Sintering kinetics of pure and doped boron carbide

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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 ... continued below

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Pages: 11

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Lange, R.G.; Munir, Z.A. & Holt, J.B. June 11, 1979.

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  • Lawrence Livermore Laboratory
    Publisher Info: California Univ., Livermore (USA). Lawrence Livermore Lab.
    Place of Publication: Livermore, California

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Description

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.

Physical Description

Pages: 11

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • 5. international conference on sintering and related phenomena, Notre Dame, IN, USA, 18 Jun 1979

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  • Report No.: UCRL-82515
  • Report No.: CONF-790682-3
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6037582
  • Archival Resource Key: ark:/67531/metadc1098867

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Office of Scientific & Technical Information Technical Reports

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  • June 11, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 9, 2018, 12:43 p.m.

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Lange, R.G.; Munir, Z.A. & Holt, J.B. Sintering kinetics of pure and doped boron carbide, article, June 11, 1979; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1098867/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.