Characterization of directionally solidified B4C-SiC composites prepared by a floating zone method

Itaru Gunjishima, Takaya Akashi, Takashi Goto

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Directionally solidified B4C-SiC composites were prepared by a Floating Zone method. The lamellar texture was observed at 53 mol%SiC. The c-axis of B4C phase was tilted 20° to the growth direction. The (102) plane and [121] direction of the B4C phase were parallel to the (311) plane and [121] direction of the SiC phase, respectively. The thermal conductivity of the composite parallel to the growth direction (κ∥) was about twice as great as that of monolithic B4C. The anisotropy of electrical conductivity and thermal conductivity were explained by a mixing law using the values of B4C and SiC. The mass gain due to oxidation was about 1/3 to 1/5 less than that of monolithic B4C at 1023 K. The surface perpendicular to the growth direction showed slightly better oxidation resistance than that parallel to the growth direction. The microhardness of the composite was almost the same as that of B4C.

Original languageEnglish
Pages (from-to)2309-2315
Number of pages7
JournalMaterials Transactions
Volume43
Issue number9
DOIs
Publication statusPublished - 2002 Sep

Keywords

  • Boron carbide
  • Directional solidification
  • Electrical conductivity
  • Eutectic
  • Floating zone
  • Hardness
  • Oxidation resistance
  • Silicon carbide
  • Thermal conductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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