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Thermal transformations of amorphous aluminosilicate precursors to Ceramics

It is found in our previous studies, that the intermediate phase in the process of transformation of zeolite to ceramic material by thermal treatment is an X-ray amorphous phase. As it has the same composition as the starting zeolite that gave the idea to synthesize only the first step of the zeolite synthesis that means the gel at the room temperature and after certain treatment used it as starting material. Also using the ability of gels to exchange their cation with other cations similar to the zeolites behavior, gave us the possibility to yield different ceramic materials. Further on, the influence of the starting sources of silicate and aluminate solution needed for the precipitation of the gel on the structural particularities of the gel also is reflected to the final product obtained by its thermal treatment. In this study will be presented the physico-chemical and “structural” properties of different amorphous Me-aluminosilicates (Me = Li, Na, K, Rb, Cs) obtained by (a) ion-exchange of Na+ ions from zeolitic Na-aluminosilicate gel with other Me+ ions and (b) direct precipitation from appropriate Me-aluminate and Me-silicate zeolitic solutions. 2. The study of the thermal transformations of the prepared amorphous zeolitic Me-aluminosilicates prepared as described above in order to see how the way of preparation of Me-aluminosilicate and the type of alkaline cation Me+, influence the crystal structure, chemical composition and particulate properties of the products of transformation - ceramics materials.

amorphous aluminosilicates; ceramics; microstructure

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