Biomedical Engineering Reference
In-Depth Information
CH7-ST
H 2 O +
2
CO +
1
CO 2 +
0
CO 2 +
K2-ST
6
CO +
4
2
H 2 O +
0
0
200
400
600
800
1000
TEMPERATURE, o C
Figure 6.6
Temperature profiles of the main gas components released
from detonation soot of two different types: CH7-ST and
K2-ST.
TDMS study of as-received soot samples showed the release
of H
and CO as main components, as indicated in Fig. 6.6.
In addition some hydrocarbons were released in the temperature
range 200-500°C. H
O, CO
2
2,
and HCN started to be released at high
temperature above 900°C. Both the rates of release and the shapes
of the temperature profiles of different components were found to
depend strongly on the type of the soot. As a rule the TDMS profiles
consisted of several peaks and shoulders (Fig. 6.6) accounting for the
decomposition of different surface species on the soot grains. The
positions and the intensities of these peaks are quite different for
different soot samples. The total amount of volatiles released during
pyrolysis of compounds on the surface of sample K2-ST is higher than
in the case of CH7-ST. These results indicate that the structure and
the composition of surface species formed in diamond-containing
2
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