在800℃下煅烧Al(OH)3和MgSO4混合粉末, 冷却后经过水洗得到了结晶良好的MgAl2O4纳米粉体. 采用DSC/TG、XRD、TEM和SEM等分析手段研究了混合粉末中Mg/Al原子比对颗粒尺寸及团聚状况的影响, 以及MgAl2O4纳米粉体的烧结性能. 所制备的MgAl2O4纳米粉体平均颗粒尺寸为12 nm, 尺寸分布窄, 团聚少. MgAl2O4的生成归因于γ-Al2O3和MgSO4的固相反应. MgAl2O4纳米粉体显示了良好的烧结活性, 在1450℃烧结1 h即能获得相对密度为95%的MgAl2O4陶瓷.
Well-crystallized MgAl2O4 nanopowders were prepared by calcining a powder mixture of Al(OH)3 and MgSO4 at 800℃, and then washing with water. The effect of Mg/Al atomic ratios on the particle sizes and agglomeration degrees, and sintering behavior of MgAl2O4 nanopowders were studied by differential thermal and thermogravimetric analysis (DSC/TG), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The obtained MgAl2O4 nanopowders have an average particle size of 12 nm, a narrow size distribution, and weak agglomeration. The formation of MgAl2O4 can be attributed to a solid-state reaction between γ-Al2O3 and MgSO4. Besides, these MgAl2O4 nanopowders own an excellent sinterability, e.g., a relative density of 95% can be achieved after sintered at 1450℃ for 1 h.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | Huang Cun-Xin, Peng Zai-Xue, Wang Yan-Peng, et al. Study on transparent mechanism of polycrystalline MgAl2O4. Journal of Synthetic Crystals, 1995, 24(3): 198-202.[2] Liu Wei, Wu Deng-Hui. Preparation of ultrafine magnesium aluminate spinel powders by alkoxide hydrolysis process. Shandong Ceramics, 2009, 32(1): 33-35.[3] Yuan Ying, Zhang Shu-Ren, You Wen-Nan. Aluminium semi-alkoxide Sol-Gel synthesis and sintering behavior of MgAl2O4 spinel powder. Journal of Inorganic Materials, 2004, 19(4): 755-760.[4] Zhang Xian, Zeng Qing-Feng, Hao Fu-Suo. Synthesis of MgAl2O4 spinel nanopowder by Sol-Gel process. Bulletin of the Chinese Ceramic Society, 2009, 28(S1): 130-133.[5] Li J G, Ikegami T, Lee J H, et al. A wet-chemical process yielding reactive magnesium aluminate spinel (MgAl2O4) powder. Ceram. Int., 2001, 27(4): 481-489.[6] Shiono T, Shiono K, Miyamoto K, et al. Synthesis and characterization of (MgAl2O4) spinel precursor from a heterogeneous alkoxide solution containing fine MgO powder. J. Am. Ceram. Soc., 2000, 83(1): 235-237.[7] Ye G, Oprea G, Troczynski T. Synthesis of MgAl2O4 spinel powder by combination of Sol-Gel and precipitation processes. J. Am. Ceram. Soc., 2005, 88(11): 3241-3244.[8] Saberi A, Golestani-Fard F, Willert-Porada M, et al. A novel approach to synthesis of nanosize MgAl2O4 spinel powder through Sol-Gel citrate technique and subsequent heat treatment. Ceram. Int., 2009, 35(3): 933-937.[9] Li G, Sun Z, Chen C, et al. Synthesis of nanocrystalline MgAl2O4 spinel powders by a novel chemical method. Mater. Lett., 2007, 61(17): 3585-3588.[10] Lee P Y, Suematsu H, Yano T, et al. Synthesis and characterization of nanocrystalline MgAl2O4 spinel by polymerized complex method. J. Nanopart. Res., 2006, 8(6): 911-917.[11] Alinejad B, Sarpoolaky H, Beitollahi A, et al. Synthesis and characterization of nanocrystalline MgAl2O4 spinel via sucrose process. Mater. Res. Bull., 2008, 43(5): 1188-1194.[12] Iano- R, Laz-u R. Combustion synthesis, characterization and sintering behavior of magnesium aluminate (MgAl2O4) powders. Mater. Chem. Phys., 2009, 115(2/3): 645-648.[13] Domanski D, Urretavizcaya G, Castro F J, et al. Mechanochemical synthesis of magnesium aluminate spinel powder at room temperature. J. Am. Ceram. Soc., 2004, 87(11): 2020-2024.[14] Ple-ingerová |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%