Synthesis and Characterization of Multilayered Diamond Coatings for Biomedical Implants

Abstract

With incredible hardness and excellent wear-resistance, nanocrystalline diamond (NCD) coatings are gaining interest in the biomedical community as articulating surfaces of structural implant devices. The focus of this study was to deposit multilayered diamond coatings of alternating NCD and microcrystalline diamond (MCD) layers on Ti-6Al-4V alloy surfaces using microwave plasma chemical vapor deposition (MPCVD) and validate the multilayer coating’s effect on toughness and adhesion. Multilayer samples were designed with varying NCD to MCD thickness ratios and layer numbers. The surface morphology and structural characteristics of the coatings were studied with X-ray diffraction (XRD), Raman spectroscopy, and atomic force microscopy (AFM). Coating adhesion was assessed by Rockwell indentation and progressive load scratch adhesion tests. Multilayered coatings shown to exhibit the greatest adhesion, comparable to single-layered NCD coatings, were the multilayer samples having the lowest average grain sizes and the highest titanium carbide to diamond ratios.

Severe wear behaviour of alumina balls sliding against diamond ceramic coatings

“…The aim of our present study is to know the suitability of polycrystalline diamond (PCD), if this ceramic coating can be used, for example, in hip prosthesis, instead of existing alumina ceramic. PCD coating on the acetabular cup and femoral head may replace/supplement the existing alumina materials, to prolong the implant life and also may prevent the unnecessary formation of wear debris, as harder PCD coating has very low coefficient of friction and it is chemically inert [8,9]. Biocompatibility and non-toxic effect on cells by PCD surface [10][11][12][13] also are the advantages of choosing diamond coating as a new material for future implants to get rid of the problem of tribo-corrosion [14].…”

Tribocorrosion behavior and ions release of CoCrMo alloy coated with a TiAlVCN/CN multilayer in simulated body fluid plus bovine serum albumin

“…Since the long-term durability of the prosthetic joint materials rely on the successful control of both the corrosion that produces ions release and the tribocorrosion resistance that produces ions release and oxide or plastic debris, Physical Vapor Deposition (PVD) multilayer coatings offer a multifunctional protection alternative and good adherence to metallic substrates in comparison to the monolayer coating [15,[21][22][23][24][25][26]. The multilayer combine the properties of different materials in a single protective layer.…”

Spatially Controlling Neuronal Adhesion and Inflammatory Reactions on Implantable Diamond

“…We have focused on using these deposition techniques on modified diamond and DLC, materials well known for their exceptional resistance to physical wear and chemical corrosion [49,50]. Our study has demonstrated significant neuronal adhesion with cells that maintain their characteristic morphology on both boron-doped diamond and P:DLC.…”