The Al-AlN bonded corundum based refractories was synthesized with the starting materials of fused alumina and metallic aluminium in nitrogen atmosphere through in-situ reaction. The study indicated that with the addition of 14% metallic aluminium (13% of Al powder and 1% of Al fiber), the material nitridized at 1 100 ℃ for 3 h has excellent physical properties. It is found that a massive quantity of AlN in the forms of both whiskers and hexagon pellet particles is formed, and a large quantity of Al remained in the matrix. This multiple bonding system resulted in the excellent mechanical properties of the material. It is also found that the hydration tendency of the prepared material is inhibited, and the material exhibited excellent thermal shock resistance. The nature of protective oxidation of the bonding system is characterized. Thus, this material may become a new candidate of carbon-free sliding plate material for continuous casting.
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