Development of mullite and spinel coatings on graphite for improved water-wettability and oxidation resistance
Source abstract
Abstract
Mullite and spinel forming sols were prepared from hybrid precursors having both organic and inorganic origins. Refractory grade graphite flakes were coated by these sols and their performances were compared in terms of oxidation resistance and water-wettability. Particle size distribution, structural evolution and related characteristics of both mullite and spinel gels have been investigated by dynamic light scattering (DLS), differential thermal analysis (DTA), X-ray diffraction (XRD) and infrared spectra (IR) studies. Coated graphites have also been studied by IR and XRD tests along with scanning electron microscopy (SEM) with energy dispersive spectral (EDS) analysis. The better performance of spinel coated graphite was confirmed. The mechanism of spinel formation on graphite was suggested to take place via intermediate gamma alumina phase formation from boehmite sol. It was clarified by DLS, XRD and microstructural analysis of dried and calcined gels.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Recycling and utilization of industrial and municipal waste in materials production · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Zhang · 2006 · vol. 45 · 2246
2. Improving the water-wettability and oxidation resistance of graphite using Al2O3/SiO2 sol–gel coatings10.1016/S0955-2219(02)00284-4 ↗
3. Hydration of aluminium powder in magnesium-containing water10.1111/j.1551-2916.2005.00208.x ↗
4. Reaction of aluminium powder with water in cement-containing refractory castables10.1016/j.jeurceramsoc.2004.07.004 ↗
5. Improvement in flowability, oxidation resistance and water wettability of graphite powders by TiO2 coating10.2109/jcersj.104.481 ↗
6. Development of MgAl2O4 spinel coating on graphite surface to improve its water-wettability and oxidation resistance10.1016/j.ceramint.2007.12.007 ↗
7. Improving the quality of nanocrystalline MgAl2O4 spinel coating on graphite by a prior oxidation treatment on the graphite surface10.1016/j.jeurceramsoc.2008.01.020 ↗
8. Synthesis and characterization of boehmitic alumina coated graphite by sol–gel method10.1016/j.ceramint.2008.11.006 ↗
9. High-temperature MgO–C–Al refractories–metal reactions in high-aluminum-content alloy steels10.1557/JMR.2003.0271 ↗
10. Easy-to-use mullite and spinel sols as bonding agents in a high alumina based ultra low cement castable10.1016/S0272-8842(02)00034-2 ↗
11. Microstructures of refractory castables prepared with sol–gel additives10.1016/S0272-8842(02)00216-X ↗
12. Spinel coated graphite for carbon containing refractory castables10.1111/j.1551-2916.2009.03133.x ↗
13. Protection of graphite and graphite-containing materials from oxidation10.1007/s11148-006-0021-1 ↗
14. Effect of mullite coating film on oxidation resistance of carbon materials with SiC-gradient10.1023/A:1006747305264 ↗
15. Alumina–silica composite coatings on graphite by CVD at 550°C10.1007/BF02774512 ↗
16. A modified pressure plate apparatus10.1520/GTJ11053 ↗
17. Synthesis and 980°C phase development of some mullite gels10.1111/j.1151-2916.1988.tb07568.x ↗
18. Structural parameters of mullite formed during heating of diphasic mullite gels10.1111/j.1551-2916.2005.00494.x ↗
19. Novel synthesis of high surface area MgAl2O4 spinel as catalyst support10.1016/j.matlet.2003.12.013 ↗
20. Hydrothermal synthesis of magnesium aluminate platelets10.1111/j.1551-2916.2006.01289.x ↗
21. Magnesium aluminate (MgAl2O4) spinel powders from water-based sols10.1111/j.1551-2916.2004.00019.x ↗
22. Synthesis of MgAl2O4 spinel: seeding effects of formation temperature10.1007/BF01184974 ↗
23. Arai · 1996
24. Carboxylate-substituted alumoxanes as processable precursors to transition metal–aluminum and lanthanide–aluminum mixed-metal oxides: atomic scale mixing via a new transmetalation reaction10.1021/cm960153e ↗
25. Critical factors in the production of sol–gel derived porous alumina10.4028/www.scientific.net/KEM.115.45 ↗
26. Structural evolution in alumina gel10.1007/BF01082141 ↗
27. Microstructural and sintering behaviour of magnesia doped, seeded, different boehmite derived alumina10.1016/S0272-8842(98)00067-4 ↗
28. Carbon coating and reaction on magnesia–alumina spinel10.1016/j.matchemphys.2005.04.060 ↗
29. Structural analysis on spinel (MgAl2O4) for application in spinel bonded castables
30. Mg–Al spinel: is it the mullite of 21st century?