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J Mech Behav Biomed Mater. 2016 Feb;54:328-45. doi: 10.1016/j.jmbbm.2015.09.036. Epub 2015 Oct 22.

Surface toughness of silicon nitride bioceramics: I, Raman spectroscopy-assisted micromechanics.

Author information

1
Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8126 Kyoto, Japan. Electronic address: pezzotti@kit.ac.jp.
2
Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8126 Kyoto, Japan.
3
AMEDICA Corporation, 1885 West 2100 South Salt Lake City, UT 84119, USA.

Abstract

Indentation micro-fracture is revisited as a tool for evaluating the surface toughness of silicon nitride (Si3N4) bioceramics for artificial joint applications. Despite being unique and practical from an experimental perspective, a quantitative assessment of surface fracture toughness using this method is challenging. An improved method has been developed, consisting of coupling indentation with confocal (spatially resolved) Raman piezo-spectroscopy. Empowered by the Raman microprobe, the indentation micro-fracture method was found to be capable of providing reliable surface toughness measurements in silicon nitride biomaterials. In designing the microstructures of bioceramic bearing couples for improved tribological performance, surface toughness must be considered as a fundamentally different and distinct parameter from bulk toughness. The coupling of indention crack opening displacements (COD) with local stress field assessments by spectroscopy paves the way to reliably compare the structural properties of bioceramics and to quantitatively monitor their evolution during environmental exposure.

KEYWORDS:

Bioceramics; Confocal Raman piezo-spectroscopy; Crack bridging; Indentation crack opening displacement; Si(3)N(4); Surface toughness

PMID:
26522613
DOI:
10.1016/j.jmbbm.2015.09.036
[Indexed for MEDLINE]

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