Parametric effects of low-temperature combustion synthesis of alumina
Parametric effects of low-temperature combustion synthesis of alumina
复制标题
氧化铝低温燃烧合成的参数效应
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Kuan Huang
中科院分区：
文献类型：
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作者：
Chien;Kuan Huang
以合成氧化铝颗粒的粒度为性能指标，研究了反应条件对硝酸铝与燃烧燃料混合物低温燃烧合成氧化铝颗粒的影响。首先，当尿素作为燃烧燃料时，它比碳肼作为燃料时产生更高的燃烧温度和更大的颗粒尺寸。接下来，在空气中燃烧产生一个火焰，通过反应物混合物传播，而不是在氮气中进行燃烧时，整个反应物同时破裂的火焰。在氮气中得到的产物的粒度比在空气中得到的产物的粒度小40%。加热温度过低会导致氧化铝颗粒尺寸增大，但加热温度过低会导致氧化铝颗粒尺寸的增大。稀释剂、过量燃料和气体释放剂的添加减小了颗粒尺寸。搅拌速度的提高也减小了颗粒的尺寸。其次，如果反应物密度(反应物混合物在反应容器中的数量)低于一定的阈值，则燃烧不能点燃。随着反应物密度的增加，燃烧时间和燃烧温度同时降低，颗粒尺寸减小。最后，建立了气液反应模型并进行了求解，研究了燃烧参数的阈值。
The influences of parameters on the low-temperature combustion synthesis of alumina particles from reactant mixture of aluminum nitrate and combustion fuel were studied using the particle size of as-synthesized alumina particles as a performance index. First, when urea was used as combustion fuel, it produced a higher combustion temperature and a larger particle size than the case when carbohydrazide was the fuel. Next, the combustion in air yielded a flame propagating through the reactant mixture, in contrast to a flame simultaneously ruptured from the entire reactant when the combustion was conducted in nitrogen. The particle size of the product obtained in nitrogen was 40% smaller than that obtained in air. Increasing the heating temperature could increase the alumina particle size due to the sintering effect, while combustion failed if the heating temperature was too small. The addition of diluent, excess fuel, and gas-releasing agents reduced the particle size. The increase of stirring speed also reduced the particle size. Next, if the reactant density (the amount of reactant mixture in the reacting container) was below a certain threshold value, the combustion failed to ignite. Increasing the reactant density was found to reduce the particle size due to the simultaneous reduction of combustion time and temperature. Finally, a liquid–gas reaction model was proposed and solved to study the threshold of combustion parameters.