将超声波应用于以硝酸铝、碳酸氢氨为原料制备纳米氧化铝粉末的工艺中,研究了反应物浓度、分散剂用量和煅烧时间对氧化铝粒径的影响.用SPM400型扫描探针显微镜对粒径和形貌进行了表征.结果表明:在超声场中,当硝酸铝浓度为0.1 mol/L,煅烧温度为900 ℃,碳酸氢氨浓度为0.8 mol/L,PEG6000的质量分数为7%,煅烧时间在1.25 h时可制得粒径为50 nm左右的纳米氧化铝粉,其形貌近似球形;但过高的频率不利于纳米氧化铝粉的获得.

The nanosized alumina powders were synthesized by aluminum nitrate and ammonium bicarbonate as raw materials in ultrasonic field.The effects of reactant concentration,disperser amounts,calcination time on alumina size were investigated systematically.The morphology and size of powders were characterized by SPM400 scanning probe micrographs.At 900 ℃,the size of alumina powders,as-prepared,was about 50 nm,when the concentration of aluminum nitrate and ammonium bicarbonate was 0.1 mol/L and 0.8 mol/L respectively,the percentage of PEG6000 was about 7%,calcinations time was around 1.25 h.And its morphology was similar to that of a ball.But too high ultrasonic frequency made against obtaining nanosized alumina powders.