Abstract
Single phase MgAl2O4 was made from a one-to-one molar ratio of MgO and Al2O3 powders mixed using ball-milling. Mixtures of MgO and Al2O3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500?C, the powder was converted to single phase MgAl2O4. The results show that mechanical activation improved the densification behavior of MgAl2O4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100?C. Based on dilatometer data, powders were subsequently densified at 1450?C by hot pressing. Almost ?ll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.
Highlights
Magnesium aluminate, MgAl2O4, the only compound in the MgO-Al2O3 binary system, is a refractory ceramic of great importance in modern technologies [1]
The goal of this study is to demonstrate the possibility of achieving fully dense pure MgAl2O4 spinel ceramics from as-received commercial powders by a process that combined mechanical activation and hot pressing
MgAl2O4 ceramics were prepared by solid state reaction between MgO and αAl2O3 powders during conventional sintering in a dilatometer and by hot pressing
Summary
MgAl2O4, the only compound in the MgO-Al2O3 binary system, is a refractory ceramic of great importance in modern technologies [1]. It possesses attractive physico-chemical properties, such as high melting point (> 2100 oC), high hardness and resistance to chemical attack, making it useful in high-temperature applications [2]. Pure MgAl2O4 can be transparent [4]. Owing to high mechanical strength and low cost, spinel ceramics have been used as transparent armor, infrared windows, domes for missiles and laser host materials [1, 5]. MgAl2O4 compound can be synthesized through various techniques, such as direct solid-state reaction, ultrasonic treatment, gel casting, wet chemical solution techniques, co-precipitation, and mechano-chemical reaction [6,7,8,9,10,11,12,13,14,15]
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