Sintering of silicon nitride with Mg-exchange zeolite additive
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Autori
Matović, BrankoŠaponjić, Aleksandra
Pošarac, Milica B.
Devečerski, Aleksandar
Radosavljević-Mihajlović, Ana S.
Volceanov, E.
Bošković, Snežana B.
Članak u časopisu
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The possibility of using Mg-exchanged zeolite as additive for densification of Si3N4 ceramic was studied. The zeolitic precursor was previously heated at 800 degrees C to obtain an amorphous powder with a composition corresponding to MgO center dot Al2O3-nSiO(2). The powder was mixed with Si3N4 and the sintering additive was homogenized by attrition milling in the presence of isopropanol and finally compacted by cold isostatic pressure. Pushrod dilatometry was used to measure the shrinkage behaviour of green bodies under a nitrogen atmosphere from room temperature to 1500 degrees C. The chemical reactions and phase evolution during pressureless sintering were also followed by means of X-ray and dilatometric analysis. Results show that the first liquid forms as low as 1070 degrees C, sharing in a significant reduction of sintering temperature. The final phase composition obtained at 1500 degrees C consist of crystalline alpha-Si3N4 phase which is emended in oxynitride glassy phase The r...esults show that the Mg-exchanged zeolite is a very effective low-temperature sintering additive for silicon nitride.
Ključne reči:
silicon nitride / zeolite / dilatometry / sinteringIzvor:
Journal of Optoelectronics and Advanced Materials, 2008, 10, 4, 880-882Napomena:
- 5th International Conference on New Research Trends in Materials Science, Sep, 2007, Sibiu, Romania
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Institucija/grupa
VinčaTY - JOUR AU - Matović, Branko AU - Šaponjić, Aleksandra AU - Pošarac, Milica B. AU - Devečerski, Aleksandar AU - Radosavljević-Mihajlović, Ana S. AU - Volceanov, E. AU - Bošković, Snežana B. PY - 2008 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6749 AB - The possibility of using Mg-exchanged zeolite as additive for densification of Si3N4 ceramic was studied. The zeolitic precursor was previously heated at 800 degrees C to obtain an amorphous powder with a composition corresponding to MgO center dot Al2O3-nSiO(2). The powder was mixed with Si3N4 and the sintering additive was homogenized by attrition milling in the presence of isopropanol and finally compacted by cold isostatic pressure. Pushrod dilatometry was used to measure the shrinkage behaviour of green bodies under a nitrogen atmosphere from room temperature to 1500 degrees C. The chemical reactions and phase evolution during pressureless sintering were also followed by means of X-ray and dilatometric analysis. Results show that the first liquid forms as low as 1070 degrees C, sharing in a significant reduction of sintering temperature. The final phase composition obtained at 1500 degrees C consist of crystalline alpha-Si3N4 phase which is emended in oxynitride glassy phase The results show that the Mg-exchanged zeolite is a very effective low-temperature sintering additive for silicon nitride. T2 - Journal of Optoelectronics and Advanced Materials T1 - Sintering of silicon nitride with Mg-exchange zeolite additive VL - 10 IS - 4 SP - 880 EP - 882 UR - https://hdl.handle.net/21.15107/rcub_vinar_6749 ER -
@article{ author = "Matović, Branko and Šaponjić, Aleksandra and Pošarac, Milica B. and Devečerski, Aleksandar and Radosavljević-Mihajlović, Ana S. and Volceanov, E. and Bošković, Snežana B.", year = "2008", abstract = "The possibility of using Mg-exchanged zeolite as additive for densification of Si3N4 ceramic was studied. The zeolitic precursor was previously heated at 800 degrees C to obtain an amorphous powder with a composition corresponding to MgO center dot Al2O3-nSiO(2). The powder was mixed with Si3N4 and the sintering additive was homogenized by attrition milling in the presence of isopropanol and finally compacted by cold isostatic pressure. Pushrod dilatometry was used to measure the shrinkage behaviour of green bodies under a nitrogen atmosphere from room temperature to 1500 degrees C. The chemical reactions and phase evolution during pressureless sintering were also followed by means of X-ray and dilatometric analysis. Results show that the first liquid forms as low as 1070 degrees C, sharing in a significant reduction of sintering temperature. The final phase composition obtained at 1500 degrees C consist of crystalline alpha-Si3N4 phase which is emended in oxynitride glassy phase The results show that the Mg-exchanged zeolite is a very effective low-temperature sintering additive for silicon nitride.", journal = "Journal of Optoelectronics and Advanced Materials", title = "Sintering of silicon nitride with Mg-exchange zeolite additive", volume = "10", number = "4", pages = "880-882", url = "https://hdl.handle.net/21.15107/rcub_vinar_6749" }
Matović, B., Šaponjić, A., Pošarac, M. B., Devečerski, A., Radosavljević-Mihajlović, A. S., Volceanov, E.,& Bošković, S. B.. (2008). Sintering of silicon nitride with Mg-exchange zeolite additive. in Journal of Optoelectronics and Advanced Materials, 10(4), 880-882. https://hdl.handle.net/21.15107/rcub_vinar_6749
Matović B, Šaponjić A, Pošarac MB, Devečerski A, Radosavljević-Mihajlović AS, Volceanov E, Bošković SB. Sintering of silicon nitride with Mg-exchange zeolite additive. in Journal of Optoelectronics and Advanced Materials. 2008;10(4):880-882. https://hdl.handle.net/21.15107/rcub_vinar_6749 .
Matović, Branko, Šaponjić, Aleksandra, Pošarac, Milica B., Devečerski, Aleksandar, Radosavljević-Mihajlović, Ana S., Volceanov, E., Bošković, Snežana B., "Sintering of silicon nitride with Mg-exchange zeolite additive" in Journal of Optoelectronics and Advanced Materials, 10, no. 4 (2008):880-882, https://hdl.handle.net/21.15107/rcub_vinar_6749 .