Pressure consolidation of amorphous ZrO2-Al2O3 by plastic deformation of powder particles

Densification of composite powder compacts in pressure cycling

Particle material, morphology and load effects on internal friction in powders

The effect of calcination temperature on uniaxial compaction of magnesium oxide (MgO) powders precipitated from sea water was examined. The calcination at a temperature between 900 and 1200 °C had a great influence on the compressibility of the powder and green density. Before the compaction operation, the calcined powders were ball-milled for 1.5 h. The relationship between green density obtained by uniaxial compaction and applied pressure between 50 and 200 MPa was analyzed by Niesz's equation. The agglomerate strength increased with calcination temperature. The plots of relative density versus logarithmic pressure also exhibited a break point, indicating the pressure at which the contact points in porous agglomerates started to be destroyed. Likewise, the agglomeration state of the MgO powder appeared to be remarkably affected the compressibility and green density. The changes in agglomeration states of calcined powder were observed using scanning electron microscope (SEM).

Agglomeration of magnesia powders precipitated from sea water and its effects on uniaxial compaction

Characterization of the porosity-pressure relation of cohesionless powders

Plusieurs fractions granulometriques, allant de −100/+140 a −400 mesh, de poudres de cuivre electrolytique ou reduit ont ete compactees a 1650 MPa. La densite a la pression zero du compact vert a diverses pressions a ete calculee en mettant sous forme numerique la courbe charge-deplacement et la pression d'ejection a ete determinee a partir de la charge maximale de glissement donnee par la courbe charge d'ejection-mouvement du compact. L'analyse des donnees a l'aide de l'equation de compactage de Heckel montre que trois mecanismes differents de consolidation sont en jeu dans differents domaines de pression

Paramanand

Papers

Effect of powder characteristics on compaction parameters and ejection pressure of compacts