THE THERMAL-CONDUCTIVITY AND STRUCTURE OF POROUS, HIGHLY DISPERSED POWDER METALS COMPACTED BY COMPRESSION

Highly-dispersed metal powders are treated as structurized inhomogeneo us systems. Heat transfer in these systems proceeds mainly in accordan ce with the contact mechanism. The experimental data on the thermal co nductivity of the investigated materials are generalized on this basis . It has been shown that the bulk porosity Pi(0) is an important simil arity parameter of the structure. Assuming the fractal character of th e structure the exponent beta in the expression for thermal conductivi ty lambda = lambda(c)(1 - Pi)(2)(1 - Pi/Pi(0))beta has been estimated. It has been shown that the exponent beta is not universal for the inv estigated powders.