Hot-pressing of a 99.7% pure commercial silicon carbide powder with one percent boron addition has yielded a 99+% dense ceramic with 30 microns tabular grains and 50,000 psi flexural strength. A submicron particle size powder consolidated with 1% boron addition at 1950C gives 108,000 psi strength at room temperature and 64,000 psi at 1500C. Its microstructure is composed of 3.0 microns equiaxed SiC grains and less than 0.5% of free silicon forming isolated grains at the lower temperature and a grain boundary phase and intragranular inclusions at 2100C. No boron containing phase could be detected. The structure is formed by a mixture of various hexagonal poly types with the alpha-6H form prevailing.

  • Corporate Authors:

    General Electric Corporate Research & Development

    Schenectady, NY  United States 
  • Authors:
    • Prochazka, S
  • Publication Date: 1972-3

Media Info

  • Pagination: 69 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00035610
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SRD-72-035 Final Rpt
  • Contract Numbers: N00019-71-C-0290
  • Files: TRIS
  • Created Date: Oct 27 1973 12:00AM