POWDER PROCESSING AND BINDER REMOVAL STUDIES FOR THE FABRICATION OF DEFECT FREE BORON CARBIDE PELLETS
Abstract
Compaction behaviour of boron carbide (B4C) has been studied by pressing the powder at different load with and without the lubrication of powder and die walls. The study was mainly focused on the optimization of powder processing, compaction, binder removal and sintering conditions. The results clearly suggest that the binder removal rate during the sintering caused the formation of cracks and pores. However, these defects have been eliminated by removing the binder before sintering. The endcapping problem of pellets was controlled by lubricating the powder and die walls. B4C pellets with required dimensions were produced using uniaxial die-compaction and pressureless sintering technique.References
J. F. Shackelford and W. Alexander, CRC Materials Science and Engineering Handbook, CRC Press, Boca Raton, Fl., 1991.
F. Thevenot, J. Euro. Ceram. Soc. 6 (1990) 205.
R.A. Murgatroyd and B.T. Kelly, Atomic Energy Rev. 15 (1977) 1.
R.M. German, Powder Metallurgy Science, Metal Powder Industries Federation Princeton, New Jersey, 1984.
R.M. German, Powder Metallurgy and Particulate Materials Processing, Princeton, New Jersey, 2005.
M. N. Rahaman, Ceramics Processing and Sintering, Marcel Dekker, New York, 1995.
W. Weimer, Thermochemistry and Kinetics, in Carbide, Nitride and Boride Materials Synthesis and Processing, Edited by Chapman and Hall, New York, 1997.
R. Angers and M. Beauvy, Ceramics Int. 10 (1984) 49.
T. Vasilos and S. K. Dutta, Am. Ceram. Soc. Bull., 53 (1974) 453.
Robert A. Thompson, Ceramics Bulletin 60 (1981) 244.
C.-Y. Wu, et al., Powder Technology 152 (2005) 107.
R.M. German, Sintering Theory and Practice, first ed., Wiley, New York, 1996.
Taylor et al., U.S. Patent No. 5720911.
Peng Chen, Gap-Yong Kim and Jun Ni, J. Mater. Processing Tech. 190 (2007) 243.
David C. Zenger and Haimain Cai, The Int. J. Powder Metall. 34 (1998) 33.
M. J. Edirisinghe, J. Mater. Sci. Lett. 10 (1991) 1338.
J. Woodthorpe, M. J. Edirisinghe and J. R. G. Evans, Polymer Removal 24 (1989) 1038.
J. Wang, S. H. P. Li and R. Stevens, J. Mater. Sci. 27 (1992) 63.
