Nano-multilayer thermal insulation coatings have achieved domestic production, with a temperature resistance rating exceeding the 1200℃ mark.
2025-11-28
In recent years, China has achieved breakthroughs in key technologies in the field of nano-multilayer thermal insulation coatings, successfully developing a domestically produced product with a temperature resistance rating of up to 1,200°C. This milestone marks China’s entry into the international forefront in the field of high-temperature protective materials. The coating utilizes nanoscale silicon-based composite materials and employs a triple mechanism—gel-based heat-trapping, expansive thermal insulation, and radiant reflection—to create a molecular-level protective system. Experimental data show that at a high temperature of 800°C, its thermal conductivity is only 0.034 W/m·K, representing a reduction of more than 50% compared to conventional aerogel materials. Moreover, under vacuum conditions, its performance is further enhanced, effectively blocking both convective heat transfer and radiative heat conduction.
The technological breakthrough stems from the precise control of the stacking structure of nanoparticles. Using a two-step acid-base catalytic process, researchers uniformly embedded SiO₂-Al₂O₃ composite nanoparticles into a porous framework, creating a dense thermal insulation layer that achieves an extreme temperature resistance of 1200℃ at a thickness of just 1 mm. This remarkable property makes the material stand out in the field of battery protection for new-energy vehicles—field tests have shown it can extend the thermal runaway escape window to as long as 45 minutes, providing passengers with crucial extra time for safety.
Currently, this technology has entered the industrialization phase. Automotive companies such as BYD and NIO have begun conducting vehicle-mounted testing, and applications are also being validated in fields like industrial kilns and aerospace. With the cost of domestically produced materials dropping by more than 30% compared to imported products, China’s ability to independently control the high-end thermal insulation market has significantly strengthened, providing crucial support for upgrading energy-intensive industries under the “dual-carbon” goals.
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