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Correlation of microstructure and mechanical properties of Al 2 O 3 ‐C bodies containing Nano‐Al 2 O 3 and Nano‐TiO 2 additives
Author(s) -
Baghaei Ali,
Nourbakhsh Amir A.,
Ebrahimi Kahrizsangi Reza,
Salvini Vânia R.
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13435
Subject(s) - materials science , microstructure , ingot , nano , sintering , composite material , casting , aluminium , metallurgy , filtration (mathematics) , chemical engineering , alloy , statistics , mathematics , engineering
Al 2 O 3 ‐C foam filters have been successfully used for steel and aluminum melts filtration. Improving the high‐temperature mechanical properties enhances the capability and application of these filters for the filtration of large steel casting parts along with ingot casting or continuous casting of steel for long periods of time. In this study, adding nano‐Al 2 O 3 and/or nano‐TiO 2 to the composition of Al 2 O 3 ‐C filters was investigated. Uniaxially pressed Al 2 O 3 ‐C samples containing additives in the range from 0 to 1.0 wt% of nano‐oxides were prepared. The physical and mechanical properties, as well as microstructural analysis, were measured after sintering at 1600°C for 5 hours under a petroleum coke bed. The results showed that the presence of nano‐Al 2 O 3 particles in the composition led to an increase in the cold crushing strength (CCS) due to the formation of the Al 3 CON phase which acts as a chemical bonding between Al 2 O 3 particles and the carbonaceous matrix. On the other hand, the addition of 1.0 wt% of nano‐TiO 2 in the composition caused an increase of 50% in the hot modulus of rupture (HMOR), attributed to the formation of columnar Al 2 O 3 grains in the microstructure.