Chemical Solubility Of Phosphate Glasses In The System Na20-Ca0-Mg0-P205-Al203-Ti02 In Aqueous Solutions Of Different Ph Values

Phosphate glasses of different composition ranges show very different solubility behaviour in aqueous solutions of pH4 and 5.8. With increasing P2O5 concentrations between 38 and 52 mol%, in the system Na2O-CaO-MgO-P2O5, the dissolution rate generally increases, however, the most notable increase is observed at P2O5 concentrations larger than 48 mol%. Additives of TiO2 and slightly acidic medium than glasses near the invert glass range. Glasses in the invert glass range show a stronger increase in the dissolution rates with decreasing pH value and also deceleration of the dissolution with time.