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thermal diffusion coating

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001829
EISBN: 978-1-62708-241-9
...Abstract Abstract An investigation was conducted to better understand the time-dependent degradation of thermal barrier coated superalloy components in gas turbines. First-stage vanes are normally subjected to the highest gas velocities and temperatures during operation, and were thus the focus...
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
... reactions including sensitization, stress-corrosion cracking, and corrosion fatigue. It concludes with a discussion on various protective coatings, such as aluminide coatings, overlay coatings, thermal barrier coatings, and ceramic coatings. References References 1. Fontana M.G. , Corrosion...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... oxidation rate versus temperature. LTHC, low-temperature hot corrosion; HTHC, high-temperature hot corrosion. Courtesy of U.S. Navy Fig. 26 Schematic of cross section of a thermal barrier coating (TBC). Calcium-magnesium-alumino-silicate (CMAS) deposits on the TBC surface, which upon melting...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
... analysis indicated that a decarburized layer existed on all surfaces of the casting, which prevented bonding during the sintering thermal cycle. Bead-to-bead bonding within the coating appeared sufficient, and no decarburized layer was present on the bead surfaces. It was concluded that the decarburization...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... and tubing. The article discusses metallurgical instabilities of steel-based alloys and nickel-base superalloys. It provides information on several life assessment methods, namely, the life fraction rule, parameter-based assessments, the thermal-mechanical fatigue, coating evaluations, hardness testing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001827
EISBN: 978-1-62708-241-9
... (diffusion) coatings and overlay coatings, are applied. Also to reduce the exposure of the superalloys to the highest temperatures in cooled hot parts, a ceramic thermal barrier coating (TBC) is applied. Metals and alloys are known to experience accelerated oxidation when their surfaces are covered...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001679
EISBN: 978-1-62708-229-7
... temperature is about 293K, which creates a tremendous thermal gradient between the walls. Figure 1 represents one stage of the mercury diffusion booster-ejector pump. Fig. 1 Schematic of CVC Third Stage There are two mercury diffusion pumps (237 and 232) in the Tritium Purification process...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001702
EISBN: 978-1-62708-219-8
... maintenance, repair, and remaining service life. Samples are currently being tested for porosity and water-cement ratio. Concrete-rebar interfacial chemistry will be investigated. One-foot thick slabs cut from the beam and coated with thermal spray zinc will be polarized to determine the effect of CP...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... are cathode sputtering and thin multilayer coating. As an example, a potential high-temperature oxidation protection scheme could involve a coating system consisting of a refractory oxide outer layer for erosion protection, a silica glass inner layer for an oxygen diffusion barrier and crack sealant...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
...-Cycle Fatigue Behavior of a NiCoCrAlY-Coated Single Crystal Superalloy ,” NASA Technical Memorandum 89831, NASA Glenn Ressearch Center , 1987 , p 25 10.7449/1988/Superalloys_1988_575_584 8. Boley B.A. and Weiner J.H. , Theory of Thermal Stresses , Courier Corporation , 2012...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... or impact [ 22 ]. The service environments or thermal cycling generally serve to increase the number and/or severity of these inherent coating defects. Apart from the coating thickness variations on the convex and concave sides of the MAR-M302 vane, the diffusion interface appeared reasonably sound...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... and that are protected by a tough coating. Examples would be René 80 and René 77, both of which have been used for blades in the past. The basic equipment required is a low thermal mass programmable furnace, a closed-loop servohydraulic mechanical test machine, and suitable extensometry. A radio frequency (RF) heat...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0090114
EISBN: 978-1-62708-229-7
.... The cooling holes' surface was not coated. Investigation supported the conclusions that the cracking at the cooling holes was due to grain-boundary oxidation and nitridation at the cooling hole surface, embrittlement and loss of local ductility of the base alloy, temperature gradient from the airfoil surface...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... on stress-corrosion cracking, hydrogen embrittlement, and liquid-metal embrittlement of bolts and nuts. The article explains the most commonly used protective metal coatings for ferrous metal fasteners. Zinc, cadmium, and aluminum are commonly used for such coatings. The article also illustrates...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001638
EISBN: 978-1-62708-228-0
... the furnaces of the unit based on a single failure of this kind. Likewise, although diffusion coatings rich in aluminum are available, it is also not considered practical to coat all the transfer lines in response to a single incident. These coatings could not be applied in situ so this would obviously...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
... to thermal breakdown of the resin during attachment to the carrier strip. Gold coat epoxy overlapped the top land termination of many of the samples. While this was probably a process control problem during component manufacture, the dimpled, reflowed appearance of the material on failed components...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001325
EISBN: 978-1-62708-215-0
.... The failure was initially thought to be the result of thermal fatigue, and the internal surfaces exhibited the “elephant hide” pattern characteristic of thermal fatigue. However metallographic failure analysis found that this pattern was the result of corrosion rather than thermal fatigue. Corrosion caused...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
... for postplating baking (generally, approximately 200 to 300 °C, or 390 to 570 °F) gives the hydrogen atoms that are concentrated in the grain boundaries enough thermal energy to diffuse to nonmetallic inclusion boundaries or dislocations, so-called “deep traps.” It is much more difficult for the hydrogen...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
... expensive than zinc plating, the design engineer must consider the possibility that postcorrosion prevention-coating application baking is more readily available for plating than for phosphates. Both plating and phosphate coating can allow damaging amounts of hydrogen to diffuse into the steel. Some...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001396
EISBN: 978-1-62708-229-7
... with which the fire-side is coated. Local breakdown of the layer exposes the ends of the studs to the molten slag which results from combustion of the coal and they thereby suffer attack and ultimately burn away. This occurrence is frequently accompanied by grooving and pitting on the water-side surface...