Effects Of Heating And Aluminium Content On The Dissolution Of Magnesium-Rich Amorphous Silicate Fibres In A Simple Amino Acide Solution

This study suggests that heat treatment around 700 deg C increases the dissolution rate of Mg-rich & Al-free amorphous alkaline earth silicates (AES) fibres, designed to be biosoluble, in a simple amino acid solution. The dissolution experiments of Mg-rich AES fibres in the Al-free & Al-bearing systems heat-treated in the temperature range from 110-1260 deg C were carried out in a glycine solution. These experiments show that the dissolution rate of the Al-free AES fibres in the glycine solution is rising sharply with increasing heat treatment temperature & reaches its maximum around 700 deg C. The sharp rise in the dissolution rate is assumed to be due to the formation of chemically less durable phases caused by phase separation resulting from the heat treatment. These chemically less durable phases may be preferentially attacked by glycine ions.