Mullite-aluminum titanate composite material as well as preparation method and application thereof: Fid-Bau Portal

Mullite-aluminum titanate composite material as well as preparation method and application thereof

ZHANG JIANBO / YANG CHENNIAN / LI HUIQUAN / LI SHAOPENG

The invention relates to a mullite-aluminum titanate composite material as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing an alkali medium and fly ash, carrying out liquid-solid separation to obtain a solid phase, and sequentially washing and drying the solid phase to obtain desiliconized powder; (2) forming and sintering first mixed corundum, titanium dioxide and the desiliconized powder obtained in the step (1) in sequence to obtain the mullite-aluminum titanate composite material, or, the second mixed aluminum titanate powder and the desiliconized powder obtained in the step (1) are subjected to forming and sintering treatment in sequence, and the mullite-aluminum titanate composite material is obtained, the aluminum titanate powder in the step (2) is obtained by sequentially mixing corundum and titanium dioxide and carrying out heat treatment. The fly ash is subjected to desiliconization treatment, the mechanical strength of aluminum titanate is improved by utilizing mullite, and the obtained mullite-aluminum titanate composite material has high strength and thermal stability and low thermal expansion rate.

本发明涉及一种莫来石‑钛酸铝复合材料及其制备方法与应用，所述制备方法包括如下步骤：(1)混合碱介质与粉煤灰，液固分离后所得固相依次经洗涤与干燥，得到脱硅粉体；(2)第一混合刚玉、二氧化钛以及步骤(1)所得脱硅粉体，依次经成型与烧结处理，得到所述莫来石‑钛酸铝复合材料；或，第二混合钛酸铝粉体与步骤(1)所得脱硅粉体，依次经成型与烧结处理，得到所述莫来石‑钛酸铝复合材料；步骤(2)所述钛酸铝粉体由刚玉与二氧化钛依次经混料与热处理得到。本发明将粉煤灰进行脱硅处理，利用莫来石提升钛酸铝的力学强度，所得莫来石‑钛酸铝复合材料具有高强度与热稳定性以及低热膨胀率。

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