Ag/CuO复合材料反应合成热力学分析

Thermodynamics Analysis for Ag/CuO Composites by Reactive Synthesis

摘要:

通过对Ag/CuO复合材料在反应合成制备中各元素、亚金属氧化物与1 mol氧气反应生成金属氧化物的标准自由焓的热力学计算，绘制了标准自由焓与温度关系图；考虑到氧压力对反应进行有重要影响，在标准自由焓与温度关系图中绘制了氧压力随温度变化的直线。结果表明：Ag与O2，Cu2O与O2的反应是一种可逆反应，其发生可逆转变的温度分别为586.818，667.663 K；氧的压力对金属氧化物的分解有重要影响：压力越低，金属氧化物越易分解；并通过热力学分析结果，最终确定了Ag/CuO复合材料反应合成烧结工艺。

Abstract:

Gibbs’ function of metal oxide from the reaction between elements as well as sub-metal oxides and 1 mol oxygen in Ag/CuO composites by reactive synthesis was calculated thermodynamically; through the calculation, the relation diagram was drawn for Gibbs’ function and temperature. Considering oxygen pressure influencing the reaction greatly, the oxygen pressure line with temperature change was also drawn in the diagram above. Results show that the reactions between Ag and O2, and Cu2O and O2 are reversible, whose temperature for reversible transition are 586.818 K and 667.663 K, respectively. The oxygen pressure is important for decomposition of metal oxides: the lower the oxygen pressure is, the more easily the oxides decompose. The reactive synthesis sintering technology of Ag/CuO composite was determined by thermodynamic analysis.