Biomedical Engineering Reference
In-Depth Information
12.1
SEM microphotograph (BSE image) illustrating the lamellar
structure of Cu-Al/Al
2
O
3
composite powder following aluminothermic
reaction with Cu
2
(OH)
2
CO
3
at the first stage of reactive milling. The
darker network corresponds to a higher amount of Al
2
O
3
, the brighter
one to a higher content of Cu-Al intermetallics (SEM Hitachi S-4700 with
EDX Noran Vantage) (Wieczorek-Ciurowa
et al.
, 2005).
Table 12.1 Results of EDX elemental microanalysis of the composite powder
synthesized by milling a Cu
2
(OH)
2
CO
3
-Al
2
O
3
mixture, from the corresponding
SEM microphotograph (BSE image) in Fig. 12.1
Concentration/mass (%)
Point
Cu
O
Al
BSE image
1
32.7
30.1
37.2
Dark grey
2
39.0
25.5
35.5
Grey
3
47.2
22.2
30.6
Light grey
4
38.4
25.3
35.5
Grey
5
23.3
32.6
44.1
Dark grey
Source: Wieczorek-Ciurowa
et al.
, 2005.
reactions occur. This is a stage of mechanochemical synthesis that can occur
in two different kinetic ways:
.
a reaction that develops slowly with each collision, which results in a
gradual transformation of the substrates
