Abstract
An innovative approach was developed for the fabrication of AlN-Al2O3 porous ceramic by heat-treating Al4O4C porous ceramic under a flowing nitrogen atmosphere. The effects of sintering temperature on phase and microstructural evolution changes were investigated. The results indicated that phase evolution of the nitridation of Al4O4C porous ceramics was significantly different from dense Al4O4C ceramics. AlN-Al2O3 porous ceramic produced using this new method had a homogeneous local chemical composition with the two phases tightly combined in the composite material. Possible reaction mechanisms for the fabrication of AlN-Al2O3 porous ceramic are discussed by considering reactions at the initial and later stages during the nitridation process.
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