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Preparation of micro-nano hollow multiphase ceramic microspheres containing MnFe_2O_4 absorbent by self-reactive quenching method
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作者 Hong-Fei Lou Jian-Jiang Wang +2 位作者 Zhi-Ning Zhao Xu-Dong Cai Yong-Shen Hou 《Rare Metals》 SCIE EI CAS CSCD 2013年第6期592-598,共7页
Fe–Fe2O3–MnO2–sucrose–epoxy resin and O2 as reaction system and feed gas,separately,were used to prepare micro-nano hollow multiphase ceramic microspheres containing MnFe2O4absorbent by self-reactive quenching met... Fe–Fe2O3–MnO2–sucrose–epoxy resin and O2 as reaction system and feed gas,separately,were used to prepare micro-nano hollow multiphase ceramic microspheres containing MnFe2O4absorbent by self-reactive quenching method which is integrated with flame jet,selfpropagating high-temperature synthesis(SHS),and rapidly solidification.The morphologies and phase compositions of hollow microspheres were studied by scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),and energy dispersive spectroscopy.The results show that the quenching products are regular spherical substantially with hollow structure,particle size is between few hundreds nanometers and 5 lm.Phase compositions are diphase of Fe3O4,Mn3O4,and MnFe2O4,and the spinel soft magnetic ferrite MnFe2O4 with microwave magnetic properties is in majority.Collisions with each other,burst as well as‘‘refinement’’of agglomerate powders in flame field may be the main reasons for the formation of micro-nano hollow multiphase ceramic microspheres containing MnFeOabsorbent. 展开更多
关键词 Self-reactive quenching method Micro-nano hollow multiphase ceramic microspheres Collisions and burst Refinement
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Preparation of hollow ceramic microspheres absorbent based on self-reactive quenching technology
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作者 Jian-Jiang Wang Hong-Fei Lou +1 位作者 Jin-Hua Wen Xu-Dong Cai 《Rare Metals》 SCIE EI CAS CSCD 2015年第5期344-350,共7页
A1 + BaO2 + Fe2O3 + sucrose and O2 as reaction system and feeding gas, respectively, are used to prepare hollow multiphase ceramic microspheres (HMCMs) absorbent based on self-reactive quenching technology. The m... A1 + BaO2 + Fe2O3 + sucrose and O2 as reaction system and feeding gas, respectively, are used to prepare hollow multiphase ceramic microspheres (HMCMs) absorbent based on self-reactive quenching technology. The morphologies, particle size distribution, hollow structure and phase compositions were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and size analysis. The results show that the quenching products possess high sphere-forming rate, and most of them are hollow structures. Owing to the self-burst, the particle size is between 40 and 70 μm. The phase compositions contain Al2O3, Fe3O4, Fe2O3, Ba2Fe14O22, BaO2 and BaFe4O7. The microwave absorbing tests show that the lowest reflectivity of HMCMs is -19 dB. The frequency bands less than -10 dB are from 13.0 to 15.8 GHz. The reasons for HMCMs possessing good microwave absorbing properties may be their magnetic and electrical properties as well as special hollow structure. 展开更多
关键词 Self-reactive quenching technology hollow multiphase ceramic microspheres Microwave absorbing properties
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