Damage evaluation of HAp-coated porous titanium foam in simulated body fluid based on compression fatigue behavior.

Damage evaluation of HAp-coated porous titanium foam in simulated body fluid based on compression fatigue behavior. J Mech Behav Biomed Mater. 2021 Feb 11;117:104383 Authors: Raihan MM, Otsuka Y, Tsuchida K, Manonukul A, Ohnuma K, Miyashita Y Abstract Although pure Ti is nontoxic, alloying elements may be released into the surrounding tissue when Ti alloys are used, and this can cause cytotoxicity. Therefore, this study performed the damage evaluation of hydroxyapatite (HAp)-coated porous Ti components subjected to cyclic compression in a simulated body fluid (SBF). The HAp coating layer was deposited on the surface of porous Ti by electrophoresis, and a dense and homogeneous coating morphology was observed on the surface of the porous Ti. To specify damage types of HAp coating in situ, acoustic emission (AE) measurements and microscopic observations were simultaneously conducted during compressive fatigue loading tests to detect the specific failure mode. Compression tests revealed that the interfacial strength between the HAp coating and porous Ti was higher than the yield strength of the porous body (7-9 MPa). The AE signals were detected only in the plastic deformation stage of porous Ti, which indicated that they were generated because of plastic deformation/fractures in the porous body. Compressive fatigue tests revealed that no significant HAp coating damage occurred when the applied maximum stress was within the elastic limi...
Source: Journal of the Mechanical Behavior of Biomedical Materials - Category: Materials Science Authors: Tags: J Mech Behav Biomed Mater Source Type: research