Nano- versus macro-hardness of liquid phase sintered SiC |
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| Affiliation: | 1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia;2. CNR-ISTEC, Research Institute for Ceramics Technology, Faenza, Italy;3. Erich Schmid Institute for Materials Research, Austrian Academy of Sciences, Leoben, Austria;4. Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of China;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea;1. CEA, IRAMIS, UMR-3685 NIMBE, F 91191 Gif-sur-Yvette, France;2. MATEIS, UMR-5510 INSA de Lyon, Université Claude Bernard Lyon 1, CNRS, 7 av. Jean Capelle, 69621 Villeurbanne, France;3. ICB, UMR-6303 CNRS, Université Bourgogne Franche-Comté, 9 av. Alain Savary, BP 47 870, 21078 Dijon Cedex, France;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. Engineering Ceramics Research Department, Korea Institute of Materials Sciences, Changwon, Gyeongnam, Republic of Korea;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong, 528000, China;3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150080, China |
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| Abstract: | Silicon carbide polycrystalline materials were prepared by liquid phase sintering. Different rare-earth oxides (Y2O3, Yb2O3, Sm2O3) and AlN were used as sintering additives. The final microstructure consists of core–rim structure owing to the incorporation of AlN into the rim of SiC grains by solid solution. Nano- versus macro-hardness of polycrystalline SiC materials were investigated in more details. The nano-hardness of SiC grains was in the range of 32–34 GPa and it depends on the chemical compositions of grains. The harness followed the core–rim chemistry of grains, showing lower values for the rim consisting of SiC–AlN solid solution. The comparison of nano- and macro-hardness showed that nano-hardness is significantly higher, generally by 5–7 GPa. The macro-hardness of tested samples had a larger scatter due to the influence of several factors: hardness of grains (nano-hardness), indentation size effect (ISE), microstructure, porosity, and grain boundary phase. The influence of grain boundary phase on macro-hardness is also discussed. |
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