Fabrication and Characterization of Porous Mullite Coating on Porous Silicon Carbide Support

摘要

Mullite powders of stoichiometric composition were synthesized by sol-gel process with TEOS and Al(NO_3)_3·9H_2O as silicon and aluminum source. Homogeneous mullite powders were used as the starting materials to prepare the porous mullite coating on the porous silicon carbide support by repeated dip-coating method. XRD analysis revealed that the mullite precursor gels almost completely transformed to orthorhombic crystalline mullite at 1200℃. The average pore diameter and porosity of the porous mullite coating were about 4.5 μm and 52.3%, respectively.