Mechanical behaviour of directionally solidified alumina/aluminium titanate ceramics

Baudin, C.; Sayir, Ali; Berger, Marie‐Hélène

doi:10.1016/j.actamat.2006.04.015

Cited by 29 publications

(24 citation statements)

References 23 publications

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“…Depending on the material composition, the grain sizes and the characteristics of the grain boundaries, microcracking might occur during cooling from sintering and/or during fracture. The adequate manipulation of the level of these stresses via microstructural design in monolithic and layered materials can lead to materials with improved flaw tolerance and/or toughness [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Reaction sintering of colloidal processed mixtures of sub-micrometric alumina and nano-titania

Nieto

Baudı́n

Santacruz

2011

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Reaction sintering of colloidal processed mixtures of sub-micrometric alumina and nano-titania

Nieto

Baudı́n

Santacruz

2011

Ceramics International

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“…It is known that several additives (e.g. MgO, Fe 2 O 3 ) may help reduce the rate of decomposition and increase the strength and conversion of Al 2 TiO 5 [3][4][5][6][7]. Of course the amount of Al 2 TiO 5 formed is influenced by the preparatory techniques, such as solid state reaction (reaction sintering or sintering of presynthesised Al 2 TiO 5 ), sol-gel processing, combusting or hot pressing [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg2+-and Fe3+-ions on formation mechanism of aluminium titanate

Korim

2009

Ceramics International

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“…In particular, there is nowadays a great effort to design and fabricate ceramic materials following the so called biomimetic approach, which consists in fabricating hierarchical structures through artificial methods mimicking natural bio-structures, which in most of the cases present a failure behaviour that significantly overcome that of the individual components (26)(27). In this sense, anisotropic materials on a macroscopic level have been developed (7,(28)(29)(30)(31)(32). Materials formed by a combination of layers of different microstructures (7,(28)(29)(30) and materials fabricated by directional solidification of compositions close to eutectic ones (31-32) offer improved behaviour in comparison with the behaviour of monolithic materials with the same microstructure as that of the constituents.…”

Section: Toughening Mechanismsmentioning

confidence: 99%

Comportamiento mecánico de materiales cerámicos estructurales

Bueno¹,

Baudı́n²

2007

Bol. Soc. Esp. Ceram. Vidr.

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The use of ceramic materials in structural applications is limited by the lack of reliability associated with brittle fracture behaviour. In order to extend the structural use of ceramics, the design of microstructures which exhibit flaw tolerance due to toughening mechanisms which produce an increase in crack growth resistance during crack propagation has been proposed. This work is a review of the mechanical behaviour of structural ceramic materials and its characterisation. Firstly, the basic brittle fracture parameters and the statistical criteria to determine the probability of exceeding the safety factors demanded for a particular application are analysed. Then, the toughening mechanisms which can be developed in the materials through microstructural design as well as the mechanical characterisation of toughened ceramics are discussed. The experimental values of linear elastic fracture toughness parameters (critical stress intensity factor, K IC , and critical energy release rate, G IC ) are not intrinsic properties for toughened materials and depend on crack length and the loading system. In this work, the different mechanical parameters proposed to characterise such materials are reviewed. The following fracture parameters are analysed: work of fracture (γ WOF ), critical J-integral value (J IC ) and R-curve. For the determination, stable fracture tests are proposed in order to ensure that the energy provided during the test is no more than the necessary one for crack propagation.Keywords: Microstructure, Strength, Weibull modulus, Fracture toughness, Toughening mechanisms. Comportamiento mecánico de materiales cerámicos estructuralesEl uso de los materiales cerámicos en aplicaciones estructurales está limitado por la falta de fiabilidad asociada a su comportamiento frágil durante la fractura. Para extender su aplicación se ha propuesto el diseño de microestructuras que presenten tolerancia a los defectos debido a la actuación de mecanismos de refuerzo. Este trabajo es una puesta al día sobre el estudio del comportamiento mecánico de los materiales cerámicos estructurales y su caracterización. En primer lugar, se revisan los parámetros de fractura utilizados para caracterizar materiales frágiles y los criterios de control estadístico que permiten determinar la probabilidad de que se sobrepasen los factores de seguridad exigidos en cada aplicación. A continuación, se discuten los mecanismos de refuerzo que se pueden desarrollar en los materiales cerámicos a través del diseño microestructural. En los materiales cerámicos en los que la actuación de mecanismos de refuerzo conduce a un comportamiento significativamente distinto del puramente frágil, los parámetros derivados del tratamiento lineal elástico (factor crítico de intensidad de tensiones, K IC , y tasa crítica de liberación de energía, G IC ), determinados experimentalmente, dejan de ser propiedades intrínsecas del material, independientes del tamaño de grieta y el sistema de carga. El presente trabajo revisa los parámetros mecánicos propuestos para...

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Mechanical behaviour of directionally solidified alumina/aluminium titanate ceramics

Cited by 29 publications

References 23 publications

Reaction sintering of colloidal processed mixtures of sub-micrometric alumina and nano-titania

Reaction sintering of colloidal processed mixtures of sub-micrometric alumina and nano-titania

Effect of Mg2+-and Fe3+-ions on formation mechanism of aluminium titanate

Comportamiento mecánico de materiales cerámicos estructurales

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