巻号一覧
29 巻 (1989)
- 4 号 p. 151-
- 3 号 p. 107-
- 2 号 p. 55-
- 1 号 p. 1-
29 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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林 剛, 渡辺 潔, 広中 清一郎1989 年 29 巻 2 号 p. 55-62
発行日: 1989/08/25
公開日: 2011/09/20
ジャーナル フリーA new application was found for sericite clay as an antioxidizing coating for controlling the oxides scale formation on the course of heat treatment of 13Cr-stainless steel. The sericite coating in the form of alcoholic suspension was applied by spraying on the surface of the 13Cr4Ni-Stainless steel test piece which was previously warmed at 80°C, then the test piece was heat-treated at the temperatures ranging from 700°C to 1000°C. The thickness of the oxides scale on the surface with the sericite coating of the steel substrate decreased significantly during the period of heat treatment, compared with the case of no coating. It was observed that the thin hexagonal platelets of the sericite particles with mean size of 0.3μm piled up densely with each layer surfaces oriented in direction parallel onto the metal surface and also adhered to the metal surface keeping the basal crystal structure and the particle shape changed to little extent up to 1000°C. Such a good adhesive property of the sericite coat is due to not only its particle shape but also its own thermal properties. These characteristic functions of the sericite clay forming dense film and maintaining adhesive up to 1000°C result in the antioxidizing barrier blocking off air permeation to the metal surface.抄録全体を表示PDF形式でダウンロード (6629K) -
林 剛, 広中 清一郎, 大津賀 望, 田端 勇仁1989 年 29 巻 2 号 p. 63-68
発行日: 1989/08/25
公開日: 2011/09/20
ジャーナル フリーEffects of a nonionic surfactant (oleyl amine with ethylene oxide) on the stability of the ethanolic suspension of sericite were investigated. The results obtained by the observation of the suspensions with a series of the surfactants differing molar proportions of ethylene oxide (n=2, 5 and 10) are as follows.
The surfactants having the property to be charged positively by accepting protons from neighboring substances are adsorbed onto the negatively charged surface of the sericite from the alcoholic solution by electrostatic interaction. The monolayer of the adsorbate surfactant is formed on the sericite surface, and the suspensions undergo deflocculation at much the same molar concentration of these three surfactants. The sediment volume of the particles formed reduces owing to the improvement of dispersibility of the suspension, as molar proportion of ethylene oxide among the three surfactants increases.
The adsorbed layer of the surfactant on the solid surface has the two functional groups. Ethylene oxide chains are forced to orient towards the alcoholic phase, and oleyl groups act expelling alcohol molecules away from the ethylene oxide chains. Thus, the suspensions with these surfactants have a tendency to be weakly flocculated because of decreased solvation, forming the sediments easily redispersible.
Compared with the stable suspension by the steric stabilizing mechanism with a polymeric dispersant that forms the strong caking of the settled particles, the suspensions with the ethoxylated surfactants are considered to be effective in the cases of practical applications that the suspension is required to prevent strong caking during standing.抄録全体を表示PDF形式でダウンロード (4571K) -
米田 哲朗1989 年 29 巻 2 号 p. 69-80
発行日: 1989/08/25
公開日: 2011/09/20
ジャーナル フリーThe Minamishiraoi deposits, one of the kuroko-type barite deposits located in the southwestern Hokkaido, are embedded in volcanic and pyroclastic rocks of Tertiary age, and are composed of hanging wall, barite are body, silicified zone, argillized zone and weakly argillized zone. The kaolin clay occurring widely and abundantly in the argillized zone, is being exploited. This paper describes the clay mineral composition of the deposits, and some features of clay minerals.
The clay mineral occurring in the hanging wall, is smectite, and halloysite. In the foot wall as silicified zone, argillized zone and weakly argillized zone, it is dickite, nacrite, kaolinite, sericite mineral (sericite and interstratified sericite/smectite), smectite, Al-chlorite and interstratified chlorite/smectite.
Kaolin and sericite minerals, principal constituent clay minerals, show characteristic spatial distributions in the foot wall. Dickite and nacrite occur in the marginal part of the silicified zone and in the argillized zone. On the other hand, kaolinite occurs appoximately in the central or marginal part of the argillized zone. Sericite mineral containing a small amount of expandable layers, occurs in and around the silicified zone. On the other hand, the mineral with a large amount of them, occurs in the argillized zone, approximately.
Smectite, one of the principal constituent minerals, is dioctahedral type, and show compositional difference between the mineral of the hanging wall and that of the foot wall. The former is Fe-rich, and the latter Al-rich. Chlorite minerals are also dioctahedral type, suggesting to be sudoite and tosudite.
Considering the clay mineral composition of the deposits and the kaolin-sericite-solution equilibrium, it may be inferred that the formation of kaolin clay is attributable to the acidic hydrothermal process of low-temperature, which was dominant during the reletively later mineralization of the Minamishiraoi deposits.抄録全体を表示PDF形式でダウンロード (10478K) -
池谷 元伺1989 年 29 巻 2 号 p. 81-88
発行日: 1989/08/25
公開日: 2011/09/20
ジャーナル フリーElectron spin resonance (ESR) dating of minerals, fossils and archaeological substances can be made by measuring the accumulated concentration of unpaired electrons created by natural radiation. ESR dating based on chemical reactions can be made by using the concentration of radical created by oxidation or deterioration reaction. Microscopic distribution of unpaired electron concentration is observed with ESR microscope.
Geological history of thermal events, stress, light exposure, deterioration and recrystallization can be studied using ESR signals of radiation-induced defects or paramagnetic ions like Fe3+ and Mn2+. Hence, ESR is a powerful tool of studying ceramics and clay minerals.抄録全体を表示PDF形式でダウンロード (3758K) -
粘土と生命の起原に関連して湯浅 精二1989 年 29 巻 2 号 p. 89-96
発行日: 1989/08/25
公開日: 2011/09/20
ジャーナル フリーThe formations of biologically interesting compounds such as amino acids and nucleic acid bases from hydrogen cyanide in the prsence of clay and metal complexes are described. A possible role of clay mineral on the construction of organized molecules is also discussed by referring to the Bernal's hypothesis of the role of clay minerals on the origin of life.抄録全体を表示PDF形式でダウンロード (891K)
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