Control of Shrinkage during Sintering of Alumina Ceramics Based on Master Sintering Curve Theory |
| Journal |
Key Engineering Materials (Volumes 317 - 318) |
| Volume |
The Science of Engineering Ceramics III |
| Edited by |
T. Ohji, T. Sekino and K. Niihara |
| Pages |
11-14 |
| DOI |
10.4028/www.scientific.net/KEM.317-318.11 |
| Online since |
August, 2006 |
| Authors |
Junichi Tatami,
Y. Suzuki,
Toru Wakihara,
Takeshi Meguro,
Katsutoshi Komeya
|
| Keywords |
Aluminum, Master Sintering Curve, Shrinkage |
| Abstract |
The Master Sintering Curve (MSC) is quite useful for analyzing the shrinkage behavior of
ceramics. It is possible to compare shrinkage behavior using MSCs that are obtained from different firing
profiles. In this study, shrinkage behavior during sintering of green bodies of several kinds of Al2O3
based ceramics were evaluated, using an electric furnace equipped with a dilatometer to be controlled
based on the MSC theory. Although all of the samples shrank monotonically, shrinkage behavior
depended on the additive and heating rate. The MSC theory was applied to analyze shrinkage behavior.
As a result, a different MSC could be obtained in Al2O3 with and without the addition of MgO. In the
pure Al2O3, a single MSC could be obtained from shrinkage curves by firing at a heating rate of
7.5-20oC/min, though the shrinkage curve at a heating rate of 3-5oC/min did not correspond with the
MSC. In contrast, shrinkage curves at heating rate of 5-20oC/min were converged in the case of the MgO
doped Al2O3 to obtain a unique MSC independent of firing profile. Apparent activation energy for
sintering was estimated as 555 kJ/mol in the pure Al2O3 and 880 kJ/mol in the MgO doped Al2O3. The
firing profile to obtain a requested sintering shrinkage curve was predicted from the resultant MSC. A
comparison between the predicted and the experimental shrinkage curves, showed good consistency,
thus confirming that it is possible to control shrinkage behavior using the MSC. |
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