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 />
0,0069<br />
0,0059<br />
0,0049<br />
0,0039<br />
0,0029<br />
0,0019<br />
0,0009<br />
-0,0001<br />
CR15-Ti<br />
CR30F-Ti<br />
CR6-Ti<br />
Figure 4.25. Densification rate curve <strong>for</strong> powder compacts (UP 150MPa) <strong>of</strong> alum<strong>in</strong>a<br />
CR6-Ti, CR15-Ti and CR30F-Ti that <strong>use</strong>d titanium wire, dur<strong>in</strong>g s<strong>in</strong>ter<strong>in</strong>g<br />
at a heat<strong>in</strong>g rate <strong>of</strong> 5 o C/m<strong>in</strong>.<br />
Figure 4.26 shows SEM micrographs <strong>of</strong> the CR6, CR15 and CR30F alum<strong>in</strong>a<br />
samples that <strong>use</strong>d Ti wire. Accord<strong>in</strong>g to Figure 4.26, all <strong>of</strong> the samples had porosity <strong>in</strong><br />
alum<strong>in</strong>a and the CR15 alum<strong>in</strong>a samples have crack. As <strong>in</strong> Figure 4.15, the titanium wire<br />
is still present <strong>in</strong> the alum<strong>in</strong>a. Titanium proceeded <strong>in</strong> alum<strong>in</strong>a approximately 100µm at<br />
1350 o C <strong>in</strong> 4 hours <strong>of</strong> soak<strong>in</strong>g time.<br />
0 150 300 450 600 750 900 1050 1200 1350<br />
Temperature ( o C)<br />
47
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