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Boron mullite: Formation and basic characterization
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DOI：10.1016/j.materresbull.2012.08.064.png)
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A series of boron doped mullites (B-mullite) was prepared from single-phase gels with initial compositions based on a 1:1 isomorphous substitution of Si by B, starting from a 3:2 mullite composition (Al4.5Si1.5O9.75). A high amount of boron (>10 mol.%) can be incorporated into the crystal structure of mullite where it most likely replaces Si. In situ phase formation of B-mullites was studied with high temperature X-ray diffraction and thermal analysis. A decrease of the formation temperature for B-mullite with increasing boron content was observed. With increasing boron content lattice parameters and c significantly decrease, while no systematic evolution of a is observed. Long annealing at 1400 degrees C results in decomposition of B-mullite to boron free mullite and alpha-alumina. At 800 degrees C B-mullite appears to be stable over a period of at least 12 days. The mean thermal expansion coefficient was reduced by 15% upon incorporation of boron which makes the material technologically interesting. (C) 2012 Elsevier Ltd. All rights reserved.
Keyword:
Inorganic compounds
Ceramics
Chemical synthesis
X-ray diffraction
Thermal expansion
期刊
IF:
5.7
论文数:
1.3W
被引数:
2.9W
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