The Mechanism Research of Foam Glass under Surface Depression

The under surface depression of foam glass blanks as one of the typical defects, influences and impedes the quality of foam glass and material cutting rate. This paper studies the water content of release agent and open flame burning temperature effects on under depression of foam glass, to reveal its generation mechanism, using TG-DSC, XRD, FTIR, and other analytical methods. The results show that, with the increase of drying temperature, the under surface depression phenomenon reduces, indicating the air cavity caused by heating vaporization of water molecules. The surface is white. In the early flame heating, firing temperature is more than 700°C, by the mold bottom heating carbon, resulting in carbon black early reaction gas, not be wrapped by glass, eventually gathering to form an air chamber. The surface is grey.