粉煤灰空心微珠的改性及其吸波特性  

Microwave absorption characteristics of surface treated fly-ash cenosphere particles

作　　者：毛倩瑾[1] 于彩霞[1] 葛凯勇[1] 周美玲[1] 

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：《清华大学学报（自然科学版）》2005年第12期1672-1675,共4页Journal of Tsinghua University(Science and Technology)

基　　金：北京市自然科学基金重点项目(2991001)

摘　　要：利用电厂废弃物粉煤灰空心微珠,对其进行表面金属化处理制备了一种低密度的新型微波吸收材料.利用简单、低成本的置换沉积铜法新工艺,进行表面金属化处理.该工艺具有明显的优点: 其反应时间缩短到1.5 h;处理工艺由6步简化到3步;无须使用贵金属钯等活化,成本大大降低.研究了改性的粉煤灰空心微珠涂层在8～18 GHz频段内的电磁波吸收性能,及金属沉积时间对吸波性能的影响.结果表明: 空心微珠经过金属化改性后可以获得较佳的吸波性能,制备的涂层,厚度为0.7～0.8 mm, 在8～18 GHz频段,电磁波反射率最低达到-16 dB, 小于-10 dB的吸收带宽大于 2 GHz.Power station fly-ash cenosphere particles were plated with metal to prepare a light weight microwave absorbing material. The plating used an economical copper replacement deposition method that differs from general electrodeless-plating pretreatment. The reaction time was reduced to 1.5 h, with the process reduced to three steps with much lower cost. The microwave absorption characteristic of the product depends on the metal deposition time. The results show that the fly-ash cenosphere particles have good microwave absorption characteristics after the metal deposition. Coatings with thicknesses of 0. 7 - 0.8 mm gave a maximum microwave absorption of - 16 dB with a band width of larger than 2 GHz. The absorption was less than - 10dB for frequencies of 8 - 18 GHz.

关 键 词：粉煤灰空心微珠 表面改性 化学镀 吸波涂层 

分 类 号：X705[环境科学与工程—环境工程] TB34[一般工业技术—材料科学与工程]