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Characterization of porous silicon nitride ceramics by pressureless sintering using fly ash cenosphere as a pore-forming agent
Authors:Yingfeng Shao  Dechang Jia  Boyang Liu
Affiliation:1. Dipartimento di Ingegneria Industriale, University of Padova, Via Marzolo 9, 35131 Padova, Italy;2. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;3. Berzelii Center EXSELENT on Porous Materials, Stockholm University, S-106 91 Stockholm, Sweden;4. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16801, United States;1. School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022, China;3. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, China;4. Shandong Industrial Ceramics Research & Design Institute Co., Ltd, Zibo, 255000, China;5. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, 710072, China;6. College of Field Engineering, PLA Army Engineering University, Nanjing, 210007, China;1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China;1. Department of Civil Engineering, Shiraz University, Shiraz, Iran;2. Department of Civil and Environmental Engineering, Imperial College London, UK
Abstract:A new method for fabricating porous silicon nitride ceramics has been developed by using fly ash cenosphere (FAC) with mean diameter of 87 μm as a pore-forming agent. Sintering was carried out at 1780 °C for 2 h under a nitrogen atmosphere. FAC can also act as a sintering aid besides a pore-forming agent. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that YSiO2N forms instead of Y2Si3O3N4 when FAC is incorporated. Microstructural analysis revealed that large spherical cavities are scattered in a relative dense matrix. Porous Si3N4 ceramics with density of 2.17–2.30 g/cm3, Young’s modulus of 141–150 GPa and strength of 180–320 MPa were obtained by changing the FAC content.
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