The role of the reaction medium in the self propagating high temperature synthesis of nanosized tantalum powder
The role of the reaction medium in the self propagating high temperature synthesis of nanosized tantalum powder
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DOI：
10.1016/j.combustflame.2003.08.006
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发表时间：
2003-12
影响因子：
4.4
通讯作者：
H. Nersisyan;Jong-Hyeon Lee;S. I. Lee;C. Won
中科院分区：
文献类型：
--
作者：
H. Nersisyan;Jong-Hyeon Lee;S. I. Lee;C. Won
用微型热电偶研究了Ta 2 O 5 + 5 Mg混合物在MgO和NaCl熔融介质中的高温燃烧。研究了改变这两种无机试剂（MgO和NaCl）的量的效果。结果表明，使用MgO作为反应介质产生复合氧化物MgxTayOz作为Ta粉末中的杂质，而在NaCl存在下形成未团聚的单相Ta粉末（粒度为20-90 nm）。形成最终产品的近似机制进行了讨论。测量了Ta_2O_5 + 5 Mg + NaCl混合物燃烧波中的温度分布、放热率分布和转化率分布。导出了燃烧区的尺寸和反应动力学。
The high temperature combustion of the mixture Ta2O5+ 5 Mg has been investigated using a microthermocouple in the medium MgO and molten NaCl. The effect of varying the amounts of these two inorganic agents (MgO and NaCl) was examined. It was shown that using MgO as the reaction medium produces the complex oxide MgxTayOzas an impurity in the Ta powder, whereas unagglomerated single-phase powder (particle size of 20-90 nm) of Ta was formed in the presence of NaCl. The approximate mechanism for forming the final product is discussed. The distributions of temperature, the rate of heat generation and degree of conversion in the combustion wave of the mixture Ta2O5+ 5Mg + NaCl were measured. The sizes of the combustion zones and the kinetics of reaction were derived.