Preparation of thixotropic materials by "compocasting"
Keywords:Thixotropy, Intermetallic compound, Eutectic alloys, Particle-reinforced alloys
The thixotropic behavior of a material is associated to the coexistence of a liquid and a solid phase in suitable proportions so that the mixture does not crumble. In these conditions, the slurry is relatively insensible to shear stresses, being able to deform itself very easily. In this work, a thixotropic material formed by an alloy 63%Sn-37%Pb (which acts as the union agent or liquid phase), and a determined percentage of copper particles (which act as the solid phase) will be elaborated. This mixture is made by means of mechanical agitation at 250° C when the Sn-Pb alloy is in the liquid state. The work includes the preparation of slurries with different percentages of Cu in the interval from 10 to 50% in weight (the Cu particles being both spherical and irregular morphology). The material obtained was characterized by optical and Scanning Electron Microscope.
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