Facile synthesis of Co/SC microwave absorbents by recycling coal hydrogasification residue
Facile synthesis of Co/SC microwave absorbents by recycling coal hydrogasification residue
复制标题
回收煤加氢残渣简易合成Co/SC微波吸收剂
DOI：
10.1016/j.matlet.2021.131168
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发表时间：
2021-11
影响因子：
3
通讯作者：
Rong Zhang
中科院分区：
文献类型：
--
作者：
Fei Gao;Yuyan Li;Lutao Mao;Yake Wang;Baoshun Zhu;Liping Liang;Guomin Li;Rong Zhang
以煤加氢气化残渣半焦为原料，采用一种简便的方法制备了半焦基微波吸收复合材料。这主要涉及将硝酸钴的乙醇溶液负载到SC上，然后进行原位碳热还原。结果表明，在700 ℃的碳热处理温度下，可以得到Co/SC复合材料（CoSC 700）。CoSC 700复合材料表现出优异的性能，在涂层厚度为2 mm时，最小反射损耗值为− 40.1 dB，有效吸收带宽为5.0 GHz。这是良好的阻抗匹配和强的本征耗散能力的组合效果，这得益于Co对输入阻抗的有效调节以及石墨碳和SC-Co界面效应引起的强传导和界面极化弛豫损耗。
A coal hydrogasification residue, semi-coke (SC), was recycled to prepare SC-based composites for microwave absorption by a facile method. This mainly involved loading an ethanol solution of cobalt nitrate onto SC and then conducting in-situ carbothermal reduction. The results showed that, a Co/SC composite could be obtained at a carbothermal temperature of 700 ℃ (denoted by CoSC700). The CoSC700 composite exhibited excellent performance with a minimum reflection loss value of − 40.1 dB and an effective absorption bandwidth of 5.0 GHz at a coating thickness of 2 mm. This is the combined effect of good impedance matching and strong intrinsic dissipation capacity, which benefit from the effective adjustment of input impedance by Co as well as strong conduction and interfacial polarization relaxation losses caused by the effects of graphite carbon and SC-Co interfaces.
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