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Abstract
Changes in surface area of specimens of loose-sintered –300-mesh spherical copper powder, measured by the BET gas-adsorption technique, are given for sintering temperatures of 700,800,900, and 1000°C under furnace atmospheres of hydrogen and argon, for times of 0–24 h. Porosity determinations, using a xylene-impregnation technique, show that the porosity is composed entirely of interconnected pores at 700, 800, and 900°C, connected porosity occurring only after 14 h sintering at 1000°C. Determinations of pore-size distribution are also given, measured by a technique based on a “capillary rise of a liquid in a porous material”. Results indicate that for specimens sintered under a hydrogen atmosphere, an overall increase in pore size occurs, whereas for specimens sintered at 800 and 900°C under an argon atmosphere the size of the majority of the pores remains constant, whilst a small percentage of extremely large pores is developed. Permeability coefficients calculated from surface-area and pore-size distribution data are compared with the experimental values.
Notes
* Manuscript received 11 August 1964.