Study of alumosilicate porcelains: Sol-gel preparation, characterization and erosion evaluated by gravimetric method

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Authors

BOGDANOVICIENE Irma JANKEVICIUTE Audrone PINKAS Jiří BEGANSKIENE Aldona KAREIVA Aivaras

Year of publication 2008
Type Article in Periodical
Magazine / Source Materials Research Bulletin
MU Faculty or unit

Faculty of Science

Citation
Field Inorganic chemistry
Keywords Ceramics; Inorganic compounds; Oxides; Sol-gel chemistry
Description In this paper, the sol gel synthesis and characteristic properties of kalsilite type alumosilicates (KAlSiO4 and K0.5Na0.5AlSiO4) are reported. The polycrystalline powders were characterized by thermal analysis (TG/DTA), powder X ray diffraction analysis (XRD) and scanning electron microscopy (SEM). Single phase kalsilite oxides have been obtained after annealing precursor gels for 5 h in the temperature range of 750 to 850 C. It was demonstrated that crystallinity of the samples slightly depends on the temperature of annealing. From the results obtained, it could be concluded that the KAlSiO4 solids are composed of the volumetric plate like grains with no regular size (from 5 to 30 microm at 750 C and around 5 to 50 microm at 850 C). Larger crystallites for mixed potassium sodium kalsilite have formed (from 10 to 80 microm at 750 C and above 100 microm at 850 C) in comparison with potassium kalsilite samples). The erosion of obtained dental porcelain samples stored in saliva, beer and CocaCola was compared.
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