Sökning: "protective coating."
Visar resultat 16 - 20 av 64 avhandlingar innehållade orden protective coating..
16. Corrosion Behavior of HVAF-Sprayed Bi-Layer Coatings
Sammanfattning : In a variety of engineering applications, components are subjected to corrosive environment. Protective coatings are essential to improve the functional performances and/or extend the lifetime of the components. LÄS MER
17. Failure of thermal barrier coatings under thermal and mechanical fatigue loading : microstructural observations and modelling aspects
Sammanfattning : Industrial and air-borne gas turbine hot components suffer from creep, oxidation, corrosion and microstructural degradation if not shielded from the hot and aggressive combustion gases. Two major strategies commercially available are adopted; film cooling by pressurised air and application of protective coatings. LÄS MER
18. The rule of hydrogen and rare earth metals in the formation of protective metal-oxides
Sammanfattning : The effects of hydrogen and rare earth metal (REM) additionson the oxidation behavior of metals and alloys that formchromia, alumina and zirconia in 20 mbar O2and/or H2O have been investigated at elevated temperatures.The metal-gas reactions were studied by the use of isotopicallylabeled gas in combination with mass spectrometry and bymeasuring changes in the total pressure in a closed reactionchamber. LÄS MER
19. Ni-based coatings for high temperature corrosion protection
Sammanfattning : Biomass/waste-fired boilers severely suffer from high temperature corrosion of critical load-bearing components, e.g. water-wall and superheater tubes, due to presence of Cl-containing corrosive species. LÄS MER
20. Oxidation behaviour of MCrAlX coatings : effect of surface treatment and an Al-activity based life criterion
Sammanfattning : MCrAlY coatings (M=Ni and/or Co) have been widely used for the protection of superalloy components against oxidation and hot corrosion in the hot sections of gas turbines. The drive to improve engine combustion efficiency while reducing emissions by increasing the operation temperature brings a big challenge for coating design. LÄS MER