Is Glass A Ceramic Material

Glass ceramic material was first formulated at the famous corning company in new york in 1953.

Is glass a ceramic material.

Glass can be called as a type of ceramic. The key difference between glass and ceramic is that ceramics have crystalline or semi crystalline or non crystalline atomic structure whereas the atomic structure of glass is non crystalline. A ceramic material is an inorganic non metallic often crystalline oxide nitride or carbide material. Some elements such as carbon or silicon may be considered ceramics ceramic materials are brittle hard strong in compression and weak in shearing and tension.

Apart from making household materials glass and ceramics have found their place in many areas. Materials that are initially fabricated as glasses and perhaps shaped using glass moulding techniques and converted to a ceramic to enhance their properties are called glass ceramics. Glass ceramic is a material that combines two types of materials to form a product that is in a class of its own between glasses and polycrystalline ceramics. The sem micrograph in fig.

The dominant crystalline phase of the las glass ceramics hq s s has a strong negative coefficient of thermal expansion cte keatite solid solution as still a negative cte but much higher than hq s s. Glass and ceramics are widely used for making household utensils. The crystals themselves are generally very small less than 1µm and most often very uniform in size. They withstand chemical erosion that occurs in other materials subjected to acidic or caustic environments.

Needle like nanometre sized fluoroapatite crystals are precipitated in the glassy matrix in this glass ceramic. Fluoroapatite containing glass ceramic is the preferred material to fuse to lithium disilicate glass ceramics and to high toughness sintered zro 2 ceramics. Glass ceramic materials have the same chemical compositions as glasses but differ from them in that they are typically 95 98 crystalline by volume with only a small percentage vitreous. Glass ceramic from the las system is a mechanically strong material and can sustain repeated and quick temperature changes up to 800 1000 c.

A well known example of a glass ceramic is the ceramic cooker hob which has been developed to have a thermal expansion coefficient close to zero. Nextrema transparent 724 3 sheet. We use a vast range of ceramic materials in the day to day life. Glass is known to be a non crystalline material.