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Disperse Equiaxed α‐Al 2 O 3 Nanoparticles Without Vermicular Microstructure
Author(s) -
Cao Wenbin,
Guo Ruiyun,
Pu Sanxu,
Zhang Wei,
Li Lu,
Guo Qian,
Li Jiangong
Publication year - 2016
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/jace.14147
Subject(s) - equiaxed crystals , microstructure , materials science , nanocrystalline material , nanoparticle , chemical engineering , composite number , metallurgy , sintering , calcination , impurity , ceramic , composite material , nanotechnology , chemistry , organic chemistry , catalysis , engineering
Nanocrystalline microstructure is regarded as a strategic approach to overcome the brittleness of alumina ceramics, and the preparation of disperse equiaxed α‐Al 2 O 3 nanoparticles is an essential step for the preparation of nanocrystalline alumina ceramics. In this work, disperse equiaxed α‐Al 2 O 3 nanoparticles were prepared using α‐Fe 2 O 3 as seed and isolation phase. At first, the composite of α‐Al 2 O 3 nanoparticles embedded in α‐Fe 2 O 3 matrix was obtained by calcining the precursor powder containing γ‐Al OOH and Fe( OH ) 3 (Fe 3+ /Al 3+ mole ratio of 5) at 770°C for 2 h. Then disperse equiaxed α‐Al 2 O 3 nanoparticles with a mean size of 12 nm and a size distribution from 2 to 40 nm without vermicular microstructure were obtained by removal of α‐Fe 2 O 3 and other impurities in the composite through acid corrosion.