In situ formation of transparent spinel with the spark plasma sintering of magnesia-alumina nanocomposite granules without the help of sintering aid

被引：9
作者：
Heidari, Nasrin [1 ]
Davar, Fatemeh [1 ]
Alhaji, Amir [2 ]
机构：
[1] Isfahan Univ Technol, Dept Chem, Esfahan 8415683111, Iran
[2] Malek Ashtar Univ Technol, Dept Mat Engn, Tehran, Iran
来源：
CERAMICS INTERNATIONAL | 2022年 / 48卷 / 02期
基金：
美国国家科学基金会;
关键词：
spinel; Transparent; Reactive sintering; SPS; MGAL2O4; SPINEL; TEMPERATURE; NANOBELTS; CERAMICS; GROWTH;
D O I：
10.1016/j.ceramint.2021.09.242
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this project, magnesia-alumina composite granules were prepared via the spray drying method. Next, the synthesized powder was sintered at 1400 degrees C-1500 degrees C by the spark plasma sintering method under the pressure of 100 MPa without using any sintering aids. The effects of two sintering temperatures (1400 degrees C and 1500 degrees C) on the phase evolution, density, fracture toughness, and light transmission of the samples in the visible and IR range were investigated. SEM results indicated that the magnesia-alumina composite granules had spherical morphology with a mean particle size of 7-8 mu m. The XRD pattern showed that after spark plasma sintering at 1400 degrees C and 1500 degrees C, magnesium aluminate phase spinel was obtained from the penetration and reaction of alumina and magnesia nanoparticles. The disc sintered at 1400 degrees C had more transparency than the sample sintered at 1500 degrees C within the UV-Vis and middle IR region because of the lower porosity of the sample. The magnesium aluminate spinel sintered at 1400 degrees C had a density of 99.98% theoretical density, hardness of 18 GPa, and fracture toughness of 1.6 MPam(1/)(2).
引用
收藏
页码：1633 / 1641
页数：9
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