高岭土表面镀覆Co-P层及其微波吸收性能研究  

Microwave Absorbing Properties of Modified Kaolinite Coated with Co-P by Electroless Plating

作　　者：张含卓[1] 陈昭 魏小亲 欧雪梅[1] 

机构地区：[1]中国矿业大学,江苏徐州221116

出　　处：《稀有金属材料与工程》2017年第8期2244-2248,共5页Rare Metal Materials and Engineering

基　　金：中央高校基本科研业务费(2014QNA16)

摘　　要：选用产于茂名和苏州的天然高岭土为原料,通过改性处理和化学镀工艺制备了高岭土复合物MK/Co-P和SK/Co-P,对比分析其显微结构、磁性和微波吸收性能。结果表明:Co-P镀层均为单相密排六方结构,在MK/Co-P中均匀沉积在高岭土片层表面,Co和P含量(质量分数)分别为36.62%和4.41%。而在SK/Co-P中镀层对高岭土微米级团簇包覆完整,Co和P含量显著下降。与SK/Co-P相比,MK/Co-P的饱和磁化强度和矫顽力较高,介电常数和磁导率大幅上升,其匹配厚度在2.0~3.0 mm的有效吸波频带(RL≤–20 d B)覆盖4.7~8.2 GHz,反射损耗最大值为–27.32 d B,应用前景较好。Kaolinite composites MK/Co-P and SK/Co-P were prepared by pretreatment and electroless deposition of two type of natural kaolinite produced from Maoming and Suzhou, respectively. The microstructures, magnetic properties and microwave absorption abilities were compared. Results indicate that both kaolinite composites contain single phased Co-P coatings with hexagonal-closed-packed structure. In MK/Co-P, Co-P coatings are deposited on the surfaces of kaolinite flakes uniformly, where the contents of cobalt and phosphorus are determined to be 36.62 wt% and 4.41 wt%, respectively. By comparison, kaolinite microclusters are covered completely by Co-P coatings in SK/Co-P and the contents of Co and P are both decreased noticeably. In contrast to SK/Co-P, MK/Co-P shows enhanced saturation magnetization and coercivity together with much improved permittivity and permeability. It presents a maximum reflection loss of –27.32 d B and an effective absorbing bandwidth（reflection loss below –20 d B） covering 4.7-8.2 GHz in the thickness range of 2.0-3.0 mm, which would be suitable for applications in microwave devices.

关 键 词：高岭土 化学镀 Co-P镀层 电磁参数 微波吸收 

分 类 号：TB306[一般工业技术—材料科学与工程]