Fabrication of metal matrix composites of |
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Authors: | Y Choi M E Mullins K Wijayatilleke J K Lee |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, Michigan Technological University, 49931 Houghton, MI;(2) Department of Chemical Engineering, Michigan Technological University, 49931 Houghton, MI;(3) Department of Metallurgical and Materials Engineering, Michigan Technological University, 49931 Houghton, MI |
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Abstract: | Fine fibrous titanium carbide (TiC) was processed through the self-propagating high-temperature synthesis (SHS) method and
employed to fabricate aluminum matrix composites. Two consol-idation methods were investigated: (1) combustion synthesis of
TiC fiber/Al composites directly using titanium powders and carbon fibers ignited simultaneously with varying amounts of the
matrix metal powder and (2) combustion synthesis of TiC using titanium powders and carbon fibers followed by consolidation
into different amounts of the metal matrix powder, Al,via hot isostatic pressing (HIP). In the former method, when the amount of the Al in the matrix was increased, the maximum temperature
obtained by the combustion reaction decreased and the propagation of the synthesis reactions became difficult to maintain.
Preheating was required for the mixture of reactants with more than approximately 5 mole pct aluminum matrix powders in order
to ignite and maintain the propagation rate. Microstructural analysis of the products from the Al/C/Ti reaction without preheating
shows that small amounts of an aluminum carbide phase (AI4C3) are present. In the second method, following separation of the
individual fibers in the TiC product, dense composites containing the SHS products were obtained by HIP of a mixture of the
TiC fibers and Al powders. No ternary phase was formed during this procedure.
Formerly Graduate Research Assistant, Department of Chemical Engineering, Michigan Technological University, is with Particle
Technology, Inc., Hanover, MD 21076.
This paper is based on a presentation made in the symposium “Reaction Synthesis of Materials” presented during the TMS Annual
Meeting, New Orleans, LA, February 17–21, 1991, under the auspices of the TMS Powder Metallurgy Committee. |
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