热处理温度对镀钴空心微球镀层晶体结构及电磁性能的影响

Influence of heat treatment temperature on the crystal structure and electromagnetic properties of Co-plated hollow glass microspheres

对采用化学镀方法制得的镀Co空心玻璃微球进行了不同温度的热处理,对其在不同温度热处理下的表面形貌、晶型、电磁参数与吸波性能以及磁性能进行了研究。研究结果发现,随着热处理温度升高,镀层先后出现微区熔融直至较严重的熔融和镀层剥落现象;镀层Co发生由HCP到FCC的晶型转变且转变程度提高。热处理温度对镀Co微球介电常数影响比较显著,对磁导率影响则比较小;在2~18GHz频段,经过800和1000℃热处理的镀Co空心玻璃微球介电常数大幅提高,而磁导率变化不大,电磁波反射率显著降低。镀Co空心玻璃微球矫顽力随热处理温度上升而下降,热处理后镀Co微球磁滞损耗略有下降。可以预测经过800和1000℃热处理的镀Co微球吸波性能会有较大的提高。

Co-plated hollow glass microspheres acquired by electroless plating method were treated at different temperature,then its surface morphology,crystal structure,electromagnetic parameters,absorbing properties and the magnetic properties were studied.The results showed that with the rise of heat treatment temperature,the coatings have been through micro-melting until the more serious melting and coating spalling;HCP to FCC of Co transition occurred in the coating and the extent becomes larger.Heat treat temperature has significant influence on the permittivity of Co-plated microspheres but little influence on its permeability.The permittivity of Co-plated microspheres with 800 and 1000℃ rose by a large scale while the permeability changed little in 2-18GHz frequency band,thus,the reflectivity reduced dramatically.The coercive of Co-plated microspheres becomes smaller with the rise of temperature,and its hysteresis loss decreased slightly after heat treatment.It can be predicted that the absorbing properties of Co-plated microspheres with 800 and 1000℃ heat treatment will be greatly improved.