Fabrication and mechanical properties of Cr{sub 2}O{sub 3} solid solution ceramics in the system Cr{sub 2}O{sub 3}-Al{sub 2}O{sub 3}

Journal Article · Thu May 01 00:00:00 EDT 1997 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(97)00015-9· OSTI ID:509200

Shibata, K; Yoshinaka, M; Hirota, K; Yamaguchi, O ^[1]

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1. Doshisha Univ., Tanabe Kyoto (Japan)

In the system Cr{sub 2}O{sub 3}-Al{sub 2}O{sub 3}, Cr{sub 2}O{sub 3} solid solution (ss) powders containing up to 25 mol% A/l{sub 2}O{sub 3} have been prepared by the hydrazine method. Dense Cr{sub 2}O{sub 3}(ss) ceramics (99--99.2% of theoretical) have been fabricated by HIPing (1,500 C/2h/196MPa) of the compacts sealed under reduced pressure. Their mechanical data are discussed, in comparison with those of Al{sub 2}O{sub 3}(ss) ceramics in this system. Microhardness (23.4 GPa) and fracture toughness (3.9 MPa{center_dot}m{sup 1/2}) are not dependent on the compositions of Cr{sub 2}O{sub 3}(ss) ceramics. The former value is higher than that of much improved Al{sub 2}O{sub 3} content; the maximum value of 380 MPa is achieved in the ceramics containing 25 mol% Al{sub 2}O{sub 3}.

• OSTI ID: 509200
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 5 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CHROMIUM OXIDES
FLEXURAL STRENGTH
FRACTURE PROPERTIES
HOT PRESSING
MECHANICAL PROPERTIES
MICROHARDNESS
SOLID SOLUTIONS