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Comparison of ZrB₂-SiC ceramics with Yb₂O₃ additive prepared by hot pressing and spark plasma sintering

Authors:	Wei-Ming Guo Zhen-Guo Yang Guo-Jun Zhang

Affiliation:	^a Department of Materials Science, Fudan University, Shanghai 200433, China ^b State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China

Abstract:	This work compared phase composition, microstructures and mechanical properties of ZrB₂—20 vol.% SiC—5 vol.%Yb₂O₃ prepared by hot pressing (HP) and spark plasma sintering (SPS) in vacuum. Despite the same raw material composition, the two densification techniques led to the appearance of different secondary phases. The HP ceramics had coarsened microstructure, predominantly intergranular fracture characteristic and high fracture toughness. The SPS ceramics exhibited refined microstructure, transgranular fracture model and high bending strength.

Keywords:	ZrB₂-SiC Hot pressing Spark plasma sintering Microstructure Mechanical properties
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