Character of mass transport processes in the sintering of ultrafine powders

Effect of Temperature on the Shrinkage Rate of Compacts Composed of Nanoparticles

“…The number of nanoparticles melted in the time interval from t to t + dt can be found from the expression (2) where N ( t ) is the number of nanoparticles with a mean volume V at the instant of time t and W ( T , V ) is the probability that a nanoparticle of volume V undergoes fluctuation melting in a unit time at a temperature T of the ultradisperse powder compact. The change in the pore volume in the compact within the time interval under consideration is given by…”

“…Novikov et al [2] reported the results of the experiment on the sintering of nickel and copper ultradisperse powder compacts with a porosity of 60% and a mean particle size of 70 nm. The ultradisperse powder to be sintered was heated to a temperature of 200°C.…”