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High grade powderd beryllia, obtained through decomposition of BeSO4 was used as the raw material, from which the beryllia powder compact with the density of 3.00g/cc was obtained (whereas theoretical density is 3.02g/cc). The densification has been accomplished through hot pressing in a graphite mould and the heating by induction for 30min at 1, 400°C has been performed under the pressure of 200kg/cm3 in vacuum of 10-3 mmHg. The main subject concerned was to find the best condition for the vacuum hot pressing of beryllia, and the chcracteristics of thus-prepared beryllia has been studied as well.

Some Aspect of the Vacuum Hot Pressing of High Grade Beryllia