Silicon nitride based ceramic composites toughened by rare-earth oxide additives
P. Tatarko1,2; M. Kašiarová1 1 Slovak Academy of Sciences, Košice, Slovak Republic2 Queen Mary University of London, London, UK
Abstract
This chapter describes the microstructure development of Si3N4 and the role of the rare-earth elements in the processing and the microstructure evolution of Si3N4 monoliths and Si3N4–SiC composites. The chapter also summarizes the effect of rare-earth oxide additives on the fracture toughness of Si3N4 materials via a microstructure design as well as the properties of the residual glassy phases at the Si3N4 grain boundaries. Moreover, the significant effect of the rare-earth oxides on the in situ formation and distribution ...
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