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Fracture alumina-based ceramics

Hardness and fracture toughness of submicron alumina-based ceramics... [Pg.60]

Table 4.1 further shows essential mechanical properties of several products of CeramTec s BIOLOX family of alumina-based materials for femoral heads of hip endoprostheses as well as those of BIONIT manufactured by Mathys Orthopadie GmbH (Bettlach, Switzerland). It is evident that decreasing the grain size of the ceramic precursor powders increases both the flexural strength and the fracture toughness of the material dramatically. [Pg.70]

Remarkable characteristics of nanocomposites observed by many researchers are summarized " Drastic change of fracture mode is observed from intergranular fracture of monolithic ceramics to transgranular fracture of nanocomposites, especially in alumina-based nanocomposites. Several mechanical properties were also improved, such as fracture strength, " " fracture toughness, " thermal shock resistance, creep resistance, " hardness, " and wear resistance." ... [Pg.596]

This latest trend in load-bearing materials for arthroplastic applications involves the development of highly fracture-resistant alumina/zirconia composites, as an alternative choice to alumina and zirconia monolithic ceramics. Composite materials are designed from both chemical and microstructural viewpoints in order to prevent environmental degradation and fracture events in vivo. Based on the experimental determination of an activation energy value for an environmentally driven tetragonal to monoclinic transformation, the long-term in vivo environmental resistance of prostheses made from these composite materials can be predicted (Chevalier et al., 2009). [Pg.359]

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See also in sourсe #XX -- [ Pg.649 , Pg.659 , Pg.663 ]



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