Fabrication of lightweight ZrO2 fiberboards using hollow ZrO2 fibers |
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| Affiliation: | 1. University of Belgrade, Vin?a Institute of Nuclear Sciences, Mike Petrovi?a Alasa 12-14, 11001, Belgrade, Serbia;2. University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia;1. Department of Mechanical Engineering, GMIT, Bharathinagara, Mandya 571422, Karnataka, India;2. Department of Mechanical Engineering, VVIET, Mysore , Karnataka, India;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. National Key Laboratory of Science and Technology on Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;3. Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environmental, Beijing Institute of Technology, Beijing 100081, China;4. School of Chemistry and Chemical Engineering, Queen''s University, Belfast, Northern Ireland BT9 5AG, United Kingdom |
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| Abstract: | ZrO2 fiberboards with ultra-low densities (0.34–0.40 g/cm3) were fabricated using biomorphic ZrO2 hollow fibers, which have a lower density and better thermal insulation than traditional ZrO2 solid fibers. The effects of sol binder content, sintering temperature, and proportion of solid fibers on the density, microstructure, compressive strength, linear shrinkage, and thermal conductivity of lightweight ZrO2 fiberboards were investigated. The results showed that the hollow features of biomorphic ZrO2 fibers were successfully maintained after they were made into ZrO2 fiberboards, which made them less dense and thermally conductive. The best conditions were found to be a sol binder content of 30 vol%, sintering temperature of 1400 °C, and 20 wt% sintered solid fibers to balance thermal insulation and compressive strength. The results show that the density and thermal conductivity of lightweight ZrO2 fiberboard gives it obvious advantages as a heat-insulating ceramic. Specifically, when the sintering temperature was 1400 °C, the sample had an ultra-low density of 0.34–0.40 g/cm3, a thermal conductivity of 0.101–0.116 W/(m·K) (at 500 °C), a compressive strength of 0.05–0.24 MPa, and a linear shrinkage of 9.4–13%. |
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| Keywords: | Lightweight ceramics Porous ceramic |
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