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Diffusion coatings

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Published: 01 March 2002
Fig. 13.18 Flow diagram for typical pack diffusion coating process More
Image
Published: 01 September 2022
Fig. 7 Kirkendall voids observed in a Fe-Al diffusion coating. Source: Ref 3 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
.... It discusses the mechanisms behind interstitial, substitutional, grain boundary, and surface diffusion, the derivation and use of Fick’s laws, and the basic principles of diffusion coating processes, including carburizing, nitriding, nitrocarburizing, cyaniding, carbonitriding, boriding, aluminizing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
... Abstract This chapter provides practical information on surface treatments that work by altering the surface chemistry of metals and alloys. It discusses the use of phosphate and chromate conversion coatings as well as anodizing, steam oxidation, diffusion coatings, and pack cementation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500317
EISBN: 978-1-62708-317-1
... hardening, case (surface) hardening, and nitriding as well as hard chrome plating, vapor deposition, and thermal diffusion coating. It explains how to measure wear resistance using various tests and provides guidelines for selecting tool materials, treatments, and coatings. chemical vapor deposition...
Image
Published: 01 December 1989
Fig. 6.47. Results of laboratory solid-particle erosion tests ( Ref 114 and 115 ). Note: At end of 100-h test   • 80% of original plasma coating present   • <10% of original diffusion coating present More
Image
Published: 01 March 2002
Fig. 13.20 Ductility of CoCrAlY overlay and standard diffused aluminide coatings showing ductility improvements possible with appropriate overlay compositions More
Image
Published: 01 June 2016
Fig. 7.4 CoNiCrAlY coating after diffusion heat treatment. Aluminum-rich β phase is seen as the dark phase in the matrix (white arrows). Source: Ref 7.9 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280287
EISBN: 978-1-62708-267-9
... (267 Pa) of oxygen, a continuous Cr 2 O 3 layer may develop with as little as 20% Cr. Achieving the Right Oxide Protection in Real Alloys In general, protective oxidation involves the diffusional transport of one or more of the reactants through the oxide layer, and it is plainly desirable...
Image
Published: 01 November 2007
Fig. 11.7 Scanning backscattered electron image showing the oxidation attack of the diffusion coating and the substrate steel. The chemical analysis at different locations was performed using EDX. The results of the analysis (wt %) are summarized as: No. 1: 23% V, 20% Ni, 17% Si, 10% Fe, 8 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080003
EISBN: 978-1-62708-304-1
... diffusion coating, chromized coating, has also reportedly been used in boilers. Both of these diffusion coatings are very thin. Coatings have been highly successful in providing protection against oxidation and hot corrosion for the high-temperature components, such as airfoils, in gas turbines...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.9781627084321
EISBN: 978-1-62708-432-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240563
EISBN: 978-1-62708-251-8
..., and secondary fabrication processes. It also covers coating technology, including aluminide diffusion and overlay coatings, and addresses the advantages and disadvantages of superalloys in various applications. cast nickel-based superalloys wrought nickel alloys wrought cobalt-based superalloys cast...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300335
EISBN: 978-1-62708-323-2
... profile (case depth) on a carburized surface; this is the accepted way of determining the depth of a diffusion treatment (case depth). Coatings are measured with magnetic or eddy-current gages; physical vapor deposition (PVD) coatings require more sophisticated techniques, such as polishing through...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050031
EISBN: 978-1-62708-432-1
... Abstract This chapter familiarizes readers with the use of Fick’s laws of diffusion in heat treating, coating, and other metallurgical processes. It contains worked solutions to nearly 30 problems requiring the calculation of activation energy, diffusion coefficient, concentration level...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900305
EISBN: 978-1-62708-358-4
... are transition microstructures formed at higher substrate temperatures. The coatings are denser and the coating surfaces are smoother than zone 1′ microstructures because of increased adatom surface diffusion at higher substrate temperatures. These transition microstructures are still very fine...
Image
Published: 01 March 2002
Fig. 13.17 Archetypical microstructures of aluminide coatings formed on a typical nickel-base superalloy. (a) Inward diffusion based on Ni 2 Al 3 , (b) same as (a) but heat treated at 1080 °C (1975 °F), (c) outward diffusion of nickel in nickel-rich NiAl, and (d) inward diffusion of aluminum More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000001
EISBN: 978-1-62708-313-3
.... Diffusion coatings were the first to be developed in which large amounts of principally aluminum were diffused into the surface of the substrate superalloy. These coatings proved to be highly successful because their increased oxidation and corrosion resistance permitted turbine inlet temperatures up...
Image
Published: 01 September 2022
Fig. 14 Concentration profile from surface to core with three different times (t 0 , t 1 , t 2 ) in thin film diffusion; (a) thin film coated on a substrate; (b) concentration of atoms in thin films varies as a function of diffusion depth with three different time scales. More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410551
EISBN: 978-1-62708-265-5
... of the effects of laser- and electron beam heating, melting, and solidification. Source: Ref 22.53 Hierarchy of equilibrium Table 22.1 Hierarchy of equilibrium Full diffusional (global) equilibrium No chemical potential gradients (compositions of phases are uniform) No temperature...