非水解和水解溶胶-凝胶法合成MgAl_2O_4粉体对比研究  

Comparative Research on the Preparation of MgAl_2O_4 Powders by Non-hydrolytic and Hydrolytic Sol-gel Method

作　　者：魏恒勇[1,2,3] 王合洋[1,3] 魏颖娜[1,3] 杨金萍[1,3] 于云[2] 卜景龙[1,3] 

机构地区：[1]河北联合大学材料科学与工程学院,唐山063009 [2]中国科学院特种无机涂层重点实验室,上海200050 [3]河北省无机非金属材料重点实验室,唐山063009

出　　处：《人工晶体学报》2013年第7期1384-1389,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51272066);中国科学院特种无机涂层重点实验室开放课题基金(KLICM-2011-01);河北省高等学校科学技术研究青年基金项目(2011124)

摘　　要：分别采用非水解和水解溶胶-凝胶法制备MgAl2O4粉体,利用DTA-TG、XRD和FE-SEM等研究了凝胶煅烧过程中的相变化、粉体形貌及其烧结性能。研究表明,水解凝胶经900℃煅烧0.5 h后可形成大量镁铝尖晶石晶相,但仍有少量的方镁石相存在,非水解凝胶经900℃煅烧0.5 h后只有镁铝尖晶石晶相。采用水解和非水解法所合成MgAl2O4粉体的平均粒径分别为90 nm和50 nm,其经1600℃烧结3 h后晶粒尺寸分别为1～2μm和0.5～1μm,晶粒多呈八面体形状,相比之下,采用水解法时MgAl2O4晶体发育较好,出现了明显的生长台阶。MgAl2O4 powder was synthesized via non-hydrolytic and hydrolytic sol-gel method,respectively.The phase transformation,the particle morphology and sintering properties of MgAl2O4 powders were studied by DTA-TG,XRD and FE-SEM analysis.The results showed that there existed the MgAl2O4 spinel phase with a little of periclase phase,when the hydrolytic xerogels were calcined at 900 ℃ for 0.5 h.There only was the single-phase MgAl2O4 spinel,after the non-hydrolytic xerogels were calcined at 900 ℃ for 0.5 h.The average powder size of MgAl2O4 spinel powders synthesized by hydrolytic and non-hydrolytic sol-gel method was 90 nm and 50 nm,respectively.When the synthesized MgAl2O4 spinel powders were sintered at 1600 ℃ for 3 h,most crystal grain were octahedra shape and their averge size was 1-2 μm and 0.5-1 μm,respectively.For the sintered sample prepared by hydrolytic sol-gel methrod,the MgAl2O4 spinel crystal growth was better and displayed more visible growth step.

关 键 词：非水解溶胶-凝胶法 水解溶胶-凝胶法 镁铝尖晶石 

分 类 号：TQ174[化学工程—陶瓷工业]