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Homogeneously bulk porous calcium hexaaluminate (CaAl12O19): Reactive sintering and microstructure development
- Source :
- Ceramics International. 44:4462-4466
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Porous CaAl12O19 ceramics attract much attention toward many potential applications, such as high-temperature filters, catalyst supports, and lightweight structural materials at high temperatures. In this study, we have focused on the reactive sintering and microstructure development of homogeneously bulk porous CaAl12O19. Boehmite AlOOH powders with different particle size [0.08 µm (C01) and 0.7 µm (C06)] were used as Al2O3 sources. CaCO3 and boehmite powders were wet-ball milled, and the green compacts were sintered in air at 520 °C, 750 °C, 1100 °C, 1200 °C, 1300 °C, 1400 °C, 1500 °C (3 h) and 1600 °C (3 h), in order to analyze the microstructure development. At 1500 °C (3 h), microstructure became macroscopically homogeneous. The porosities of the C01 and C06 samples sintered at 1500 °C were calculated to be 51% and 56%, respectively. Stacking of the plate-like grains and their card-house structures are observed. Such card-house structures stabilize the open-porous structure even at 1600 °C. Just by changing the size of starting boehmite AlOOH powders, the size of the CaAl12O19 plate-like particles was altered with keeping similar porosity.
- Subjects :
- Boehmite
Structural material
Materials science
Process Chemistry and Technology
Mineralogy
Sintering
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Catalysis
Chemical engineering
visual_art
Materials Chemistry
Ceramics and Composites
visual_art.visual_art_medium
Ceramic
Particle size
0210 nano-technology
Porosity
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........4acfa54f611e6e28fc1e5d9db31cfb59