electrical conductivity and vice versa. This, however, is only the case provided conduction is the dominant mechanism A simple new equation for calculating thermal and and pore conductivity is zero. This latter assumption is quite electrical conductivities of powder sintered compacts reasonable for electrical properties, whether pores are empty is proposed. In this equation, the eVective conductivity or lled with a gas, unless the voltage is high enough to of the sintered compact is a function of the solid cause dielectric rupture. For electrical properties, it can be material conductivity, the degree of compact porosity an accurate approximation if pores are empty and radiation and the packing porosity of the starting powder. The negligible, but not quite so if pores are lled with some latter parameter determines to a great extent the comuid. This is so because gases are more eYcient electrical pact pore structure, since it depends on powder particle insulators than they are thermal insulators. In any case, size, shape and distribution. The new equation is most researchers have so far relied on these assumptions, physically applicable from zero porosity to the packwhich in practice yield acceptable results provided fairly ing porosity. The conductivity equation has been low porosities and temperatures are involved. This will also evaluated using sintered compacts of iron, nickel, be the starting point here. titanium and aluminium. The compacts were prepared A number of theoretical and experimental expressions for by cold pressing and sintering. Results are in very modelling eVective thermal and electrical conductivities in good agreement with theoretical predictions.porous media have been reported. These are more or less PM/1055 complicated depending on how nely they take into account the pore structure of the material.
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