Glass Ceramic Properties Pdf

Glass ceramic materials were first developed at the corning glass works and share properties of both the parent glass material and polycrystalline materials.

Glass ceramic properties pdf. Mechanical properties glass transition effects on all materials. Ceramics are often semi crysta lline. As they contain crystalline phases and therefore also grain boundaries glass ceramics can range from transparent to opaque 1 2. When used for sealing some glass ceramics do not require brazing but can withstand brazing temperatures up to 700 c.

Glass ceramics have the fabrication advantage of glass as well as special properties of ceramics. In this article we look at how they differ from glass materials how they are produced some typical compositions and their applications. The glass transition temperature is relevant to any solid that contains non crystalline material. Glass ceramics consisting of various oxide crystals in a matrix of siliceous residual glass offer properties not available with more common silicate crystals.

Metals are difficult to keep from crystallizing but if quenched fast enough they can exhibit non crystalline phases. In particular glass ceramics based on spinels and perovskites can be quite refractory and can yield useful optical mechanical and electrical properties. Varshneya is the editor of processing properties and applications of glass and optical materials published by wiley.