Protective Systems for High Temperature Applications Efc 57: From Theory to Industrial Implementation

ISBN-13: 9781906540357 / Angielski / Twarda / 2011 / 417 str.

M. Schutze

Opis

Recent initiatives and developments in high temperature technology aim at the exploitation of fuels end processes at the edge of present materials capabilities, driving service temperatures higher and operating within ever more aggressive environmental conditions. The major driving force behind this trend is increased efficiencies and further growing efforts in environmental protection. The key to reliable operation of components for sufficiently long service periods to a large extent lies in the high temperature properties of the materials used, with high temperature corrosion resistance as the major life and performance-limiting factor. As conventional alloy design invariably leads to a compromise between mechanical strength and corrosion resistance industry has turned to coatings to provide improved materials performance. Consequently there is extensive worldwide activity to develop high performance protective coating systems, to prevent or minimise damage by corrosion, as well as by abrasion, wear and erosion at elevated temperature. Many of these systems (which may consist of surface modified bulk materials or genuine coating systems and in some cases also of special alloy approaches) are based on systematic development starting from present theoretical understanding including laboratory data and ending up in tailor-made solutions for industrial applications.

Spis treści

Section 1: Aggressive Combustion Environments 1. Influence of novel cycle concepts on the high temperature corrosion of power plants 2. Corrosion behaviour of boiler steels, coatings and welds in flue gas environment 3. Corrosion of alloys and their diffusion aluminide coatings by KCI:K2SO4 deposits at 650 °C in air 4. Oxide scale formation on Al containing Ni–Cr-based high-temperature alloys during application as flame tube material in recirculation oil burners 5. Development of thermally-sprayed layers for high-temperature areas in waste incineration plants Section 2: Steam Environments 6. High velocity oxy-fuel (HVOF) coatings for steam oxidation protection 7. Identification of degradation mechanisms in coatings for supercritical steam applications 8. Thermogravimetry-mass spectrometry studies in coating design for supercritical steam turbines Section 3: Catalytic Converters 9. Void formation and filling under alumina scales formed on Fe–20Cr–5Al-based alloys and coatings, oxidised at temperatures up to 1200 °C 10. Influence of a TiO2 surface treatment on the growth and adhesion of alumina scales on FeCrAl alloys 11. A new austenitic alumina forming alloy: Aluminium-coated FeNi32Cr20 Section 4: Gas Turbines – Oxidation and Corrosion Protection 12. Effectiveness of platinum and iridium in improving the resistance of Ni-Al to thermal cycling in air-steam mixtures 13. Effect of manufacturing-related parameters on oxidation properties of MCrAlY bond coats 14. Effect of creep-deformation on oxidation behaviour of nickel-based alloy with a rhenium-based diffusion barrier coating 15. Hot corrosion of coated and uncoated single crystal gas turbine materials 16. Oxidation and alkali sulphate-induced corrosion of aluminide diffusion coatings with and without platinum 17. Improving the oxidation resistance of c-titanium aluminides by halogen treatment Section 5: Gas Turbines – Thermal Protection 18. Effect of surface preparation on the durability of NiCoCrAlY coatings for oxidation protection and bond coats for thermal barrier coatings 19. Parameters affecting the growth rate of thermally grown oxides and the lifetime of thermal barrier coating systems with MCrAlY bond coats 20. Influence of bond coat surface roughness on chemical failure and delamination in thermal barrier coating systems 21. Investigation on the oxidation behaviour of gamma titanium aluminides coated with thermal barrier coatings 22. Role of bond coat depletion of aluminium on the lifetime of air plasma sprayed thermal barrier coatings under oxidising conditions 23. A software tool for lifetime prediction of thermal barrier coating systems 24. Waste incineration corrosion processes: Oxidation mechanisms by electrochemical impedance spectroscopy 25. Behaviour of NiAl air plasma sprayed coatings in chlorine-containing atmospheres 26. Parameters governing the reduction of oxide layers on Inconel 617 in an impure VHTR He atmosphere 27. Protective coatings for very high-temperature reactor applications 28. Oxidation of electrodeposited Cr-C at temperatures between 400 °C and 900 °C in air 29. Experimental analysis and computer-based simulation of nitridation of Ni-Base alloys – the effect of a pre-oxidation treatment 30. Influence of alloy compositions on the halogen effect in TiAl alloys 31. Modelling of the long-term stability of the fluorine effect in TiAl oxidation 32. High-temperature oxidation of Ti3Al0.7Si0.3C2 in air at 900 °C and 1000 °C

O autorze

M. Schutze