INFLUENCE OF DIFFERENT CaF₂ CONTENTS AND HEAT TREATMENT TEMPERATURES ON APATITE-MULLITE GLASS CERAMICS DERIVED FROM WASTE MATERIALS

, where x is 5, 10, 15 and 20 (wt. %). The result concluded that the Ca and Si elements were found in the CS and SLS glass respectively as a major weight composition, thereby promoting the use of waste materials in the manufacture of glass ceramic samples. Besides, the CaF 2 addition lowers the glass transition temperature (T g ) and crystallisation temperature (T c ) of the glass composition. The density and percentage of the linear shrinkage of the samples differs with the addition of CaF 2 and various heat treatment temperatures. For the structural properties' analysis, the formation of fluorapatite with a needle-like microstructure and mullite phase was enhanced with a higher CaF 2 content, while the growth of the anorthite phase was observed to occur at a higher heat treatment temperature. Generally, the addition of ahigh CaF 2 content with the help of heat treatment in apatitemullite glass ceramics composition greatly promotes the crystallisation of the fluorapatite phase, which is crucial for denture glass ceramics.