Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites
In order to make the embryonic form of intragranular structure, the Al2O3/GdAlO3 system was selected due to its excellent mechanical properties. Gd2O3 and Al(NO3)3·9H2O were used as the starting materials. A co-precipitation method was used for the preparation of fine ceramics and applied to synthes...
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doaj-e2e1194046144817809c32e9392e04ea2020-11-24T23:04:24ZengMDPI AGMaterials1996-19442018-10-011110187910.3390/ma11101879ma11101879Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic CompositesShuai Sun0Qiang Xu1Department of Materials, North China University of Technology, Beijing 100144, ChinaNational Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing Institute of Technology, Beijing 100081, ChinaIn order to make the embryonic form of intragranular structure, the Al2O3/GdAlO3 system was selected due to its excellent mechanical properties. Gd2O3 and Al(NO3)3·9H2O were used as the starting materials. A co-precipitation method was used for the preparation of fine ceramics and applied to synthesize the nano-powder of GdAlO3 firstly. Then, the nano-powder of GdAlO3 was mixed with the precipitates by the second co-precipitation method. After drying and calcination, the compound powder with eutectic composition (77 mol % Al3+—23 mol % Gd3+) was fast sintered by using the spark plasma sintering technique. The results revealed that the phases of the sintered samples were Al2O3 and GdAlO3. The phases showed a homogeneous and interlaced distribution. All the matrix grains were submicron. The sizes of the intragranular structures were between 50 nm and 150 nm. Therefore, the intragranular structure displayed a novel mixture of nanometer–submicron and submicron–submicron types. The different intragranular structures all changed the fracture modes of Al2O3 grains from intergranular fracture to transgranular fracture.http://www.mdpi.com/1996-1944/11/10/1879ceramic nanocompositespark plasma sinteringAl2O3GdAlO3intragranular structures |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shuai Sun Qiang Xu |
spellingShingle |
Shuai Sun Qiang Xu Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites Materials ceramic nanocomposite spark plasma sintering Al2O3 GdAlO3 intragranular structures |
author_facet |
Shuai Sun Qiang Xu |
author_sort |
Shuai Sun |
title |
Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites |
title_short |
Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites |
title_full |
Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites |
title_fullStr |
Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites |
title_full_unstemmed |
Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites |
title_sort |
fabricating a novel intragranular microstructure for al2o3/gdalo3 ceramic composites |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2018-10-01 |
description |
In order to make the embryonic form of intragranular structure, the Al2O3/GdAlO3 system was selected due to its excellent mechanical properties. Gd2O3 and Al(NO3)3·9H2O were used as the starting materials. A co-precipitation method was used for the preparation of fine ceramics and applied to synthesize the nano-powder of GdAlO3 firstly. Then, the nano-powder of GdAlO3 was mixed with the precipitates by the second co-precipitation method. After drying and calcination, the compound powder with eutectic composition (77 mol % Al3+—23 mol % Gd3+) was fast sintered by using the spark plasma sintering technique. The results revealed that the phases of the sintered samples were Al2O3 and GdAlO3. The phases showed a homogeneous and interlaced distribution. All the matrix grains were submicron. The sizes of the intragranular structures were between 50 nm and 150 nm. Therefore, the intragranular structure displayed a novel mixture of nanometer–submicron and submicron–submicron types. The different intragranular structures all changed the fracture modes of Al2O3 grains from intergranular fracture to transgranular fracture. |
topic |
ceramic nanocomposite spark plasma sintering Al2O3 GdAlO3 intragranular structures |
url |
http://www.mdpi.com/1996-1944/11/10/1879 |
work_keys_str_mv |
AT shuaisun fabricatinganovelintragranularmicrostructureforal2o3gdalo3ceramiccomposites AT qiangxu fabricatinganovelintragranularmicrostructureforal2o3gdalo3ceramiccomposites |
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1725630642465538048 |