Characterization of Ultrafine Glassy Powder for Al-Si-Ca-P-O-F Polynary System by Sol-Gel Method

Abstract:

The ultrafine bio-glass powder of Si-Al-Ca-P-F^- polynary system was prepared by sol-gel method with organic and inorganic compounds such as Si (OC₂H₅)₄, (C₂H₅)₃PO₄, Ca (NO₃)₂·4H₂O, Al (NO₃)₃·9H₂O and NH₄F. The powder was heat-treated at the different temperature in the range from 200 to 900°C and its crystallized transition was ascertained. The morphology, composition, structure state and crystallized behavior of the glassy powder were characterized by means of TEM, XRD, EDS, DSC-TG, FT-IR etc methods and compared with the glassy powder of the same system by melting-quenching and liquid precipitation. The results show that the powder containing elements Si, Al, Ca, P, F and O belongs to typical amorphous state, and is composed of the near spherical particles with the size from 100 to 400nm; The transition temperature of glass was about 580°C, and the crystallized phase CaF₂ precipitate firstly above 600°C; A series of crystallized phases Ca₅(PO₄)₃F and Ca₅(PO₄)₂SiO₄ were separated sequentially with increasing temperature; The network structure of glass is similar to that of melt-quenching or liquid precipitation glass.

• Periodical: Advanced Materials Research (Volume 412)
• Pages: 138-141
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.412.138
• Online since: November 2011
• Authors: G.C. Yuan, Z.H. Zhu, X.M. Ni, Z.Y. Ling
• Keywords: Al-Si-Ca-P-O-F Glass, Sol-Gel (SG), Ultra-Fine Powder

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