The role of residual stresses in layered composites of Y–ZrO2 and Al2O3

Tomaszewski, Henryk; Strzeszewski, J.; Gȩbicki, W.

doi:10.1016/s0955-2219(98)00189-7

Cited by 30 publications

(12 citation statements)

References 14 publications

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“…L AMINATES have received considerable attention in the past few years, [1][2][3][4] due to their high damage tolerance and reliability relative to brittle monolithic ceramics. Two types of main laminated structures existed in previous investigations: ceramic/ceramic laminates [5][6][7][8][9][10][11][12][13] and metal/ceramic laminates. 14 -18 The reinforcing mechanism in ceramic/ceramic laminates is the arrest of crack propagation at the interface between the ceramic layers such that no catastrophic failure occurs.…”

Section: Introductionmentioning

confidence: 99%

Model Analysis of Multicrack Mechanisms in Ceramic/Superplastic Laminates

Deng

Zhang

Ando

et al. 2002

Journal of the American Ceramic Society

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Previous experimental results showed that a ceramic/superplastic laminate exhibited multiple cracking in ceramic layers during a three‐point bending test. In this work, a model analysis has been developed based on bending theory. It reveals that there are two basic processes that occur after a ceramic layer fractures: one is a relaxation process of the residual stress in the ceramic layer, due to the confinement by the superplastic layers; the other is a shear process of superplastic flow, which originates from the difference in strain rate between the fractured and unbroken ceramic layers. The total stress in an as‐fractured ceramic layer is the sum of the residual stress and a shear‐accumulated stress, depending on time. When the total stress at a critical distance from the fractured surface exceeds the fracture strength of a ceramic layer, new cracking occurs. There is a critical roller speed below which no multiple cracking occurs, depending on specimen dimensions and material properties. The number of multicracks in one ceramic layer decreases with the progress of the fracture in the laminate, due to the decrease in shear‐accumulated stress. The theoretical predications are in good agreement with the experimental results. Moreover, the variations in fracture energy of the laminate due to the multiple cracking are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Model Analysis of Multicrack Mechanisms in Ceramic/Superplastic Laminates

Deng

Zhang

Ando

et al. 2002

Journal of the American Ceramic Society

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“…In previous studies on co‐sintering of alumina and zirconia, effects of thickness and layer structure on crack formation were reported. Typically, cracks resulting from sintering mismatch have wider openings and rounded crack edges.…”

Section: Introductionmentioning

confidence: 99%

Co‐sintering Zirconia Electrolyte and Insulator Tapes for Sensor Applications

Li¹,

Feingold²,

Palanisamy³

et al. 2012

J. Am. Ceram. Soc.

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Multilayer co-sintered ceramics (HTCC or LTCC) are widely used for planar sensors (such as gas sensors for oxygen, hydrogen, hydrocarbon, carbon monoxide, as well as, NOx, etc.) as well as solid oxide fuel cells, and other special applications such as high-temperature batteries and transformers for deepwell drilling. Ceramic tapes with different sintering behaviors can be modified so they can be co-sintered to build multilayer devices. One of the main challenges in building these devices is the co-sintering of a dissimilar material structure. In this study, co-sintering of yttria stabilized zirconia and insulator tapes was studied. Their sintering behaviors were modified so that the effects of sintering shrinkage and sintering rate could be separated from coefficient of thermal expansion (CTE) effects. It was found that "co-burnout" has a strong effect on the delamination and cracking of the multilayer structures built with these dissimilar materials. The layer configuration in the co-sintering structure also plays a strong role in determining the tolerance for sintering (sintering shrinkage and sintering rate) mismatch. The CTE and the sintering behavior of insulator tapes were modified to match those of zirconia tapes. Cosintering behavior of the modified insulator and zirconia tapes was examined. The effect of sintering mismatch on camber in multilayer structures is also discussed.

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“…Toughness improvements have been achieved by the addition of metal layer reinforcements [1][2][3], the addition of different ceramic composition layers which modify the residual stress distributions within the composite [4][5][6][7], and by modifying the microstructure [8,9]. Additionally, the influence of layer structures on the fracture properties is dependent on the configuration of the crack extension direction with respect to the layer orientation.…”

Section: Introductionmentioning

confidence: 99%

“…The studies which have investigated the influence of a particular layer structure on the fracture of composite has primarily used the arrester configuration [2,[4][5][6][7][8][9][10]. The variations in microstructure, composition, and residual stress within layered composites have been shown, in the arrester configuration, to modify the fracture behavior such that the measured stress intensity factor, K R , and the R-curve behavior are dependent on the location within the composite, as experimentally demonstrated in the studies by Lakshminarayanan et al [5], Marshall et al [8,10] and Moon et al [9,11,12].…”

Section: Introductionmentioning

confidence: 99%