Fracture behaviour of alumina and zirconia thin layered laminate

Hot-pressed laminated composites consisting of ZrB₂–SiC ceramic and Cf/ZrB₂–SiC composites

“…27) Furthermore, previous study in the laminated ceramic composite consisting of stronger outer layers and weaker interlayers showed that the flexural strength and fracture toughness are close to the properties of the weaker layer. 26) In the present study, the room-temperature strength of the laminated composites is close to or greater than that of the weaker layer (CfZS). Although, not well-known, it could be expected that the laminated composites should have an improved high-temperature flexural strength compared to room-temperature flexural strength by designing the stronger ZS outer layer at high temperature, and further detailed investigation is needed.…”

“…Early study in laminar material consisting of stronger outer layers and weaker interlayers with symmetrical and periodic structure showed that the weaker component is always facing stresses on the level which is very close to the level of maximal stress applied. 26) As a result, the flexural strength of the laminar material keeps the level of strength of the weaker component and only small improvement is detectable with increasing level of compressive stresses increase. Similar behavior is observed in the present laminated composites with the CfZS layers equal to or greater than 30 vol % fibers.…”

Design of alumina-zirconia composites with spatially tailored strength and toughness

“…Rather than reducing critical flaw size, a "flaw-tolerant" approach has been developed to build ceramic composites by combining layers of two different materials/microstructures in a periodic architecture with 2-2 multilayer connectivity d . [5][6][7][8][9][10][11][12][13] Two main approaches regarding the fracture energy of the layer interfaces are particularly useful, which aim to generate "weak" or "strong" interfaces. In particular, 2-2 layered composites designed with strong interfaces can present enhanced mechanical behavior through microstructural design d Connectivity is defined as the number of dimensions in which each component (e.g.…”

“…alumina-Si 3 N 4 , alumina-zirconia) under different loading configurations. 7,8,10,11 In alumina-zirconia systems, high compressive stresses in the embedded layers are developed during cooling from the sintering temperature because of the differences in thermal expansion coefficients between layers of different composition. 15 The profile of the tensile and compressive stresses can be tailored by combinations of composition, stacking sequence and layer thickness.…”

Hydroxyapatite/zirconia-microfibre composites with controlled microporosity and fracture properties prepared by electrophoretic deposition

“…It is a relatively simple and cheap method for the preparation of ceramic monoliths [16], functionally gradient materials [17], laminates [18,19] or thin films and layers [3] from a stable colloidal dispersions [20,21]. In recent years, attention has mostly been paid to the preparation of thin coatings and films of HA, α-TCP or β-TCP on ceramic or metal substrates via EPD.…”