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Hot Isostatic Pressing and Characterization of Sol‐Gel‐Derived Chromium(III) Oxide
Author(s) -
Kawabata Akio,
Yoshinaka Masaru,
Hirota Ken,
Yamaguchi Osamu
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08655.x
Subject(s) - hot isostatic pressing , materials science , chromium , amorphous solid , oxide , pellets , fracture toughness , aqueous solution , electrical resistivity and conductivity , metallurgy , mineralogy , composite material , sintering , crystallography , chemistry , electrical engineering , engineering
Chromium (III) oxide (Cr 2 O 3 ) crystallizes at low temperatures from an amorphous material prepared by adding hydrazine monohydrate to an aqueous solution of Cr(NO 3 ) 3 ‐9H 2 O. Individual particles of Cr 2 O 3 tend toward a hexagonal morphology above 800°C. Well‐densified Cr 2 O 3 pellets (98.8% of theoretical density) have been fabricated by hot isostatic pressing for 2 h at 1100°C and 196 MPa. Their fracture toughness is 4.4 MPa.m 1/2 . The sample annealed in air for 12 h at 1300°C exhibits a high electrical conductivity of 3.6 Ω ‐1 .m ‐1 at 700°C.