Biomedical Engineering Reference
In-Depth Information
(a)
HAp/OAp
coating
film
(b)
: HAp
OAp
: OAp
: α-Ti
HAp
Ti
HAp/OAp coating film
HAp
Ti
HAp coating film
HAp
coating
film
: PO
4
3-
vibration
: OH
-
stretch
20
25
30
35
40
45
4000 3500 3000 2500 2000
1500
1000
500
2
θ
(deg)
Wavenumber,
ν
(cm
-1
)
FIGURE 7.37
(a) XRD patterns and (b) FTIR spectra of HAp and HAp/OAp coatings prepared on mirror-polished CP Ti
substrates.
Comprehensive understanding of the coating, substrate, and vapor deposition process is
needed to develop practical biomedical coatings.
In order to control the coating/substrate and human body/coating interfaces inde-
pendently, multilayered coating by vapor deposition may be useful. The preparation of
double-layered calcium phosphate coatings consisting of films with different crystallini-
ties on CP Ti substrates by RF magnetron sputtering has been reported.
(98)
The first layer
of the double-layered coating (i.e., the inner layer) was high-crystalline calcium phos-
phate, and the second layer (i.e., the outer layer) was low-crystalline calcium phosphate
OAp
HAp
Mirror-polished
CP Ti substrate
500 nm
FIGURE 7.38
TEM image of cross section of HAp/OAp coating prepared on a mirror-polished CP Ti substrate.
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