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aluminide diffusion coatings

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Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001293
EISBN: 978-1-62708-170-2
..., brittle silicide phases ( Ref 13 ). Minor additions of silicon to aluminide coatings on superalloys do enhance hot corrosion resistance. Major developments in diffusion coatings for superalloys (and steels) over the last two decades include modifications of aluminide diffusion coatings with chromium...
Image
Published: 01 January 1994
Fig. 3 Archetypical microstructures of aluminide coatings on a nickel superalloy. (a) Inward diffusion based on Ni 2 Al 3 (and aluminum-rich NiAl). (b) Same as (a) but heat treated at 1080 °C (1975 °F). (c) Outward diffusion of nickel in nickel-rich NiAl. (d) Inward diffusion of aluminum More
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004158
EISBN: 978-1-62708-184-9
... in the coating. If there is free sulfur in the coating, it migrates to the oxide-coating interface, weakening this interface, and increasing the amount of oxide spalling. Diffusion aluminide coatings are nickel aluminide (NiAl) and cobalt aluminide (CoAl). NiAl forms on nickel-base superalloys and CoAl forms...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... and metal dusting, sulfidation, hot corrosion, chloridation, hydrogen interactions, molten metals, molten salts, and aging reactions including sensitization, stress-corrosion cracking, and corrosion fatigue. It concludes with a discussion on various protective coatings, such as aluminide coatings, overlay...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005775
EISBN: 978-1-62708-165-8
... Abstract Pack cementation is the most widely employed method of diffusion coating. This article briefly reviews pack cementation processes of aluminizing, chromizing, and siliconizing. It contains tables that list typical characteristics of pack cementation processes and commercial applications...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001313
EISBN: 978-1-62708-170-2
... an aluminide to a silicide base in the mid 1950s. A list of the basic silicide coatings is shown in Table 6 . Most of the silicide coatings are deposited by pack-cementation diffusion processes. A major deficiency in the performance of silicide-base coatings appears when the system is used in low-pressure...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002473
EISBN: 978-1-62708-194-8
... are not as resistant as Cr 2 O 3 -formers. Because of the “overlay” coating process and the compositional similarity to the superalloy substrates, these coatings are much less susceptible to diffusional wearout than the aluminide conversion coatings. However, there is a reduced aluminum reservoir to sustain Al 2 O 3...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003837
EISBN: 978-1-62708-183-2
... the adherence of the alumina scale and to decrease the oxidation rate. The effects of noble metals on the oxidation behavior of nickel aluminide coatings were extensively reported ( Ref 32 , Ref 33 , Ref 34 ). Whether used as an environmental coating ( Ref 35 ) or as a bond coat for thermal barriers ( Ref...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003164
EISBN: 978-1-62708-199-3
... environments (good aqueous corrosion resistance) Tooling (high-temperature strength and wear resistance developed through preoxidation) Permanent molds (the ability to develop a thermal barrier coating by high-temperature oxidation) NiAl Aluminides Nickel-aluminum containing more than...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003686
EISBN: 978-1-62708-182-5
.... Although not exhaustive, the table illustrates an important distinction between two major classes of coatings: overlay and diffusion (surface modified). In the former, the coatings are applied with minimal change to the substrate. In the latter, however, the coating constituents diffuse into the substrate...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003218
EISBN: 978-1-62708-199-3
... a closed/vented pack to an elevated temperature (e.g., 1050 °C, or 1920 °F) for a given time (e.g., 16 h) during which a diffusional coating is produced. The traditional pack consists of four components: the substrate or part to be coated, the master alloy (i.e., a powder of the element or elements...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001311
EISBN: 978-1-62708-170-2
... and oxidation resistance through the use of polishing, buffing, and wire brushing operations. The article also covers a wide range of surface modification and coating processes, including ion implantation, diffusion, chemical and physical vapor deposition, plating, anodizing, and chemical conversion coatings...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002466
EISBN: 978-1-62708-194-8
... surface hardening and diffusion coatings such as carburizing, nitriding, and carbonitriding. The article also tabulates typical characteristics of carburizing, nitriding, and carbonitriding diffusion treatments. carbonitriding carburizing chemical vapor deposition diffusion coatings electro...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003590
EISBN: 978-1-62708-182-5
..., their coefficients of thermal expansion do not match that of low-alloy, high-temperature steels, and they are sensitive to hydrogen embrittlement. Titanium aluminide (TiAl), which is applied as plasma spray coating by different techniques or in the form of a diffusion coating by codiffusion, is used for operating...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003671
EISBN: 978-1-62708-182-5
... to interdiffusion. These methods are based on the formalism of Fick's law, which includes diffusion interactions among the chemical species ( Ref 18 ). Protective coatings and superalloy substrates generally have widely diverse compositions due to the intended balancing between mechanical properties...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003151
EISBN: 978-1-62708-199-3
...) provide a protective coating to inhibit oxygen attack. Of these two approaches, greater success has been achieved with coatings. Coatings may be classified as intermetallic compounds, including silicides and aluminides that form compact or glassy oxide layers; alloys that form compact oxide layers; noble...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003120
EISBN: 978-1-62708-199-3
... methods. The article also describes the properties, microstructure, and thermal exposure of superalloys. It further discusses the effects of environmental factors on superalloys, including oxidation and hot corrosion. Protective coatings are also discussed. The article provides information...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001101
EISBN: 978-1-62708-162-7
... pressing, diffusion bonding, hot extrusion, reactive sintering, and liquid infiltration. Reference 63 presents evidence that silicon carbide cannot serve as a reinforcement for nickel aluminide IMCs without the use of a diffusion barrier coating. A gas pressure liquid infiltration technique has been used...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005536
EISBN: 978-1-62708-197-9
... based on strength and creep and fatigue resistances, a system selection/development should be optimized to control the interdiffusion fluxes of diffusing components, so that aluminum interdiffusion flux across the coating/superalloy interface is minimized. With this aim in mind, Perez et al. ( Ref...
Book Chapter

Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003685
EISBN: 978-1-62708-182-5
... economy. Coatings were initially used in the 1960s to protect turbine hot section components from oxidation and high-temperature corrosion. Physical vapor deposition coating by electron-beam evaporation and sputtering of chromides and aluminides were used as temperature requirements increased...