Premium
Formation, Powder Characterization and Sintering of MgCr2O4 by the Hydrazine Method
Author(s) -
Yoshida Noriyuki,
Takano Yoshihiko,
Yoshinaka Masaru,
Hirota Ken,
Yamaguchi Osamu
Publication year - 1998
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.1151-2916.1998.tb02612.x
Subject(s) - spark plasma sintering , materials science , sintering , hydrazine (antidepressant) , particle size , fracture toughness , morphology (biology) , amorphous solid , ceramic , particle (ecology) , characterization (materials science) , composite material , grain size , hexagonal crystal system , metallurgy , chemical engineering , crystallography , chemistry , nanotechnology , chromatography , genetics , oceanography , biology , engineering , geology
Picrochromite (MgCr 2 O 4 ) crystallizes at 480° to 530°C from an amorphous material prepared by the hydrazine method. The MgCr 2 O 4 powders were characterized for particle size and surface area. Individual particles tend toward a hexagonal morphology above 1000°C. Dense MgCr 2 O 4 ceramics (99.5% of theoretical) with an average grain size of 2 μm have been fabricated by spark plasma sintering for 5 min at 1400°C and 30 MPa. Their fracture toughness and bending strength are 3.7 MPa·m 1/2 and 310 MPa, respectively.