Adhesive B-doped DLC films on biomedical alloys used for bone fixation |
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Authors: | A A Ahmad A M Alsaad |
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Affiliation: | (1) Department of Physical Sciences, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan |
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Abstract: | The long-term failure of the total hip and knee prostheses is attributed to the production of wear particles at the articulating
interface between the metals, ceramics and polymers used for surgical implants and bone-fixtures. Therefore, finding an adhesive
and inert coating material that has low frictional coefficient should dramatically reduce the production of wear particles
and hence, prolong the life time of the surgical implants. The novel properties of the non-toxic diamond-like carbon (DLC)
coatings have proven to be excellent candidates for biomedical applications. However, they have poor adhesion strength to
the alloys and biomaterials. The addition of a thin interfacial layer such as Si, Ti, TiN, Mo and Cu/Cr and/or adding additives
such as Si, F, N, O, W, V, Co, Mo, Ti or their combinations to the DLC films has been found to increase the adhesion strength
substantially. In our study, grade 316L stainless steel and grade 5 titanium alloy (Ti-6Al-4V) were used as biomaterial substrates.
They were coated with DLC films containing boron additives at various levels using various Si interfacial layer thicknesses.
The best film adhesion was achieved at 8% and 20% on DLC coated Ti-6Al-4V and grade 316L substrates, respectively. It has
been demonstrated that doping the DLC with boron increases their adhesion strength to both substrates even without silicon
interfacial layer and increases it substantially with optimum silicon layer thickness. The adhesion strength is also correlated
with the hydrogen contents in the B-DLC films. It is found to reach its maximum value of 700 kg/cm2 and 390 kg/cm2 at 2/7 and 3/6 for CH4/Ar partial pressures (in mTorr ratio) for Ti-6Al-4V and 316L substrates, respectively. |
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Keywords: | Boron-doped DLC biomedical materials adhesion strength stainless steel titanium alloys |
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