著者

大石 郁 藤井 英俊

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.53, no.12, pp.603-607, 2014 (Released:2014-12-01)

参考文献数

26

被引用文献数

6 7

著者

吉村 彰大 松野 泰也

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.83, no.1, pp.23-29, 2019-01-01 (Released:2018-12-25)

参考文献数

42

被引用文献数

11 10

---

In this paper, a novel method for recovering platinum using molten FeCl3-KCl system as “dry aqua regia” is presented. The method consists of the dissolution of platinum by molten FeCl3-KCl system and the recovery of dissolved platinum by the solvent leaching of frozen FeCl3-KCl, using the different solubility between platinum compounds and iron compounds for the solvents. Platinum dissolution was conducted in the molten FeCl3-KCl system at 585-655 K. The maximum dissolution rate of platinum was 0.45 mol・m−2・h−1, which is fast enough compared with the hydrometallurgy process using aqua regia or electrochemical dissolution process in ionic liquid. And dissolved platinum recovered as K2(PtCl6) by the solvent leaching of frozen FeCl3-KCl using water or ethanol. This “dry aqua regia” process have a number of advantages, including low energy consumption, easy operation and low toxicity of chemicals compared with pyrometallurgy process and hydrometallurgy process, as recycling process of platinum.

著者

木村 智人 鈴木 崇宣 小泉 裕 横川 忠晴 原田 広史 今井 八郎

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.71, no.11, pp.1041-1045, 2007 (Released:2007-11-02)

参考文献数

4

被引用文献数

8 9

---

A post service examination of a turbine blade from a civil aeroengine has been carried out to ascertain the degree of microstructural coarsening and the distribution of crack damage induced during service. This was with the purpose to elucidate their correlation with the actual operating conditions. Samples were sectioned from different parts of the turbine blade for detailed examination by optical microscope and scanning electron microscope. The average length of cracks was used as one of the parameters to quantitatively illustrate the distribution of cracks on the turbine blade. Experimental results suggested that cracks were mainly concentrated on certain area of the pressure side. Leading edge of the suction side of the turbine blade consisted of mostly coarsened microstructure due to higher temperature exposure. In conclusions, there was no clear correlation between the crack damage distribution and the degree of microstructure evolution.

著者

加藤 雅治

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.47, no.6, pp.317-322, 2008-06-01 (Released:2011-08-11)

参考文献数

4

被引用文献数

6 5

著者

世利 修美 丹野 聡司

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.73, no.11, pp.878-883, 2009 (Released:2009-11-01)

参考文献数

9

被引用文献数

7 7

---

Behavior of dry corrosion which is electrochemical reaction between Al-Mg-Si alloy 6063 and ethanol in gasoline has been investigated. Dry corrosion has not been observed in E3 (3% ethanol) and E10 (10% ethanol) at room temperature, but observed in E3 and E10 when a small amount of aluminum chloride had been added to them at room temperature. The higher solution temperature is, the more often the dry corrosion occurs. Dry corrosion has also been observed in the above solution environments in which 0.1% and 1% water contained. Occurrence of dry corrosion was detected by the area polarization method, which revealed that initiation and propagation of the dry corrosion corresponds to the decrease of anodic polarized resistance of 6063.

著者

岡本 聡 蓬田 貴裕 宮澤 和則 菊池 伸明 北上 修 渡辺 奈生巳 吹田 尚久

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.56, no.9, pp.533-540, 2017 (Released:2017-09-01)

参考文献数

43

被引用文献数

2 4

著者

本間 敏夫

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.21, no.4, pp.263-267, 1957 (Released:2008-04-04)

参考文献数

11

被引用文献数

6 9

---

The characteristics of Umklapp transformation in Fe-Ni alloy containing 31%Ni were clarified through various experiments. (1) The Umklapp process is characterized by a burst phenomenon. (2) Great kinetic energy accompanied by the umklapp process can make a martensite leaf propagate into a temperature range higher than the usual γ→α transformation temperature in a single crystal with temperature gradient. (3) The 1st burst temperature is scattered statistically in a wide range of temperature. (4) The transformation amounts produced by the 1st burst increases with the degree of supercooling.

著者

栃木 栄太

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.54, no.8, pp.409-412, 2015 (Released:2015-08-01)

参考文献数

14

著者

宮川 長二 羽田 紘一 後藤 公美 宮原 鉄洲

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.53, no.11, pp.1168-1176, 1989 (Released:2008-04-04)

参考文献数

26

被引用文献数

2 1

---

Small particles of Fe3C (cementite) in an acicular shape (0.2 μm in length, 10/1 in axial ratio) have been synthesized by heating acicular shaped powders of iron (α-Fe) in a flow of carbon monoxide or/and hydrogen gas mixture. X-ray analyses, electron microscopy, magnetic measurements and Mössbauer spectroscopy are employed for the characterizations. The chemical treatment required to obtain single phase Fe3C particles has been studied in the carburizing temperature range from 623 to 873 K. The saturation magnetization (σs) and intrinsic coercive force (iHc) attained are around 138×10−6 Wb·m·kg−1 (110 emu·g−1) and 51.7 kA·m−1 (650 Oe), respectively. Possible applications for magnetic recording powders are found for Fe3C particles synthesized at 823 K and above through a durability test of magnetic properties, by placing the particles in air of 333 K-90% relative humidity for a prolonged time.

