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

Ceramics-Silikáty 49, (4) 259 - 262 (2005)


LIQUID PHASE SINTERING OF SiC WITH RARE-EARTH OXIDES
 
Balog Miroslav 1, Sedláčková Katarina 2, Zifčák Peter 3, Janega Ján 4
 
1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovak Republic
2 Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovak Republic
3 Welding Research Institute-Industrial Institute of Slovak Republic, Račianska 75, 832 59 Bratislava, Slovak Republic
4 Faculty of Materials Science and Technology, Slovak Technical University, Paulínska 14, 917 24 Trnava, Slovak Republic

Keywords: SiC, Liquid phase sintering, Microstructural development, Hardness, Fracture toughness
 

A variety of sintering additives Y₂O₃/Yb₂O₃/Sm₂O₃ together with AlN have been used for liquid phase sintering of silicon carbide. The hot pressed samples were further annealed to emphasize the effect of sintering additives on microstructural development. Remarkable influence of sintering additives on the microstructure was observed. Dependences of mechanical properties on microstructure and grain boundary chemistry were evaluated in more details. The hardness of SiC ceramics increased with decreasing ionic radius of the rare-earth elements, and contrary, the fracture toughness decreased.


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