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Electrical resistivity of hot-pressed compacts

University of British Columbia

An attempt has been made to study the change in the electrical resistivity of a powder compact during the initial stages of hot-pressing. Theoretical models have been formulated on the basis of plastic deformation of spheres in a compact. The resistivity change during densification has been derived for various packing arrangements. For small deformation of spheres, the final equation is [formula omitted] and the more generalized equation for larger deformation is [formula omitted] where ơm and ơc are the conductivities of a compact of spheres having a relative density D, and at the theoretical density (D = 1), respectively. Do is the initial relative density of the compact before deformation. α is a constant depending on geometry and R is the radius of spheres at any stage of deformation in arbitrary units. The derived relationship was tested by: (a) measuring the electrical resistivity as a function of density during hot-pressing of compacts of glass spheres, (b) measuring the electrical resistivity of different compacts of nickel spheres at room temperature, and (c) comparing previous resistivity data with the theoretical equation.

Text

2011-05-16

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http://hdl.handle.net/2429/34588

Metals and Materials Engineering

University of British Columbia

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