Heat-insulating layer made of complex perovskite

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This patent describes a heat-insulating (thermal barrier) layer constructed from complex perovskite materials with exceptionally high melting points (above 2500°C), high thermal expansion coefficients, and excellent phase stability even at high temperatures. The material's specific crystal composition makes it an effective alternative to currently used yttrium-stabilized zirconia (YSZ) coatings, especially in extremely hot environments, such as those found in gas turbines. The invention also provides manufacturing methods for these perovskite-based coatings and their application to metal components.

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• Thermal barrier coatings for parts in gas turbines (e.g., blades, nozzles) in power plants and aircraft engines.
• Heat-insulating layers for internal combustion engines or any high-temperature machinery components.
• Coatings in industrial furnaces or reactors to protect substrates and improve thermal efficiency.
• Thermal insulation for critical aerospace structural elements exposed to extreme heat.
• Protective layers in nuclear reactors or other environments with persistent high temperatures.

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• Withstands extremely high temperatures due to high melting point, expanding usability beyond current commercial coatings.
• High phase stability prevents material degradation during prolonged exposure to heat (>1300°C).
• High thermal expansion coefficient matches better with metal substrates, reducing stress and risk of cracking due to temperature changes.
• Very low thermal conductivity allows better protection for underlying materials, reducing overheating and material fatigue.
• Low tendency for sintering (shrinking and densifying), which ensures the coating’s protective qualities last longer during operation.

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Patent Abstract

A heat-insulating layer has a melting point above 2500° C., a thermal expansion coefficient in excess of 8x10-6 K-1, and a sintering temperature greater than 1400° C. This material has a perovskite structure of the general formula A1+r(B'1/2+xB''1/2+y)O3+z in which: A=at least one element of the group (Ba, Sr, Ca, Be), B'=at least one element of the group (Al, La, Nd, Gd, Er, Lu, Dy, Tb), B''=at least one element of the group (Ta, Nb), and 0.1