Pressureless melt infiltrated non-oxide ceramic-metal composites


KALEMTAŞ A., Arslan G., KARA F.

Key Engineering Materials, vol.403, pp.251-252, 2009 (Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 403
  • Publication Date: 2009
  • Doi Number: 10.4028/3-908454-00-x.251
  • Journal Name: Key Engineering Materials
  • Journal Indexes: Scopus
  • Page Numbers: pp.251-252
  • Keywords: Al4C3, B4C, Pressurless infiltration, Si3N4, SiC
  • Anadolu University Affiliated: Yes

Abstract

In the present study highly dense (open porosity < 1 %), light-weight (d ≤ 2.85 g/cm3) and Al4C3-free non-oxide ceramic-metal composites were produced at comparatively low temperatures (≤ 1250°C) by pressurless melt infiltration. Phase analysis of the SiC-B 4C-Al composites revealed that a significant amount of hygroscopic Al4SiC4 and Al4C3 phases were formed. Si3N4 powder was added in different amounts to the SiC-B4C powder batches to suppress formation of these phases via in-situ reactions during the infiltration process. X-ray diffraction results of the SiC-B4C-Si3N4-Al composites confirmed that the incorporation of Si3N4 to the SiC-B4C system reduced or eliminated the formation of the hygroscopic phases and resulted in in-situ formation of AlN, SiC and Si phases in the composite.