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(a-1)
(a-2)
20 kV ×1000 10 µm 17 44 7Pa
20 kV ×1000 10 µm 17 44 7Pa
(b-1)
(b-2)
20 kV ×1000 10 µm 16 44 7Pa
20 kV ×1000 10 µm 17 44 7Pa
(c-1)
(c-2)
20 kV ×1000 10 µm 13 44 12Pa
20 kV ×1000 10 µm 14 44 11Pa
FIGURE 4.21
Typical histological changes of plasma-sprayed HA splats after 30 min (a-1 before, a-2 after) and 1 h (b-1 before,
b-2 after) incubation showing obvious dissolution. The substrate temperature is lower than 100°C. Typical his-
tological changes of HVOF-sprayed HA splats after (c) 2 h and (d, e) 3 days in vitro incubation showing remark-
able influence of incubation time and particle's melt state on the obvious dissolution (-1 before incubation, -2
after incubation). The micrographs (d, e) have the same magnification as the micrographs (c). The substrate
temperature is lower than 100°C. (From Li et al.,
Acta Mater.,
52, 445-453, 2004c. With permission.)
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