The second stage sintering kinetics of powder compacts

摘要: Abstract A quantitative theory is presented of second stage powder sintering kinetics. The rate calculated from the stability interconnected grain edge porosity. porosity assumed to have surfaces at equilibrium which maintain a constant contact angle with boundaries. shown depend on in turn depends upon ratio surface boundary energies. fluxes are arise not only excess vacancies but also vacancy depletion At high pore volume fractions contribution greatly exceeds that surfaces. model valid over wide range densities. geometry considered may form immedately after formation necks between particles and rounding compact. equilibrated compared data for alumina powders.