It is interesting to note that many colloidal oxides and other fine particles become electrically charged when they are dispersed in aqueous systems. In wet grinding the rheological and colloid – chemical behaviour of the particles is very important with respect to process flow and the material properties.
The ground suspensions were dried by evaporation of the grinding liquid in a drying cabinet at a constant temperature of 80%.C. The dried batch powder were sieved and compacted by using axial pressing followed with isostatic pressing. The pressed green specimens were pre sintered at 1600.C for an hour in an electrically heated furnace.
The pre sintered specimens were once again pressed in a hot isostatic press at 1550.C for an hour in argon gas atmosphere. The specimens were machined further and finished by grinding to study properties.
To be contd…..
