Thermal Barrier Coating: Fundamentals, Uses and Applications

The thermal barrier coating is a type of multi-system materials with the major function of thermally insulated elements. The conductivity dictates the temperature variance across the painting and the heat gain or loss. One of the most common uses is in the combustion of aircraft turbine engines.

With the demand for increased power and fuel economy, the combustion temperatures are approaching the limits of the design of the metal alloys from which turbine components are created. Other applications allow the use of the composites at a higher temperature, by decreasing the temperature to which the parts are being uncovered.

Scientific Fundamentals

Greater fuel efficiency can be attained when the engines do work at high temperatures, which may be exposed components to extreme service conditions. They are designed to enhance the effectiveness of an engine without boosting the surface temperature, allowing the motor to work at the gas temperatures above the alloy’s melting point. The major driving force for the development has been the advantages to be gained from the lengthened life of the metallic components in the section of a turbine engine by decreasing the surface temperature. With the ability of spray to apply an almost limitless number of materials, the well-engineered structure can be produced to solve even the most complex problems. When engineering such system, it utilizes its strong expertise and skills in materials designing and its strength of knowing the entire processes of spray. The mixture of this knowledge delivers particular application solutions to the customers’ management problems.

Coating Materials

The most commonly used spray in thermal barrier coating materials for the area of turbine engines are the oxide ceramics. However, the materials have been utilized for the coatings, even for the metal alloys. Materials used for thermal management include alumina compounds, YSZ, stainless steels, and refractory metals. Because each thermal management issue is unique, consultation with the engineering staff is always recommended.

Substrate Materials

There are few limitations to the substrate materials. Ordinarily, such are applied to the metallic substrates’ composite structures. Where the application includes high temperatures, the graduated paints are used to mitigate expansion between the coats and the substrate.

Aviation Sector

Interest in boosting the efficiency of a gas turbine engine for the aviation application that has prompted research in a higher combustion temperature. Turbine efficiency is correlated strongly with combustion temperature through the completeness of every combustion reaction. In a combustion, the lower temperature has fewer hydrocarbon bonds and produces less thrust needing more fuel.

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