原位反应合成Ag/CuO中氧化铜的热力学计算与分析

Thermodynamic Calculation and Analysis of CuO in Ag/CuO Composites Prepared by In-situ Synthesis

对原位反应合成法制备Ag/CuO复合材料中,与CuO有关的反应进行了热力学计算,并绘制了Gibbs自由能与温度关系图。结果表明,原位反应合成法制备Ag/CuO复合材料中,生成立方CuO有3种方式:一是Cu与O_2直接反应合成立方CuO;二是烧结反应过程中生成部分的Cu_2O与O_2反应合成立方CuO;三是Cu与O_2反应合成单斜CuO后,在烧结时发生相转变得到立方CuO,并得出了这3种方式的合成立方CuO的温度,同时还对原位反应合成过程中的氧分压影响进行计算与分析。此外还通过对CuO与Ag/CuO反应烧结试验后的的XRD图分析,进一步验证了热力学计算的结论。

Thermodynamic of CuO by the in-situ reaction synthesis in Ag/CuO composites was calculated,and the diagram of the Gibbs free energy and temperature was drawn.The results show that there are three ways generating cubic copper oxide：firstly,cubic CuO is synthesized directly by Cu and O2;secondly,cubic CuO is synthesized by O2 and Cu2O which is generated by the process of sintering reaction section;three,cubic CuO is generated by phase transition in sintering after monoclinic CuO is synthesized by Cu and O2.And the synthetic temperature of the three modes was presented.Moreover,the oxygen partial pressure of in-situ synthesis was calculated and analyzed.The XRD diagrams of CuO and Ag/CuO reaction after sintering test was also analyzed.The conclusion of the thermodynamic calculation was further verified.