The study on the phosphate glass melted by microwave irradiation

In this study, NH4H2PO4, Li2CO3, and Ca(OH)2 raw materials were mixed with and without adding water or pressing pressure. The three types of mixture (i.e., raw mixtures, waterish mixtures, and dense mixtures) were then subjected to microwave irradiation. The samples were characterized by various methods of analysis method. With adding water, the particles changed from irregularity into aggregation. Simultaneously, the existence of H3PO4 and increase in hydroxyl group of waterish mixtures is due to the decomposition of NH4H2PO4, which could promote microwave absorption. In addition, dense mixtures could change into glass after microwave irradiation with increasing pressing pressure. The connection between mixtures with and without adding water or pressing pressure and degree of microwave absorption, and how they are influenced on glass formation is discussed.