Mixed-mode interfacial fracture toughness for thermal barrier coating

Arai, Masayuki; Okajima, Yoshifumi; Kishimoto, Kenji

doi:10.1016/j.engfracmech.2006.10.021

Cited by 42 publications

(32 citation statements)

References 17 publications

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“…It is found that the energy release rates and fracture toughness between the TC/BC interface at 1000 • C, ranges, respectively, from 22.15 J m −2 to 37.8 J m −2 , from 0.9 MPa m 1/2 to 1.5 MPa m 1/2 . These results agree with the experimental results (Arai et al 2007;Guo et al 2005;Choi et al 2005).…”

Section: Evaluation Of Energy Release Rates and Fracture Toughnesssupporting

confidence: 95%

Interfacial fracture characteristic and crack propagation of thermal barrier coatings under tensile conditions at elevated temperatures

et al. 2008

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Thermal barrier coatings (TBCs) have been extensively used in aircraft engines for improved durability and performance for more than fifteen years. In this paper, thermal barrier coating system with plasma sprayed zirconia bonded by a MCrAlY layer to SUS304 stainless steel substrate was performed under tensile tests at 1000 • C. The crack nucleation, propagation behavior of the ceramic coatings in as received and oxidized conditions were observed by high-performance camera and discussed in detail. The relationship of the transverse crack numbers in the ceramic coating and tensile strain was recorded and used to describe crack propagation mechanism of thermal barrier coatings. It was found that the fracture/spallation locations of air plasma sprayed (APS) thermal barrier coating system mainly located within the ceramic coating close to the bond coat interface by scanning electron microscope (SEM) and energy dispersive X-Ray (EDX). The energy release rate and interface fracture toughness of APS TBCs system were evaluated by the aid of Suo-Hutchinson model. The calculations revealed that the energy release rate and fracture toughness ranged, respectively, from 22.15 J m −2 to 37.8 J m −2 and from 0.9 MPa m 1/2 to 1.5 MPa m 1/2 . The results agree well with other experimental results.

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Section: Evaluation Of Energy Release Rates and Fracture Toughnesssupporting

confidence: 95%

Interfacial fracture characteristic and crack propagation of thermal barrier coatings under tensile conditions at elevated temperatures

et al. 2008

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“…On the other hands, the Al depletion can reduce the bonding strength of BC/substrate. Using biaxial fracture testing device, the propagating parallel and close to the interface between top coat and metallic bond coat were studied recently (Aria and Okajima 2007). The fracture toughness of top coat, including vertical and parallel cracks, was research in the past (Madhwal et al 2004).…”

Section: Introductionmentioning

confidence: 98%

Interfacial fracture toughness of APS bond coat/substrate under high temperature

Yang

Wang

2008

Int J Fract

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Thermal barrier coating (TBC) is an essential requirement of a modern gas turbine engine. The TBC failure is the delamination and spallation. The failure mechanism is interfacial expansion mismatch and oxidation of bond coat (BC). The oxidation damage under high temperature results in the reduction of interfacial adhesion. The interfacial fracture toughness is an important property to analyze the TBC failure. Using the simple tensile test, pushout test method and three-point or four-point-bending test and so on, the interfacial fracture toughness of ceramic top coat/BC has been researched in the past. However, the fracture toughness of the BC/substrate due to the Al depletion was very few studied. In this study, a NiCrAlY bond coat by air plasma spray (APS) was deposited. The substrate is directionally solidified superalloy (DZ40M). The Young's modulus of bond coat was obtained by the nanoindentation and average Young's modulus of bond coat is 66.9 GPa. Isothermal oxidation was performed at 1,050 • C for 100 h. Using the HXZ-1000 micro-hardness equipment and fracture mechanics approach, the five different times was chosen to test the hardness and the crack length, and then the fracture toughness was obtained. While the oxidation exposure time increased at 1,050 • C, the hardness of the substrate close to the bond coat decreased with the increase of the bond coat in hardness. Meanwhile, the interfacial fracture toughness of the bond coat-substrate decreased because of the Al depletion.

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“…(43) and (44), should be used to guide the choice of the one admissible pair of SIFs, I K and II K , from Eqs. (21) to (24).…”

Section: Relative Interfacial Displacements Behind the Crack Tipmentioning

confidence: 99%

“…(47) and (48), are determined using the orthogonal methodology [25][26][27][28][29][30][31][32][33][34]. The pure mode II (18) to (24). The only mechanically admissible pair is chosen by using Eqs.…”

mentioning

confidence: 99%

Brittle interfacial cracking between two dissimilar elastic layers: Part 1—Analytical development

Harvey

Wood

Wang

2015

Composite Structures

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Mixed-mode interfacial fracture toughness for thermal barrier coating

Cited by 42 publications

References 17 publications

Interfacial fracture characteristic and crack propagation of thermal barrier coatings under tensile conditions at elevated temperatures

Interfacial fracture characteristic and crack propagation of thermal barrier coatings under tensile conditions at elevated temperatures

Interfacial fracture toughness of APS bond coat/substrate under high temperature

Brittle interfacial cracking between two dissimilar elastic layers: Part 1—Analytical development

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