Abstract
Fabrication of metal matrix composites by infiltration of preforms with liquid metals is currently attracting much interest as a production route. In order to prevent the formation of defects in the cast structure, complete melt penetration is necessary. An analysis is presented which indicates that this is not possible in systems where the fibres are touching and the solid-liquid contact angle is greater than 90°. The meniscus configuration in the contact zone can be modelled, and defect sizes in cases of practical interest are estimated. The effect of infiltration pressure, residual gas pressure, contact angle, fibre radius and separation are considered. The results of a calculation of cohesive forces developed between the fibres during infiltration are given and the significance of these forces is discussed. The application of the meniscus configuration model to the measurement of interfacial contact angles is demonstrated.
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