镀银羰基镍粉的制备及其性能研究  

Preparation and Performance of Silver-coated Carbonyl Nickel Powder

作　　者：肖伟民 雷永平[1] 夏志东[1] XIAO Wei-min;LEI Yong- ping;XIA Zhi-dong(Key Laboratory of Advanced Functional Materials,Ministry of Education,School of Materials Science and Engineering,Beijing University of Technology,Beijing 100022,China)

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100022

出　　处：《矿冶工程》2018年第3期140-142,147,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51275006)

摘　　要：利用化学镀法制备镀银羰基镍粉,并以此粉体为导电填料制备了电磁屏蔽材料,优选了羰基镍粉/硝酸银配比参数。采用扫描电镜对该粉体进行了表征,并分析了材料的导电、电磁屏蔽与力学性能。结果表明,镀银羰基镍粉的导电性能及其屏蔽材料的电磁屏蔽效能均比未镀银时提升1倍以上,并随羰基镍粉/硝酸银摩尔比增加,表现出先增强后减弱的趋势。这一变化趋势与其镀银层微观结构有关:当羰基镍粉/硝酸银摩尔比达到0.2时,羰基镍粉表面形成了致密的镀银颗粒;而当摩尔比达到0.3时,粉体表面的镀银颗粒逐渐粗大化。镀银配比变化对屏蔽材料力学性能影响不大。A kind of silver-coated carbonyl nickel powder was prepared by using electroless plating method,which was then taken as the conductive filler for preparation of electromagnetic shielding material,and mole ratio of carbonyl nickel powder/silver nitrate was also optimized. Furthermore,the powder was characterized by means of scanning electron microscope and its conductivity,electromagnetic shielding effectiveness and mechanical properties were all analyzed.Results showed that both conductivity of silver-coated carbonyl nickel powder and electromagnetic shielding effectiveness of the prepared shielding material more than doubled compared to that before coating,and both showed a decline trend after an initial rise with the increasing of the mole ratio of carbonyl nickel powder/silver nitrate. It is concluded that such variation trend has something to do with the microstructure of silver coating layer. A compact layer of silver-coated grains were formed on the surface of carbonyl nickel powder when the mole ratio was 0. 2,and the grains grew and became coarser when the mole ratio reached 0. 3. However,the variation in the mole ratio of carbonyl nickel powder/silver nitrate had little impact on the mechanical properties of shielding materials.

关 键 词：羰基镍粉 镀银 电磁屏蔽 化学镀 吸波材料 

分 类 号：TB34[一般工业技术—材料科学与工程]