Boron carbide-copper infiltrated cermets

S. Tariolle, F. Thévenot, M. Aizenstein, M. P. Dariel, N. Frumin, N. Frage

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Porous boron carbide preforms, prepared with and without excess carbon, were infiltrated with a Cu-Si alloy. Contrary to unalloyed copper, the Cu-Si alloy wets and infiltrates the porous preforms. A thermodynamic analysis of the B-C-Cu-Si system indicated that a Si content of the alloy above 15at% leads to the formation of SiC. At higher Si content, the composition of boron carbide in contact with the melt also changes towards higher boron content. Metallographic examination validated these conclusions. The SiC compound forms preferentially around the free carbon particles in preforms containing excess carbon, and also in the vicinity of carbide that did not contain any excess carbon. Eventually, SiC, a product of the reaction between the carbide and the melt, forms a continuous barrier that impedes completion of the reaction and accounts for the limited increase of hardness as a result of lengthy heat treatments.

Original languageEnglish
Pages (from-to)400-406
Number of pages7
JournalJournal of Solid State Chemistry
Volume177
Issue number2
DOIs
StatePublished - 1 Jan 2004

Keywords

  • BC-Cu cermets
  • Boron carbide
  • Infiltrated cermets
  • SiC

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