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2 2004

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Super-hard boron carbide/silicon carbide composites by reactive infiltration

Frage N., Prigozin H., Dariel M.P.

Inżynieria Materiałowa

2004

R. XXV, nr 3

278-279

Metal-ceramic composites based on B4C and SiC phases were obtain by infiltration of porous boron carbide preforms, enriched with free carbon, by silicon melt. Sugar as a precursor for free carbon was used. Porous boron carbide preforms with 35% porosity were infiltrated with sugar solution (100 gram sugar in 100 ml water). The sugar pyrolyse was performed at 500°C under argon. After the pyrolysis the preforms with 12 %wt. of free carbon were infiltrated with silicon at 1480°C under vacuum of 10^-4 torr. The resulted composites show homogeneous structure consisting of interconnected boron carbide and silicon carbide particles with 10%vol. of residual silicon. The hardness of the composites is about 2700HV and the elastic modulus is about 350GPa.

Structure and strength of carbide-steel cermet and their changes during heat treatment

Dariel M.P., Frage N.R., Kaputkina L.M., Kaputkin D.E., Sverdlova N.R.

Inżynieria Materiałowa

2004

R. XXV, nr 3

137-140

Both homogeneous and "graded" materials were produced by pressing and sintering of titanium carbide TiCx (0.7

Wytworzono jednorodne jak i "gradientowe" materiały przez prasowanie i spiekanie kształtek z węglika tytanu TiCx (0.7