Microstructure and properties of BN/Si3N4 composites with addition of microwave synthesized Y2O3-MgO nanopowders |
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| Authors: | Yujun Zhao Yueyue Wang Haifeng Zhou Xiaoli Guan |
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| Affiliation: | 1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, College of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, PR China;2. Key Laboratory for liquid-solid Structural Evolution ＆ Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, PR China;3. Laiwu Advanced Ceramic Technology Co., Ltd, Laiwu, Shandong 250353, PR China |
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| Abstract: | Y2O3-MgO nanocomposite powder was synthesized by a microwave technique and doped into gas-pressure sintered BN/Si3N4 composites to acquire a highly wave-transparent material that could be utilized in spacecrafts. The XRD and SEM analyses indicated that the main phases were rod-like β-Si3N4 particles and MgSiO3. In this case, a BN/Si3N4 ceramic with 8?wt% Y2O3-MgO nanopowder displayed a density of 2.5?g/cm3. The permittivity and transmission efficiency were approximately 4.6% and 71.4%, respectively, at frequencies of 8.2–12.4?GHz, which achieved the best overall wave-transparent performance. The porosity of the material in combination with the inclusion of the boron nitride component creates a synergistic effect that appears to contribute to wave-transparent efficiency. |
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| Keywords: | Nanopowders Dielectric properties Wave-transparent mechanisms |
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