Computational prediction of novel MAB phases

Carlsson, Adam

doi:10.3384/9789179293819

Cited by 1 publication

(2 citation statements)

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“…Alumina formation changes to mixed oxide formation consisting of Cr, Ni, Co, Al) due to depletion in Al. Growth rate for mixed oxide is higher than alumina [21]. It is confirmed that thermal cycling up to 500 cycles TGO is made of pure alumina, while the internal oxide in BC consists of both alumina and spinels.…”

Section: Crack Length Vs Tgo Thicknessmentioning

confidence: 52%

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Damage Assessment and Fracture Resistance of Functionally Graded Advanced Thermal Barrier Coating Systems: Experimental and Analytical Modeling Approach

Amarnath¹,

Patnaik

Chen

2020

Coatings

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Enhancement of stability, durability, and performance of thermal barrier coating (TBC) systems providing thermal insulation to aero-propulsion hot-section components is a pressing industrial need. An experimental program was undertaken with thermally cycled eight wt.% yttria stabilized zirconia (YSZ) TBC to examine the progressive and sequential physical damage and coating failure. A linear relation for parameterized thermally grown oxide (TGO) growth rate and crack length was evident when plotted against parameterized thermal cycling up to 430 cycles. An exponential function thereafter with the thermal cycling observed irrespective of coating processing. A phenomenological model for the TBC delamination is proposed based on TGO initiation, growth, and profile changes. An isostrain-based simplistic fracture mechanical model is presented and simulations carried out for functionally graded (FG) TBC systems to analyze the cracking instability and fracture resistance. A few realistic FG TBCs architectures were considered, exploiting the compositional, dimensional, and other parameters for simulations using the model. Normalized stress intensity factor, K1/K0 as an effective design parameter in evaluating the fracture resistance of the interfaces is proposed. The elastic modulus difference between adjacent FG layers showed stronger influence on K1/K0 than the layer thickness. Two advanced and promising TBC materials were also taken into consideration, namely gadolinium zirconate and lanthanum zirconate. Fracture resistance of both double layer and trilayer hybrid architectures were also simulated and analyzed.

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Section: Crack Length Vs Tgo Thicknessmentioning

confidence: 52%

“…Presence of mixed oxides consisting of chromia and spinels in TGO was reported earlier when thermally exposed in air. In absence of mixed oxides in low oxygen pressure, TBC is reported to have a longer lifetime [21][22][23]. The mixed oxides facilitate easy crack nucleation due to volumetric expansion of TGO.…”

Section: Tgo Thickness and Crack Lengthmentioning

confidence: 99%