Mechanical properties of biomorphous ceramics

Abstract

Abstract. Mechanical properties: The Vickers hardness and bending strength of porous biomorphic SiC (bioSiC) ceramics fabricated from different natural hardwoods were investigated. It has been found that these parameters are highly dependent on the geometrical densities of ceramics, and Vickers hardness values can be well described using the Ryskevitch-type equation. It has been shown that the data of geometrical density bio-SiC ceramics can be used to estimate mechanical parameters such as bending strength. Materials with advanced properties appropriate for surgical applications are being designed. Further ways to improve the mechanical properties of ceramics and ceramic products have been discussed.

Porous biomorphic silicon carbide ceramics coated with hydroxyapatite as prospective materials for bone implants

“…The density of such ceramics can be tuned in a wide range from 1.15 g/cm 3 to 2.6 g/cm 3 [16,36], which is significantly closer to the material density of cortical bone (1.5-2.0 g/cm 3 ) rather than that of titanium alloys (4.43-4.50 g/cm 3 ) [37]. As an intrinsic property, the porosity of final ceramics as well as pore size can vary from 20% to 90% and 5 μm to 500 μm, respectively [10][11][12][13]18,21,39,40] and depends on the properties of initial wood source, such as its age and type (soft or hard wood) [38]. This makes the SiC ceramics an excellent candidate for substitution of dense and less porous cortical bone (porosity 5-30%) rather than cancellous bone (porosity 30-90%) [36,41].…”

“…This makes the SiC ceramics an excellent candidate for substitution of dense and less porous cortical bone (porosity 5-30%) rather than cancellous bone (porosity 30-90%) [36,41]. Moreover, biomorphic SiC ceramics can be customized during the synthesis and the desired mechanical properties can be adjusted by varying initial wood source, amount of Si removal, temperature of synthesis and a number of impregnation cycles [17,39]. Although the synthesized low weight SiC ceramics possess a range of advantages, they are not bioactive and thus unable to accelerate bone remodeling requiring deposition of bioactive HA-based coatings [27].…”

Carbon ceramics from plants: Graphitization of biomorphic matrixes

“…Pyrolysis of plants and seeds [1] depending on the process temperature [2] provides with a wide range of materials having various properties. Being obtained from various species of plants and seeds, they are a promising basis to replace carbon fillers, threads and tissues in production of composite heat-resistant and heat-stressed materials, chemical and thermoelectric current source electrodes, catalytic carriers, catalytic supporters, filters and sorbents.…”