Fabrication of nanopowders by high energy ball milling and low temperature sintering of Mg₂SiO₄ microwave dielectrics

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• 作者：Lin Cheng^a ; ^{chenglin@stu.snnu.edu.cn} ; Peng Liu^a ; XiaoMing Chen^a ; WenCheng Niu^a ; GuoGuang Yao^a ; Cheng Liu^a ; XiaoGang Zhao^a ; Qian Liu^a ; HuaiWu Zhang^b
• 关键词：Mechanical alloying ; Nanostructured materials ; Ceramics ; X-ray diffraction
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 出版时间：5 February 2012
• 年：2012
• 卷：513
• 期：Complete
• 页码：373-377
• 全文大小：1355 K

文摘

Mg₂SiO₄ nanopowders were prepared from MgO and SiO₂ mixtures by using a high energy ball milling method, combined with subsequent calcination at low temperatures. After milling for 30 h, pure phase Mg₂SiO₄ nanopowders with an average grain size of 147.4 nm were obtained at 850 ¡ãC, 300 ¡ãC lower than that required by a conventional solid state reaction process. Mg₂SiO₄ ceramics sintered at a low temperature of 1075 ¡ãC showed almost full density and excellent microwave dielectric properties (?_r = 7.2, Q ¡Á f = 193,800 GHz, ¦Ó_f = ?8 ppm/¡ãC).