Effect of Al2O3 addition on texturing in a rotating strong magnetic field and densification of B4C

Muhammad Fajar; Anna Gubarevich; Ryosuke S.S. Maki; Tetsuo Uchikoshi; Tohru S. Suzuki; Toyohiko Yano; Katsumi Yoshida

doi:10.1016/j.ceramint.2019.06.032

Effect of Al₂O₃ addition on texturing in a rotating strong magnetic field and densification of B₄C

Muhammad Fajar^*, Anna Gubarevich, Ryosuke S.S. Maki, Tetsuo Uchikoshi, Tohru S. Suzuki, Toyohiko Yano, Katsumi Yoshida

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The properties of ceramics can be improved by controlling the microstructure through texturing ceramics in a strong magnetic field. Fabricating dense boron carbide (B₄C) requires high temperature sintering, therefore sintering additives are often used in order to densify B₄C ceramics at lower temperatures. However, combined effect of texturing and sintering additives on densification of B₄C has not been made clear yet. Here we report the effect of alumina (Al₂O₃) sintering additive on texturing in a strong magnetic field and densification of B₄C. Texturing was performed by rotating superconducting magnet at 12 T during slip casting process. Electron backscatter diffraction (EBSD) was used to observed the texturing projection. {0001} plane is clearly oriented in the plane parallel to rotating magnetic field. In addition, Lotgering factor was also calculated as quantitatively evaluation of texturing degree. Results on densification showed that addition of Al₂O₃ successfully increased density of B₄C sintered by spark plasma sintering (SPS) at 1800^oC to 97.8%. Formation of aluminum borate (Al₅BO₉) as secondary phase was detected by X-Ray diffraction (XRD). It is considered that the generation of Al₅BO₉ assisted finer densification of B₄C ceramic. Textured B₄C sintered at 1700^oC by SPS without alumina addition exhibited the highest orientation of c-axis. Addition of alumina caused decrease in degree of orientation of c-axis.

Original language	English
Pages (from-to)	18222-18228
Number of pages	7
Journal	Ceramics International
Volume	45
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2019.06.032
Publication status	Published - 2019 Oct 15
Externally published	Yes

Keywords

AlO
Ceramic
Densification
Sintering
Slip casting
Textured boron carbide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2019.06.032

Cite this

@article{0be444f86138406dbc72b98d16bf4721,

title = "Effect of Al2O3 addition on texturing in a rotating strong magnetic field and densification of B4C",

abstract = "The properties of ceramics can be improved by controlling the microstructure through texturing ceramics in a strong magnetic field. Fabricating dense boron carbide (B4C) requires high temperature sintering, therefore sintering additives are often used in order to densify B4C ceramics at lower temperatures. However, combined effect of texturing and sintering additives on densification of B4C has not been made clear yet. Here we report the effect of alumina (Al2O3) sintering additive on texturing in a strong magnetic field and densification of B4C. Texturing was performed by rotating superconducting magnet at 12 T during slip casting process. Electron backscatter diffraction (EBSD) was used to observed the texturing projection. {0001} plane is clearly oriented in the plane parallel to rotating magnetic field. In addition, Lotgering factor was also calculated as quantitatively evaluation of texturing degree. Results on densification showed that addition of Al2O3 successfully increased density of B4C sintered by spark plasma sintering (SPS) at 1800oC to 97.8%. Formation of aluminum borate (Al5BO9) as secondary phase was detected by X-Ray diffraction (XRD). It is considered that the generation of Al5BO9 assisted finer densification of B4C ceramic. Textured B4C sintered at 1700oC by SPS without alumina addition exhibited the highest orientation of c-axis. Addition of alumina caused decrease in degree of orientation of c-axis.",

keywords = "AlO, Ceramic, Densification, Sintering, Slip casting, Textured boron carbide",

author = "Muhammad Fajar and Anna Gubarevich and Maki, {Ryosuke S.S.} and Tetsuo Uchikoshi and Suzuki, {Tohru S.} and Toyohiko Yano and Katsumi Yoshida",

