Biotribological performance of NCD coated Si3N4-bioglass composites

resumo

A nanocrystalline diamond (NCD) coated Si3N4-bioglass composite, with potential use for hip and knee joint implants, was tribologically tested in simulated physiological fluids. NCD was deposited using a hot-filament chemical vapour deposition (HFCVD) apparatus in an Ar-H-2-CH4 gas mixture. Self-mated reciprocating experiments were performed using a pin-on-flat geometry in Hanks' balanced salt solution (HBSS) and dilute fetal bovine serum (FBS). A nominal contact pressure of 25 MPa was applied for up to 500,000 cycles. Very low friction coefficients of 0.01-0.02 were measured using HBSS, while for FBS lubricated tests the values are slightly higher (0.06-0.09), due to a protein attaching effect. AFM assessed wear rates by an approach using the bearing function for volume loss quantification, yielding wear rates of k similar to 10(-10) mm(3) N-1 in HBSS and k similar to 10(-9)- 10(-8) mm(3) N-1 m(-1) for FBS, characteristic of very mild wear regimes. (C) 2007 Elsevier B.V. All rights reserved.

palavras-chave

TOTAL HIP PROSTHESES; DIAMOND-LIKE CARBON; MECHANICAL-PROPERTIES; NANOCRYSTALLINE; FRICTION; COATINGS; CERAMICS; IMPLANT; HFCVD

categoria

Materials Science

autores

Amaral, M; Abreu, CS; Oliveira, FJ; Gomes, JR; Silva, RF

nossos autores

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