Kinetics of Sintering of Sodium Chloride in the Presence of an Inert Gas

摘要

Sintering of Sodium chloride at 700 to 800°C in an inert gas atmos¬phere occurs by an evaporation-condensation mechanism with the rate-controlling step in the material transport process assumed to be diffusion of sodium chloride vapor through a thin boundary layer adjacent to the condensing surface. Solutions for the rate law governing the sintering process and a scaling law, both calculated under the foregoing assumption, are in good agreement with the experimental observations of interface growth. The marked pressure-dependence of the empirical relationship between contact area and sintering time at a fixed temperature and particle size is also consistent with the assumption that the rate is governed by diffusion of the condensing species through a boundary layer.