摘要
用溶胶-凝胶法合成了含氧化钛质量分数为10wt.%、30wt.%和50wt.%的氧化铝-氧化钛纳米复合粉末和单纯氧化铝纳米粉末,用溶胶-凝胶法合成的氢氧化物前驱体在700-1200℃锻烧2h转变为相应的氧化物,用XRD和TEM对氧化铝-氧化钛纳米复合粉末的形貌、微结构和晶相进行表征,结果表明,二氧化钛质量含量每增加约20wt.%,复合氧化物中氧化铝的α相转变温度就降低100℃,随着氧化钛加入量的增加,复合氧化物的晶粒迅速减小。第二相的加入有效地抑制了氧化铝基体晶粒的快速长大。添加质量分数为30wt.%氧化钛且在1000℃下煅烧的样品拥有25-32nm的最小晶粒。
A series of Al2O3-TiO2 mixed oxides with different TiO2 contents （10 wt.%, 30 wt.%, and 50 wt.% ） and the single Al2O3 oxide were prepared by alkoxide hydrolysis method. The hydroxide precursors were changed into their corresponding oxides after calcined at from 700 ℃ to 1200 ℃ for 2 hours. The evolution of the morphology, microstructures, and phase transformation of the Al2O3-TiO2 oxides were investigated by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. Results show that the α-Al2O3 transform temperature decreases 100 ℃ as the TiO2 content of Al2O3TiO2 mixed oxides increases 20 wt.%. The average grain size of the mixed nanopowders decreases quickly with increasing TiO2 content weight percent. The presence of the second phase effectively limits a rapid grain growth of the matrix alumina. The sample adding 30 wt.% of TiO2 calcined at 1000 ℃ has the smallest grain size with 25-32 nm.
出处
《纳米科技》
2010年第2期67-71,80,共6页
