将硝酸镁、硝酸铝、尿素按物质的量比为126．66制得透明混合前驱液，用低温燃烧技术与微波加热技术相结合的方法制备了高纯度、低团聚的镁铝尖晶石（MgAl2 O4）粉体。研究了燃烧反应过程中，微波输出功率（200、400、600、700 W）对MgAl2 O4粉体晶体结构、形貌及比表面积的影响。结果表明：微波高效加热方式导致燃烧反应瞬间产生大量气体，促进了MgAl2 O4超细颗粒的形成。同时，随着微波输出功率的增加，尿素氧化加速，利于MgAl2 O4晶粒的生长发育。在微波功率700 W，微波时间2 min的条件下，可制备结晶完整，粒度分布均匀（平均晶粒尺寸为56．03 nm）的MgAl2O4粉体。
High purity,low agglomeration MgAl2O4 powders were synthesized by the microwave-assisted low temperature combustion method using magnesium nitrate,aluminum nitrate and urea (mass ratio of 1 2 6.66) as starting materials,mixing in water forming a transparent precursor liquid.The effects of the microwave out-put power (200,400,600,and 700 W)on the microstructure,morphology and specific surface area of MgAl2O4 powders were analyzed.The results show that the microwave-assisted combustion method can accelerate combusti on reacti on to produce l arge vol umes of gas i nstantl y,formi ng ul tra-fi ne MgAl 2 O4 parti cl es.Moreo-ver,the increasing microwave output power accelerates the oxidation of urea,which is beneficial to the growth of MgAl2O4 grains.Under the conditions of microwave power 700 W for 2 min,the high crystallinity MgAl 2 O4 powder wi th a uni form parti cl e si ze di stri buti on (average grai n si ze of 56.03 nm)can be prepared.
参考文献
| [1] | 李戬,童世合.燃烧法制备镁铝尖晶石粉体及其烧结活性研究[J].耐火材料,2011(03):174-176. |
| [2] | 白佳海,刘俊成.纳米MgAl2O4粉体的溶液燃烧合成及烧结性能[J].硅酸盐学报,2010(05):969-973. |
| [3] | 赵君红,魏恒勇,魏颖娜,于云,魏诗琪,卜景龙,王瑞生.非水解sol-gel法合成MgAl2O4纳米粉体[J].耐火材料,2012(06):421-423. |
| [4] | Mehdi Ranjbar;Mohammad Ali Taher;S. Mostafa Hosseinpour-Mashkani .Influence of Microwave Synthesis Parameters on the Size and Morphology of the Resulting MgAl_2O_4 Nanoparticles[J].Journal of cluster science,2013(4):959-967. |
| [5] | I. Ganesh;R. Johnson;G.V.N. Rao .Microwave-assisted combustion synthesis of nanocrystalline MgAl_2O_4 spinel powder[J].Ceramics International,2005(1):67-74. |
| [6] | Jain S R;Adiga K C;Pai V R.A new approach to thermochemical calculations of condensed fuel-oxidizer mixtures[J].Combustion and Flame,1981(40):71-79. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%