采用乙二胺四乙酸(EDTA)-硝酸盐、溶胶-凝胶低温自蔓延燃烧法合成了Sm0.15Gd0.05Ce0.8O1.9(SGDC)纳米粉体,研究了以不同分散方式和分散时间制备的SGDC在各种烧结温度下的致密化行为.为更好地考察团聚对SGDC致密化的影响,本实验引入团聚体系数(Coagulation factor)来具体表征和量化纳米SGDC的团聚程度.结果表明:团聚在烧结过程中,严重阻碍和抑制了SGDC的致密化;在同一烧结温度下,团聚体系数较低的固溶体具有更高的烧结致密度.通过高剪切乳化分散后,SGDC的团聚体系数为1.04时,烧结致密化温度可降低至1300℃.这个温度比以前文献中所报道的1400～1600 ℃的烧结温度要低得多.通过对团聚的控制,显著改善了SGDC电解质的烧结性能.
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