developments in high temperature corrosion and protection of materials pdf

Developments In High Temperature Corrosion And Protection Of Materials Pdf

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The significant weight loss by water flow was observed except for the test in the water with DO 8 ppm.

Part 1 Developments in high temperature corrosion: Diffusion and solid state reactions; Transition between external and internal oxidation of alloys; Modern analytical techniques in high temperature oxidation and corrosion; Metal dusting corrosion of metals and alloys; Tribological degradation at elevated temperatures; Hot corrosion of alloys and coatings; Oxide scales on hot-rolled steel strips. Part 2 Developments in protective oxide scales and coatings: High-temperature corrosion mechanisms in layered ternary ceramics; Formation and growth of protective alumina scales; Oxidation of Ti-Al intermetallic compounds; Oxidation of metal matrix composites; Design strategies for new oxidation-resistant high temperature alloys; Oxidation behaviour of chemical vapour deposited silicon carbide; Oxidation resistant nanocrystalline coatings; Thermal barrier coatings. Part 3 Case studies: High temperature corrosion problems in the petrochemical industry; Oxidation processing of electronic materials; Corrosion in modern incinerators; Sulfidation of metallic materials. High temperature corrosion is a phenomenon that occurs in components that operate at very high temperatures, such as gas turbines, jet engines and industrial plants.

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The demand for environmentally and resources-friendly processes as well as higher efficiency in thermal plants and machinery requires an increase of operating temperatures. However, processes conducted at high temperatures and often in complex atmospheres lead to increasing demands on the high temperature corrosion resistance of the materials used. The main research objectives of the "high temperature materials" group at DFI are material analysis and development in the field of aggressive, high temperature environments.

Within this research field, we focus on the development of metallic and ceramic protective coatings and innovative material systems appropriate for extremely aggressive service conditions e. In order to produce such coatings, the material surface is enriched with protective elements by diffusion, which later prevent substrate corrosion during high temperature exposure.

Computer simulation tools are used to predict the material behaviour during manufacturing as well as their lifetime during their operation at high temperatures. The replacement of Ni-based alloys by lighter materials in aviation turbines can decrease the CO 2 emissions. Providing high temperature protective coatings with additional properties such as self-cleaning, thermal insulation or improved aerodynamics can increase the quality and the efficiency of different engineering processes.

New developments show that a slight change in the chemical composition near the surface region of different materials induces a change in the reaction mechanisms and hence in their corrosion behaviour as well.

The work group also shares its methods and experience with industry and offers professional support and advice regarding industrial material problems and their explanation. More information on research for industry. High Temperature Materials Research Group. Share Share Share Share. Head of the group Associate Prof.

Mathias Galetz Tel. Anke Silvia Ulrich Tel. Upcoming courses more courses.

High‐temperature‐resistant (slurry‐based) coatings

Houston, Texas, USA. March 18—21, This study was undertaken to test and quantify the erosion protection available from coatings normally used for corrosion protection in the hot section of gas turbine engines. Quartz and fly ash particles were used. The data indicates a significant life improvement by the use of these coatings, which in turn is proportional to the coating thickness. Sign In or Create an Account. Sign In.

Developments in High Temperature Corrosion and Protection of Materials

They are severely degraded by oxidation and thermal stresses that occur due to the cyclic operating conditions. Diffusion coatings improve the high temperature corrosion resistance of materials by enriching the subsurface zone with elements that form protective oxide scales, which increases the lifetime under the mentioned conditions. A new model is proposed, that allows the prediction of the coating thickness and the phases occurring on the basis of the thermodynamic and kinetic mechanisms during the coating process and therefore creates the basis for a more sophisticated understanding and optimization of the diffusion coatings. Additionally, in this work Al single element diffusion coatings and Al-Si co-diffusion coatings were developed.

Alloy Development for High Temperature Corrosion and Protection
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