A nitride whisker template for growth of mullite in SiC reticulated porous ceramics |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;3. Technical University Bergakademie Freiberg, Institute for Ceramic, Glass- and Construction Materials, Agricolastraße 17, 09596 Freiberg, Germany;1. Nonoxide Ceramics and Composites Division, Central Glass and Ceramic Research Institute, CSIR, Kolkata 700032, West Bengal, India;2. Course of Chemical Engineering, University of Ribeirão Preto (UNAERP), 14096900 Ribeirão Preto, São Paulo, Brazil;1. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan University, Haikou 570228, China;2. College of Physics and Electronic Information, Tianjin Normal University, Tianjin 300387, China;3. State Key Laboratory of New Ceramics & Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. State key laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;2. Department of Chemical Engineering, College of Environment Science and Engineering, Chang’an University, Xi′an 710054, China;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China |
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| Abstract: | Silicon carbide reticulated porous ceramics (SiC RPCs) were fabricated by polymer replica technique. The effects of nitride whisker template on the growth of mullite, the strut structure and mechanical properties of SiC RPCs were investigated. Prepolyurethane (PU) open-cell sponge was first coated by SiC slurry consisting of SiC, reactive Al2O3, microsilica and Si powder, then it was nitridized at 1400 °C in a flowing N2 atmosphere to prepare SiC preforms. Subsequently, these preforms were treated by vacuum infiltration of alumina slurry and fired at 1450 °C in air. The results showed that Si2N2O whiskers grew on the surface and in the matrix of SiC preforms after nitridation. The diameter of struts in SiC RPCs increased after vacuum infiltration process because alumina slurry was easily adhered by the surface nitride whiskers. In addition, such whiskers inside the strut of SiC preforms acted as the template to promote the growth of column-liked mullite in SiC RPCs. The mechanical properties and thermal shock resistance of SiC RPCs were greatly improved due to the special interfacial characteristics of multi-layered struts as well as better interlocked column-liked mullite in SiC skeleton. |
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| Keywords: | SiC reticulated porous ceramics Nitride whisker template Column-liked mullite Mechanical properties |
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