Effect of powder characteristics on sintering behavior and mechanical properties of alumina compacted by high-speed centrifugal compaction process

Hiroyuki Y. Suzuki, Kenji Shinozaki, Shunzo Tashima, Hidenori Kuroki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Two types of fine (0.2 μm) and pure (99.99%) alumina powders are dispersed in ion-exchanged water and compacted into a columnar shape of φ 8 × 60 mm by the High-Speed Centrifugal Compaction Process (HCP) at 11,500 rpm for 3 ks. Specimens are sintered at 1423-1823 K for 5.4 ks. HCP alumina shows good compactibility regardless of starting powder. Its behavior is slightly affected by the dispersing condition of the slip. The sintering behavior of compacts can be evaluated by grain-size/relative-density trajectory. The optimum mechanical properties are realized at a characteristic part of the curve, where the curve starts to go upward. Bending strength of the alumina with different starting materials obeys basically one equation. So does the Vickers hardness. Therefore, the strength-microstructure diagram has validity for HCP alumina of various powders. The powder which gives lower position for grain-size/relative-density trajectory of sintered alumina gives higher mechanical properties.

Original languageEnglish
Pages (from-to)866-873
Number of pages8
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume47
Issue number8
Publication statusPublished - Aug 2000
Externally publishedYes

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Aluminum Oxide
Powders
Compaction
Alumina
Sintering
Mechanical properties
Trajectories
Sintered alumina
Vickers hardness
Bending strength
Ions
Microstructure
Water

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

Cite this

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abstract = "Two types of fine (0.2 μm) and pure (99.99{\%}) alumina powders are dispersed in ion-exchanged water and compacted into a columnar shape of φ 8 × 60 mm by the High-Speed Centrifugal Compaction Process (HCP) at 11,500 rpm for 3 ks. Specimens are sintered at 1423-1823 K for 5.4 ks. HCP alumina shows good compactibility regardless of starting powder. Its behavior is slightly affected by the dispersing condition of the slip. The sintering behavior of compacts can be evaluated by grain-size/relative-density trajectory. The optimum mechanical properties are realized at a characteristic part of the curve, where the curve starts to go upward. Bending strength of the alumina with different starting materials obeys basically one equation. So does the Vickers hardness. Therefore, the strength-microstructure diagram has validity for HCP alumina of various powders. The powder which gives lower position for grain-size/relative-density trajectory of sintered alumina gives higher mechanical properties.",
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T1 - Effect of powder characteristics on sintering behavior and mechanical properties of alumina compacted by high-speed centrifugal compaction process

AU - Suzuki, Hiroyuki Y.

AU - Shinozaki, Kenji

AU - Tashima, Shunzo

AU - Kuroki, Hidenori

PY - 2000/8

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