溶剂成分对于火焰合成YSZ颗粒的影响

Effects of Solvent Composition on Morphology and Size Distribution of YSZ Particles Synthesized by Flame Spray Pyrolysis

本文采用火焰喷雾裂解法(FSP)合成了氧化钇稳定氧化锆(YSZ)微纳颗粒,研究了溶剂成分对合成的颗粒形态及粒径的影响,并利用XRD和SEM对生成的颗粒进行了表征.结果表明不同溶剂获得的颗粒晶型均为四方相(t相).采用蒸馏水作为溶剂时,除生成亚微米的球形致密颗粒外,还有许多微米大小的破壳形态颗粒生成.采用乙醇作溶剂时,仅有亚微米大小的球形致密颗粒生成。采用乙醇和2-乙基己酸(2-EHA)混合物作溶剂时,生成的颗粒粒径呈现双峰分布;既生成了球形致密的亚微米大颗粒,又观察到有絮状形态的纳米颗粒生成.实验发现合成颗粒的粒径受乙醇和2-EHA的配比控制.随着混合溶剂中2-EHA含量增加,亚微米大颗粒逐渐减少,纳米颗粒逐渐增多,本文对其生成机理进行了分析.

Yttria-stabilized zirconia （YSZ） ultrafine particles were synthesized by flame spray pyrolysis method and the effects of solvent composition on morphology and particle size were studied. Particles were examined by using X-ray diffractometry （XRD） and scanning electron microscope （SEM）. Only tetragonal phase particles were synthesized by using different precursor solutions. SEM results showed dense and spherical submicron-sized particles as well as micron-sized cracked shell-like structures were prepared from distilled water solution. While, when applying ethanol as solvent, there were only dense and spherical submicron-sized particles formed. When ethanol and 2-EHA mixture were used as solvent, the as-prepared particles exhibited a bimodel size distribution, both submicron- and nano- sized particles were observed. Particle size was controlled by varying the volume ratio of ethanol to 2-EHA. As the increase of 2-EHA＇s percentage in solvent, average size of as-prepared particles decreased. The mechanism of particle formation was analyzed in this paper.