Physical Properties of Sintered Alumina Doped with Different Oxides
2018
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Authors
Filipović, SuzanaObradović, Nina
Marković, Smilja
Đorđević, Antonije
Balać, Igor
Dapčević, Aleksandra
Rogan, Jelena
Pavlović, Vladimir B.
Article (Published version)
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Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respec...tively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.
Keywords:
Mechanical activation / Densities / SEM / Sintering / AluminaSource:
Science of Sintering, 2018, 50, 4, 409-419Publisher:
- Međunarodni Institut za nauku o sinterovanju, Beograd
Funding / projects:
- Directed synthesis, structure and properties of multifunctional materials (RS-MESTD-Basic Research (BR or ON)-172057)
- Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45007)
- Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45019)
DOI: 10.2298/SOS1804409F
ISSN: 0350-820X
WoS: 000455876800003
Scopus: 2-s2.0-85062894934
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Filipović, Suzana AU - Obradović, Nina AU - Marković, Smilja AU - Đorđević, Antonije AU - Balać, Igor AU - Dapčević, Aleksandra AU - Rogan, Jelena AU - Pavlović, Vladimir B. PY - 2018 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3909 AB - Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures. PB - Međunarodni Institut za nauku o sinterovanju, Beograd T2 - Science of Sintering T1 - Physical Properties of Sintered Alumina Doped with Different Oxides EP - 419 IS - 4 SP - 409 VL - 50 DO - 10.2298/SOS1804409F ER -
@article{ author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Đorđević, Antonije and Balać, Igor and Dapčević, Aleksandra and Rogan, Jelena and Pavlović, Vladimir B.", year = "2018", abstract = "Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.", publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd", journal = "Science of Sintering", title = "Physical Properties of Sintered Alumina Doped with Different Oxides", pages = "419-409", number = "4", volume = "50", doi = "10.2298/SOS1804409F" }
Filipović, S., Obradović, N., Marković, S., Đorđević, A., Balać, I., Dapčević, A., Rogan, J.,& Pavlović, V. B.. (2018). Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering Međunarodni Institut za nauku o sinterovanju, Beograd., 50(4), 409-419. https://doi.org/10.2298/SOS1804409F
Filipović S, Obradović N, Marković S, Đorđević A, Balać I, Dapčević A, Rogan J, Pavlović VB. Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering. 2018;50(4):409-419. doi:10.2298/SOS1804409F .
Filipović, Suzana, Obradović, Nina, Marković, Smilja, Đorđević, Antonije, Balać, Igor, Dapčević, Aleksandra, Rogan, Jelena, Pavlović, Vladimir B., "Physical Properties of Sintered Alumina Doped with Different Oxides" in Science of Sintering, 50, no. 4 (2018):409-419, https://doi.org/10.2298/SOS1804409F . .