ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The Master Sintering Curve (MSC) is quite useful for analyzing the shrinkage behavior ofceramics. It is possible to compare shrinkage behavior using MSCs that are obtained from different firingprofiles. In this study, shrinkage behavior during sintering of green bodies of several kinds of Al2O3based ceramics were evaluated, using an electric furnace equipped with a dilatometer to be controlledbased on the MSC theory. Although all of the samples shrank monotonically, shrinkage behaviordepended 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 thepure Al2O3, a single MSC could be obtained from shrinkage curves by firing at a heating rate of7.5-20oC/min, though the shrinkage curve at a heating rate of 3-5oC/min did not correspond with theMSC. In contrast, shrinkage curves at heating rate of 5-20oC/min were converged in the case of the MgOdoped Al2O3 to obtain a unique MSC independent of firing profile. Apparent activation energy forsintering was estimated as 555 kJ/mol in the pure Al2O3 and 880 kJ/mol in the MgO doped Al2O3. Thefiring profile to obtain a requested sintering shrinkage curve was predicted from the resultant MSC. Acomparison between the predicted and the experimental shrinkage curves, showed good consistency,thus confirming that it is possible to control shrinkage behavior using the MSC
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.11.pdf
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