Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 29, Issue 4, Pages 452-455Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2011.02.001
Keywords
ZrB2-SiC; Hot pressing; Spark plasma sintering; Microstructure; Mechanical properties
Funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [50632070]
- Science and Technology Commission of Shanghai [09ZR1435500]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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