Effect of shot peening on the oxidation behavior of thermal barrier coatings

Karaoğlanlı, Abdullah Cahit; Döleker, Kadir Mert; Demirel, Bilal; Türk, Ahmet; Varol, Remzı

doi:10.1016/j.apsusc.2015.06.113

Cited by 96 publications

(30 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results indicate that the oxide layer is suscep-tible to oxygen transition at this temperature. Similar to the findings in the literature, this study also proves that acceleration of growth of an oxide layer is not possible if samples are not exposed to much longer oxidation times [41]. The elemental analysis shows that the aluminum content in the bond coat decreased and a great majority of the aluminum penetrated into the bond coat/top coat interface, thus, thermally grown oxide layer was substantially composed of Al 2 O 3 at 1000 8C, Figure 7.…”

Section: Resultssupporting

confidence: 89%

Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel‐based superalloy

Parlakyiğit

Gülmez

Karaoğlanlı

2018

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Thermal barrier coatings are widely used in aircraft turbines to protect nickel‐based superalloys from the effect of high temperature oxidation and hot corrosion. In this study, both NiCrAlY bond coat and yttria‐stabilized zirconia top coat were deposited using atmospheric plasma spray technique. After coating production, specimens were exposed to oxidation in air atmosphere at 900 °C, 1000 °C and 1100 °C for different periods of time up to 50 h. Microstructural transformations in the ceramic top coat and growth behavior of the thermally grown oxide layer were examined using scanning electron microscopy, porosity calculation, elemental mapping and hardness measurement. Formation of different types of oxides in the thermally grown oxide layer shows that this process strongly depends on deposition technique as well as on oxidation time and temperature. Hardness values of the top coat increased with a decrease in the porosity of the top coat. Uniformity and homogeneity of the thermally grown oxide layer and densification of the top coat were evaluated in terms of the structural durability of thermal barrier coating systems.

show abstract

Section: Resultssupporting

confidence: 89%

Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel‐based superalloy

Parlakyiğit

Gülmez

Karaoğlanlı

2018

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…However, there are many studies about the oxidation of YSZ TBCs under different temperatures and times. [25][26][27]30 …”

Section: Discussionmentioning

confidence: 99%

Comparison of microstructures and oxidation behaviors of ytria and magnesia stabilized zirconia thermal barrier coatings (TBC)

Döleker¹,

Ozgurluk²,

Özkan³

et al. 2018

Mater. Tehnol.

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) provide protection to minimize aggressive environmental conditions such as oxidation, corrosion and thermal shocks occurring at high temperatures. In this study, a CoNiCrAlY metallic-bond coat was deposited on an Inconel 718 superalloy substrate with a thickness about 100 μm using the atmospheric-plasma-spray (APS) method. The production of TBCs was accomplished by depositing Y2O3 partially stabilized zirconia (YSZ) and MgO-stabilized zirconia (MSZ) as two different ceramic top-coating materials, having the total thickness of 300 μm. The specimens were subjected to a metallographic investigation before the oxidation tests; their surface roughness, porosity, hardness and microstructural properties were investigated and then compared with the results obtained after the oxidation tests. The TBC systems were subjected to isothermal-oxidation tests at 900°C and 1000°C for (8, 24, 50 and 100) h. After the oxidation tests, XRD, SEM and EDX elemental analyses were carried out and the changes in the thickness and structure of the thermally grown oxide (TGO) layer were investigated. A remarkable change occurred between the top and the bond coat in the TBC systems depending on the increasing time and temperature. The TGO layer thickness showed an increase. At the interface, Al2O3 and other mixed-oxide layers occurred. Before and after the oxidation, XRD analyses showed that YSZ had a tetragonal phase and a bit of a monoclinic phase. The MSZ coating included tetragonal, monoclinic and cubic phases at the end of the oxidation. This phase transformation causes a large volume increase in an MSZ lattice. Due to this volume increase, MSZ coatings suffer more damage than YSZ coatings. Keywords: atmospheric plasma spray, thermal barrier coatings, oxidation, ZrO2-Y2O3, ZrO2-MgO Prevleke kot termi~ne prepreke (TBCs; angl.: Thermal Barrier Coatings) zagotavljajo za{~ito pred agresivnim okoljem in zmanj{ajo oksidacijo, korozijo in termi~ni {ok zaradi obratovanja pri visokih temperaturah. V {tudiji avtorji obravnavajo kovinsko difuzijsko vezano prevleko na osnovi CoNiCrAlY, nane{eno na podlago iz superzlitine Inconel 718 debeline okoli 100 μm, ki je izdelana z metodo atmosferskega plazemskega napr{evanja (APS; angl: Atmospheric Plasma Spray). Dve razli~ni kerami~ni TBCs, celotnih debelin 300 μm, so izdelali z nana{anjem z Y2O3 delno stabiliziranega cirkonijevega oksida ZrO2 (YSZ, angl.: Yttria partially Stabilized Zirconia) in z MgO-stabiliziranega cirkonijevega oksida (MSZ; Magnesia Stabilized Zirconia). Na izdelanih vzorcih so izvedli primerjalne metalografske preiskave, pred in po oksidacijskih testih, in sicer: hrapavost povr{ine, poroznost, trdoto in mikrostrukturne lastnosti. TBC-sistema sta bila izpostavljena testom izotermalne oksidacije pri 900°C in 1000°C za (8, 24, 50 in 100) ur. Po oksidacijskih testih so izvedli XRD, SEM, EDX-elementne analize, kakor tudi ugotovili spremembe debeline in strukture termi~no zrasle oksidne plasti (TGO; angl.: Thermally Grown Oxide). Avtorji so ugotovili znatne ...

