银粉形貌和质量分数对油墨粘度特性和固化膜电阻的影响(英文)  

Effects of Morphology and Mass Fraction of Silver on the Ink Viscosity Characteristics and Resistance of Conductive Film

作　　者：杨初[1] 堵永国[1] 汪晓[2] 秦峻[1] 肖爽[1] 

机构地区：[1]国防科技大学航天科学与工程学院,长沙410073 [2]湖南有色中央研究院有限公司,长沙410073

出　　处：《贵金属》2012年第4期60-67,共8页Precious Metals

基　　金：Hunan nonferrous special major project.Item Designation:2012BAE06B00

摘　　要：分别制备了不同银粉形貌和不同银粉质量分数的导电油墨,采用锥板粘度计测量了油墨粘度随剪切速率的变化曲线,并得到了油墨在120℃固化时固化膜电阻随时间的变化关系。结果表明,导电油墨中片状银粉的片径越大,表现出的粘度越大,而且触变破解指数也越大,具有更好的触变性;在不改变树脂种类和工艺的情况下,银粉质量分数越高,则制备的导电油墨的粘度越大,且具有更大的触变破解指数;在银粉质量分数相同的情况下,片状银粉制备的导电油墨的方阻比球形银粉制备的导电油墨的方阻要低,而且片状银粉的比表面积越大,方阻越小。而片状银粉制备的导电油墨的溶剂释放性比球形银粉制备的导电油墨的溶剂释放性要差些。The conductive inks were prepared with different silver powder morphologies and different silver powder mass fractions. The relation between the ink viscosity and the shear rate was determined with the cone -and - plate viscometer, and the varying curves of square resistance of conductive ink with time were obtained when it was cured at 120℃. The results show that the morphology of silver powder has a great influence on the viscosity of the ink, and the bigger the size of the silver powder, the higher the vis- cosity of the ink. Meanwhile, the big size of the silver powder will be of great benefit to the thixotropy of the ink. The conductive ink has higher viscosity and better thixotropy when the mass fraction of silver powder increases. Under the same condition, the square resistance of the silver conductive ink prepared with flake silver powder is lower than that with spherical silver powder. Meanwhile, the bigger the specific surface area of the flake silver powder, the lower the square resistance. However, the solvent can volatil- ize faster if the silver conductive ink is filled with spherical silver powder instead of flake silver powder.

关 键 词：金属材料 导电浆料 银粉形貌 粘度 触变破解系数 方阻 

分 类 号：TG146.32[一般工业技术—材料科学与工程]