Structure and durability evaluation of YSZ+Al2O3 composite TBCs with APS and HVOF bond coats under thermal cycling conditions

Karaoğlanlı, Abdullah Cahit; Altuncu, Ekrem; Özdemir, İ.; Türk, Ahmet; Üstel, Fatih

doi:10.1016/j.surfcoat.2011.04.081

Cited by 70 publications

(27 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Typically, a TBC system consists of bond coat (MCrAlY) and top coat (YSZ) above a super alloy substrate. MCrAlY (M = Ni and/or Co) is widely used to provide a good thermal expansion match between the top coat and substrate [5,6]. Bond coat does not only provide better adhesion and bonding to top coat and substrate but also provides protection against oxidation and hot corrosion while top coat provides good thermal insulating [7].…”

Section: Introductionmentioning

confidence: 99%

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

Karaoğlanlı

Döleker

Demirel

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

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

Karaoğlanlı

Döleker

Demirel

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

“…The BC must be able to provide corrosion resistance by the formation of a thermally grown oxide (TGO). The TGO must be consisting of a stable phase for the adhesion of the ceramic layer of thermal insulation [5,6]. Nickel based superalloys like NiCrAlX and/or NiCoCrAlX, have emerged as alternative bond coats [7] due to their high chemical compatibility with the superalloy used as substrate, that allows a good adhesion substrate-coating, and to their compatibility in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution of mechanically alloyed Ni-based alloys under high temperature oxidation

et al. 2015

View full text Add to dashboard Cite

“…[4][5][6][7] The TBCs consist of a heat-resistant ceramic top coating, a metallic bond coat on superalloy substrates and a thermally grown oxide (TGO) layer formed at the interface of the metallic bond and ceramic top coating during a high-temperature oxidation. 3,[8][9][10] The bond coat generally protects superalloy substrates from excessive oxidation and corrosion and also provides an adhesive surface for the ceramic top coat in these systems. The ceramic top coat is mainly used for thermal insulation and some additional corrosion and oxidation resistance in TBC systems.…”

Section: Introductionmentioning

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

Structure and durability evaluation of YSZ+Al2O3 composite TBCs with APS and HVOF bond coats under thermal cycling conditions

Cited by 70 publications

References 18 publications

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

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

Microstructural evolution of mechanically alloyed Ni-based alloys under high temperature oxidation

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

Contact Info

Product

Resources

About