Preparation of Electromagnetic wave absorber Barium Ferrites for Electromagnetic Environment by liquid State Reaction

液态反应制备电磁环境用电磁波吸收剂钡铁氧体

• 批准号: 12450269
• 负责人: YOSHIO Tetsuo
• 金额: $ 9.54万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450269/
• 关键词: electromagnetic wave obstacle; glass ceramic method; Y-type Ba-ferrite; electromagnetic wave absorber; solid solution

In the present study, we tried the synthesis of Y-type Ba-hexaferrite expected as an electromagnetic wave absorber by the glass ceramic method. The results are summarized as follows.The glasses with composition of 0.1MO[xB_2O_3・yBaO・(1-x-y)Fe_2O_3] were prepared and the precipitation process of Y-type Ba-hexaferrite from the glass matrix was investigated. Y-type Ba-hexaferrite particles were precipitated by heating the glass at temperatures between 820℃ and 1100℃. Based on these results, hexagonal platelets of Y-type Ba-hexaferrite with fairly uniform dimension were obtained as precipitates from the glass matrix by leaching with a dilute HCl solution. The low-temperature formation of Y-type Ba-hexafcrrite was due to a reaction between M-type Ba-ferrite and liquid phase. Substitutional solid solutions of Y-type Ba-hexaferrite (Ba_2Zn_<2-x>Co_xFe_<12>O_<22>) were obtained in all composition range. These Y-type Ba-hexaferrite solid solutions showed electromagnetic absorption spectra at frequency range of 8 to 9 GHz.

在本研究中，我们尝试用玻璃陶瓷法合成有望作为电磁波吸收剂的y型钡六铁氧体。结果总结如下：制备了组成为0.1MO[xB_2O_3·yBaO·（1-x-y）Fe_2O_3]的玻璃，研究了从玻璃基体中析出y型ba -六铁素体的过程。在820 ~ 1100℃的温度下对玻璃进行加热，析出y型钡六铁素体颗粒。在此基础上，用稀盐酸溶液从玻璃基体中浸出了尺寸相当均匀的y型钡六铁素体六方晶片。y型钡铁氧体是由m型钡铁氧体与液相反应形成的。y型钡六铁素体（Ba_2Zn_<2-x>Co_xFe_<12>O_<22>）的取代固溶体在所有组成范围内均得到。这些y型钡六铁氧体固溶体在8 ~ 9 GHz频率范围内显示出电磁吸收光谱。

项目成果

中西真: "プレセラミックス法によるN-Znフェライト/Sic系複合焼結体の作製と電磁波吸収特性"粉体および粉末冶金. 47巻・8号. 927-930 (2000)

Makoto Nakanishi：“陶瓷前体法制备N-Zn铁氧体/SiC复合烧结体及其电磁波吸收性能”《粉末与粉末冶金》，第47卷，第8期。927-930（2000）。

M.Nagae: "Microstructure of Molybdenum Nitride Layer Formed by Nitriding of Molybdenum Metal"Journal of the American Ceramic Society. (in press).

M.Nagae：“通过钼金属氮化形成的氮化钼层的微观结构”美国陶瓷学会杂志。