Sandwich Thermal Insulation Layer System and Method for Production

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This invention describes a multilayer ('sandwich') thermal insulation system for components exposed to high and fluctuating temperatures. The system consists of a gas-tight glass-metal composite layer and a superimposed, porous ceramic layer, such as yttrium-stabilized zirconium oxide (YSZ). The method of production includes forming and partially removing a corroded part of the composite layer to improve adhesion, leading to a long-lasting, heat-resistant insulation structure with superior adherence and reduced susceptibility to aging and oxidation.

Use CasesContent extracted from patent full text and abstract with AI.

• Thermal insulation for turbine blades in gas turbines (aerospace and power generation)
• Coating for engine components in internal combustion engines
• Thermal barrier for exhaust systems or heat exchange pipes exposed to hot gases
• Protection of steam turbine components subject to high thermal cycles
• High-temperature insulation for industrial processing equipment, kilns, and reactors
• Heat-shielding surfaces in aerospace or automotive applications
• Insulation of pipes carrying corrosive or high-temperature gases

BenefitsContent extracted from patent full text and abstract with AI.

• Improved adhesion between the insulation layers, increasing durability and service life
• Enhanced protection against oxidation and corrosion at high temperatures
• Lower thermal conductivity, leading to optimal insulation performance with thinner layers
• Reduced aging and degradation of the insulation, even under frequent temperature fluctuations
• Customizable material composition to fit specific application and thermal requirements
• Resistant to spalling or delamination due to engineered interfacial roughness and partial crystallinity
• Applicable in mass production with reproducible quality and cost-effectiveness

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Patent Abstract

The invention relates to a method for production of thermal insulation layers which adhere better to components even at high, frequently changing temperatures. A gas-tight glass-metal composite layer is applied to the component and aged. The corroded part of the gas-tight layer is then removed and a second porous layer applied which can be made from a ceramic material in particular, an yttrium-stabilised zirconium oxide. The invention further relates to a thermal insulation layer which is made up of a sandwich of a gas-tight glass-metal composite layer and a superimposed further porous layer. As a result of the boundary volumes of the composite layer with the further layer being partly crystalline the adhesion within the sandwich is markedly improved with relation to the prior art. It is thus possible to produce a sandwich of silicate glass- metal composite layers and yttrium-stabilised zirconium oxide which is stable to heat over a long period of time. Such a sandwich is particularly useful for application as thermal insulation layer due to combining good oxidation protection with a low heat conductivity and low susceptibility to aging.