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 Suzuki, Toyohiko Yano, Katsumi Yoshida

Research output: Contribution to journalArticle

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.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Texturing
Densification
Magnetic fields
Aluminum Oxide
Sintering
Alumina
Spark plasma sintering
Boron carbide
Borates
Superconducting magnets
Aluminum
Electron diffraction
Casting
X ray diffraction
Temperature
Microstructure

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

Cite this

Effect of Al2O3 addition on texturing in a rotating strong magnetic field and densification of B4C. / Fajar, Muhammad; Gubarevich, Anna; Maki, Ryosuke S.S.; Uchikoshi, Tetsuo; Suzuki, Tohru; Yano, Toyohiko; Yoshida, Katsumi.

In: Ceramics International, 01.01.2019.

Research output: Contribution to journalArticle

Fajar, Muhammad ; Gubarevich, Anna ; Maki, Ryosuke S.S. ; Uchikoshi, Tetsuo ; Suzuki, Tohru ; Yano, Toyohiko ; Yoshida, Katsumi. / Effect of Al2O3 addition on texturing in a rotating strong magnetic field and densification of B4C. In: Ceramics International. 2019.
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