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

Ghaffari, S. A ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jeurceramsoc.2013.01.017
  3. Publisher: 2013
  4. Abstract:
  5. 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
  6. Keywords:
  7. Disilicides ; Densification behavior ; Disilicides ; HfC ; Liquid phase formation ; Low temperatures ; TaC ; UHTC ; Ultra-high-temperature ceramics ; Carbides ; Hafnium ; Mechanical properties ; Spark plasma sintering ; Tantalum carbide
  8. Source: Journal of the European Ceramic Society ; Volume 33, Issue 8 , 2013 , Pages 1479-1484 ; 09552219 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0955221913000563