Comparative Analysis of the Differential Influence of Aluminum Fluoride on the Formation of Alumina and Aluminum Hydroxide
In this paper,the influence of aluminum fluoride was introduced in comparative experiments on the structural properties of the generated mullite,and the generated mullite was tested with different precursors of alumina and aluminum hydroxide,from the aspects of material composition,microstructure,mechanical properties and phase composition.Through comparative analysis,the introduction of aluminum fluoride can promote the growth and orientation of the generated mullite crystal,normalize the grain shape and improve the normal temperature bending strength of the material;Aluminum hydroxide can promote the transformation of mullite more completely,lower the amorphous phase ratio,make the crystal boundary clearer,reduce the strength but improve the thermal stability performance;The simultaneous participation of aluminum hydroxide and aluminum fluoride makes the interface more complex,improves the material strength,and the thermal stability is not significantly improved.
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