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One-step synthesis of in-situ carbon-containing calcium aluminate cement as binders for refractory castables
- Source :
- Ceramics International. 44:15378-15384
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- In-situ carbon-containing calcium aluminate cement (CCAC) was synthesized through carbon-bed sintering with calcium citrate tetrahydrate and Al2O3 as raw materials. The synthesized product was characterized by X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and infrared carbon–sulfur analysis. The results show that after sintering at 1500 °C for 4 h, the phase compositions of the product approached that of the commercial cement Secar71. The in-situ carbons in the product had partially graphitized domains and porous structures, were uniformly embedded in calcium aluminate, and the carbon content of the product was 1.45%. The floating ratios and oxidation ratios of the CCAC were lower than those of carbon back/Secar71 (S71CB) composite powders, implying that the water dispersion and oxidation resistance of CCAC were improved. Furthermore, the cold crushing strength (CCS), and cold modulus of rupture (CMOR) of the corundum-based castables bonded with CCAC, and S71CB, respectively, were compared. The CCS and CMOR values of the castables bonded with CCAC after being fired at 1100 °C for 3 h are higher by 20% and 21%, respectively, than those of the castables bonded with S71CB, suggesting that CCAC can be applied as a promising binder for the refractory castables.
- Subjects :
- Materials science
Scanning electron microscope
Aluminate
Composite number
chemistry.chemical_element
Sintering
Corundum
02 engineering and technology
engineering.material
01 natural sciences
chemistry.chemical_compound
0103 physical sciences
Materials Chemistry
010302 applied physics
Cement
Tetrahydrate
Process Chemistry and Technology
021001 nanoscience & nanotechnology
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
Chemical engineering
Ceramics and Composites
engineering
0210 nano-technology
Carbon
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........770eb054b2f7abbde5a1928eb1f4a8f1