室温固相反应制备超细前驱体及其分散性的研究

STUDY ON THE PREPARATION AND DISPERSION OF ULTRA FINE PRECURSOR BY SOLID STATE REACTION AT AMBIENT TEMPERATURE

研究以结晶氯化铝和碳酸氢铵为原料,采用室温固相反应制备尺寸均一、颗粒细小分散的包含有少量纳米晶γ-AlOOH的碱式碳酸铝铵前驱体。用XRD、Zeta电位及粒度分析仪表征,研究了超声分散、聚乙二醇聚合度及其加入量和pH值等对制备超细前驱体的影响。结果表明:在超声分散及酸性条件下,PEG为不同分子量匹配得到的前驱体,在水中的分散和稳定性最好,并制备出比表面高达66.32m2/g(1100℃煅烧)的纳米α-Al2O3粉体。

The monodisperse ultrafine of precursor Ammonium aluminium carbonate hydroxide（AACH）, with a small quantity of nanometer crystal γ-AIOOH, was prepared by solid state reaction with AlCl3 .6H2O and NH4HCO3 as raw materials at ambient temperature. The influences of supersonic dispersion, pH value and the concentrations degree of polymerization of polyethylene glycol dispersers on the size distributions were studied by using XRD, Zeta potential and size analysis. The results of experiments show that different PEG molecular weight matching with optimizing concentrations in there applicable range under supersonic dispersion and acid conditions so that preferable aqueous suspension can be obtained by this dispersing procedure. The nanometer α-Al2O3 powder with surface area of 66.32M^2/g was obtained by using tiffs method.