show abstract

“…3,4 The bond coat, which consist of MCrAlY (M = Ni and/or Co), is extensively applied to minimize the thermal mismatch between the superalloy substrate and the ceramic top coat. 5,6 TBCs are subject to sudden temperature changes and thermal stress during service conditions. In high-temperature applications, TBCs are adversely affected and tend to suffer because of failures such as oxidation, hot corrosion and thermal cycling/shock so that they lose structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Thermal-cycling behavior of CoNiCrAlY bonds coated with thermal barrier coatings (TBCs) produced with atmospheric plasma spraying (APS)

Kaplan¹,

Uyaner²,

Karaoğlanlı³

2017

Mater. Tehnol.

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) are commonly applied as a thermal insulation in order to protect against environmental influences in the components of high-temperature gas turbines and jet engines. Gas-turbine components are affected by aggressive conditions of the environment during the service, being subjected to failures such as corrosion, thermal shock and oxidation. Plasma-spray technology is used to produce metallic bonds and ceramic top coats as a cost-effective method to prolong the lifetime of TBCs. In the present research, CoNiCrAlY bond-coat and YSZ top-coat powders included in the TBCs were deposited onto Inconel 718 superalloy substrates using atmospheric plasma spraying (APS). The TBCs were exposed to a furnace cycling test at 1150°C and one-hour cycles. The presence of porosity and cracks facilitating the diffusion of oxygen in the top-coating structure led to the formation of thermally grown oxides (TGOs) at the interface. In addition, the most effective factors of failures were the formation and growth of mixed oxides at the bond/top-coat interface and the presence of imperfections. According to the test results, an increasing number of thermal cycles resulted in a decrease in the lifetime of the TBCs related to the sintering of the top coating due to the effect of high temperature. Keywords: thermal barrier coatings (TBCs), thermal cycling, Inconel 718 superalloy, atmospheric plasma spraying (APS), CoNiCrAlY, ytrria-stabilized zirconia (YSZ) Prevleke s toplotno pregrado (angl. TBCs) se obi~ajno uporabljajo kot toplotna izolacija, ki {~iti komponente visoko temperaturnih plinskih turbin ali reaktivnih motorjev. Na komponente plinskih turbin vplivajo agresivni vplivi okolja, katerim so izpostavljene med obratovanjem, zato pride do okvar, kot so: korozija, termi~ni {ok in oksidacija. Tehnologija plazemskega napr{evanja je cenovno ugodna tehnologija za izdelavo kovinskih in kerami~nih prevlek. V~lanku avtorji predstavljajo raziskavo v kateri sta bila na podlago iz zlitine Inconel 718 s tehnologijo plazemskega napr{evanja v zra~ni atmosferi nane{ena vezivna prevleka CoNiCrAlY in prekrivni sloj iz YSZ prahu. Izdelani prevleki sta bili nato izpostavljeni termi~nem utrujanju v pe~i pri 1150°C z ve~imi enournimi cikli. Prisotnost poroznosti in razpok olaj{a difuzijo kisika v zgornjo plast prevleke kar vodi do nastanka termi~no induciranega oksida (TGO) na povr{ini prevleke. Poleg tega sta bila najpomembnej{a dejavnika za nastanek napak tvorba me{anih oksidov na meji med vezno in vrhno plastjo ter prisotnost drugih nepravilnosti. Rezultati preizkusov so pokazali, da pove~anje {tevila termi~nih ciklov zmanj{uje dobo trajanja TBC prevlek, zaradi sintranja zgornje plasti pri povi{anih temperaturah. Klju~ne besede: prevleke s toplotno pregrado, toplotni (termi~ni) cikel, superzlitina Inconel 718, plazemsko napr{evanje, CoNiCrAlY, cirkon stabiliziran z itrijem

show abstract

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Cited by 96 publications

References 39 publications

Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel‐based superalloy

Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel‐based superalloy

Comparison of microstructures and oxidation behaviors of ytria and magnesia stabilized zirconia thermal barrier coatings (TBC)

Thermal-cycling behavior of CoNiCrAlY bonds coated with thermal barrier coatings (TBCs) produced with atmospheric plasma spraying (APS)

Contact Info

Product

Resources

About