Preparation of the micro-size flake silver powders by using a micro-jet reactor

Green Processing and Synthesis

卷:11

Ju Shaohua¹  Xu Lei¹  Wan Xiaoxi¹  Li Jun¹  Li Na¹  Liu Jianhua¹  Tian Shihong¹  Wang Qin² 

[1] Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China;

[2] Kunming Yinke Electronic Materials Co., LTD, Kunming, Yunnan 650114, China;

关键词: micro-jet reactor;    flake silver powder;    micro-size;    sulfuric acid;    lauric acid;   

DOI  :  10.1515/gps-2022-0040

来源: DOAJ

【 摘 要 】

The micro-size flake silver powders were prepared through wet-chemical reduction method by using a micro-jet reactor. Herein ascorbic acid was used as a reducing agent, and sulfuric acid was used as a stabilizer. And the lauric acid was used as a dispersing agent to prevent particles’ agglomeration. The micro-jet reactor collides the two solutions together and uniformly mixes outside the reactor, to avoid the problem of clogging in the microchannel. The effects of dispersant addition and micro-jet flow rate on the morphology, particle size, and other parameters of silver powder is investigated in the present work. Interestingly, the addition of dispersant agent and stabilizer have a significant impact on the morphology and parameter of the silver particles. Under the conditions of micro-jet flow rate of 50 mL·min−1, sulfuric acid addition amount of 2%, and lauric acid addition amount of 0.8% by the weight of silver nitrate, a kind of flake silver powders with 4.40–4.70 μm can be prepared. The volume resistivity of the silver paste prepared from the obtained flake silver powders is in the range of 1.4–1.6 × 10−4 Ω·cm−1, which meets the application test requirements of conductive silver paste.

【 授权许可】

Unknown