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Author Lue, L. ♦ Lai, M. O. ♦ Li, G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ COMPOSITE MATERIALS ♦ SINTERING ♦ MICROSTRUCTURE ♦ MECHANICAL PROPERTIES ♦ SILICON CARBIDES ♦ ALUMINIUM ALLOYS ♦ COPPER ALLOYS ♦ PARTICULATES ♦ GRINDING ♦ BULK DENSITY ♦ TEMPERATURE DEPENDENCE ♦ VISCOSITY ♦ FRACTURE PROPERTIES ♦ KINETICS
Abstract Sintering temperature is one of the critical parameters in the sintering of composites. It was found that the density of a sintered metal matrix composite compact at relatively lower sintering temperature could only be slightly changed. Although compaction of the matrix metal (Al-4.5wt.%Cu) could be densified from an original 70 to 96% of its theoretical density by liquid phase sintering (LPS), density of a composite compact could not be increased at the same sintering temperature. The composite compacts could be densified up to only about 91% of their theoretical density if 21.6% of liquid phase sintering was employed. The temperature employed was much higher than that used in the liquid phase sintering of its base metal. K{sub IC} measurement of the compacts revealed an increase of about 50% if high temperature sintering was used. Fracture surface analysis showed an incompletely sintered structure due mainly to high viscosity of the sintered particles. It is, therefore, suggested that the temperature for sintering metal matrix composites should be increased in order to lower the viscosity. A simple model is here proposed to predict the amount of the liquid phase needed whereby the sintering temperature can be chosen accordingly.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 31
Issue Number 5


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