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thermal barrier coatings

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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
... 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 Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... Abstract High-temperature corrosion can occur in numerous environments and is affected by various parameters such as temperature, alloy and protective coating compositions, stress, time, and gas composition. This article discusses the primary mechanisms of high-temperature corrosion, namely...
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
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
.... The wraparound portion of the terminations coated the top land termination and “wrapped around” the ends of the substrate. No material was specified for the termination layers; however, it was specified that the wrap-around or edge terminations were to be coated with a nickel barrier layer (electroplated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... in the environment; change in the alloy or heat treatment; change in design; use of galvanic protection; use of inhibitors; use of nonmetallic coatings and liners; application of metallic coatings; use of surface treatments, thermal spray, or other surface modifications; corrosion monitoring; and preventive...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... for Thermal Barrier Coatings , Tribol. Trans. , Vol 41 , 1998 , p 399 – 410 44. Smeltzer C.E. , Gulden M.E. , and Compton W.A. , Mechanism of Metal Removal by Impacting Dust Particles , J. of Basic Eng. (Trans. ASME ), Vol 92 , Sept 1970 , p 639 – 654 10.1115/1.3425091...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
...-free water and seawater, because there is limited cathodic reaction possible. If the surface of the metal is coated with paint or other nonconducting film, the rates of both anodic and cathodic reactions are greatly reduced, and corrosion will be retarded. A corrosion inhibitor is a substance...
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 Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001341
EISBN: 978-1-62708-215-0
... Examination Visual Macrofractography Scanning Electron Microscopy Microstructural Analysis Material Coatings and Surface Layer Corrosion Deposits Hardness Analytical The tubes failed by a brittle intergranular cracking mechanism. Lead contamination was a significant factor...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... 14 , 1969 , p 241 – 248 10.1016/0043-1648(69)90048-9 42. Bruce R.W. , Development of 1232 °C (2250 °F) Erosion and Impact Tests for Thermal Barrier Coatings , Tribol. Trans. , Vol 41 , 1998 , p 399 – 410 10.1080/10402009808983765 43. Smeltzer C.E. , Gulden M.E...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
... Contact Fatigue Behavior of Thermal-Sprayed Coating: A Review , Crit. Rev. Solid State Mater. Sci. , 2019 , p 1 – 28 10.1080/10408436.2019.1671798 184. Alinia Y. , Guler M.A. , and Adibnazari S. , On the Contact Mechanics of a Rolling Cylinder on a Graded Coating, Part 1...
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
... diffusion produce intermetallic compounds (mainly aluminides), in this case NiAl Complex alloy coating systems based on Ni-Cr-Al-X, where X is an active element that promotes oxide scale adhesion Coating systems that work as thermal barriers (metal-ceramic compounds) A surface oxide of NiO...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001109
EISBN: 978-1-62708-214-3
... conducted, along with simulation tests to assess the role of alkali chlorides in the corrosion process. The basic cause of degradation was found to be hot corrosion caused by the deposition of alkali sulfates and chlorides. However this degradation may have been aggravated by thermal cycling and abrasion...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... dangerous to coat the anodic member of a couple because this may only reduce its active area, which severely accelerates the attack at these holidays in the otherwise protective coating. If inert barrier coatings are employed, both the anode and cathode must be protected. Dissimilar metals...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... imperfection. It is extremely dangerous to coat the anodic member of a couple because this may only reduce its active area, which severely accelerates the attack at these holidays in the otherwise protective coating. If inert barrier coatings are employed, both the anode and cathode must be protected...
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
... into account a (more) complete energy balance, one may find that thermal energy and mechanical energy imparted to the system combine to overcome the barrier to activation. In that case, the Arrhenius relationship may be expressed as: (Eq 7) e − ( Q − a σ H RT ) where Q...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001145
EISBN: 978-1-62708-217-4
.... There is no continuous flow within this volume and after pressurization it acts as a dead air space or thermal barrier to prevent excessive temperatures from occurring on the external surface of the dome. Cartridge combustion products can deposit between the heat shields and the chamber dome making cleaning and removal...
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 Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... not open Assembly Improper fit Improper tolerances Parts omitted Parts in wrong Parts/bolts not tight Poor alignment Imbalance Inadequate bearing contact Inadequate testing Preparation for shipment Oil system not clean Inadequate drainage Protective coating not applied Wrong coating used Equipment...