Hot pressing of Cr{sub 2}O{sub 3} powder with thin hexagonal plate particles
Journal Article
·
· Materials Research Bulletin
- Doshisha Univ., Tanabe, Kyoto (Japan). Dept. of Molecular Science and Technology
Chromium oxide (Cr{sub 2}O{sub 3}) powders with thin hexagonal plate particles have been obtained at 1,200 C to 1,400 C from an amorphous material prepared by adding hydrazine monohydrate to the aqueous solution of chromium nitrate. Tablets molded by wet-uniaxial-pressing were hot-pressed for 2 h at 1,500 C and 30 MPa. The dense sintered Cr{sub 2}O{sub 3} ceramics (>98% of theoretical) obtained had crystal-orientation, in which a <001> axis was parallel to the pressing direction. They exhibited an anisotropy in electrical conductivity, s; the values measured at 700 C in the perpendicular and parallel directions for the <001> axis were 5.5 and 0.58 S-m{sup {minus}1}, respectively. Vickers hardness, HV, and fracture toughness, KIC, were 24.1 GPa and 4.6 MPa{center_dot}m{sup 1/2}, respectively.
- OSTI ID:
- 367309
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 8 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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