Layered La2Zr2O7 flexible fibrous membrane for super thermal insulation and infrared stealth
La 2 Zr 2 O 7 fibrous membrane (LZFM), with high uniform distribution and single phase, was fabricated by sol–gel method combined electrospinning technique and the precursor of lanthanum zirconium bimetallic complex, polyacetylacetone lanthanum-zirconium (PALZ) with the ceramic yield of 57.8% was synthesized for the first time. The LZFM had high heat radiation reflectivity (750–2500 nm: Avg 93.2%@1200 °C), low thermal conductivity (25.4 mW·m −1 ·K −1 @-40 °C, 57.5 mW·m −1 ·K −1 @1000 °C), low density (28–50 mg/cm 3 ) and excellent flexibility until 1300 °C. The grain arrangement on the fiber surface was tight with no obvious defects and pores, and the average grain size was only 47.1 nm at 1000 °C for 8 h. The LZFM exhibited excellent high-temperature insulation performance using silicon carbide rod and butane flame as the heat source up to 1530 °C and 1400 °C, respectively. Furthermore, the layered assemblage of LZFM and Al foil was designed, serving as a thermal insulation layer, low-infrared-emission, and high-infrared-reflection layer. The combined structure effectively hid high-temperature targets and achieved infrared stealth (>1300 °C). From the above results, one could find that the LZFM possessed a super high-temperature insulation effect with high thermal stealth performance, implying that LZFM will have a good prospect in thermal insulation protection and infrared stealth.
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