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Properties of sodium borosilicate glasses/Al2O3 sintered composites containing fluorides. Gan Fukkabutsu hokei san natoriumu garasu to alumina fukugo shoketsutai no bussei

Journal Article:

Abstract

Glass/alumina sintered composites were synthesized from sodium borosilicate glass powder containing fluorides like AlF3 and NaF3, and Al2O3, and change in material properties was examined. Glass compositions of B2O3 and Na2O greatly affected the crystal phase and material properties. Nephelin crystal phase was extracted by the reaction of Na2O, NaF2, SiO2 and Al2O3 when B/Na<1. Coefficient of thermal expansion increased with the increase of Na/Si ratio. The residual amount of fluorides of sintered materials in nitrogen atmosphere was higher than that of air, and differed with the type of fluoride. The F[sup -] of NaF is bonded with Si of glass network and forms quiet stable glass structure, whereas, F[sup -] of AlF3 reacts with Si[sup 4+] forming SiF4 which is vaporized. Sintering temperature and dielectric constant of sintered materials containing fluoride was lower than the sintered materials without fluorides addition, however, at a sintering temperature range of 100 to 150[degree]C, it was inferred that this was because of the increase in voids due to SiF4 formed in the reaction. 16 refs., 17 figs., 3 tabs.
Authors:
Ryu, Bonggi; Yasui, I [1] 
  1. The Univ. of Tokyo, Tokyo (Japan). Inst. of Industrial Science
Publication Date:
Jun 01, 1993
Product Type:
Journal Article
Reference Number:
NEDO-93-912304; EDB-94-005502
Resource Relation:
Journal Name: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi (Journal of the Ceramic Society of Japan); (Japan); Journal Volume: 101:1174
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; COMPOSITE MATERIALS; SINTERED MATERIALS; GLASS; BORIDES; SILICATES; SODIUM FLUORIDES; ATMOSPHERES; NITROGEN; ALUMINIUM FLUORIDES; DIELECTRIC PROPERTIES; POROSITY; ALKALI METAL COMPOUNDS; ALUMINIUM COMPOUNDS; BORON COMPOUNDS; CHALCOGENIDES; ELECTRICAL PROPERTIES; ELEMENTS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; MATERIALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SILICON COMPOUNDS; SODIUM COMPOUNDS; 360606* - Other Materials- Physical Properties- (1992-)
OSTI ID:
5625185
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: ISSN 0914-5400; CODEN: NSKRE2
Submitting Site:
NEDO
Size:
Pages: 693-697
Announcement Date:

Journal Article:

Citation Formats

Ryu, Bonggi, and Yasui, I. Properties of sodium borosilicate glasses/Al2O3 sintered composites containing fluorides. Gan Fukkabutsu hokei san natoriumu garasu to alumina fukugo shoketsutai no bussei. Japan: N. p., 1993. Web.
Ryu, Bonggi, & Yasui, I. Properties of sodium borosilicate glasses/Al2O3 sintered composites containing fluorides. Gan Fukkabutsu hokei san natoriumu garasu to alumina fukugo shoketsutai no bussei. Japan.
Ryu, Bonggi, and Yasui, I. 1993. "Properties of sodium borosilicate glasses/Al2O3 sintered composites containing fluorides. Gan Fukkabutsu hokei san natoriumu garasu to alumina fukugo shoketsutai no bussei." Japan.
@misc{etde_5625185,
title = {Properties of sodium borosilicate glasses/Al2O3 sintered composites containing fluorides. Gan Fukkabutsu hokei san natoriumu garasu to alumina fukugo shoketsutai no bussei}
author = {Ryu, Bonggi, and Yasui, I}
abstractNote = {Glass/alumina sintered composites were synthesized from sodium borosilicate glass powder containing fluorides like AlF3 and NaF3, and Al2O3, and change in material properties was examined. Glass compositions of B2O3 and Na2O greatly affected the crystal phase and material properties. Nephelin crystal phase was extracted by the reaction of Na2O, NaF2, SiO2 and Al2O3 when B/Na<1. Coefficient of thermal expansion increased with the increase of Na/Si ratio. The residual amount of fluorides of sintered materials in nitrogen atmosphere was higher than that of air, and differed with the type of fluoride. The F[sup -] of NaF is bonded with Si of glass network and forms quiet stable glass structure, whereas, F[sup -] of AlF3 reacts with Si[sup 4+] forming SiF4 which is vaporized. Sintering temperature and dielectric constant of sintered materials containing fluoride was lower than the sintered materials without fluorides addition, however, at a sintering temperature range of 100 to 150[degree]C, it was inferred that this was because of the increase in voids due to SiF4 formed in the reaction. 16 refs., 17 figs., 3 tabs.}
journal = {Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi (Journal of the Ceramic Society of Japan); (Japan)}
volume = {101:1174}
journal type = {AC}
place = {Japan}
year = {1993}
month = {Jun}
}