TGO growth behaviour in TBCs with APS and HVOF bond coats

Chen, W.R.; Wu, Xijia; Marple, Basil R.; Nagy, Douglas; Patnaik, P. C.

doi:10.1016/j.surfcoat.2007.09.042

Cited by 208 publications

(76 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many researches showed that TBC failures can be correlated to the reaching of a TGO critical thickness [8,9]. Thus, producing bond coats with low TGO thickening rate can have a significant impact on the durability of TBC system [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of the isothermal oxidation resistance of CoNiCrAlY coating sprayed by High Velocity Oxygen Fuel

Fossati

Ferdinando

Lavacchi

et al. 2010

Surface and Coatings Technology

View full text Add to dashboard Cite

Two CoNiCrAlY powders with similar chemical composition and granulometry, but with different starting reactivity toward oxygen, were sprayed by High Velocity Oxygen Fuel (HVOF) onto Hastelloy X superalloy substrates obtaining coatings of comparable thickness. After spraying, samples were maintained at 1000°C in air for different test periods up to 3000 h. Morphological, microstructural, compositional and electrochemical analyses were performed onto the powders and the coated samples in order to assess the high temperature oxidation resistance provided by the different powders. The powder with higher starting reactivity toward oxygen sensibly improves the oxidation resistance of the coated samples by producing thinner and more adherent thermally grown oxide layers in comparison with the other powders.

show abstract

Section: Introductionmentioning

confidence: 99%

“…HVOF spray systems work at atmospheric pressure and consequently the investment and operation costs are much lower [11][12][13][14][15]. Recent researches showed the potentiality of HVOF spraying system compared to VPS technique [16].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the isothermal oxidation resistance of CoNiCrAlY coating sprayed by High Velocity Oxygen Fuel

Fossati

Ferdinando

Lavacchi

et al. 2010

Surface and Coatings Technology

View full text Add to dashboard Cite

show abstract

“…Em função de tais características, diversas pesquisas têm sido realizadas utilizando estes métodos de aplicação [35][36][37][38]. Os resultados são, em geral, promissores, encontrando aplicação rela em diversos segmentos.…”

Section: Desenvolvimentos Desafios E Perspectivasunclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

View full text Add to dashboard Cite

Resumo Palavras-chave: Revestimento para barreira térmica; TBC; Aspersão térmica; Metal-cerâmica. Abstract: For over four decades, thermal barrier coatings, or simply TBC, have been decisive for the performance of gas turbines in aviation and aerospace, and more recently also in the performance of power generation turbines and diesel engines. Its importance overlaps the developments achieved in the area

show abstract

“…Furthermore, the oxidation resistance of TBC is gradually reduced because of the consumption of Al and Cr in the bond coat [8]. Most research related to the oxidation resistance of TBC focuses mainly on the growth behaviors of Al 2 O 3 [9][10][11]. It is reported by Keyvani [10] that non-protective oxides are formed rapidly at the initial oxidation stage and the growth of TGO is under the diffusion control; and the effects of diffusion rate on the oxidation of Cr and Co in the Ni alloy are studied in detail by Allen [12].…”

Section: Introductionmentioning

confidence: 99%

“…It is reported by Keyvani [10] that non-protective oxides are formed rapidly at the initial oxidation stage and the growth of TGO is under the diffusion control; and the effects of diffusion rate on the oxidation of Cr and Co in the Ni alloy are studied in detail by Allen [12]. The failure of a TBC system depends on the TGO growth behaviors during the oxidation process [11]. TGO growth causes volume variation at the TC/BC interface, which results in out-of-plane stress at the interface.…”

Section: Introductionmentioning

confidence: 99%

Influences of Cr and Co on the Growth of Thermally Grown Oxide in Thermal Barrier Coating during High-Temperature Exposure

Zhang

Wang

et al. 2018

Coatings

View full text Add to dashboard Cite

Thermal barrier coating (TBC) is a critical material in the aerospace domain to increase the lifetime of gas turbine components subjected to thermal load. The properties of TBC are strongly related to the growth of thermally grown oxide (TGO) whose main constituent is Al 2 O 3 . However, the oxidation of Cr and Co can affect the growth of TGO, which is not studied sufficiently. In this paper, high-temperature exposure at 1000 • C was performed to investigate the effect of Cr and Co oxides on TGO growth. The morphology and composition analysis of the interface between the ceramic top coat and the bond coat (TC/BC) were investigated by using scanning electron microscopy (SEM) and the energy dispersion spectrum (EDS). The thermodynamics and kinetics of oxidation were analyzed. The results indicated that the oxidation kinetics basically followed the sub-parabolic law with exposure time. Additionally, the major factor affecting the formation of oxides was the diffusion rate at the initial stage of exposure, then oxides depended on thermodynamics, and the oxidation was influenced by both of them in the last stage. The major elements to be oxidized were different at different stages. Moreover, the replacement reaction of Cr 2 O 3 and the phase conversion of Al 2 O 3 resulted in thickness variations of the TGO and Al-depleted zone during high-temperature exposure.

show abstract

TGO growth behaviour in TBCs with APS and HVOF bond coats

Cited by 208 publications

References 17 publications

Improvement of the isothermal oxidation resistance of CoNiCrAlY coating sprayed by High Velocity Oxygen Fuel

Improvement of the isothermal oxidation resistance of CoNiCrAlY coating sprayed by High Velocity Oxygen Fuel

Revestimentos para barreira térmica: evolução e perspectivas

Influences of Cr and Co on the Growth of Thermally Grown Oxide in Thermal Barrier Coating during High-Temperature Exposure

Contact Info

Product

Resources

About