Low temperature preparation of stabilized aluminium titanate ultrafine powder assisted by the soivothermai treatment process

摘要

Stabilized aluminium titanate (AT) ultrafine powder with the average particle size of 150 nm was prepared at 1000 °C assisted by the solvothermal process, using aluminium nitrate (Al(NO3)3'9H2O) and titanium tetrachloride (TiCl4) as precursor materials, ethanol as solvent, manganese(ll) or iron (HI) as stabilizer and PEG1000 as additive. The phase transition process of AT dry gel powder and the influence of technological parameters on the synthesis of stable AT superfine powder were studied by DTA-TG, XRD and TEM. The results showed that the amorphous dry gel formed anatase phase first, and then transformed into AI_(2-(1-x)Mg_xTi_(1+x)O5 solid solution. Magnesium acetate shows better stabilization effect compared with ferric chloride and ferric sulfate. Optimized dosages of magnesium acetate and PEG1000 are 10 mol% and 3 wt%, respectively.