Sintering kinetics of pure and doped boron carbide

Conference · Mon Jun 11 04:00:00 EDT 1979

OSTI ID:6037582

Lange, R G; Munir, Z A; Holt, J B

The sintering of pure and doped boron carbide was investigated over the temperature range 1898 to 2380/sup 0/K and at additive levels ranging from 0.75 to 10.0%. The addition of 0.75 and 3.8 wt% of AlF/sub 3/, Ni, Fe, and Cu deactivated the sintering of B/sub 4/C at all temperatures. In contrast, the addition of 10.0 wt% these additives resulted in enhanced shrinkage in B/sub 4/C for the temperatures 1898 and 2133/sup 0/K. At the highest temperature, 2380/sup 0/K, the addition of 10.0 wt% AlF/sub 3/ was the only case where enhanced shrinkage was observed. In this case, x-ray analysis showed the formation of a B/sub 12/C/sub 2/Al compound and the release of fluorine. These results are interpreted in terms of a grain-boundary diffusion process for pure and doped B/sub 4/C.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6037582
• Report Number(s): UCRL-82515; CONF-790682-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALUMINIUM COMPOUNDS
ALUMINIUM FLUORIDES
BORON CARBIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
COPPER
CRYSTAL STRUCTURE
DIFFUSION
DOPED MATERIALS
ELEMENTS
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
GRAIN BOUNDARIES
HALIDES
HALOGEN COMPOUNDS
IRON
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NICKEL
SHRINKAGE
SINTERING
TRANSITION ELEMENTS