pdf steam oxidation of aluminide


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HIGH TEMPERATURE OXIDATION PERFORMANCE OF

Aluminide coatings are of interest for many high temperature applications because of the possibility of improving the oxidation resistance of structural alloys by forming a protective external alumina scale.1-5 Steam and exhaust gas environments are of particular interest because alumina is less susceptible to the Steam oxidation of aluminide coatings under high pressure Nov 01, 2018 · B2-FeAl-based aluminide coatings were elaborated on P92 ferritic-martensitic steels by slurry. A thin protective -Al 2 O 3 oxide layer was stable until 5000 h at 650 °C under flowing steam at 1 bar. At 300 bar and stagnant steam conditions, the morphology of -Al 2 O 3 changed markedly. Iron oxide clusters started to appear at the surface of the scale after 5000 h of exposure and kept on Steam Oxidation of Slurry Aluminide Coatings on Ferritic Steam Oxidation of Slurry Aluminide Coatings on Ferritic Steels for Advanced Coal-Fired Steam Power Plants p.957. A Pilot Plant Study of the Effect of Alkali Salts on Initial Stages of the High Temperature Corrosion of Alloy 304L p.965. High Temperature Corrosion of Superheater Tubes in Waste Incinerators and Coal-Fired Plants Oxidation performance and degradation mechanism of the Jun 15, 2020 · Studies on the oxidation performance of the aluminide coatings in steam or oxygen/water vapor mixture indicated that protective -Al 2 O 3 scales could grow at temperatures even lower than 700 °C which is typically observed above 900 °C in dry air/oxygen, although the formation mechanism of -Al 2 O 3 was not well discussed there [4,12,13 FINAL REPORT Aluminide Coatings for Power-Generation Aluminide coatings are of interest for many high temperature applications because of the possibility of improving the oxidation of structural alloys by forming a protective external alumina scale. In order to develop a comprehensive lifetime evaluation approach for aluminide coatings used in fossil energy systems, some of the Long exposure steam oxidation testing and mechanical Studies on the oxidation performance of the aluminide coatings in steam or oxygen/water vapor mixture indicated that protective -Al 2 O 3 scales could grow at temperatures even lower than 700°C Oxidation of Slurry Aluminide Coatings on Cast Stainless Feb 20, 2013 · Oxidation Testing of Coated CF8C and CF8C-Plus Alloys. Figure 7 compares the cyclic oxidation behavior (100 h cycles) of various slurry, CVD and PC coatings on alloys CF8C and/or CF8C-P at 800 °C in air + H 2 O. The CVD aluminide coatings on both alloys showed similar semi-parabolic mass gains with no signs of mass loss after 3 kh. Enhancing Steam Oxidation Resistance of Ferritic Steels A nickel aluminide coating was formed on P92 steel substrate using a two step process of electro-Ni plating followed by pack aluminising at 650 °C. The coating was tested in 100% steam to assess its resistance against steam oxidation at 650 °C using a purpose-built rig for steam oxidation tests. The data obtained were compared with those measured from air oxidation test at the same temperature. Water vapor effect on high-temperature oxidation were obtained by Agüero et al for iron aluminide-coated ferritic steels [32] after a very prolonged exposure (32000h) to steam at 650 C. According to a recent review by Saunders et al [33], water vapor strongly affects the high-temperature oxidation behavior of alumina-forming materials. Except for the paper of Regina et al [34], which deals and Deuterium Permeation Resistance of Aluminide reported that there is a signicant mismatch between aluminide coatings and steel substrates, which could lead to tensile cracks, aluminide coatings still showed good stability after steam exposure for 2000 h. However, aluminide TPBs often exhibit much lower actual performance than predicted based on bulk material properties [9,10].

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