Premium
Preparation and Characterization of Fine‐Grained 3Y‐TZP/BaFe 12 O 19 In Situ Composites
Author(s) -
Suzuki Yoshikazu,
Awano Masanobu,
Kondo Naoki,
Ohji Tatsuki
Publication year - 1999
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.1151-2916.1999.tb02121.x
Subject(s) - materials science , coercivity , composite number , sintering , composite material , grain size , microstructure , cubic zirconia , phase (matter) , ferromagnetism , ceramic , chemistry , physics , organic chemistry , quantum mechanics , condensed matter physics
Composites of BaFe 12 O 19 particles dispersed throughout a 3‐mol%‐yttria‐doped zirconia (3Y‐TZP) matrix have been prepared using the pressureless reactive sintering of 3Y‐TZP, BaCO 3 , and γ‐Fe 2 O 3 powders. The reaction behavior of the mixed powder was studied with an in situ , high‐temperature powder X‐ray diffraction technique. The composite that was sintered at 1300°C consisted of submicrometer‐sized 3Y‐TZP grains and BaFe 12 O 19 particles; the size of the 3Y‐TZP grains was ∼100‐300 nm, and the size of the BaFe 12 O 19 particles was ∼200‐500 nm. Based on the grain size, most of the BaFe 12 O 19 grains presumably had a single‐magnetic‐domain structure. The 3Y‐TZP/20‐wt%‐BaFe 12 O 19 composite showed high magnetization and coercivity values, despite the low concentration of ferromagnetic phase. Preliminary mechanical tests revealed that the composite possessed moderately good mechanical properties.