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Controlled morphologies and hydration process of hydratable alumina by using citric acid

作者	Xu, Nana^[1];Li, Yuanbing^[2];Li, Shujing^[3];Wang, Hailu^[4];Xiang, Ruofei^[5];Ouyang, Si^[6]
文献类型	期刊
机构	[1]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.;Wuhan Univ Sci & Technol WUST, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Mail Box 181, Wuhan 430081, Peoples R China.; [2]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.;Wuhan Univ Sci & Technol WUST, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Mail Box 181, Wuhan 430081, Peoples R China.; [3]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.;Wuhan Univ Sci & Technol WUST, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Mail Box 181, Wuhan 430081, Peoples R China.; [4]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.; [5]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.;Wuhan Univ Sci & Technol WUST, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Mail Box 181, Wuhan 430081, Peoples R China.; [6]Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.; ↓
通讯作者	Li, YB (corresponding author), Wuhan Univ Sci & Technol WUST, State Key Lab Refractories & Met, Dept Mat Sci & Engn, Mail Box 181, Wuhan 430081, Peoples R China.; Li, YB (corresponding author), Wuhan Univ Sci & Technol WUST, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Mail Box 181, Wuhan 430081, Peoples R China.
期刊名称	JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY影响因子和分区
年	2020
卷	56
期	4
页码范围	1427-1433
增刊	正刊
收录情况	SCI(E)(WOS:000539873600001) EI(20202508837032)
期刊等级
所属部门	耐火材料与冶金国家重点实验室
百度学术	Controlled morphologies and hydration process of hydratable alumina by using citric acid
语言	外文
ISSN	2510-1560
DOI	10.1007/s41779-020-00483-z
人气指数	34
浏览次数	34
基金	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51772221, 51502213]; Key Program of Natural Science Foundation of Hubei Province (China) [2017CFA004]
关键词	Hydratable alumina; Citric acid; Crystallinity; Dehydration; Microstructures
摘要	Hydration mechanisms of hydratable alumina (HA) in citric acid at different pH are investigated in this study, aiming to improve rapid hydration process and massive hydration heat. By adding citric acid to adjust solution pHs to 2, 3, and 4, the crystal phase, morphologies, and microstructure of the HA hydrates are characterized by X-ray powder diffraction (XRD), differential scanning calorimetry (TG-DSC), and transmission electron microscopy (TEM), respectively. The results show that HA exhibits different hydration behaviors in different concentrations of acidic solutions. With decreasing pH of citric acid, the crystallinity of HA decreases whereas the dehydration process slows down. Excessive citric acid could displace hydroxyl which generates from pseudoboehmite gel. Meanwhile, the excess citrate ion can be absorbed on the surface of HA by forming numerous micelles, then compound to inhibit further hydration. Proper addition of citric acid helps to delay the hydration of HA and achieve better balance between bonding performance and hydration speed.