pdf steam oxidation of aluminide

pdf steam oxidation of aluminide

(PDF) Oxidation of Uncoated and Aluminized 9-12% Cr

Oxidation of Uncoated and Aluminized 9-12% Cr Boiler Steels at 550-650 °C

(PDF) Steam Oxidation of Slurry Aluminide Coatings on

The use of slurry aluminide coatings on ferrite steels for advanced coal-fired steam power plants were analyzed. The materials used were found to have good high temperature oxidation resistance A Comparative Study ofReforming Technologies:Steam reforming (SMR), partial oxidation (POX), auto thermal reforming (ATR) and dry reforming (C02 reforming). SMR involves oxidation of hydrocarbon by steam while POX uses air. ATR is basically a combination of SMR and POX, where both the endothermic reaction with steam and exothermic reaction with oxygen occurs, converting the hydrocarbon to

BEHAVIOR OF ALUMINUM COATING BY CVD-FBR IN

to steam oxidation of the substrate. The coatings were treated thermally to form layers or iron aluminides (intermetallic compounds) on the respective steel, responsible for protection against steam oxidation, because they act as a source of aluminum for the formation of alumina (Al 2 O 3), upon contact with steam during oxidation. Cyclic oxidation and mechanical behaviour - ScienceDirectApr 02, 2007 · The excellent steam oxidation resistance of iron aluminide coatings on ferritic steels at 650 °C has been demonstrated both by laboratory tests and field exposure. These coatings are formed by the application of an Al slurry followed by diffusion heat treatment at 700 °C for 10 h.

Cyclic oxidation behaviour of Pt-doped aluminide coating

Nov 20, 2019 · A Pt modified aluminide coating is prepared on the nickel-based alloy DZ125 containing Hf. After adding Pt, the continuous distribution of HfO 2 could be observed at the oxide-scale/coating interface. Continuous HfO 2 at the oxide-scale/coating interface could reduce the growth rate of the oxide scale. The local undulation of the oxide scale is enhanced due to the formation of continuous HfO 2. Degradation of Aluminide Coated Directionally Oxidation Oxidation of the aluminide coating leads to the formation of Al203 which if mechanically stable can provide very good oxidation resistance. In actual service operation, cyclic variation in turbine blade temperature results in spalling of the Al203 from the coating.

Deposition process of slurry iron aluminide coatings

Diffusion iron aluminide coatings prevent steam oxidation of ferritic/austenitic steels at 650°C for at least 45,000 h. These coatings are deposited by applying Al slurries followed by a diffusion heat treatment at 650°C. Effect of Al and Cr Content on Air and Steam Oxidation of DOI:10.1007/s11085-017-9745-1 Corpus ID:99233203. Effect of Al and Cr Content on Air and Steam Oxidation of FeCrAl Alloys and Commercial APMT Alloy @article{Unocic2017EffectOA, title={Effect of Al and Cr Content on Air and Steam Oxidation of FeCrAl Alloys and Commercial APMT Alloy}, author={Kinga A. Unocic and Y. Yamamoto and Bruce A. Pint}, journal={Oxidation of Metals},

Effect of Substrate Roughness on Oxidation Resistance

near-surface region. Therefore, an effect on oxidation behavior can be expected. Sun et al. [21] used electrolytic polishing to decrease the roughness of an aluminide layer on an Fe-base substrate during studies on formation and phase transformation of an aluminide coating prepared by a low temperature aluminizing process. High Temperature Oxidation Behavior of Aluminide The present research aims to evaluate the oxidation aluminide coated UNS S30815 Stainless steels coated using pack cementation method. To evaluate oxidation behavior, different types of oxidation, such as isothermal oxidation and cyclic oxidation at 1050 °C were carried out to investigate the role of the coating layer during oxidation. 2.

