Study on preparation of spherical silver powders with polyvinylpyrrolidone as dispersant
XIE Wei1,2, ZHENG Ya-ya1,2, KUANG Jia-cai3, XU Hua3, DENG Ying-jun3
（1. College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China 2. Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle, College of Hu’nan Province, Changsha 410114, China 3. Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, Hu’nan Province,Changsha 410114, China）
Abstract：The spherical silver powders with uniform particle size were prepared using silver nitrate as raw material, ascorbic acid as reducing agent, polyvinylpyrrolidone (PVP) as dispersant through the method of liquid reduction. The effects of mass ratio of PVP/AgNO3 on the microstructure, crystal structure, particle size distribution and resistivity of spherical silver powders were investigated. Results show that the silver particles tend to be more spherical, the particle size gets smaller and more uniform, and the resistivity of the powder increases, while the crystal structure remains unchanged with the mass ratio of PVP/AgNO3 increasing. The resistivity of silver powder is 367 Ω·mm2/m when the mass ratio of PVP/AgNO3 is 0.6.
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2015, Vol. 25 
