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By Henry H. Hausner

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2 90 IDO o Fig. 12. Green density and green strength of hydro-pressed alumina powder versus forming pressure. ",- -- 90 ,.. ;:: '"' ~60 .... "'" 30 4D -- 2 OMAT'L AS REC'D " GRANULATED ---DENSITY - - - - -STRENGTH ",- 20 -- 500 50 60 70 80 90 0 100 FORMING PRESSURE IN 1000 Iblli. Fig. 13. Green density and green strength of hydro-pressed forsterite powder versus forming pressure. 44 C. E. V AN BUREN AND H. H. HIRSCH the green properties are generally lower than those obtained with metal powders.

Coarse iron gave the highest sintered density and when not-deaired, the strength approached those obtained with fine and medium iron. Coarse tungsten was far inferior to the other powders, and the effect of not de-airing was nil. The reason is not clear for the different behavior of these two metals, but certainly particle hardness must play an important role. Alumina The results obtained with alumina in some ways quite closely matched those exhibited by tungsten. The sintered density of fine alumina (Fig.

Unlike iron, the density of the tungsten fines reached a maximum at 15,000 psi and then dropped off slowly with increasing pressure. The medium and coarse, however, showed increases of 20 and 45%, respectively, over the pressure range. It was also found that while the fines produced the lowest green density of the three grades of tungsten, it yielded the highest sintered density. The order of the medium and coarse was unchanged by sintering; the medium is still denser than the coarse, but the gap between them has widened, since the coarse did not change much upon sintering.

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