ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 59, (2) 109 - 114 (2015)


IN-SITU FORMATION AND DENSIFICATION OF MgAl₂O₄-SmAlO₃ CERAMICS BY A SINGLE-STAGE REACTION SINTERING PROCESS
 
Ma Beiyue 1, Yin Yue 1, Zhu Qiang 2, Li Ying 1, Li Guangqiang 3, Yu Jingkun 1
 
1 School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
2 School of Mechanical, Materials and Mechatronic Engineering,University of Wollongong, NSW 2522, Australia
3 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Keywords: MgAl₂O₄-SmAlO₃, Sm₂O₃, Reaction sintering, Sintering properties, Strength
 

Stoichiometric magnesium aluminate spinel (MgAl₂O₄, MA)-samarium aluminate (SmAlO₃, SA) ceramics have been prepared at 1580°C for 4 h from calcined magnesia (MgO), commercial alumina (Al₂O₃) and samarium oxide (Sm₂O₃) by a single-stage in-situ reaction sintering (SIRS) method. The phase compositions, microstructures, shrinkage ratio, bulk density and cold compressive strength of the MA-SA ceramics have been investigated. The ceramics with 2.5 - 7.5 wt.% Sm₂O₃ are composed of MA and SA phases. The microstructures of the ceramics are dense. MA particles exist as angular shape, and their grain size varies between 2 and 10 μm but the average grain size is about 5 μm. SmAlO₃ particles form due to the reaction of Sm₂O₃ and Al₂O₃, and they distribute in the intergranular space of MA grains. The diameter shrinkage ratio, volume shrinkage ratio, bulk density and cold compressive strength of MA-SA ceramics are greatly improved due to the addition of Sm₂O₃.


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