Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties
Apstrakt
Silicon nitride-based compositions containing zirconia and ceria additives were prepared by hot pressing in argon atmosphere. The compositions studied can be divided into two groups: (a) with a constant total amount of ZrO2 + CeO2 additive (32 mol.%) within which the CeO2 content was varied from 0 to 6.2 mol.%, and (b) with various contents (10 to 42 mol.%) of ZrO2 + CeO2 additive, the ratio of ZrO2 to CeO2 staying constant at a level of 7.35 : 1. Phase compositions were determined by X-ray powder diffraction (XRD), while energy-dispersive X-ray microanalysis (EDX) was used for compositional analysis of the ZrO2 grains. The results showed that after sintering the Ce4+ ions were reduced to Ce3+. At low initial ceria concentrations, Si2N2O was formed beside beta -Si3N4 and ZrO2 (the majority of which was monoclinic). At higher ceria concentrations, however, Si2N2O disappeared by reaction with ceria and silica to form Ce-N apatite. Nitrogen-containing zirconia phases were not found in the... studied compositions, up to 1750 degreesC.
Ključne reči:
Si3N4-ZrO2-CeO2 system / fracture toughness / hardnessIzvor:
Zeitschrift fur Metallkunde, 2001, 92, 8, 942-945Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Bošković, Snežana B. AU - Sigulinski, F AU - Rixecker, G AU - Aldinger, F PY - 2001 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2463 AB - Silicon nitride-based compositions containing zirconia and ceria additives were prepared by hot pressing in argon atmosphere. The compositions studied can be divided into two groups: (a) with a constant total amount of ZrO2 + CeO2 additive (32 mol.%) within which the CeO2 content was varied from 0 to 6.2 mol.%, and (b) with various contents (10 to 42 mol.%) of ZrO2 + CeO2 additive, the ratio of ZrO2 to CeO2 staying constant at a level of 7.35 : 1. Phase compositions were determined by X-ray powder diffraction (XRD), while energy-dispersive X-ray microanalysis (EDX) was used for compositional analysis of the ZrO2 grains. The results showed that after sintering the Ce4+ ions were reduced to Ce3+. At low initial ceria concentrations, Si2N2O was formed beside beta -Si3N4 and ZrO2 (the majority of which was monoclinic). At higher ceria concentrations, however, Si2N2O disappeared by reaction with ceria and silica to form Ce-N apatite. Nitrogen-containing zirconia phases were not found in the studied compositions, up to 1750 degreesC. T2 - Zeitschrift fur Metallkunde T1 - Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties VL - 92 IS - 8 SP - 942 EP - 945 UR - https://hdl.handle.net/21.15107/rcub_vinar_2463 ER -
@article{ author = "Bošković, Snežana B. and Sigulinski, F and Rixecker, G and Aldinger, F", year = "2001", abstract = "Silicon nitride-based compositions containing zirconia and ceria additives were prepared by hot pressing in argon atmosphere. The compositions studied can be divided into two groups: (a) with a constant total amount of ZrO2 + CeO2 additive (32 mol.%) within which the CeO2 content was varied from 0 to 6.2 mol.%, and (b) with various contents (10 to 42 mol.%) of ZrO2 + CeO2 additive, the ratio of ZrO2 to CeO2 staying constant at a level of 7.35 : 1. Phase compositions were determined by X-ray powder diffraction (XRD), while energy-dispersive X-ray microanalysis (EDX) was used for compositional analysis of the ZrO2 grains. The results showed that after sintering the Ce4+ ions were reduced to Ce3+. At low initial ceria concentrations, Si2N2O was formed beside beta -Si3N4 and ZrO2 (the majority of which was monoclinic). At higher ceria concentrations, however, Si2N2O disappeared by reaction with ceria and silica to form Ce-N apatite. Nitrogen-containing zirconia phases were not found in the studied compositions, up to 1750 degreesC.", journal = "Zeitschrift fur Metallkunde", title = "Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties", volume = "92", number = "8", pages = "942-945", url = "https://hdl.handle.net/21.15107/rcub_vinar_2463" }
Bošković, S. B., Sigulinski, F., Rixecker, G.,& Aldinger, F.. (2001). Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties. in Zeitschrift fur Metallkunde, 92(8), 942-945. https://hdl.handle.net/21.15107/rcub_vinar_2463
Bošković SB, Sigulinski F, Rixecker G, Aldinger F. Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties. in Zeitschrift fur Metallkunde. 2001;92(8):942-945. https://hdl.handle.net/21.15107/rcub_vinar_2463 .
Bošković, Snežana B., Sigulinski, F, Rixecker, G, Aldinger, F, "Ceramics in the Si3N4-ZrO2-CeO2 system: Phase composition changes and properties" in Zeitschrift fur Metallkunde, 92, no. 8 (2001):942-945, https://hdl.handle.net/21.15107/rcub_vinar_2463 .