镁铝尖晶石纳米前驱体溶胶的制备及表征  

Synthesis and Characterization of Magnesium Aluminate Spinel Precursor Sol

作　　者：席子建 魏军从 涂军波 马伟平 XI Zi-jian;WEI Jun-cong;TU Jun-bo;MA Wei-ping(Hebei Province Key Laboratory of Inorganic Nonmetallic Materials,North China University of Science and Technology,Tangshan Hebei 063210,China;Hebei Guoliang New Materials Co.,Ltd,Tangshan Hebei 063009,China)

机构地区：[1]华北理工大学河北省无机非金属材料重点实验室,河北唐山063210 [2]河北国亮新材料有限公司,河北唐山063009

出　　处：《华北理工大学学报（自然科学版）》2025年第1期1-6,共6页Journal of North China University of Science and Technology：Natural Science Edition

基　　金：河北省自然科学基金资助项目(E2023209035):碳化物调控膨胀石墨制备及其在低碳耐火材料中的结构演变;河北省科技领军企业能力提升项目(22140207J):轻烧无铬复合透气元件的研制。

摘　　要：以六水氯化镁和六水氯化铝为主要原料,氨水为沉淀剂,利用共沉淀法制备了镁铝尖晶石前驱体溶胶。测定了溶胶的固体含量、pH值和密度,对凝胶作用后的粉体进行了综合热分析,红外光谱分析、XRD和TEM。研究表明:使用共沉淀法制备的镁铝尖晶石前驱体溶胶胶粒为水滑石Mg_(2)Al(OH)_(7)和Al(OH)_(3)的无定型混合物,溶胶固体含量为5.8%,密度为1.21 g/cm^(3)。干凝胶粉受热时Mg_(2)Al(OH)_(7)和Al(OH)_(3)发生分解,500℃时开始形成镁铝尖晶石雏晶,700℃时镁铝尖晶石形成的粒径较小,约为15 nm。继续升高煅烧温度,镁铝尖晶石晶格趋于完善,平均晶粒尺寸增大。Magnesium aluminate precursor sol were prepared using aluminium chloride hexahydrate as alumina source,magnesium chloride hexahydrate as magnesia source,and ammonia as a precipitating agent.The solid content,pH value and density of the sol were determined.The gel powder was analyzed by thermal analysis,infrared spectrum analysis,XRD and TEM.The results showed that the colloidal particle of precursor sol was a hybrid mixture of Mg_(2)Al(OH)_(7) and Al(OH)_(3),The solid content of as prepared sol was 5.8%and the density 1.21 g/cm^(3).When the dry gel powder is heated,Mg_(2)Al(OH)_(7) and Al(OH),decompose,and MG-Al spinel crystals begin to form at 500 ℃,and the particle size of Mg-Al spinel is smaller at 700 ℃,about 15 nm.As further increasing the heat treatment temperature,the lattice of magnesium aluminate spinel tends to be perfect and the average grain size increases.

关 键 词：镁铝尖晶石纳米前驱体溶胶 共沉淀法 纳米晶 

分 类 号：TQ175[化学工程—硅酸盐工业]