Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   December 2003 , Volume 37 , Number 3 (81); Page(s) 445 To 454.
 
Paper: 

HOT PRESSING AND MICROSTRUCTURAL STUDY OF FINE-GRAINED CARBON AND MGO DOPPED ALUMINA

 
 
Author(s):  KALANTAR M., CRAMPON J.
 
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Abstract: 

The objective of the present work was to study the preparation a fully dense MgO+C dopped alumina. The sintered materials was characterized by their microstructure and the microstructure variation during the different thermal treatment. The atmosphere is suggested to play an important role during the annealing of MgO+C dopped Al2O3. From the results it can be seen that MgO+C increased the densification rate of Al2O3 and the density is arrived very near the theoritical density. The Vaccum secondary and the absence eventually gas in the pores have been played in the densification rate. The other role of MgO+C in powder is to lower the boundary mobility which helps to keep the pores attached to the moving boundary even though the pores are controlling grain growth and not to change the grain size/density significantly. That is to say, the pesence of carbon or MgO in powder is to inhibit grain growth and to promote the development of more uniform grain structure by formation the precipitate and segregation. Because of the above roles of MgO+C in Al2O3, it is possible to arrive the theoritical density without the abnormal grain.

 
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