Effect of rare earth oxides addition on the mechanical properties and coloration of silicon nitride ceramics |
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| Affiliation: | 1. Key Laboratory of Advanced Structural Ceramics and Ceramics Matrix Composites, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210. China;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;4. University of Chinese Academy of Sciences, Beijing, 100049, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Department of Mechanical and Automotive Engineering, Zhuhai College of Jilin University, Zhuhai, 519041, China;3. School of Electromechanical Engineering, Guangzhou Panyu Polytechnic, Guangzhou, 511483, China;1. School of Materials Science and Engineering, Harbin Institution of Technology, Harbin, 150001, China;2. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China;3. Institute of Telecommunication Satellite, China Academy of Space Technology, Beijing, 10094, China |
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| Abstract: | The aim of this study was to evaluate the mechanical properties and coloration of silicon nitride ceramics in the presence of RE2O3 (RE = Nd, Eu or Dy). Dense Si3N4 ceramics were prepared by gas pressure sintering at 1800 °C for 2 h. XRD analysis confirmed the complete transformation of α-Si3N4 to β-Si3N4. The fracture toughness and flexure strengths were 11.93 ± 0.56 MPa·m1/2, 667 ± 40.98 MPa with the addition of Eu2O3 (SE). Base on the SEM image, the pull-out, bridging and deflection of large grains were observed and contributed to the increase in mechanical properties. The chromaticity of sintered bodies was measured using a spectrophotometer. The color difference of the ceramics is due to the formation of different color developing compounds according to the EDS. Results showed that high-toughness and colorful Si3N4 ceramics can be prepared using YAG:Ce3+ as sintering additive and RE2O3 as the colorant. |
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| Keywords: | Silicon nitride Fracture toughness Color Rare earth metal oxides |
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