Abstract

Diamond coating has been proposed in different patents where prosthetic joints integrate diamond-coated load bearing surfaces in order to reduce friction and to increase the useful life of the joint [1], or where diamond coatings replace plastic (such as Ultra High Molecular Weight Poly-Ethylene)/ceramic (such as Zirc-alloy) materials suitable for ginglymous, enarthrodial implants or digital joints [2]. Concerning femoral prostheses, diamond coated silicon nitride has been considered as total hip replacement material [3]. Moreover, wear-debris-induced periprosthetic bone loss and aseptic loosening are the main long-term problems for total hip replacements, and amorphous diamond (a-D) coatings could reduce the wear debris for articulating surface [4]. In alternative, multilayered nanocrystalline diamond coatings have been studied in order to improve incredible hardness and excellent wear-resistance for articulating surfaces of structural implant devices [5]. Recently, diamond like carbon (DLC) have been considered about reducing friction and wear of orthopaedic implants [6]. In this direction nano- and ultranano-crystalline diamond (NCD and UNCD) and polished poly-crystalline diamond coatings exhibiting very low roughness, could bring to better mechanical properties if compared with DLC/a-D ones. Results of recent studies on NCD coatings applied to medical implants, has shown the high diamond biocompability and positive bioactivity [7]. We propose in this work to investigate and to fabricate tailored biocompatible NCD coatings addressed to low roughness (and consequent low friction) behavior. The used technology will be based on MicroWave Plasma Enhanced Chemical Vapour Deposition (MWPECVD) technique [8], able to improve superior hardness and Young's modulus for low temperature NCD [9]. The optimized approach will be focused on the grain surface characterization and on the mechanical properties of NCD coatings grown at different deposition temperature values (650-884°C). The surface morphology will be studied by Atomic Force Microscopy (AFM) technique, and the chemical-structural features of all coatings will be analyzed by Raman spectroscopy. Some important mechanical aspects will be discussed in details.

Autore Pugliese

• Senesi Giorgio Saverio , Cicala Grazia

Tutti gli autori

• A.Massaro; L. Velardi; G. S. Senesi; G. Carbone ; G. Cicala

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2014

ISSN

Non Disponibile

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile