Effect of grain boundary state and grain size on the microstructure and mechanical properties of alumina obtained by SPS: A case of the amorphous layer on particle surface

The work was aimed at the investigation of kinetics Spark Plasma Sintering (SPS) α-Al2O3 particles with amorphous surface layers and effect on grain growth mechanical properties alumina. objects investigations comprised:(i) submicron powder, (ii) powder particles' surfaces, (iii) fine-grained powder. powders (i) were used to analyze sintering kinetics. Powders initial particle sizes shrinkage temperature regime rate (Vh) fine alumina has been studied. curves analyzed using Young–Cutler Coble models. shown be determined by intensity boundary diffusion for simultaneous lattice one powders. surfaces found affect migration equation parameters final stages SPS. abnormal characteristics ceramics sintered from particles’ suggested originate increased concentration defects excess free volume boundaries formed during crystallization layers.