不活性ガス融解法によるアルミニウムおよびアルミニウム合金粉中の酸素定量

Abstract

The determination of oxygen in powder of aluminum and its alloy by the inert gas fusion method has been investigated. The apparatus was equipped with an impulse furnace using nitrogen as a carrier gas. Nickel foil was used as a metal bath, and the comparison study between a metal bath method and a graphite capsule method using together with a nickel foil metal bath was performed.In the analysis of aluminum powders, three times of the amount of nickel foil as many as that of a sample were used and a gas extraction temperature was 2173 K. This technique was compared with the graphite capsule method in which gas was extracted at 2273 K. The analytical values well agreed with each other. The recovery of oxygen was over 98% when analysing the synthetic samples in which aluminum oxide was added, and so it was confirmed to completely extract oxygen in samples. In the analysis of Al-Zn(5.6%)-Mg(2.6%) powder (Extra super duralumin), ten times of the amount of nickel foil as many as that of a sample were used and increasing temperature method (1873→2173 K) was applied. In the analysis of Al-Ti-Ta alloy powder (MA 6000 master alloy), ten times of the amount of nickel foil were also used and a constant temperature method (2173 K) was applied. The analytical values by the metal bath method well agreed with those by the graphite capsule method. A rapid and accurate method has been established.