use of metal templates for microcavity formation in alumina
use of metal templates for microcavity formation in alumina
use of metal templates for microcavity formation in alumina
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Densification Rate (1/ o C)<br />
0,005<br />
0,004<br />
0,003<br />
0,002<br />
0,001<br />
CR6<br />
CR15<br />
CR30F<br />
CT3000SG<br />
AKP50<br />
0<br />
800 900 1000 1100 1200 1300 1400<br />
Figure 4.4. Densification rate curve <strong>for</strong> powder compacts (UP 150MPa) <strong>of</strong> alum<strong>in</strong>a<br />
CR6, CR15 CR30F, CT3000SG and AKP50 dur<strong>in</strong>g s<strong>in</strong>ter<strong>in</strong>g at a heat<strong>in</strong>g<br />
rate <strong>of</strong> 5 o C/m<strong>in</strong>.<br />
In addition to these curves <strong>for</strong> different alum<strong>in</strong>a powders, the relative shr<strong>in</strong>kage,<br />
relative density and densification rate <strong>of</strong> the CR6 alum<strong>in</strong>a powder were <strong>in</strong>vestigated at<br />
1500 o C <strong>for</strong> 1m<strong>in</strong>. Figure 4.5 shows relative shr<strong>in</strong>kage <strong>of</strong> alum<strong>in</strong>a CR6 samples at a<br />
heat<strong>in</strong>g rate <strong>of</strong> 5 o C/m<strong>in</strong> at 1500 o C. Figures 4.6 and 4.7 show relative density and<br />
densification rate <strong>of</strong> alum<strong>in</strong>a CR6 sample at a heat<strong>in</strong>g rate <strong>of</strong> 5 o C/m<strong>in</strong>.<br />
Accord<strong>in</strong>g to the results <strong>of</strong> tests <strong>of</strong> 1350 o C, the density <strong>of</strong> all alum<strong>in</strong>a powders<br />
have been <strong>in</strong>creased <strong>in</strong> the 4 hours soak<strong>in</strong>g time. However, the result <strong>of</strong> test <strong>for</strong> 1500 o C,<br />
it is noticed that the density is <strong>in</strong>creased parabolically and the densification rate <strong>of</strong> CR6<br />
is higher than the test conducted at 1350 o C.<br />
Temperature ( o C)<br />
RI RII<br />
31
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