A delamination mechanism for thermal barrier coatings subject to calcium–magnesium–alumino-silicate (CMAS) infiltration

Mercer, C.; Faulhaber, S.; Evans, A.G.; Darolia, R.

doi:10.1016/j.actamat.2004.11.028

Cited by 353 publications

(162 citation statements)

References 21 publications

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“…Other elements shown in both the EDS analysis for AOI 1 and AOI 2 represented a material of the abrasive grain composed of microcrystalline Al 2 O 3 , as well as compounds contained in the vitrified glass-crystalline structure. The bond used for the construction of the grinding wheels is one of the ceramic materials of the CMAS (CaO-MgO-Al 2 O 3 -SiO 2 ) [37]. It should be emphasized that the final result of the analysis was affected by the pollution which result from the grinding process, e.g., grinding fluids [34,35].…”

Section: Resultsmentioning

confidence: 99%

SEM-EDS-based analysis of the amorphous carbon-treated grinding wheel active surface after reciprocal internal cylindrical grinding of Titanium Grade 2® alloy

Nadolny

Rokosz

Kapłonek

et al. 2016

Int J Adv Manuf Technol

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In this article, we described a detailed analysis of the composition of elements remaining on the amorphous carbon-treated grinding wheel active surface (GWAS) after reciprocal internal cylindrical grinding of Titanium Grade 2 ® alloy. For this purpose, the scanning electron microscope (SEM) combined with energydispersive X-ray spectroscope (EDS) techniques were used. The SEM imaging and observation of selected fragments of active surface of 1-35 × 10 × 10-SG/ F46G10VTO grinding wheel was mainly carried out by use of two advanced microscopy systems: JSM-5500LV (JEOL Ltd., Tokyo, Japan) and Auriga ® (Carl Zeiss Microscopy GmbH, Jena, Germany). During EDS measurements, the Octane plus (EDAX, Inc., Mahwah, NJ, USA)-a high-accuracy silicon drift detector (SSI) was used. Conducted SEM-EDS analysis shows that applied impregnation method ensure the presence of impregnate in a grinding wheel body, also in subsequent work cycles of tool. Observed Ti cloggings on the GWAS appear solely on dulled vertices of active abrasive grains, which demonstrates the limited impact of the impregnate in the zone of direct contact between abrasive grains and machined workpiece surface. However, lack of extensive cloggings of the intergranular spaces indicating an effective removal of long ductile chips of Ti from grinding zone aided by the introduction of an amorphous carbon.

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Section: Resultsmentioning

confidence: 99%

SEM-EDS-based analysis of the amorphous carbon-treated grinding wheel active surface after reciprocal internal cylindrical grinding of Titanium Grade 2® alloy

Nadolny

Rokosz

Kapłonek

et al. 2016

Int J Adv Manuf Technol

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“…A similar degradation mechanism at high operation temperatures is caused by the environmentally ingested airborne sand/ash particles melt on the hot TBC surfaces resulting in the deposition of the CMAS glass deposits (Ref [46][47][48]. At high surface temperatures, the CMAS rapidly penetrates the porosity of the coating and lead to premature failure of it as a consequence of mechanical and chemical interactions.…”

Section: Degradationmentioning

confidence: 99%

Ceramic Top Coats of Plasma-Sprayed Thermal Barrier Coatings: Materials, Processes, and Properties

2017

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The ceramic top coat has a major influence on the performance of the thermal barrier coating systems (TBCs). Yttria-partially-stabilized zirconia (YSZ) is the top coat material frequently used, and the major deposition processes of the YSZ top coat are atmospheric plasma spraying and electron beam physical vapor deposition. Recently, also new thermal spray processes such as suspension plasma spraying or plasma spray-physical vapor deposition have been intensively investigated for TBC top coat deposition. These new processes and particularly the different coating microstructures that can be deposited with them will be reviewed in this article. Furthermore, the properties and the intrinsic-extrinsic degradation mechanisms of the YSZ will be discussed. Following the TBC deposition processes and standard YSZ material, alternative ceramic materials such as perovskites and hexaaluminates will be summarized, while properties of pyrochlores with regard to their crystal structure will be discussed more in detail. The merits of the pyrochlores such as good CMAS resistance as well as their weaknesses, e.g., low fracture toughness, processability issues, will be outlined.

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“…But it undergoes significant sintering above 1200 º C, which is not desirable [4]. Furthermore, YSZ is susceptible to CMAS infiltration, which results in loss of strain tolerance and change in near surface mechanical properties leading to early coating spallation [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

Mahade

Curry

Björklund

et al. 2015

Surface and Coatings Technology

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A delamination mechanism for thermal barrier coatings subject to calcium–magnesium–alumino-silicate (CMAS) infiltration

Cited by 353 publications

References 21 publications

SEM-EDS-based analysis of the amorphous carbon-treated grinding wheel active surface after reciprocal internal cylindrical grinding of Titanium Grade 2® alloy

SEM-EDS-based analysis of the amorphous carbon-treated grinding wheel active surface after reciprocal internal cylindrical grinding of Titanium Grade 2® alloy

Ceramic Top Coats of Plasma-Sprayed Thermal Barrier Coatings: Materials, Processes, and Properties

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

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