High temperature oxidation of low carbon steel with and

Jul 13, 2018 · PDF e-reader protective Al 2 O 3 layer formed on the surface of aluminide steel can serve as a barrier to hydrogen penetration in the aluminide layer; thus, the oxidation rate of bare steel was significantly slower in the atmosphere containing both water vapor and hydrogen. Steam oxidation of ferritic steelslaboratory test kinetic Improvement in Resistance to Steam Oxidation of Improvement in Resistance to Steam Oxidation of Aluminide-Coated AISI 304 and AISI 316 Steel Produced by Chemical Vapor Deposition in a Fluidized Bed Reactor J. L. Marulanda2 S. I. Castaneda1 F. J. Pe´rez1 Received:18 February 2015/Revised:26 June 2015/Published online:11 July 2015 Springer Science+Business Media New York 2015

Improvement in Resistance to Steam Oxidation of Aluminide

Various techniques have been used to deposit aluminium on ferritic and austenitic steels to increase their oxidation resistance. An aluminide coating was deposited on AISI 304 and AISI 316 stainless steels by chemical vapor deposition at 580 °C for 1.5 h in a fluidized bed reactor. The as-deposited samples were treated at 750 °C in Ar atmosphere for 2 h. Improvement in Resistance to Steam Oxidation of Aluminide Various techniques have been used to deposit aluminium on ferritic and austenitic steels to increase their oxidation resistance. An aluminide coating was deposited on AISI 304 and AISI 316 stainless steels by chemical vapor deposition at 580 °C for 1.5 h in a fluidized bed reactor. The as-deposited samples were treated at 750 °C in Ar atmosphere for 2 h.

Kinetics Growth and Oxidation Resistance of Aluminide

authors present in the article the results of oxidation resistance analysis of aluminide coatings which were obtained on the surface of Rene 80 superalloy using various techniques. It was shown that the coating created during the CVD process was characterized by a good oxidation resistance at the temperature of 1100C. Kinetics Growth and Oxidation Resistance of Aluminide authors present in the article the results of oxidation resistance analysis of aluminide coatings which were obtained on the surface of Rene 80 superalloy using various techniques. It was shown that the coating created during the CVD process was characterized by a good oxidation resistance at the temperature of 1100C.

Microstructural Evolution of Slurry Fe Aluminide Coatings

Slurry iron aluminide coatings are very resistant to steam oxidation at 600-650º C. These coatings can be used to protect new generation Ultra Super Critical (USC) steam power plant ferritic/martensitic steel components. The microstructure of the initially deposited coating changes as a function of time, mainly due to coating-substrate interdiffusion, going from mostly Fe2Al5 to FeAl, causing Microstructure and High Temperature Oxidation Selective oxidation of these coatings forms a slowly growing protective layer which is the basis for the oxidation protection at high temperatures. Selective oxidation is a process in which a solute metal oxidizes preferentially to the parent elements and forms a continuous layer on the surface, Pettit (1967), Schumann and Rühle (1994), Lee et al.

Microstructure and High Temperature Oxidation

Selective oxidation of these coatings forms a slowly growing protective layer which is the basis for the oxidation protection at high temperatures. Selective oxidation is a process in which a solute metal oxidizes preferentially to the parent elements and forms a continuous layer on the surface, Pettit (1967), Schumann and Rühle (1994), Lee et al. Microstructure and Oxidation Behavior of Modified 3.2. Isothermal oxidation tests of the coatings and the uncoated alloy at 1 100 °C Isothermal oxidation kinetics of the specimens are shown in Fig. 3. All the specimens exhibited similar mass gain during the first 10 h oxidation except the bare alloy, which developed rapid oxide growth in the early oxidation and kept high oxidation rate during the

