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

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

Research output: Contribution to journalArticle

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

Fingerprint

Aluminum Oxide
Alumina
aluminum oxides
mechanical properties
Mechanical properties
microstructure
Microstructure
ductility
Ductility
Grain boundaries
room temperature
Temperature
grain boundaries
centrifugal force
flexural strength
Bending tests
Sulfur
Bending strength
Powders
purity

Keywords

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

ASJC Scopus subject areas

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

Cite this

Mechanical properties and micro structure of centrifugally compacted alumina and hot-isostatically-pressed alumina. / Koike, J.; Tashima, Shunzo; Wakiya, S.; Maruyama, K.; Oikawa, H.

In: Materials Science and Engineering A, Vol. 220, No. 1-2, 15.12.1996, p. 26-34.

Research output: Contribution to journalArticle

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