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Baghaei, Ali; Nourbakhsh, Amir A.; Ebrahimi Kahrizsangi, Reza; Salvini, Vânia R.
International journal of applied ceramic technology, May/June 2020, 20200501, Letnik: 17, Številka: 3Journal Article
Al2O3‐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‐Al2O3 and/or nano‐TiO2 to the composition of Al2O3‐C filters was investigated. Uniaxially pressed Al2O3‐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‐Al2O3 particles in the composition led to an increase in the cold crushing strength (CCS) due to the formation of the Al3CON phase which acts as a chemical bonding between Al2O3 particles and the carbonaceous matrix. On the other hand, the addition of 1.0 wt% of nano‐TiO2 in the composition caused an increase of 50% in the hot modulus of rupture (HMOR), attributed to the formation of columnar Al2O3 grains in the microstructure.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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