| Title |
Enhancement of the Mechanical Properties of Alumina Ceramics by a Granulation Process and Y2O3 Additive |
| Authors |
송인규(In Gyu Song); 김정식(Jung Sik Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.4.262 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
ceramics; sintering; mechanical properties; X-ray diffraction |
| Abstract |
This study investigated the effect of powder granulation on the mechanical properties of sintered alumina ceramics. 2 wt% MgO was added to enhance the sintering process, and the effect of Y2O3 addition was investigated at various sintering temperatures (1450 ℃, 1550 ℃ and 1650 ℃) with a granulation process. The sintered density, flexural strength and Vicker``s hardness were analyzed according to the amount of Y2O3 addition and the sintering temperature. The sintered density and mechanical properties of the sintered specimens with powder granulation was higher than the as-received commercial Al2O3 powders because granule powders uniformly filled the mold. The mechanical properties of strength and hardness for the sintered Al2O3 specimens increased with addition of Y2O3 up to 1 wt%, and then decreased beyond that. The 1 wt% Y2O3-added Al2O3 samples (sintered at 1650 ℃) had the maximum flexural strength of 363.53 MPa and a Vicker``s hardness of 20.1 GPa. (Received April 9, 2014) |