关键词: 六铝酸钙, 固含量, 显微结构, 耐压强度

Abstract: To study the effect of the slurry solid loading on their properties,lightweight calcium hexaluminate materials were prepared using active alumina (d₅₀=1.9 μm) and calcium hydroxide (d₅₀=4.3 μm) as starting materials by foaming-gel casting.The effects of the solid loading in the slurry (50%,52.5%,55%,57.5% and 60%,by volume,respectively) on the phase composition,the microstructure and the properties of the fired samples were studied.The results show that after high temperature treatment,flake calcium hexaluminate crystals in the samples prepared by foaming-gel casting are interwoven to form a large number of micropores smaller than 5 μm,accounting for more than 50% of total pores.In this study,with the solid loading of 57.5%,the sample has the best properties,performing the cold compressive strength of 9.4 MPa.

Key words: calcium hexaluminate, solid loading, microstructure, compressive strength