Thermal barrier coatings (TBCs) provide effective thermal barrier to the components of gas turbine engines by allowing higher operating temperatures and reduced cool‐ ing requirements. Plasma spraying, electron-beam physical vapor deposition, and sol‐ ution precursor plasma spray techniques are generally used to apply the TBCs on the metallic substrates. The present article addresses the TBCs f...

Thin layers of thermal barrier coating (TBCs) are applied to metallic components of heat engines to reduce metal temperatures and to provide environmental protection. This results in increased engine efficiency and prolonged operational life. Of special current interest is the use of TBCs in aircraft engines. The TBCs, often yttria-stabilized zirconia (YSZ), are deposited on nickel or cobalt-ba...

The need of a higher role solar energy within the mix in coming decades obliges collectors to increase their performance and reliability. It is demanded that absorbers, as key component thermal collectors, should be low cost with high efficiency for extended lifetimes under different kinds environments. Commercially, there are presently two main types solutions selective absorbers coatings temp...

Stagnation is the transient state of a solar thermal system under high irradiation where useful gain zero. Both flat-plate collectors with selective absorber coatings and vacuum-tube exhibit stagnation temperatures far above saturation temperature glycol-based heat carriers within range typical pressures. Therefore, always associated vaporization propagation vapor into pipes circuit. It therefo...