Paper Title:
Sintering of B4C-SiC Powder Obtained In Situ by Carbothermal Reduction
  Abstract

Boron carbide (B4C) and silicon carbide (SiC) are materials with high hardness and low density what make them very useful in various applications, such armor plates. Hot press sintering of B4C-SiC composites was studied. The powder mixture was obtained in situ by carbothermal reduction using B2O3, SiO2 and carbon black as precursors. Seeds of commercial B4C and SiC were used to accelerate the synthesis reaction. Compositions were prepared to obtain powders after carbothermal reduction with 10, 30 and 50 wt% of SiC. Carbothermal reaction was conducted in argon atmosphere at temperatures up to 1700 °C. The synthesized powders were analyzed by DRX and SEM. Hot pressing at 1850 °C/30 min (20 MPa) in argon atmosphere was applied. Densities higher than 93% of theoretical density and microhardness of 34 GPa were achieved for hot pressed samples.

  Info
Periodical
Materials Science Forum (Volumes 591-593)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
493-497
DOI
10.4028/www.scientific.net/MSF.591-593.493
Citation
R. M. da Rocha, F. C. L. de Melo, "Sintering of B4C-SiC Powder Obtained In Situ by Carbothermal Reduction", Materials Science Forum, Vols. 591-593, pp. 493-497, 2008
Online since
August 2008
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$32.00
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