新型耐湿热镀银镍包覆石墨粉的制备及性能研究。

Novel Silver-Plated Nickel-Coated Graphite Powder with Excellent Heat and Humidity Resistance: Facile Preparation and Performance Investigation.

机构信息

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

出版信息

Molecules. 2022 Jun 22;27(13):4007. doi: 10.3390/molecules27134007.

DOI:10.3390/molecules27134007

PMID:35807253

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9268146/

Abstract

Nickel-coated graphite (Ni/C) powder has many applications in diverse areas such as paint, print ink, adhesive, conductive rubber, and so on. To increase its stability in harsh environmental conditions, the electroless plating of silver film on Ni/C via ascorbic acid was studied. A silver layer with a thickness of 2.5 μm was successfully plated on Ni/C powder's surface with an Ag loading of 44.35 wt.%. Silica gel blended with the Ag/Ni/C powder exhibited much higher conductivity under aging conditions of 85 °C and 85% RH for 1000 h than that with pristine Ni/C powder. Further tests showed that the conductivity of Ag/Ni/C powder remained almost unchanged even in an extremely humid and hot condition for 1000 h. Aging tests were carried out for Ag/Ni/C and Ni/C powders under long-term humid and hot conditions (85 °C, 85% RH), in which Ag/Ni/C samples showed much better electromagnetic shielding performance. Due to the excellent properties and reasonable price, the potential applications of Ag/Ni/C in conductive glue and electromagnetic shielding glue could be expected.

摘要

镍包石墨（Ni/C）粉末在涂料、印刷油墨、粘合剂、导电橡胶等多个领域有广泛的应用。为了提高其在恶劣环境条件下的稳定性，通过抗坏血酸对 Ni/C 进行了化学镀银研究。成功在 Ni/C 粉末表面镀上了 2.5μm 厚的银层，Ag 负载量为 44.35wt%。与原始 Ni/C 粉末相比，混合有 Ag/Ni/C 粉末的硅胶在 85°C 和 85%RH 的老化条件下 1000 小时后表现出更高的导电性。进一步的测试表明，即使在 1000 小时的极潮湿和炎热条件下，Ag/Ni/C 粉末的导电性几乎保持不变。对 Ag/Ni/C 和 Ni/C 粉末进行了长期湿热条件（85°C，85%RH）下的老化测试，Ag/Ni/C 样品表现出更好的电磁屏蔽性能。由于其优异的性能和合理的价格，Ag/Ni/C 在导电胶和电磁屏蔽胶中的潜在应用是可以预期的。