On the potential of porous ZrP2O7 ceramics for thermal insulating and wave-transmitting applications at high temperatures |
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| Affiliation: | 1. School of Engineering and Technology, China University of Geosciences, Beijing, 100083, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, No. 1 South Dahongmen Road, Beijing, 100076, China;1. School of Materials Science & Engineering, Chonnam National University, Gwang-Ju 500-757, Republic of Korea;2. Department of Ceramic Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology (Wuhan University of Science and Technology), PR China;1. School of Chemical Engineering & Environment, Minnan Normal University, Zhangzhou, Fujian 363000, PR China;2. Department of Physics, Beihang University, Beijing 100191, PR China;1. School of Engineering and Technology, China University of Geosciences, Beijing, 100083, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, No. 1 South Dahongmen Road, Beijing, 100076, China;1. Universidad del País Vasco (UPV/EHU), Facultad de Ciencia y Tecnología, Departamento de Mineralogía y Petrología, Barrio Sarriena S/N, 48940 Leioa, Vizcaya, Spain;2. BCMaterials (Basque Centre for Materials, Applications & Nanostructures), Technological Park of Zamudio, Camino de Ibaizabal, Bndg. 500-1st, 48160 Derio, Spain;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, 430081 Wuhan, PR China |
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| Abstract: | Sintering at high temperature is a serious problem for porous thermal insulating ceramics. To search for sintering-resistant ceramics, ZrP2O7 is selected as the backbone material and porous ZrP2O7 ceramics with 40?60 vol% porosities and strength of 3?14 MPa are fabricated. The volume shrinkage of the 60 vol% porosity ZrP2O7 is only 1.4 % when heated at 1773 K for 6 h and the thermal conductivity, which is as low as 0.18 W m-1 K-1, keeps almost unchanged. The dielectric constants are stable in the frequency range of 7?19 GHz when the temperature increases from 298 K to 1273 K. As the porosity increases from 44 % to 60 %, the dielectric constant at 19 GHz and 1273 K decreases from 3.4 to 2.5. Good sintering-resistance, ultra-low thermal conductivity and low dielectric constant at high temperatures make porous ZrP2O7 suitable for applications as thermal insulating and wave-transmitting materials at high temperatures. |
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| Keywords: | Thermal insulating material Sintering resistance Low thermal conductivity Low dielectric constant |
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