Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time
Samo za registrovane korisnike
2020
Autori
Karamanov, AlexanderSmiljanić, Sonja

Karamanova, Emilia
Matijašević, Srđan D.
Nikolić, Jelena
Savić, Veljko
Grujić, Snežana

Članak u časopisu (Objavljena verzija)

Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Sintering, crystallization and foaming of nano glass powders with composition La2O3 center dot SrO center dot 5B(2)O(3) were studied by hot stage microscopy (HSM) and simultaneous thermal analysis (DTA-TG) under non-isothermal regime at 10 degrees C/min and by optical contactless dilatometer under isothermal conditions at 700 degrees C up to 10 hours for different times. After the thermal treatments, specimens were characterized by gas pycnometry, X-ray Powder Diffraction (XRD) and Field Emission Scanning Electron Microscopes (FE-SEM). The results demonstrate that the densification completed before the crystallization process, thus forming well sintered samples. Then, during the phase formation gas is released, which leads to foaming process. After holding of 160 minutes at 700 degrees C the degree of crystallization reached about 0.8 and the foaming stopped. The obtained sample had high closed porosity and quite intriguing structure composed of two fairly different crystal arrangement...s. The first was "sponge-like", while the second was denser and consisted of "sheets", 10-30 nm thick. The subsequent holding led to re-crystallization, formation of larger denser zones that reached even 10-15 mu m and an increase in open porosity. These results highlight that in the case of sinter crystallization of nano powders, some intriguing features can be expected.
Ključne reči:
Sintering / Glass-ceramic / StructureIzvor:
Journal of Non-Crystalline Solids, 2020, 544Izdavač:
- Elsevier, Amsterdam
Finansiranje / projekti:
- Bulgarian Academy of Sciences [DH19/7]
- Razvoj stakala sa kontrolisanim otpuštanjem jona za primenu u poljoprivredi i medicini (RS-34001)
- Fenomeni i procesi sinteze novih staklastih i nanostrukturnih staklo-keramičkih materijala (RS-172004)
DOI: 10.1016/j.jnoncrysol.2020.120168
ISSN: 0022-3093
WoS: 000558085500010
Scopus: 2-s2.0-85085738696
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Karamanov, Alexander AU - Smiljanić, Sonja AU - Karamanova, Emilia AU - Matijašević, Srđan D. AU - Nikolić, Jelena AU - Savić, Veljko AU - Grujić, Snežana PY - 2020 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4386 AB - Sintering, crystallization and foaming of nano glass powders with composition La2O3 center dot SrO center dot 5B(2)O(3) were studied by hot stage microscopy (HSM) and simultaneous thermal analysis (DTA-TG) under non-isothermal regime at 10 degrees C/min and by optical contactless dilatometer under isothermal conditions at 700 degrees C up to 10 hours for different times. After the thermal treatments, specimens were characterized by gas pycnometry, X-ray Powder Diffraction (XRD) and Field Emission Scanning Electron Microscopes (FE-SEM). The results demonstrate that the densification completed before the crystallization process, thus forming well sintered samples. Then, during the phase formation gas is released, which leads to foaming process. After holding of 160 minutes at 700 degrees C the degree of crystallization reached about 0.8 and the foaming stopped. The obtained sample had high closed porosity and quite intriguing structure composed of two fairly different crystal arrangements. The first was "sponge-like", while the second was denser and consisted of "sheets", 10-30 nm thick. The subsequent holding led to re-crystallization, formation of larger denser zones that reached even 10-15 mu m and an increase in open porosity. These results highlight that in the case of sinter crystallization of nano powders, some intriguing features can be expected. PB - Elsevier, Amsterdam T2 - Journal of Non-Crystalline Solids T1 - Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time VL - 544 DO - 10.1016/j.jnoncrysol.2020.120168 ER -
@article{ author = "Karamanov, Alexander and Smiljanić, Sonja and Karamanova, Emilia and Matijašević, Srđan D. and Nikolić, Jelena and Savić, Veljko and Grujić, Snežana", year = "2020", abstract = "Sintering, crystallization and foaming of nano glass powders with composition La2O3 center dot SrO center dot 5B(2)O(3) were studied by hot stage microscopy (HSM) and simultaneous thermal analysis (DTA-TG) under non-isothermal regime at 10 degrees C/min and by optical contactless dilatometer under isothermal conditions at 700 degrees C up to 10 hours for different times. After the thermal treatments, specimens were characterized by gas pycnometry, X-ray Powder Diffraction (XRD) and Field Emission Scanning Electron Microscopes (FE-SEM). The results demonstrate that the densification completed before the crystallization process, thus forming well sintered samples. Then, during the phase formation gas is released, which leads to foaming process. After holding of 160 minutes at 700 degrees C the degree of crystallization reached about 0.8 and the foaming stopped. The obtained sample had high closed porosity and quite intriguing structure composed of two fairly different crystal arrangements. The first was "sponge-like", while the second was denser and consisted of "sheets", 10-30 nm thick. The subsequent holding led to re-crystallization, formation of larger denser zones that reached even 10-15 mu m and an increase in open porosity. These results highlight that in the case of sinter crystallization of nano powders, some intriguing features can be expected.", publisher = "Elsevier, Amsterdam", journal = "Journal of Non-Crystalline Solids", title = "Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time", volume = "544", doi = "10.1016/j.jnoncrysol.2020.120168" }
Karamanov, A., Smiljanić, S., Karamanova, E., Matijašević, S. D., Nikolić, J., Savić, V.,& Grujić, S.. (2020). Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time. in Journal of Non-Crystalline Solids Elsevier, Amsterdam., 544. https://doi.org/10.1016/j.jnoncrysol.2020.120168
Karamanov A, Smiljanić S, Karamanova E, Matijašević SD, Nikolić J, Savić V, Grujić S. Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time. in Journal of Non-Crystalline Solids. 2020;544. doi:10.1016/j.jnoncrysol.2020.120168 .
Karamanov, Alexander, Smiljanić, Sonja, Karamanova, Emilia, Matijašević, Srđan D., Nikolić, Jelena, Savić, Veljko, Grujić, Snežana, "Sintering, crystallization and foaming of La2O3 center dot SrO center dot 5B(2)O(3) glass powders: effect of the holding time" in Journal of Non-Crystalline Solids, 544 (2020), https://doi.org/10.1016/j.jnoncrysol.2020.120168 . .