溶胶-凝胶法应用于Cu粉抗氧化工艺研究

应用钛酸丁酯水解形成二氧化钛溶胶对铜粉表面进行包覆处理，样品的耐腐蚀性通过在5％硫酸溶液中浸泡，然后测定溶液在760nm处的透光率来表征，据此研究了不同加水量、加酸量以及溶胶用量对包覆处理效果的影响。结果表明，钛酸丁酯与水的摩尔比为1：2，H^＋浓度为0．32mol／L，溶胶用量在4％～6％范围内，包覆样品浸泡4h后溶液的透光率为80％以上，而原始样品为15％。应用SEM、EDS、XPS以及XRD对包覆样品进行表征。XPS结果表明，样品表面主要有C、Ti、Sn、O、Cu等元素，其中Ti、Sn元素分别为四价和二价。对空气中放置60天后的包覆样品以及原始粉体的X射线衍射（XRD）检测表明，原始粉体表面有Cu2O存在，而包覆处理Cu粉的图谱中仅出现Cu的特征峰。

Sol-Gel Process for Improving the Oxidation-resistance of Copper Powder

TiO_2 film is formed to clad the surface of the Cu powder by hydrolyzing sol-gel process for improving the oxidation resistance of copper powders. Effects of various water, acid and sol-gel quantity on cladding effects are investigated by measuring transmissivity rate away from 760 nm of the solution under the condition of eroding the samples in 5% H_2SO_4 solution for four hours. The results show that the transimissivity rate of the coat samples at 760 nm is more than 80% with 1 to 2 of Ti(OBu)_4 and H_2O, 0.32 mol/L of H~+ content and 4%~6% TiO_2 sol, while that of initial samples is 15%.SEM, EDS, XPS and XRD are employed to characterize the coated samples. XPS analysis shows that the main elements in the surface of the coated copper podwders are Ti, Sn, C, O and Cu, in which Ti and Sn are in the state of Ti~ +4 and Sn~ +2 , respectively. The XRD analysis for coated copper powder and initial samples after 60 day in air indicates that the advents of Cu_2O in surface of the initial samples are observed, while only Cu can be observed in the coated samples.