Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 11, Pages 2087-2092Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.03.015
Keywords
Nanoceramics; Two-step sintering (TSS); Densification; Grain growth
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Funding
- Swedish Research Council [621-2008-5730]
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Two-step sintering (TSS) concept was adopted in the consolidation of 3 mol% yttria doped zirconia nanopowder. Partially densified bodies with 87% theoretical density (TD) were firstly prepared using high-pressure spark plasma sintering (SPS) technique and followed by second-step pressureless sintering. The samples achieved only 96% TD final density after 30 h soaking. It was found that the densification process was impeded by dynamic pore coalescence with a pore growth factor of 10. The phenomenon was explained by the coalescence of interconnected small pores generated by differential sintering of nanoceramic green compacts. Such pore coalescence was accompanied with particle movement, which resulted in sintering state deviating from the frozen state. Present results indicated that the active range for particle rearrangement was greatly extended during nanoceramic sintering and the efficiency of TSS approach was greatly dependent on the homogeneity of green bodies. (C) 2013 Elsevier Ltd. All rights reserved.
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