Abstract
The determination of density is an important part of quality control in PM as many other properties are influenced by porosity. Sectional densities can be determined quickly and without wasting parts with the Gamma Densomat. The suitability of this method in different stages of PM parts production, such as after compaction, sintering, sizing, impregnation, steam treating and case hardening has been tested. While measurements with a caesium radiation source are insensitive to varying chemical compositions in different production stages, the results obtained with radiation from an americium source show some sensitivity to the chemical composition. Applying density measurements to rings and cylinders, although generally restricted to flat surfaces, showed that acceptable results are obtained for larger diameters. For rings with small bore diameters correct positioning may be a problem.
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