Preparation of reaction bonded silicon carbide (RBSC) using boron carbide as an alternative source of carbon

S. Aroati, M. Cafri, H. Dilman, M. P. Dariel, N. Frage

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

RBSC composites are fully dense materials fabricated by infiltration of compacted mixtures of silicon carbide and carbon by molten silicon. Free carbon is usually added in the form of an organic resin that undergoes subsequent pyrolysis. The environmentally unfriendly pyrolysis process and the presence of residual silicon are serious drawbacks of this process. The study describes an alternative approach that minimizes the residual silicon fraction by making use of a multimodal particle size distribution, in order to increase the green density of the preforms prior infiltration. The addition of boron carbide provides an alternative source of carbon, thereby eliminating the need for pyrolized organic compounds. The residual silicon fraction in the RBSC composites, prepared according to the novel processing route, is significantly reduced. Their mechanical properties, in particular the specific flexural strength is by 15% higher than the value reported for RBSC composites prepared by the conventional approach.

Original languageEnglish
Pages (from-to)841-845
Number of pages5
JournalJournal of the European Ceramic Society
Volume31
Issue number5
DOIs
StatePublished - 1 May 2011

Keywords

  • Boron carbide
  • Reaction bonded silicon carbide

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