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the start of the heating period, which is observed in every other experiment. The second<br />
exotherm starting at approximately the 800 th second is accompanied by a pressure drop.<br />
The percent hydrogen versus corrected time plot given in Figure 27 (b) and that of<br />
hydriding with pure H 2 (a) indicates approximately 0.2 % H is absorbed. In the presence<br />
of helium, hydriding occurs in one step similar to the case of pure hydrogen however,<br />
both the rate of uptake and terminal capacity of hydrogen in VTiNi are reduced.<br />
DSC 111<br />
Heat Flow/mW<br />
45<br />
Exo<br />
40<br />
Figure: Experiment:MTO VTiNi 2nd hydr 50 % H2 He 20050320_3 Crucible:Steel<br />
Atmosphere:H2<br />
20/03/2005 Procedure: 50 % H2-He (hydriding) (Zone 1)<br />
Mass (mg): 282.6<br />
Sample temperature/°C<br />
140<br />
35<br />
30<br />
120<br />
25<br />
20<br />
100<br />
15<br />
10<br />
80<br />
5<br />
0<br />
60<br />
-5<br />
40<br />
-10<br />
-15<br />
20<br />
-20<br />
0 250 500 750 1000 1250 1500 1750 2000 2250<br />
Time/s<br />
Figure 26: Thermogram of VTiNi hydrided with 50% (v/v) H 2 -He mixture.<br />
61
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