Dielectric properties of silicon nitride ceramics produced by free sintering |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Young Researchers and Elite Club, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China;1. Amedica Corporation, 1885 West 2100 South, Salt Lake City, UT 84119, USA;2. Department of Orthopaedic Surgery, University of Missouri, Columbia, MO 65212, USA;3. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;4. Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8126 Kyoto, Japan |
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| Abstract: | The silicon nitride ceramics with a beneficial combination of low dielectric losses and improved physical properties was fabricated by cold isostatic pressing and pressureless sintering. The fine grain microstructure, three-phase composition based on the β-SiAlON, the small amount of the glass phase and relatively small porosity promote a unique combination of a low thermal conductivity 14.51 W m−1 K−1 and low dielectric loss 1.4·10−3. A novel method is proposed to overcome the main drawbacks of the commercial and high-cost technologies. |
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| Keywords: | Silicon nitride Dielectric losses Sintering |
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