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In the analysis of oxygen and nitrogen in raw ceramic powders by the inert gas fusion method, differences in the sampling procedure carried out by separate individuals is thought to be a primary factor in the reproducibility. We introduced a press machine for sealing nickel capsules in the sample molding process and confirmed that it was effective in decreasing these differences. Sample molding using a press machine requires pressures above 14.7 kPa. As a result of the helium purging test, it was clarified that some pressed 0.5 g capsules gave high blank values for residual air inside pressed capsules.

Improvement of Precision in Oxygen and Nitrogen Analysis of Raw Ceramic Powders