关键词: 硅钙材料, 硬硅钙石, 水热法, 硅源, 高温强度

Abstract:

The effect of silicon source on properties silica calcia materials prepared by hydrothermal method using fused quartz powder,white carbon black and silica sol as silicon sources,calcium hydroxide as calcium source was researched.The results show that no xonotlite phase forms when using fused quartz as the silicon source,and the xonotlite fiber forms in the materials with the white carbon black or silica sol as the silicon source.Silica sol has higher activity,leading to higher xonotlite content with a needle-like structure.The formation of xonotlite determines the cold and high temperature properties of silica calcia materials.In the specimen with silica sol,the xonotlite needle-like fiber intertweares,leading to an excellent high temperature strength.

Key words: silica calcia materials, xonotlite, hydrothermal method, silicon source, high temperature strength