Oxidation of Alloys in Steam Environments - A Review

steam at high pressure flowing at high rates and often in the presence of heat flux. Similarly components in steam turbines are exposed to high-pressure steam atmospheres. Service lifetimes of these components may be limited by creep, fatigue or oxidation. Traditionally materials designed for use at high temperature have been developed primarily Oxidation of Zircaloy by Steam and OxygenOxidation of Zircaloy by Steam and Oxygen The following is an analysis of the chemical energy released from the oxidation of zircaloy in either steam or air. Both oxidation reactions are exothermic, releasing heat as the metal Zr is converted to ZrO2.The reactions under consideration are as follows:Zr+02 -> ZrO2 +AH 0 2 and

Oxidation of coarse aluminum in pressured water steam

The rate of aluminum oxidation in steam increases with increasing temperature and steam pressure. Conversion degree of aluminum granules with the size of about 1 cm was 0.93 at 300°C after 4 hours; 0.96 and 1 at 350°C after 2 and 4 hours, respectively; 0.81 and 0.99 at 400°C after 1 Oxidation performance and degradation mechanism of 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

Performance of Aluminide and Cr-Modified Aluminide Pack

Jan 24, 2019 · Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating with Al content of 1011 wt % demonstrated superior performance than bare 304 and Cr-modified aluminide Platinum-Modified Diffusion Aluminide Coatings on the subsequent cyclic oxidation resistance of Pt-aluminide coatings. 14. SUBJECT TERMS Superalloys, Nickel-base superalloys, Platinum coatings, Single crystals 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION OF REPORT OF THIS PAGE Unclassified Unclassified NSN 7540·01·280-5500 i Oxidation resistance, 15. NUMBER 31 OF PAGES t9.

SermaLoy J Diffusion Aluminide Coating

oxidation resistance of SermaLoy J coating is due in part to reduced oxygen mobility through the pure alumina as well as to the stabilizing effect that the silicon has upon the aluminide. Silicon in the SermaLoy J coating also helps prevent thermal fatigue cracking. Thermally induced strains Standard Test Method for Oxidation Stability of Steam Oxidation Stability of Steam Turbine Oils by Rotating Pressure Vessel1 This standard is issued under the xed designation D 2272; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

Steam Oxidation of Aluminide-Coated and Uncoated -

The efficiency of ultra-supercritical (USC) steam power plants is limited by the materials properties, in particular, the steam oxidation resistance of the currently used steels at temperatures higher than 600 °C. Under these conditions, steam oxidation results in the development of thick oxide scales which spall and can accumulate in tube bends leading to blockage, overheating and premature 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

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 Steam oxidation and mechanical performance of a ferritic Adding aluminide coatings to the surfaces of the steels can improve the oxidation resistance of this class of material through the growth of an Al 2 O 3 scale. One of the major concerns in using coating is the potential deleterious effects on the mechanical properties of the substrate, either through the precipitation of brittle phases or

Steam oxidation of aluminide coatings under high pressure

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 The Microstructure and Oxidation Resistance of The aluminide coatings are formed as a result of a diffusion heat treatment process, in the atmosphere of argon, hy-drogen or in vacuum. The slurry method is used for preparation of coatings on the turbine blades. It enables to create the aluminide coating on the surface of regener-ated blade. It is possible to modify the chemical compo-

US5658614A - Platinum aluminide CVD coating method

A method of improving the oxidation resistance of a platinum modified aluminide coating formed on a nickel base superalloy substrate, comprises providing a platinum layer on the substrate, heating the substrate in a coating retort to a temperature of at least about 1000° C., forming external of the coating retort a high purity coating gas comprising hydrogen and aluminum trichloride, and [JCSE])Boro-Aluminide Coatings for Protection against High Temperature Steam Oxidation. N.E. Maragoudakis, S.D. Tsipa, G. Stergioudis, H. Omar, D.N. Tsipas This version is obtained by extracting the text from the PDF or HTML file, and it is not guaranteed that the text will be

Abstract and Figures

Steam Oxidation of Aluminide-Coated and Uncoated TP347HFG Stainless Steel under Atmospheric and Ultra-Supercritical Steam Conditions at 700 °C.pdf Available via

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