Biomedical Engineering Reference
In-Depth Information
Figure 21.2.
Surface profi le of coated and uncoated samples (a) UHMWPE (b) DLC coated
UHMWPE (c) Ti6Al4V (d) TiN Coated Ti6Al4V (e) CP Titanium (f) DLC-coated CP Titanium. Note
that the surface fi nish of the substrate is reasonably reproduced after the coating.
21.7.3 Abrasive Wear Characteristics
Abrasive wear characteristics of the coatings were studied using a conventional
sand slurry test apparatus devised in the Institute. A specially fabricated test speci-
men is rotated in a slurry or alumina and water (1 : 1 v/v) at 3000 rpm for six-hour
duration and the volume of material lost from the surface is used as a measure of
the abrasive wear characteristics of the material (Muraleedharan et al., 1989).
The results indicate that the abrasive wear rates are higher for the coated
samples [see Figure 21.5]. This is probably due to the presence of the interface
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