摘要
采用热重－差热法（ＴＧ－ＤＴＡ）测定了不同的还原剂与分散剂，还原温度和烘干处理以及加工时间条件下所得银粉在醋酸乙酯溶液中吸附乙基纤维素后，于程序升温脱附（ＴＰＤ）时的脱附活化能及吸附量。结合在低温（约７７Ｋ）下进行氮气吸附及在１３０℃脱附的气相色谱测定，给出了改变还原剂、分散剂以及还原温度时，所得银粉末表面分维相对标定值的变化规律，为银粉末生产工艺条件控制提供依据。
TG-DTA technique was used to determine the adsorption capacity and the desorption activation energy of various silver powders after theadsorption of ethylcellulose in solution of ethyl acetate under temperature programmed desorption(TPD)condition. The silver powder was made from Ag_2CO_3 or AgNO_3 with different reducers and dispersing agents,at different reduction and drying temperatures, or by rolling process for different time.The change pattern of relativc calibrated quantity of the fractal on silver powders was obtained by combinating the results of TG-DTA with the adsorption capacity of nitrogen determined by gas chromatograph(GC). Investigated results provide the direct basis for controlling various technolo-gical conditions in the production of micro-sized silver powders.
出处
《贵金属》
CAS
CSCD
北大核心
1994年第3期17-24,共8页
Precious Metals
关键词
银
金属粉末
表面性质
Silver, Metal powder,Surface property
