Zirconia fibrous ceramics with high porosity (porosity=70-90%) were fabricated and investigated for high-temperature thermal protection applications. Two types of zirconia fibers, tetragonal and cubic phases, were compared. The results showed that the ceramics made of cubic-phase fibers had lower room-temperature thermal conductivity and lower mechanical strength. In addition, the effects of fiber diameter on the properties were also studied. Using the fibers with smaller diameter, the sample's thermal conductivity decreased, but the compressive strength also decreased slightly. It was found that the ceramics' room-temperature thermal conductivity and mechanical strengths varied with porosity linearly or exponentially, respectively. The ceramics' thermal expansion and thermal capacity in the range of RT~900 were measured. The high ℃ ℃ ℃ ℃ -temperature insulation performance was evaluated by back temperature tests. Finally, the porous ceramics were impregnated with aerogels. The room-temperature as well as high-temperature thermal conductivities both decreased. Therefore, the zirconia fibrous ceramics is a promising candidate for high-temperature insulation applications. Nomenclature ρ = density λ RT = room-temperature thermal conductivity λ HT = high-temperature thermal conductivity σ c = compressive strength σ t = tensile strength α = average linear thermal expansion C p = average thermal capability
Glass curtain wall has been widely employed in buildings. These glazing may easily crack and even fallout when subjected to a fire, which would influence the structural integrity and is especially vital for the interactive-external tridimensional fire development. Low-E glazing is extensively used which may bring energy conservation with potential fire risk. Here, low-E and float glazing were heated by a radiant source under various heating rates. Numerical simulation concerning the heat transfer was conducted to explore and compare the heat transfer mechanisms.
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