Current status of thermal barrier coatings — An overview

Miller, Robert A.

doi:10.1016/0257-8972(87)90003-x

Cited by 700 publications

(191 citation statements)

References 10 publications

Supporting

Mentioning

185

Contrasting

Unclassified

Order By: Relevance

“…Thermal-barrier coatings (TBCs) provide thermal protection for metallic components in hot sections of gas turbine power generation plants and aero engines (Ref [1][2][3][4][5][6]. Current use of TBCs typically allows an increase of $100-150°C in turbine entry temperature (Ref 7).…”

Section: Introductionmentioning

confidence: 99%

Properties and Performance of High-Purity Thermal Barrier Coatings

et al. 2007

View full text Add to dashboard Cite

It has been found that reducing the level of impurity oxides (particularly SiO 2 and Al 2 O 3 ) in 7YSZ, from about 0.2 wt% to below 0.1 wt% raises the sintering resistance and the phase stability of plasma-sprayed coatings. The implications for the usage of these coatings at elevated temperatures are examined. It is concluded that using relatively high-purity powder of this type is likely to confer substantial benefits in terms of the thermomechanical stability of the coatings under service conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Properties and Performance of High-Purity Thermal Barrier Coatings

et al. 2007

View full text Add to dashboard Cite

show abstract

“…This relation was then used to estimate the time necessary to produce a 7 μm thick scale of α-Al 2 O 3 (assuming a fully dense scale and theoretical density of~5.34 g/cm 3 ). This thickness value arose from correlations with failure in a number of studies [11,13,12,47], although we emphasize that it is not a strict, universal criterion, sufficient to trigger failure.…”

Section: Eb-pvd Tbc Fct Life On Nicocraly Bond Coatsmentioning

confidence: 99%

“…This has led to a deeper understanding of failure mechanisms and numerous new approaches to improve durability, as can be surmised from a number of valuable reviews [3][4][5][6][7][8][9], as well as the large body of exceptional studies from UCSB [27] (Tolpygo and Clarke), ORNL (Pint, Zhang, Haynes et al), and others cited below regarding alumina scale growth, Pt-modified aluminizing, bond coat oxidation and TBC failure mechanisms. TBC durability is often evaluated by a furnace cyclic test (FCT), having a strong oxidative component to failure.…”

Section: Introductionmentioning

confidence: 99%

Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Smialek

2015

Surface and Coatings Technology

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oFurnace cycling has been widely used to study the failure of EB-PVD thermal barrier coatings. This contribution compiles TBC furnace cyclic lives over a broad literature base to highlight optimum systems and generalized trends not always apparent in one study. Systems included typical bond coats (Pt-modified aluminides, diffused Pt-only γ/γ′, and NiCoCrAlY (± Pt, Hf) overlays) and superalloy substrates (1st, 2nd, 3rd generation single crystals, directionally solidified, or conventionally cast). Pretreatments included controlled low p(O 2 ) bond coat pre-oxidation and grit blasting (or none). The aggregate lives (~70) suggest a general trend with temperature,~10-fold decrease for every 100°C increase. Measured alumina scale thicknesses (~30) were, on average, 6.1 ± 1.8 μm at failure and independent of temperature for conventional systems. Most failures thus occurred in less time than that predicted to grow 7 μm of alumina scale (as estimated from separate TGA studies of a Ptmodified aluminide coated 2nd generation single crystal superalloy). A tentative activation energy indicated from the broad distribution of failure times was~280 kJ/mol, while that from homogeneous TGA testing was 380 kJ/mol, with regression coefficients of r 2 = 0.57 and 0.98, respectively. Published by Elsevier B.V.

show abstract

“…Due to the properties, such as high strength, chemical stability, high thermal shock resistance, advanced biocompatibility, and high fracture toughness, yttria-stabilized zirconia is very popular ceramic material with the wide range of application in science and technology [1][2][3]. They are used as oxygen sensors, thermal barrier coatings, or medical implants and prosthesis [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior and thermal expansion of zirconia–titanium composites

Łada

Miazga

Konopka

et al. 2017

J Therm Anal Calorim

View full text Add to dashboard Cite

The dilatometric and thermogravimetric methods were used to investigate the sintering conditions of 3Y-ZrO 2 and 3Y-ZrO 2 -Ti composites. For the materials preparation, the nanometric zirconia stabilized by 3 mol% Y 2 O 3 powder and micrometric titanium powder (3 and 10 vol%) were used. The green body samples were formed by slip casting method. The morphology of samples microstructures was determined by SEM observations. The stereological analysis of zirconia and zirconia-titanium composites was carried out using computer program. The density was measured using the Archimedes method. The hardness of sinters was also investigated. Addition of Ti into ZrO 2 influenced the sintering behavior and thermal expansion of obtained composites. The analysis of the sintering process and characteristic temperatures confirmed the increase of onset and final temperature of shrinkage with the increase in Ti content. The changes of the thermal expansion curves for the pure zirconia and 3Y-ZrO 2 -Ti composites were the result of the aTi ? bTi transformation and the transition temperature of the zirconia m ? t transformation. The zirconia and composite samples were characterized by relative density about 98%, close to theoretical density. The slight growth of zirconia grains was observed.

show abstract

Current status of thermal barrier coatings — An overview

Cited by 700 publications

References 10 publications

Properties and Performance of High-Purity Thermal Barrier Coatings

Properties and Performance of High-Purity Thermal Barrier Coatings

Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Sintering behavior and thermal expansion of zirconia–titanium composites

Contact Info

Product

Resources

About