Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis
Abstract
Synthesis of high-purity submicrometer spherical particles of oc-alumina is performed by ultrasonic spray pyrolysis. As precursors, 0.5 M water solutions of both AlCl3 . 6H(2)O and Al(NO3)(3) . 9H(2)O have been used. The influence of aerosol droplet genesis on the particle size distribution of alpha-alumina is regarded as a main control parameter. In the case of very fine droplets (smaller than 0.3 mu m), regardless of the precursor, the precipitation of dissolved compound inside the droplet occurs by the volume precipitation mechanism. Morphology of the particles corresponds to that of the realized aerosol droplets. An increased activity of produced powders enables the phase transformation of gamma- to alpha-alumina in the temperature range 1073 similar to 1173 K, while at 1273 K the transformation process is complete.
Keywords:
ultrasonic spray pyrolysis / spherical Al2O3 powders / ultrafine particle morphology / synthesis / phase transformation / particle size distributionSource:
Materials Transactions Jim, 1996, 37, 4, 627-635Publisher:
- Japan Inst Metals & Materials, Sendai
DOI: 10.2320/matertrans1989.37.627
ISSN: 0916-1821
WoS: A1996UR12300010
Scopus: 2-s2.0-0030122692
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Jokanović, Vukoman AU - Janaćković, Đorđe AU - Spasić, Aleksandar AU - Uskoković, Dragan PY - 1996 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/95 AB - Synthesis of high-purity submicrometer spherical particles of oc-alumina is performed by ultrasonic spray pyrolysis. As precursors, 0.5 M water solutions of both AlCl3 . 6H(2)O and Al(NO3)(3) . 9H(2)O have been used. The influence of aerosol droplet genesis on the particle size distribution of alpha-alumina is regarded as a main control parameter. In the case of very fine droplets (smaller than 0.3 mu m), regardless of the precursor, the precipitation of dissolved compound inside the droplet occurs by the volume precipitation mechanism. Morphology of the particles corresponds to that of the realized aerosol droplets. An increased activity of produced powders enables the phase transformation of gamma- to alpha-alumina in the temperature range 1073 similar to 1173 K, while at 1273 K the transformation process is complete. PB - Japan Inst Metals & Materials, Sendai T2 - Materials Transactions Jim T1 - Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis EP - 635 IS - 4 SP - 627 VL - 37 DO - 10.2320/matertrans1989.37.627 ER -
@article{ author = "Jokanović, Vukoman and Janaćković, Đorđe and Spasić, Aleksandar and Uskoković, Dragan", year = "1996", abstract = "Synthesis of high-purity submicrometer spherical particles of oc-alumina is performed by ultrasonic spray pyrolysis. As precursors, 0.5 M water solutions of both AlCl3 . 6H(2)O and Al(NO3)(3) . 9H(2)O have been used. The influence of aerosol droplet genesis on the particle size distribution of alpha-alumina is regarded as a main control parameter. In the case of very fine droplets (smaller than 0.3 mu m), regardless of the precursor, the precipitation of dissolved compound inside the droplet occurs by the volume precipitation mechanism. Morphology of the particles corresponds to that of the realized aerosol droplets. An increased activity of produced powders enables the phase transformation of gamma- to alpha-alumina in the temperature range 1073 similar to 1173 K, while at 1273 K the transformation process is complete.", publisher = "Japan Inst Metals & Materials, Sendai", journal = "Materials Transactions Jim", title = "Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis", pages = "635-627", number = "4", volume = "37", doi = "10.2320/matertrans1989.37.627" }
Jokanović, V., Janaćković, Đ., Spasić, A.,& Uskoković, D.. (1996). Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis. in Materials Transactions Jim Japan Inst Metals & Materials, Sendai., 37(4), 627-635. https://doi.org/10.2320/matertrans1989.37.627
Jokanović V, Janaćković Đ, Spasić A, Uskoković D. Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis. in Materials Transactions Jim. 1996;37(4):627-635. doi:10.2320/matertrans1989.37.627 .
Jokanović, Vukoman, Janaćković, Đorđe, Spasić, Aleksandar, Uskoković, Dragan, "Synthesis and formation mechanism of ultrafine spherical Al2O3 powders by ultrasonic spray pyrolysis" in Materials Transactions Jim, 37, no. 4 (1996):627-635, https://doi.org/10.2320/matertrans1989.37.627 . .