| 低温燃烧合成制备非晶氧化铝及其晶型转变 |
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| 引用本文： | 魏坤霞,赵昆渝,魏伟,朱心昆.低温燃烧合成制备非晶氧化铝及其晶型转变[J].兵器材料科学与工程,2005,28(2):41-44. |
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| 作者姓名： | 魏坤霞 赵昆渝 魏伟 朱心昆 |
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| 作者单位： | 江苏工业学院,材料科学与工程系,江苏,常州,213016;昆明理工大学,材料与冶金工程学院,昆明,650093;南京理工大学,材料科学与工程系,江苏,南京,210094 |
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| 摘 要： | 以硝酸铝和尿素为原料(质量比为2.5:1),采用低温燃烧合成法制备了不同晶态的超细Al2O3,对在300℃时点火获得的非晶Al2O3进行了煅烧处理。XRD分析发现,由低温燃烧合成制备的非晶态Al2O3向α相转变的温度≥1000℃,晶化过程中仅发生非晶→γ→α的相变。TEM与选区衍射表明当预热温度小于400℃时,可以获得非晶Al2O3,并呈现出不规则片状,尺寸在200-400nm。
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| 关 键 词： | 低温燃烧合成 Al2O3 煅烧 |
| 文章编号： | 1004-244X(2005)02-0041-03 |
| 修稿时间： | 2004年7月19日 |
Structural transformation of amorphous Al2O3 prepared by low-temperature combustion synthesis |
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| WEI Kun-xia,ZHAO Kun-yu,WEI Wei,ZHU Xin-kun.Structural transformation of amorphous Al2O3 prepared by low-temperature combustion synthesis[J].Ordnance Material Science and Engineering,2005,28(2):41-44. |
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| Authors: | WEI Kun-xia ZHAO Kun-yu WEI Wei ZHU Xin-kun |
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| Abstract: | Ultrafine powders of Al2O3 are prepared by low - temperature combustion synthesis (LCS), in which the reaction matters are aluminium nitrate and carbamide (the mass ratio of 2. 5:1). Amorphous Al2O3 obtained at the igniting temperature of 300℃ is sintered. It is found that the phase transformation temperature from amorphous Al2O3 to α - Al2O3 is more than 1 000 ℃ by XRD, and the process of phase transformation is amorphous→γ→α. Amorphous Al2O3 can be obtained when the igniting temperature is less than 400℃, whose shape is anomalously layered and the size from 200 to 400 nanometer by transmission electron microscopy (TEM) and selected area diffraction (SAD). |
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| Keywords: | Al2O3 |
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