Effect of Aluminium Sol on Microstructure and Properties of Corundum-Mullite Ceramic
The effect of aluminium sol on the properties and microstructure of corundum-mullite ceramics was investigated. The sample with 1.5 wt% aluminium sol possessed higher room-temperature and high-temperature strengths, while the sample with 3 wt% aluminium sol had higher bulk density, lower apparent porosity and better thermal shock resistance. Aluminium sol not only acts as a binder instead of some polyvinyl alcohol (PVA), but also reacts with silica to form mullite, which improves the properties and microstructure of the ceramics by increasing corundum and mullite phases.
Wei Pan and Jianghong Gong
B. J. Cheng, X. Z. Guo, L. Li, D. Y. Li, "Effect of Aluminium Sol on Microstructure and Properties of Corundum-Mullite Ceramic", Key Engineering Materials, Vols. 336-338, pp. 1333-1336, 2007