著者

木村 隆義 次田 泰裕

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.33, no.12, pp.1459-1463, 1994-12-20 (Released:2011-08-11)

参考文献数

3

著者

藤田 浩示 高原 良博

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.71, no.11, pp.1057-1060, 2007 (Released:2007-11-02)

参考文献数

9

---

We have studied the effect of the chlorine addition on the ultraviolet transmission property of soda-lime glasses to develop the ultraviolet penetration glass with soda-lime compositions. At first, a molecular-dynamics calculation is carried out to investigate how the addition of chlorine has influence on the non-bridged oxygen which causes the absorption of ultraviolet in the soda-lime glass. It is shown from the calculation that the chlorine addition reduces the amount of the non-bridged oxygen. Based on the result, we fabricate the soda-lime glasses containing chlorine by using a platinum crucible, and then measure the transmittance of ultraviolet at 260 nm wavelength. Apparent improvement of ultraviolet transmittance of the soda-lime glasses is confirmed from the measurements. As a result, improvement of ultraviolet transmittance is below 10%, so enough improvement of ultraviolet transmittance is not available by addition of chlorine.

著者

秋葉 悦男

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.35, no.11, pp.1191-1194, 1996-11-20 (Released:2011-08-11)

参考文献数

19

著者

高林 弘実 北田 正弘 辻本 勝浩

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.69, no.7, pp.538-543, 2005 (Released:2005-10-12)

参考文献数

17

被引用文献数

3 3

---

The discoloration and chemical composition changes of red-lead used for wood-block print made in the late Edo period have been investigated. Both the chromaticity and lightness of red-lead decrease with discoloration, and its hue exhibits very little change. This is due to the reflectance decrease of red-lead in a long-wavelength range beyond the absorption edge of 580 nm. Red-lead is a mixture of Pb3O4 and β-PbO and has a grain size of 0.05-0.2 μm. The X-ray diffraction intensity of β-PbO considerably decreases with discoloration in comparison with that from Pb3O4. This result shows that β-PbO is more reactive than Pb3O4 in the mixture. The results of XPS measurement suggest that both lead chloride and lead carbonate exist in the surface layer of red-lead.

著者

蒲地 一嘉

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.46, no.4, pp.401-406, 1982 (Released:2008-04-04)

参考文献数

5

被引用文献数

1

---

Since austenitic stainless steels have some useful properties for medical instruments, such as high corrosion resistance, high strength and high elasticity, they are used as needles for acupancture and anesthesia. The failure of the needles, however, have been reported to occur during medical treatments. This becomes a serious problem for both a doctor and a patient.Causes of the failure have been studied in the present paper and the following conclusion has been derived; In case in which the needle is used as an anode, the failure occurs due to pitting corrosion, whereas, in case in which it is used as a cathode, embrittlement due to hydride formation occurs.

著者

井野 博満 上澤 千尋 伊東 良徳

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.72, no.4, pp.261-267, 2008 (Released:2008-04-01)

参考文献数

12

被引用文献数

1 1

---

Surveillance data for pressure vessel steels of the 51 LWR plants in Japan were analyzed to make clear the effect of neutron irradiation on the brittle transition temperature of the steels. The clear difference observed in the rise of the ductile to brittle transition temperature between the normal and accelerated irradiation samples is considered to be due to the effect of neutron flux. The present analysis is discussed in comparison with the result of computer simulation based on the rate equations of the radiation damage process and the recent experiments of APFIM and positron annihilation.

著者

野方 文雄

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.35, no.8, pp.886-892, 1996-08-20 (Released:2011-08-11)

参考文献数

37

被引用文献数

1 2

著者

長村 光造

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.42, no.5, pp.392-396, 2003-05-20 (Released:2011-08-11)

参考文献数

7

著者

松尾 宗次

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.37, no.11, pp.949-952, 1998-11-20 (Released:2011-08-11)

参考文献数

16

著者

小岩 昌宏

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.50, no.2, pp.55-62, 2011 (Released:2012-11-29)

参考文献数

35

被引用文献数

1 4

著者

矢野 歳和 木皿 且人 鈴木 一行 石川 東一郎 新野 正之

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.50, no.4, pp.158-160, 2011 (Released:2012-12-06)

参考文献数

11