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- W2020156605 abstract "A composite fabrication method has been developed in which pressure is applied to infiltrate loose ceramic particles by liquid metal. The pressure applied has been exerted by two different techniques: centrifugal and squeeze casting. Both techniques are found to be successful in preparing Al–Al2O3 metal–matrix composites. In this method the alumina powder, followed by a rod of aluminium, is inserted into a tube which is heated to a temperature above the melting point of the alloy. In centrifugal casting the tube is rotated around an axis perpendicular to that of the tube and a centrifugal force is induced which acts on the liquid metal. In squeeze casting a squeezing force is applied to the liquid metal using a similarly heated plunger. The composite is formed by the infiltration of the liquid metal through the powder interstices under the action of the force applied. The infiltration mechanisms in both techniques are found to be different. Whilst the formation of the composite was in the direction of the squeezing force, it was in the direction opposite to the centrifugal force. However, four cases of infiltration are obtained in both techniques: no infiltration because the pressure applied is lower than the back pressure due to surface tension; partial infiltration with remaining metal above the alumina powder due to low pressing time; full infiltration due to there being sufficient metal charge and sufficient time; and partial infiltration due to an insufficient metal charge. The infiltration mechanisms in both cases are suggested in view of the application of different processing conditions, different Al2O3 particle sizes and the use of a commercial aluminium and an Al–Si alloy. The structural features of the composite, namely the particle distribution, the metal/ceramic interface and the soundness, were studied. Comparison between the structures obtained by both techniques is made. In both cases, a high volume fraction of Al2O3 ranging between 50 and 65% was obtained." @default.
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- W2020156605 date "1998-01-01" @default.
- W2020156605 modified "2023-10-16" @default.
- W2020156605 title "Metal–matrix composites fabricated by pressure-assisted infiltration of loose ceramic powder" @default.
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- W2020156605 doi "https://doi.org/10.1016/s0924-0136(97)00223-9" @default.
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