著者

松尾 泰明 武部 博倫 太田 能生 森永 健次

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.105, no.14, pp.1067-1071, 1989-12-20 (Released:2011-01-27)

参考文献数

18

被引用文献数

2 5

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The effect of the cooling condition of ferro nickel slag melts on retained glass and crystalline phases (enstatite, forsterite, cristobalite) has been discussed.Commercial ferro nickel slags were classified into two groups; one (slag A, B, C) was located the composition of the olivine (forsterite) primary phase field and the other (slag D)was the eutectic field between pyroxene (enstatite) and olivine in the FeO-MgO-SiO2system.The critical cooling rates for glass forming determined directly from the CCT diagrams were in the range of 120 to 20°C/sec and those were dependent on the content of SiO2as a network former. Forsterite, enstatite, and ristobalite crystallized from all of the ferro nickel slags in that order with decreasing the continuous cooling rate. The first crystalline phase at isothermal heat treatment from the slag A, B, C was forsterite, while those of the slag D were forsterite and enstatite. Enstatite and cristobalite gradually crystallized with the holding time at this treatment.In addition, the possibility of alkali-aggregate reaction were evaluated by the chemical test, ASTMC289 for the as-received and the heat-treated slags.

著者

武部 博倫 亀田 常治 小松 通泰 米屋 勝利 森永 健次

出版者

社団法人 日本セラミックス協会

雑誌

Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) (ISSN:09145400)

巻号頁・発行日

vol.97, no.1122, pp.166-173, 1989-02-01 (Released:2010-08-06)

参考文献数

11

被引用文献数

9 15

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The single-phase region of AlON, a spinel type solid solution in the system Al2O3-AlN, has been determined. AlON was synthesized from solid phase reactions between Al2O3 and AlN powder in several reaction vessels. The reaction vessel of porous Al2O3 with AlN coating was suitable for obtaining pure AlON. The single-phase region of AlON was from 28 to 32mol% AlN at 1700°C and from 20 to 34mol% AlN at 1800°C. The lattice parameters of AlON increased from 7.926 to 7.946Å with increasing AlN content. Y2O3-powder was used as a sintering aid to obtain translucent AlON from synthesized AlON powder at low temperature. For 1wt% Y2O3 addition, the translucent AlON was obtained at 1800°C, and its relative density and flexural strength were 99% and 250MPa, respectively.

著者

吉田 慎 藤野 茂 森永 健次

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.120, no.8, pp.451-454, 2004 (Released:2006-04-27)

参考文献数

7

被引用文献数

2 3

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Transparent pyrex glasses were obtained by sintering a green compact, which was fabricated by using CIP method for pyrex glass powder, in diverse atmosphere (air, Ar, He and vacuum (10-2Pa)) at 973-1173K. Effects of sintering conditions (temperature and atmosphere) on transmittance of sintered glasses were investigated. Devitrification resulting from crystallization of cristobalite arose in all atmosphere at temperatures over 1023K. Optimum sintering condition for fabricating transparent sintered pyrex glass was at 1003 K for 1hour in a vacuum (10-2 Pa) or He atmosphere in this work. The transparency was 15∼20% in visible region and was about 60% in infrared region. The relationship between transparency and condition of the sintered glasses was discussed in terms of permeation constant of gas species during sintering.