O₃源制备镁铝尖晶石的传统固相法相比,镁铝尖晶石的合成温度降低了100 ℃,可以降低镁铝尖晶石的成本,对镁铝尖晶石的应用具有实际意义。

关键词: 纳米η-Al₂O₃, 镁铝尖晶石, 烧结温度, 固相反应法

Abstract: Magnesium aluminate spinel was prepared by solid-state reaction method with light burned magnesia powder, MgCO₃ or analytically pure Mg(OH)₂ as MgO source and nano-η-Al₂O₃ with molar ratio of 1∶1. The effects of different MgO sources on the apparent porosity, bulk density, phase composition, unit cell parameters and microstructure of magnesium aluminate spinel prepared by nano-η-Al₂O₃ were studied. The results show that with the increase of sintering temperature, the compactness of the magnesium aluminate spinel samples prepared by three kinds of MgO sources and nano-η-Al₂O₃ becomes better and better. At 1 600 ℃, the maximum bulk density of spinel samples prepared by using Mg(OH)₂ as MgO source and nano-η-Al₂O₃ is 3.296 g/cm³, the lowest apparent porosity is 1.9%, and the grain size is about between 3 μm and 5 μm. At 1 300 ℃, all the three MgO sources and nano-η-Al₂O₃ form magnesium aluminate spinel. Compared with the traditional solid-phase method, for preparing magnesium aluminate spinel with α-Al₂O₃ as Al₂O₃ source, the synthesis temperature of magnesium aluminate spinel is reduced by 100 ℃. It reduces the cost of magnesium aluminate spinel, which has practical significance for the application of magnesia alumina spinel.

Key words: nano-η-Al₂O₃, magnesium aluminate spinel, sintering temperature, solid state reaction method

中图分类号:

TQ175

郑培毓, 张玲, 张晓序, 李人骏. MgO源对纳米η-Al₂O₃制备镁铝尖晶石的影响[J]. 硅酸盐通报, 2021, 40(3): 1046-1051.

ZHENG Peiyu, ZHANG Ling, ZHANG Xiaoxu, LI Renjun. Effect of MgO Source on Preparation of Magnesium Aluminate Spinel by Nano-η-Al₂O₃[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 1046-1051.

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MgO源对纳米η-Al₂O₃制备镁铝尖晶石的影响

Effect of MgO Source on Preparation of Magnesium Aluminate Spinel by Nano-η-Al₂O₃

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