A novel way to fabricate highly porous fibrous YSZ ceramics with improved thermal and mechanical properties |
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| Authors: | Yanhao Dong Chang-An Wang Jun Zhou Zhanglian Hong |
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| Affiliation: | 1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China;2. Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China;1. North Carolina State University, Department of Materials Science and Engineering, 911 Partner''s Way, EB1 Room 3002, Raleigh, NC 27695, United States;2. RTI International, Center for Materials and Electronic Technologies, PO Box 12194, 3040 Cornwallis Road RTP, NC 27709, United States;3. Nova Southeastern University, Section of Prosthodontics, 3301 College Avenue, Fort Lauderdale, FL 33328, United States;1. Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. LTCS, College of Engineering, Peking University, Beijing 100871, China;1. School of Materials Science and Engineering of Tianjin University, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, China;2. State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin 300072, China |
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| Abstract: | Inspired by nest structure, highly porous fibrous yttria-stabilized zirconia (YSZ) ceramics were fabricated through tert-butyl alcohol (TBA)-based gel-casting process and pressureless sintering by using YSZ fibers as raw material and adding K2SO4 as removable sintering aid. Different sintering temperature and soaking time were investigated to achieve optimal thermal and mechanical properties. The results show that all specimens consist of crystallized t-YSZ phase. Fibers interconnect with good interfacial bonding on junctions. Under higher sintering temperature, porosity drops gradually while compressive strength increases significantly. With prolonged soaking time, there is no obvious change in porosity and compressive strength increases gradually. All specimens have uniformly distributed pores with average size of 30.2 μm and show good structural stability at high temperature. Ultra-low thermal conductivity is achieved and ductile fracture mode with high elongation makes it more applicable in high-temperature thermal insulating applications. |
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