High performance porous silicon nitrides |
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| Affiliation: | 1. Synergy Ceramics Laboratory, Fine Ceramics Research Association, Nagoya 463-8687, Japan;2. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8687, Japan;1. Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK;2. WMG, University of Warwick, Coventry CV4 7AL, UK;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany;2. Central Facility for Electron Microscopy (GFE), RWTH Aachen University, 52074, Aachen, Germany;3. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Jülich Research Centre, Jülich 52425, Germany;1. Nuclear Power Institute of China, Science and Technology on Reactor System Design Technology Laboratory, Chengdu 610200, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structures (JRI-AMAS), School of Materials Science and Engineering, Northwestern Polytechnical University, 710072, Xi''an, Shaanxi, PR China;2. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, United Kingdom;3. College of Urban Construction, Nanjing Tech University, 211816, Nanjing, Jiangsu, PR China;4. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518057, PR China;5. Institute of High Pressure Physics of the Polish Academy of Sciences, ul. Sokolowska 29/37, 01-142 Warsaw, Poland;6. School of Electronics and Information, Northwestern Polytechnical University, 710072, Xi''an, Shaanxi, PR China |
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| Abstract: | In structural materials, pores are generally believed to deteriorate the mechanical reliability. This study, however, demonstrates pores can cause improved or unique performance when the porous microstructure is carefully controlled. The first example is a silicon nitride of 14% porosity fabricated by tape-castng whiskers. This material, where the characteristic fibrous grains were aligned uniaxially, shows a high fracture strength in excess of 1 GPa as well as high damage tolerance. The fracture energy obtained by a chevron-noteched beam technique was about seven times larger than that of dense silicon nitride, which was primarily attributable to grain “pull-out” mechanism enhanced by the pores. The other example was a silicon nitride of 24% porosity, fabricated by sinter forging technique which exhibited excellent strain tolerance. |
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