note = "Funding Information: This work was partially supported by The Ministry of Education , Culture, Sport, Science and Technology (MEXT) under the framework of Innovative Nuclear Research and Development Program . Research Project: “Development of Highly Microstructure-Controlled Ceramics Neutron Absorbers for Improving Safety of Fast Reactors”. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd and Techna Group S.r.l.",

year = "2019",

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day = "15",

doi = "10.1016/j.ceramint.2019.06.032",

language = "English",

volume = "45",

pages = "18222--18228",

journal = "Ceramics International",

issn = "0272-8842",

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TY - JOUR

T1 - Effect of Al2O3 addition on texturing in a rotating strong magnetic field and densification of B4C

AU - Fajar, Muhammad

AU - Gubarevich, Anna

AU - Maki, Ryosuke S.S.

AU - Uchikoshi, Tetsuo

AU - Suzuki, Tohru S.

AU - Yano, Toyohiko

AU - Yoshida, Katsumi

N1 - Funding Information: This work was partially supported by The Ministry of Education , Culture, Sport, Science and Technology (MEXT) under the framework of Innovative Nuclear Research and Development Program . Research Project: “Development of Highly Microstructure-Controlled Ceramics Neutron Absorbers for Improving Safety of Fast Reactors”. Publisher Copyright: © 2019 Elsevier Ltd and Techna Group S.r.l.

PY - 2019/10/15

Y1 - 2019/10/15

N2 - The properties of ceramics can be improved by controlling the microstructure through texturing ceramics in a strong magnetic field. Fabricating dense boron carbide (B4C) requires high temperature sintering, therefore sintering additives are often used in order to densify B4C ceramics at lower temperatures. However, combined effect of texturing and sintering additives on densification of B4C has not been made clear yet. Here we report the effect of alumina (Al2O3) sintering additive on texturing in a strong magnetic field and densification of B4C. Texturing was performed by rotating superconducting magnet at 12 T during slip casting process. Electron backscatter diffraction (EBSD) was used to observed the texturing projection. {0001} plane is clearly oriented in the plane parallel to rotating magnetic field. In addition, Lotgering factor was also calculated as quantitatively evaluation of texturing degree. Results on densification showed that addition of Al2O3 successfully increased density of B4C sintered by spark plasma sintering (SPS) at 1800oC to 97.8%. Formation of aluminum borate (Al5BO9) as secondary phase was detected by X-Ray diffraction (XRD). It is considered that the generation of Al5BO9 assisted finer densification of B4C ceramic. Textured B4C sintered at 1700oC by SPS without alumina addition exhibited the highest orientation of c-axis. Addition of alumina caused decrease in degree of orientation of c-axis.

AB - The properties of ceramics can be improved by controlling the microstructure through texturing ceramics in a strong magnetic field. Fabricating dense boron carbide (B4C) requires high temperature sintering, therefore sintering additives are often used in order to densify B4C ceramics at lower temperatures. However, combined effect of texturing and sintering additives on densification of B4C has not been made clear yet. Here we report the effect of alumina (Al2O3) sintering additive on texturing in a strong magnetic field and densification of B4C. Texturing was performed by rotating superconducting magnet at 12 T during slip casting process. Electron backscatter diffraction (EBSD) was used to observed the texturing projection. {0001} plane is clearly oriented in the plane parallel to rotating magnetic field. In addition, Lotgering factor was also calculated as quantitatively evaluation of texturing degree. Results on densification showed that addition of Al2O3 successfully increased density of B4C sintered by spark plasma sintering (SPS) at 1800oC to 97.8%. Formation of aluminum borate (Al5BO9) as secondary phase was detected by X-Ray diffraction (XRD). It is considered that the generation of Al5BO9 assisted finer densification of B4C ceramic. Textured B4C sintered at 1700oC by SPS without alumina addition exhibited the highest orientation of c-axis. Addition of alumina caused decrease in degree of orientation of c-axis.

KW - AlO

KW - Ceramic

KW - Densification

KW - Sintering

KW - Slip casting

KW - Textured boron carbide

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