关键词: Al₁₃ 氯化铝, 莫来石, 低温合成

Abstract:

:Mullite was synthesized with [ AlO₄Al₁₂（OH）₂₄（H₂O）₁₂] ^7＋ （ abbreviated to Al₁₃ ） or aluminum chloride as the aluminium source and with sodium silicate or activated silicic acid as the silicon source, respectively. And, the synthesis process and material microstructure evolvement were investigated by means of 27Al NMR, XRD and infrared absorption spectroscopy. The results indicate that  the synthesis of mullite with Al₁₃ as the aluminum source can perform at lower temperature;  after the sintering at 900 ℃ and 1 200 ℃, the mullite precursor prepared with Al₁₃ and activated silicic acid transforms respectively into mullite and single-phase mullite, because of the Si-O-Al bonds formed in the mullite-like precursor.

Key words: Al₁₃, aluminum chloride, mullite, low-temperature synthesis