燃烧条件对自蔓延高温合成Al2O3/AlB12复相陶瓷粉体特性的影响

无机材料学报

燃烧条件对自蔓延高温合成Al₂O₃/AlB₁₂复相陶瓷粉体特性的影响

刘永合^1,2; 殷声¹; 赖和怡²

1. 北京科技大学材料科学与工程学院; 北京 100083;2. 山东工业大学材料科学与工程学院; 济南 250014

收稿日期:1999-05-24 修回日期:1999-07-19 出版日期:2000-06-20 网络出版日期:2000-06-20

Effects of Combustion Conditions on the Characteristics of Al₂O₃/AlB₁₂ Composite Powders Produced by Self-Propagation High-Temperature Synthesis

LIU Yong-He^1,2; YIN Sheng¹; LAI He-Yi ²

1.School of Materials Science and Engineering; University of Science and Technology Beigjing; Beijing100083; China; 2.School of Materials Science and Engineering; Shandong University of Technology; Jinan250014; China

Received:1999-05-24 Revised:1999-07-19 Published:2000-06-20 Online:2000-06-20

摘要/Abstract

摘要： 以铝、B₂O₃为原料，利用自蔓延高温合成（SHS）制备了Al₂O₃／AlB₁₂复相陶瓷粉体，研究了燃烧条件对粉体特性的影响．结果发现，经球磨处理后，复相陶瓷粉体中Al₂O₃的平均粒径为3～4μm，AlB₁₂的粒度为亚微米级．粉体的比表面积为～1m²／g．燃烧过程中B₂O₃易于挥发，并在合成产物的表层生成B₂O₃和9Al₂O₃·2B₂O₃副产物相．在较低压力的氩气中进行合成，可以减少副产物相，获得纯度较高的复相陶瓷．与实际测量的燃烧温度对比发现，按照化学反应式13Al＋6B₂O₃＝6Al₂O₃＋AlB₁₂，通过热力学计算得到的绝热燃烧温度明显偏高．

关键词: 燃烧合成, Al₂O₃／AlB₁₂复相陶瓷, 绝热燃烧温度

Abstract: Al₂O₃/AlB₁₂ composite powders were produced by self-propagation high-temperature synthesis (SHS) employing Al and
B₂O₃as initial reactants. The effects of combustion conditions on the characteristics of the powders were discussed. The results show that, Al₂O₃
has an average particle size of 3～4μm , while the size of AlB₁₂ is in the submicron range. The composite powders have an average specific surface of
～1 m²/g. Impurities of B₂O₃ and 9Al₂O₃.2B₂O₃ can be observed at the surface of the products because of the evaporization and condensation of B₂O₃.
By decrease the argon pressure in the reactor, Al₂O₃/AlB₁₂powders of high purity can be obtained. The adiabatic temperature of the reaction 13Al+6B₂O₃=6Al₂O₃+AlB₁₂
obtained from thermodynamic calculations is significantly higher than the measured combustion temperature.

Key words: combustion synthesis, Al₂O₃/AlB₁₂ composite, adiabatic temperature

中图分类号:

TM286

刘永合,殷声,赖和怡. 燃烧条件对自蔓延高温合成Al₂O₃/AlB₁₂复相陶瓷粉体特性的影响[J]. 无机材料学报.

LIU Yong-He,YIN Sheng,LAI He-Yi. Effects of Combustion Conditions on the Characteristics of Al₂O₃/AlB₁₂ Composite Powders Produced by Self-Propagation High-Temperature Synthesis[J]. Journal of Inorganic Materials.

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燃烧条件对自蔓延高温合成Al₂O₃/AlB₁₂复相陶瓷粉体特性的影响

Effects of Combustion Conditions on the Characteristics of Al₂O₃/AlB₁₂ Composite Powders Produced by Self-Propagation High-Temperature Synthesis

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