Biomedical Engineering Reference
In-Depth Information
1.0
1.0
(a)
(b)
As-sprayed HACs
HT125
HT150
0.8
0.632
0.6
0.5
0.4
As-sprayed HACs
HT125
HT150
0.2
0.0
0.0
28
32
36
40
28
32
36
40
Bonding strength (MPa)
Bonding strength (MPa)
FIGURE 6.34
(a) Failure rate function
λ
(
σ
) curves, and (b) reliability function
R
(
σ
) curves of plasma-sprayed and various
HT-HACs. These curves start from minimum strength (
σ
o
), which is the safety strength for biological applica-
tion of HACs.
(a)
(b)
L
L
S
S
ad
co
(c)
L
2 µm
S
2 µm
6 mm
FIGURE 6.35
Failure morphologies of (a) plasma-sprayed HACs, (b) HT150, and (c) HT125 specimens after tensile adhesion
tests. Bonding strength of coatings measured is a manifestation of cohesive (co) and adhesive (ad) strength. L,
loading fixture; S, substrate fixture.
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