Mechanical properties and micro structure of centrifugally compacted alumina and hot-isostatically-pressed alumina

J. Koike, Shunzo Tashima, S. Wakiya, K. Maruyama, H. Oikawa

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26 Citations (Scopus)

Abstract

High purity alumina powder was compacted under a high centrifugal force. Mechanical properties of the sintered body were studied by the three-point bending test at room temperature and by the compressive test at elevated temperatures. Comparison was made with hot-isostatically-pressed (HIP) alumina. The room-temperature flexural strength of the centrifugally compacted (CC) alumina was found to be 1330 MPa compared with 585 MPa of the HIP alumina. The difference in the room-temperature strength was attributed to the presence of the amorphous phase along the grain boundaries of the HIP alumina caused by the segregation of carbon and sulfur during HIP. A large ductility was observed above 1473 K in the CC alumina and above 1573 K in the HIP alumina. High-temperature ductility was lost in the HIP alumina at 1773 K where the amorphous grain-boundary phase was considered to be melted.

Original languageEnglish
Pages (from-to)26-34
Number of pages9
JournalMaterials Science and Engineering A
Volume220
Issue number1-2
DOIs
Publication statusPublished - Dec 15 1996
Externally publishedYes

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Keywords

  • Alumina
  • Centrifugal compaction
  • Grain-boundary phase
  • Mechanical property

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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