Formation, Powder Characterization and Sintering of MgCr2O4 by the Hydrazine Method |
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| Authors: | Noriyuki Yoshida Yoshihiko Takano Masaru Yoshinaka Ken Hirota Osamu Yamaguchi |
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| Affiliation: | Department of Molecular Science and Technology, Doshisha University, Kyo-Tanabe Kyoto 610-0321, Japan;Tanaka Galvanizing Co. Ltd., Nishiyodogawa-Ku Osaka 555-0012, Japan |
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| Abstract: | Picrochromite (MgCr2O4) crystallizes at 480° to 530°C from an amorphous material prepared by the hydrazine method. The MgCr2O4 powders were characterized for particle size and surface area. Individual particles tend toward a hexagonal morphology above 1000°C. Dense MgCr2O4 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·m1/2 and 310 MPa, respectively. |
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