Synthesis powder precursor of LAS ceramics via pH controlled wet chemical process

A powder precursor of β-spodumene based LAS ceramics was synthesized by sol–gel process and precipitation method using Li2CO3, Al2SO4 and sol of SiO2 in dilute solution of H2SO4. The wet chemical pH controlled methods used for synthesis of LAS ceramic's precursor are able to prevent the extremely low acidity of gel. These techniques provide an interesting option for preparation of LAS ceramics because the produced amount of corrosive gases during the thermal treatment (calcination) of precursor is reduced. Thermal analysis methods (simultaneous TG-DTA), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for investigation of precursor composition and properties.

The powder precursor for synthesis of β-spodumene based LAS ceramic was prepared via wet chemical process. The developed method is able to prevent the extremely low acidity of gel without further corrections of pH. It has a positive effect to the precursor purity and it reduces the amount of gaseous products during the thermal treatment of precursor at once.Figure optionsDownload as PowerPoint slideResearch Highlights
► The powder precursor of β-spodumene for production of LAS ceramics was prepared using wet chemical process.
► The applied technique is able to prevent the extremely low acidity of gel.
► Two kinds of product can be prepared according to the conditions of synthesis.
► The precursor properties, composition and processes which take place during thermal treatment are affected by the conditions of synthesis.