作　　者： ; ; ;

机构地区： 北京建筑工程学院

出　　处： 《制冷学报》 2012年第6期7-11,共5页

摘　　要： 通过在58%浓度工业用溴化锂水溶液中添加纳米微粒及其相应的分散剂,对纳米溴化锂溶液的稳定性及其在高温温度下的烧结特性进行研究。研究结果表明,在纳米溴化锂溶液中分散剂浓度从0.3%变化到0.6%,具有最佳组分值,即:最佳稳定性能值。纳米溶液在160℃温度下,分散剂组分由0.1%增至1.0%,加热过程的24h中,烧结物粒径增长率较大,48h后,所有组分的粒径增长趋于缓慢;在纳米溶液分散剂组分不改变,加热温度由50℃增加到160℃期间,12h过程中,粒径增长速率较快,48h后纳米粒径增长趋势平稳。烧结粒径微观分析可知,分散剂组分从0.1%增加至1.0%,烧结体粒径变小,这说明分散剂组分越浓,烧结体粒径越小,烧结层越密实。因此,需要在改变纳米溴化锂溶液的稳定性和烧结现象之间进行优化组合,并选择耐高温的分散剂。 Based on industrial Lithium Bromide （LiBr） aqueous solution with concentration 58% in weight, both stability and sintering property of the solution added some nano-particles and relevant dispersant were studied. The results show that an optimum composition could be obtained as concentration of dispersant in the solution varies in 0.3%-0.6%. When heating temperature is at 160℃, the diameter of sintering particles increase greatly during the beginning 24h, and enhance slowly after 48h as the concentration of dispersant varies in 0.1%-1.0%. While the concentration of dispersant is unchanged, the diameter of sintering particles increase dramatically during the beginning 12h, and keep smooth variation after 48h as heating temperature changes from 50℃ to 160℃. After analyzing the microcosmic structure of sintering particles, it is found that the diameter of sintering particles decrease as the concentration of dispersant varies from 0.1% to 1.0%. It shows that the stronger the dispersant, the smaller the diameter of sintering particles, and the thicker the sintering layer. Therefore, it should be compromised between the stability of LiBr aqueous solution added nano-particles with relevant dispersant and sintering phenomenon, and the dispersants that can work under high temperature is better to be chosen.

关 键 词： 工程热物理 分散剂 烧结 纳米溴化锂水溶液 稳定性

领　　域： [一般工业技术] [一般工业技术]