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采用均匀沉淀和高温热分解相结合的方法制备了纳米银粉体,分析了纳米银粉体形成机理,研究了初始浓度、烧结温度和时间对纳米银粉体粒径和形貌的影响;采用X射线衍射仪、扫描电子显微镜表征了纳米银粉体结构、组成、大小和形貌。结果表明,硝酸银初始浓度0.05 mol/L、烧结温度300℃、烧结2 h,以尿素为pH控制剂,不添加任何其他分散剂条件下可得到分散性好、颗粒均匀,粒径50 nm的球形粉体。
The nano-silver powder was prepared by a combination of uniform precipitation and high-temperature pyrolysis. The formation mechanism of nano-silver powder was analyzed. The effects of initial concentration, sintering temperature and time on the particle size and morphology of nano-silver powder were studied. X-ray diffraction and scanning electron microscopy were used to characterize the structure, composition, size and morphology of nano-silver powder. The results showed that the initial concentration of silver nitrate was 0.05 mol / L, the sintering temperature was 300 ℃, and the sintering time was 2 h. Urea was used as pH control agent. No dispersant was added to obtain good dispersibility, uniform particle size and particle size of 50 nm Spherical powder.