FORMATION, POWDER CHARACTERIZATION AND SINTERING OF MGCR2O4 BY THE HYDRAZINE METHOD

Authors
YOSHIDA N TAKANO Y YOSHINAKA M HIROTA K YAMAGUCHI O
Citation
N. Yoshida et al., FORMATION, POWDER CHARACTERIZATION AND SINTERING OF MGCR2O4 BY THE HYDRAZINE METHOD, Journal of the American Ceramic Society, 81(8), 1998, pp. 2213-2215
Citations number
13
Categorie Soggetti
Material Science, Ceramics
Journal title
Journal of the American Ceramic Society → ACNP
ISSN journal
00027820
Volume
81
Issue
8
Year of publication
1998
Pages
2213 - 2215
Database
ISI
SICI code
0002-7820(1998)81:8<2213:FPCASO>2.0.ZU;2-X
Abstract
Picrochromite (MgCr2O4) crystallizes at 480 degrees to 530 degrees C f rom an amorphous material prepared by the hydrazine method. The MgCr2O 4 powders were characterized for particle size and surface area. Indiv idual particles tend toward a hexagonal morphology above 1000 degrees C. Dense MgCr2O4 ceramics (99.5% of theoretical) with an average grain size of 2 mu m have been fabricated by spark plasma sintering for 5 m in at 1400 degrees C and 30 MPa. Their fracture toughness and bending strength are 3.7 MPa.m(1/2) and 310 MPa, respectively.