Spark plasma sintering of TaC-HfC UHTC via disilicides sintering aids

S. A. Ghaffari*, M. A. Faghihi-Sani, F. Golestani-Fard, H. Mandal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

Ta0.8Hf0.2C ceramic has the highest melting point among the known materials (4000°C). Spark plasma sintering is a new route for consolidation of materials, specially ultra high temperature ceramics (UHTCs), which are difficult to be sintered at temperatures lower than 2000°C.The purpose of this study is to consolidate Ta0.8Hf0.2C by spark plasma sintering at low temperature using MoSi2 and TaSi2 as sintering aid. In this regard, effect of different amounts of sintering aids and carbides ratio on densification behavior and mechanical properties of Ta1-xHfxC were investigated.Fully consolidation of Ta0.8Hf0.2C was achieved in presence of 12vol.% sintering aid after sintering at 1650°C for 5min under 30MPa. The first stage of sintering was due to plastic deformation of sintering aids particles and consequent rearrangement. The second stage was occurred via Ta1-xHfxC solid solution and liquid phase formation.

Original languageEnglish
Pages (from-to)1479-1484
Number of pages6
JournalJournal of the European Ceramic Society
Volume33
Issue number8
DOIs
Publication statusPublished - Aug 2013
Externally publishedYes

Keywords

  • Disilicides
  • HfC
  • Spark plasma sintering
  • TaC
  • UHTC

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