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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
... and (b) inner root area of 700ES 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...
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
... coatings, thermal barrier coatings, and ceramic coatings. aluminide coatings carburization ceramic coatings chloridation corrosion fatigue high temperature corrosion hot corrosion hydrogen interaction metal dusting molten metals molten salts overlay coatings oxidation protective coatings...
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
... 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 did...
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
... coatings that improve performance of superalloy. diffusion gas turbines high-temperature coatings high-temperature corrosion interdiffusion oxidation superalloys WHEN CORROSION FAILURES OCCUR at high temperatures (300 to 1700 °C, or 570 to 3090 °F), the unscheduled outages result in loss...
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
... 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 at SRS. The 237...
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
... protective coatings of two types, aluminide or chromium (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. High-temperature hot corrosion (HTHC) has...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
... the rotation of the blade. Because the rotational speed of the turbine is relatively easily controlled, creep failures from excessive turbine speed are rare. Metal temperatures can increase beyond the design point, either from excessive heat input (increased firing temperature, loss of thermal barrier coating...
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
.... 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, microstructural...
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
... of processing. The dark yellow color of the oily residue observed at the metallization interface of the group 3 samples was most likely due 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...
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
.... Fig. 17 Coating degeneration and corrosion attack in MAR-M302 vane along the concave airfoil side. (a) Fine cracking; (b) Subsurface shrinkage porosity; (c) Corrosion product penetration in the subsurface porosity. The coating and the diffusion zones between the coating and the matrix were...
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
... of steels). The two primary objectives are to minimize heat losses and to prevent various fluids and solids from coming in direct contact with the outer skin (again, most of the time, made of steels). Unlike thin organic linings and coatings, refractory linings may consist of one or many times two...
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
... Abstract Thermomechanical fatigue (TMF) is the general term given to the material damage accumulation process that occurs with simultaneous changes in temperature and mechanical loading. TMF may couple cyclic inelastic deformation accumulation, temperature-assisted diffusion within the material...
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
... 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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001702
EISBN: 978-1-62708-219-8
... presented in Figure 5 . Bare concrete on bent 8 and pier 9 of the Yaquina Bay Bridge (Newport, OR) gave values ranging from 14.5 to 17.2 mL/min. Measurements on a thermal spray zinc coating, recently installed for an impressed current cathodic protection (ICCP) system at the Yaquina Bay Bridge, gave values...
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 Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
...-boundary films of M 23 C 6 at elevated temperatures 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. Experimental Techniques Equipment The basic equipment required is a low thermal mass programmable furnace...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
... turbine blades in order to ensure that these components will meet the expected design life. There are three primary types of coatings: Coating systems that during diffusion produce intermetallic compounds (mainly aluminides), in this case NiAl Complex alloy coating systems based on Ni-Cr-Al-X...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... the holes with no clearance in order to avoid fretting, but an interference fit may cause delamination. This problem has been alleviated to some extent by the development of several special sleeve/fastener combinations. The extreme temperature changes experienced by aircraft can cause differential thermal...
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
... to sulfidation are available, it would not be practical to replace all the transfer lines on all 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...
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
...-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 the performance...