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The Combustion Synthesis of B4C-A1203-Al Composite Materials

Published online by Cambridge University Press:  25 February 2011

H. J. Feng ,
John J. Moore  and
D. G. Wirth
H. J. Feng
Affiliation:
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401
John J. Moore
Affiliation:
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401
D. G. Wirth
Affiliation:
Coors Ceramics Co., Golden, Colorado 80401
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Abstract

The combustion synthesis of the B4C-2Al203-xAl ceramic-metal composite system has been studied using the propagating mode of ignition for the reaction 2B203 + C + (4 + x)Al = B4C + 2Al203 + xAl in which x was varied between 0 and 3. The volatile constituent(s), eg. B2O3, resulted in the formation of an expanded or foamed ceramic with a uniform porous structure. The porosity represents ≥65%, and an expansion of 300-500% occurred mainly in the vertical direction. The effect of green density and reaction stoichiometry on product density, pore morphology, propagation rate and overall activation energy is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 529
Copyright
Copyright © Materials Research Society 1992

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References

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