Synthesis and Properties of Al2O3-Fe2O3 Ceramic Composite with Limited Electrical Conductivity
G. R. KARAGEDOV1, A. A. KRASNOV2,3, A. E. LEVICHEV2, E. V. MAMOSHKINA2
1Institute of Solid State Chemistry and Mechanochemistry, SB RAS, Novosibirsk, Russia
2Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
3Novosibirsk State University, Novosibirsk, Russia
Keywords: оксид алюминия, керамика, композит, электропроводность, alumina, ceramics, composite, electrical conductivity
Pages: 131-137
Abstract
Ceramic materials with a density of more than 95% of theoretical containing 1-30 mass % of iron oxide were synthesized in the Al2O3-Fe2O3 system. During ceramics air sintering, the material with Fe2O3 content below 10 % is monophase and comprises of α-Al2O3-based solid solution. With Fe2O3 concentration above 10%, iron oxide-based solution is generated in significant amounts. As soon as the material becomes two-phase, the value of its electrical conductivity increases by three orders of magnitude and reaches 10-8-10-9 Sm/m. Iron oxide is reduced to metal when trying to increase material density by vacuum sintering or hot isostatic pressing. Furthermore, a composite representing uniformly distributed spherical metallic iron particles in the α-Al2O3 matrix is generated.
DOI: 10.15372/CSD20180204
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