In the process of glass molding, the surface of the crystal is disintegrated to produce a crystal layer. Because the thermal expansion coefficient of crystal is much lower than that of glass phase, it even reaches negative expansion.In the subsequent annealing process, the crystal layer at the bottom and edge of the sample shrinks less, the crystal layer produces compressive stress, and the glass produces tensile stress.
Due to the high viscosity of zero-expansion glass-ceramics, a molding device is used to ensure the appearance quality of the molding. The role of the molding cover and heating element is to provide heat to the glass liquid in the molding, so that it maintains a certain fluidity and can be spread over the mold.
In the process of forming and cooling after forming, the bottom of the glass is in the range of crystallization temperature for a long time, resulting in crystallization.
The glass block is made of natural ores such as quartz sand and limestone, and fused with some chemical raw materials such as soda ash and borax.
Glassstone is a kind of building material and glassy gem made of glass and stone mixed and rolled, the surface looks solid, in fact, it can be transparent during the day, and at night, it will emit a soft light.
Use: Glass stone because of its colorful colors, often used as decorative materials for clothing and perfume bottles, necklaces, etc. In addition, it is also used by artists to create and make glass and stone crafts.