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Fracture Characteristics of Thermal Barrier Coatings After Tensile and Bending Tests by Y.C Zhou; T Tonomori; A Yoshida; L Liu; G Bignall; T Hashida is a Engineering article available to read on EtoBox.

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Uniaxial tension and four-point bending tests were conducted on two-layer (non-functionally graded material) plasma-sprayed rectangular specimens, boasting a new, functionally graded material (FGM) layer. The top coat layer was composed of stabilized yttria-zirconia (YSZ), and the bond coat layer was NiCrAlY. The FGM was composed of five layers: 100% YSZ; 80% YSZq 20% NiCrAlY; 60% YSZq40% NiCrAlY; 40% YSZq60% NiCrAlY; and 20% YSZq80% NiCrAlY. Fracture in the thermal barrier coating (TBC) system was examined by scanning electron microscopy (SEM), which showed that vertical multiple cracking first occurred in the top coat, followed by propagation of interface cracking between the top and bond coats. Spallation of non-FGM coatings occurred in tensileybending experiments, but not for the FGM-coated specimens, with only localized delamination observed along the interface between FGM layers and the substrate. For specimens prepared with a gun-substrate distance of approximately 120 mm and gun operating power of approximately 32.5 kW, the interface fracture toughness, evaluated by a shear lag model for the uniaxial tensile test, was 0.94 and 0.67 MPa m for type-A and -B coatings, respecti

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Author

Y.C Zhou; T Tonomori; A Yoshida; L Liu; G Bignall; T Hashida

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)