Abstract
Most materials will expand upon heating, while rare ones contract. Such negative thermal expansion materials have great potential in controlling thermal expansion composites. Squeeze casting was used to fabricate fully dense 60 vol.-%Y2W3O12/Al composite in this study. The results showed that negative thermal expansion Y2W3O12 was not reacted with Al due to advantage of squeeze casting fabrication. Upon coefficient of thermal expansion (CTE) test, the composites showed the CTE is significantly larger than predicted from theory. Different sizes of particles were chosen to fabricate high volume ceramic reinforced metal matrix. The thermal expansion of composite shows complex transition with the change of temperature. On the basis of X-ray diffraction, some peak vanishing in composite is shown to result from the thermal mismatch stress between matrix and reinforcement.
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