Fabrication and characterisation of porous silicon nitride ceramics using Yb2O3 as sintering additive |
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| Affiliation: | 1. Japan Science and Technology Corporation (JST), Synergy Materials Research Center, AIST, Nagoya 463-8687, Japan;2. Synergy Ceramics Laboratory, Fine Ceramics Research Association, Nagoya 463-8687, Japan;3. National Institute of Advanced Industrial Science and Technology (AIST), Shidami Human Science Park, 2268-1, Simo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan;1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi׳an Jiaotong University, Xi׳an 710049, China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi׳an Jiaotong University, Xianning West Road No. 28, Xi׳an 710049, Shaanxi Province, China;3. Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China;3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Porous Si3N4 ceramics were fabricated by liquid-phase sintering with a Yb2O3 sintering additive, and the microstructure and mechanical properties of the ceramics were investigated, as a function of porosity. Low densification was achieved using a lower Yb2O3 additive content. Fibrous β-Si3N4 grains developed in the porous microstructure, and the grain morphology and size were affected by different sintering conditions. A high porosity, ∼40–60%, with β-Si3N4 grain development, was obtained by adjusting the additive content. Superior mechanical properties, as well as strain tolerance, were obtained for porous ceramics with a microstructure of fine, fibrous grains of a bimodal size distribution. |
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