以硫酸铝、氯化铝和尿素作为原料,在90℃条件下利用化学沉淀法制备了α-Al2 O3粉末,探讨了活性剂PEG和NaCl的含量对颗粒形貌、尺寸和团聚情况的影响.利用XRD、SEM和TG/DSC对样品进行表征,结果表明:聚乙二醇(PEG)可以提高粉体的分散性,由TG曲线可知前躯体为无定形的AlOOH·0.25H2O,PEG的吸附效率为13.2％.前躯体在600℃和800℃煅烧2h得到无形定的Al2 O3和γ-Al2 O3,1000℃即转变为α-Al2O3并伴随Na2 SO4的特征峰,1200℃完全转变为α-Al2 O3.加入一定量的NaCl能防止α-Al2O3粉末在1000℃高温煅烧时的团聚,[ NaCl] =0.05 mol/L时能获得0.5 μm的分散较好的球形α-Al2 O3颗粒；当[NaCl] =0.1 mol/L时能获得大量纳米尺寸的球形α-Al2 O3颗粒；当[NaCl] ≥0.15 mol/L时,α-Al2 O3颗粒团聚严重.
参考文献
| [1] | 李江,潘裕柏,陈志刚,郭景坤.湿化学法制备α-Al2O3纳米粉[J].硅酸盐通报,2003(01):92-95. |
| [2] | 陈兴,杨建,丘泰.Al2O3加入量对AlN-Al2O3复相陶瓷制备及性能的影响[J].人工晶体学报,2010(06):1422-1428. |
| [3] | Ismagilov Z R;Shkrabina R A;Koryabkina N A et al.New technology for production of spherical alumina supports for fluidized bed combustion[J].Catalysis Today,1999,47:51-71. |
| [4] | Liangmiao Zhang;Wencong Lu;Liuming Yan .Hydrothermal synthesis and characterization of core/shell ALOOH microspheres[J].Microporous and Mesoporous Materials,2009(1/3):208-216. |
| [5] | 王志强,马铁成,蔡英骥,吕秉玲.超细α-Al2O3的低温燃烧合成及其烧结特性的研究[J].硅酸盐通报,2000(05):28-31. |
| [6] | F. Kara;G. Sahin .Hydrated aluminium sulfate precipitation by enzyme- catalysed urea decomposition[J].Journal of the European Ceramic Society,2000(6):689-694. |
| [7] | Suresh K;Selvarajan V;Vijay M .Synthesis of nanophase alumina, and spheroidization of alumina particles, and phase transition studies through DC thermal plasma processing[J].Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology,2008(8):814-820. |
| [8] | Strekopytov S;Exley C .Thermal analyses of aluminium hydroxide and hydroxyaluminosilicates[J].Polyhedron: The International Journal for Inorganic and Organometallic Chemistry,2006(8):1707-1713. |
| [9] | Joo Hyun Kim;Kyeong Youl Jung;Kyun Young Park .Characterization of mesoporous alumina particles prepared by spray pyrolysis of Al(NO3)2·9H2O precursor: Effect of CTAB and urea[J].Microporous and mesoporous materials: The offical journal of the International Zeolite Association,2010(1/3):85-90. |
| [10] | Zhang R;Somasundaran P .Advances in adsorption of surfactants and their mixtures at solid/solution interfaces[J].Advances in colloid and interface science,2006(0):213-229. |
| [11] | Kunieda H.;Aramaki K.;Shigeta K.;Kabir H. .Phase behavior of mixed polyoxyethylene-type nonionic surfactants in water[J].Journal of Molecular Liquids,2001(1-3 Special Issue SI):157-166. |
| [12] | 杜雪莲 .单分散α-Al2 O3纳米颗粒粉体的制备与表征[D].兰州:兰州大学,2008. |
| [13] | Rowlands WN.;Hunter RJ.;Patrick V.;Obrien RW. .SURFACE PROPERTIES OF ALUMINUM HYDROXIDE AT HIGH SALT CONCENTRATION[J].Journal of Colloid and Interface Science,1997(2):325-335. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%