Translucent Mg-α-Sialon Ceramics Prepared by Spark Plasma Sintering |
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| Authors: | Yan Xiong Zhengyi Fu Hao Wang Weiming Wang Jinyong Zhang Qingjie Zhang Soo Wohn Lee Koichi Niihara |
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| Affiliation: | State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; Department of Materials Engineering, SunMoon University, Asan, ChungNam 336-708, Korea; Extreme Energy Density Research Institute, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan |
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| Abstract: | The translucent Mg-α-sialon ceramics have been prepared by spark plasma sintering (SPS) α-Si3N4 powder with AlN and MgO as the additives at 1850°C for 5 min. The sample possesses a uniform, dense microstructure under the rapid densification of SPS process. The translucent Mg-α-sialon ceramics achieve the maximum transmittance of 66.4% for the sample of 0.5 mm in thickness in the medium infrared region, which could be attributed to the equiaxed microstructure and few glassy phase confirmed by the observation of transmission electron microscopy. The material also exhibits good mechanical properties of high hardness (21.4±0.3 GPa) and fracture toughness (6.1±0.1 MPa·m1/2). |
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