Bioceramic Coating on Titanium by Physical and Chemical Vapor Deposition - Biological and Biomedical Coatings: Processing and Characterization - page 308

HAp (after heat treatment)

OAp (before heat treatment)

: OH _ stretch
: PO 4 3- vibration

4000 3500 3000 2000

Wavenumber, ν (cm -1 )

2500 1500 1000 500

FIGURE 7.12
FTIR spectra of OAp coatings prepared using RF magnetron sputtering on mirror-polished CP Ti substrates
before and after heat treatment at 873 K for 7.2 ks in air.

in a water-vapor containing atmosphere is required in order to obtain HAp coating, which
contains hydroxyl group.
HAp has a hexagonal structure and it is known that HAp exhibits anisotropic reactiv-
ity with human saliva (39) and also anisotropic mechanical properties. (40-42) There are some
reports that the preferentially oriented HAp can be obtained using RF magnetron sput-
tering. Figure 7.13 indicates the reported results of the peak intensity ratio of (002) and
(211) of HAp coating prepared using RF magnetron sputtering. (13,32,43-46) The preferential

7.0

Authors Ref.

6.0 van Dijk et al. 43

Wolke et al. 13

5.0 Haman et al. 45

Ding et al. 46

4.0 Nelea et al. 32, 44

3.0

2.0

1.0

HAp powder

0

0 200 400

RF power, P (W)

600 800 1000

FIGURE 7.13
Effect of RF power on intensity ratio of (002)/(211) of HAp coating prepared using RF magnetron sputtering.