不同工业氧化铝粉在NH4F存在下物相转变和微观形貌的差异  

Differences in Phase Transformation and Microstructure of Different Industrial Alumina Powder with Presence of NH_4F

作　　者：李小辉[1] 毕晓勤[1] 谷文静[2] 陈留刚[2] 赵义 叶国田[2] Li Xiaohui Bi Xiaoqin Gu Wenjing Chen Liugang Zhao Yi Ye Guotian(Henan University of Technology, School of Materials Science and Engineering, Zhengzhou 450001, China Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China Zhejiang Zili Alumina Material Technology Co. , Ltd. , Shangyu 312369, China)

机构地区：[1]河南工业大学材料科学与工程学院,河南郑州450001 [2]河南省高温功能材料重点实验室,郑州大学材料科学与工程学院,河南郑州450001 [3]浙江自立新材料股份有限公司,浙江上虞312369

出　　处：《山东化工》2017年第6期5-8,共4页Shandong Chemical Industry

摘　　要：以α-Al_2O_3含量不同的两种不同工业氧化铝粉为原料,引入2.0%NH_4F作为添加剂,经过700~1200℃煅烧,采用X射线衍射仪和扫描电子显微镜进行物相分析和微观形貌的观察。XRD结果表明,两种不同工业氧化铝经1200℃煅烧后全部转化为α-Al_2O_3。当2.0%含量的NH_4F存在时,α-Al_2O_3含量较高的工业氧化铝(A)在900℃煅烧后全部转化为α-Al_2O_3,而α-Al_2O_3含量较低的工业氧化铝(B)要在1000℃煅烧后才全部转化为α-Al_2O_3,即NH_4F促进两种不同工业氧化铝转化为α-Al_2O_3的效果是不同的。SEM结果表明,含2.0%NH_4F的两种工业氧化铝粉A和B在900℃烧后有明显差异,而在1000℃煅烧后两者微观形貌没有明显差异,这是因为二者在900℃煅烧后物相有明显不同,而在1000℃煅烧后两者物相基本相同。The phase composition and morphology of two kinds of industrial alumina powders with and without 2. 0% NH_4 F after firing at 700 ~ 1200℃ were analyzed by X-ray diffraction（XRD） and scanning electron microscope（SEM）. Both of the two industrial alumina powders were totally transferred into α-Al_2O_3 after firing at 1200℃. When 2. 0% NH_4 F was incorporated in the two alumina powders,the sample with higher α-Al_2O_3content（A） was completely transferred into α-Al_2O_3 at 900 ℃,whereas the phase transformation of the sample with lower α-Al_2O_3content（B） was not completed until at 1000℃. The results indicate that the addition of 2. 0% NH_4 F has a different effect on the phase transformation into α-Al_2O_3 in the two industrial alumina powders. The morphologies of the two powders with 2. 0% NH_4 F are different after firing at 900℃,but little difference was observed after firing at 1000℃. This is possibly because the phase compositions of the two samples are different at 900℃,but are almost the same at 1000℃.

关 键 词：工业氧化铝粉 物相转变 微观形貌 NH4F 

分 类 号：TF123[冶金工程—粉末冶金]