著者

高山 透 日野谷 重晴 石黒 三岐雄 黒澤 文夫 安原 久雄 源内 規夫 千野 淳 九津見 啓之 儀賀 義勝 助信 豊 内山 雅夫 石井 実

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.82, no.2, pp.147-152, 1996-02-01

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The method for isolation and determination of TiN and (Ti, Nb)(C, N) precipitated in Nb-Ti bearing steels has been investigated in the cooperative research of the Precipitate Analysis Subcommittee of Iron and Steel Analysis Committee of Iron and Steel Institute of Japan. Also, the precipitation behavior of TiN and (Ti, Nb)(C, N) in the steels has been studied. The results are summarized as follows ; (1) TiN, (Ti, Nb)(C, N) and other precipitates were extracted by potentiostatic or galvanostatic electrolysis in 10% acetylacetone-1% tetramethylammonium chloride-methanol electrolyte. (2) Only the TiN in the above mentioned precipitates was insoluble and remained by 60℃-10% bromine-methanol solution treatment. Consequently, the amount and composition of TiN and (Ti, Nb)(C, N) could be determined quantitatively by analysis of the residues extracted by using the method of (1) and the residues after this treatment. (3) The size of TiN was several micrometers, the amount of TiN did not change with heating temperatures between 1000 and 1250℃, and the atomic ratio of Ti to N was stoichiometrically one to one. (4) Total amount of Ti and Nb in the precipitates decreased with an increase in heating temperature, because the small size of (Ti, Nb)(C, N) dissolved. (5) Both lattice constant and composition changes in (Ti, Nb)(C, N) showed that Nb and C dissolved preferably into the matrix and the composition of the precipitates approached to that of TiN with an increase in heating temperature. (6) Such behavior of precipitates agreed well with rough calculation from the solubility products.

著者

高山 透 村田 勝夫 池田 重良

出版者

公益社団法人日本分析化学会

雑誌

分析化学 (ISSN:05251931)

巻号頁・発行日

vol.34, no.12, pp.781-785, 1985-12-05

被引用文献数

2 2

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減圧下誘電放電による窒素アフターグロー生成法を用いた発光分析装置を試作した.タンタル板製の加熱型アトマイザー上で減圧乾燥した溶液試料を加熱によって5Torrの気相に放出し,誘電放電路を流れてきた窒素と混合する.このとき,試料は三重項準安定励起窒素分子N_2(A^3Σ^+_u)からエネルギーを受け取り発光する.この装置を用いて,亜鉛,カドミウム,水銀の各溶液についてそれぞれの元素の中性原子線の発光を観測したが,その検出限界はそれぞれ5ng (472.2 nm), 0.1ng (326.1 nm), 0.03ng (253.7nm)であった.陰イオンの影響を調べるために,塩化物,硝酸塩,硫酸塩の各溶液について検量線を比較し,又,酸の濃度変化による金属の発光強度変化についても検討した.