高温度に於ける鐵の窒素吸着竝に吸収に關する研究
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The nitrogen adsorption and absorption of iron were investigated by holding pure iron in contact with gas and quickly cooling it, at several temperatures between 500℃ and 1, 350℃. The amount of nitrogen in the metal was then determind by chemical analysis. The results obtained are summarized as follows : - 1) Two important influences on the solubility of nitrogen in iron were discovered. One is the existence of N_2 adsorption layer on the surface and the other is the densities of the aggregate of the iron powder. 2) Paying attention to these two important influences, new adsorption and absorption isobars of nitrogen for iron were determined. 3) The author's adsorption isobar in a range between 500℃ and 1, 350℃ has three discontinuities at about 770℃, about 900℃ and at a certain temperature between 1, 100℃ and 1, 150℃. The temperature coefficients of the isobar are all positive between each temperature. 4) The author's absorption isobar in a range between 500℃ and 1, 350℃ begins at about 770℃ and have two discontinuities at about 900℃ and at a certain temperature between 1, 100℃ and 1, 150℃. 5) The solubilities of nitrogen in iron, mg N_2/100g Fe, under atmospheric pressure are as follows : - Zero at 770℃, <0.4 at 880℃, 11.5 at 950℃, 12.8 at 1, 100℃, 21.8 at 1, 150℃, 22.6 at 1, 250℃ and 23.0 at 1, 350℃. 6) The author's two isobars, i.e., the adsorption isobar and the absorption isobar, show that a transformation of iron relating to chemical affinity exists at a certain temperature between 1, 100℃ and 1, 150℃.
- 社団法人日本鉄鋼協会の論文
- 1940-02-25
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