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| PROCESSING OF AL2O3/NI FUNCTIONALLY GRADIENT COMPOSITES WITHOUT MACRO-INTERFACE BY CENTRIFUGAL COMPACTION |
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Abstract A novel centrifugal compaction method was used to fabricate Al2O3/Ni functionally gradient composites without macro-interface. The slurry preparation, centrifugal compaction mechanism and mechanical properties of the composites were investigated. The results show that slurry with good fluidity can be produced when the binder content, solid content and milling time is 2wt.%, 63vol.% and 36h, respectively. Greenbodies of the Al2O3/Ni functionally gradient composites without macro-interface were fabricated by centrifugal casting (3000 r/min for 40min). Al2O3/Ni functionally gradient composites were produced by vacuum sintering at 1400 C for 2 hours. Through adjusting the solid and binder content, the composition gradient in Al2O3/Ni composites can be controlled.
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Received: 28 March 2007
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