Is Glass A Ceramic Material

Apart from making household materials glass and ceramics have found their place in many areas.

Is glass a ceramic material.

A ceramic material is an inorganic non metallic often crystalline oxide nitride or carbide material. Ceramics and glass have many applications that require qualities such as hardness rigidity high resistance to heat corrosion etc. Glass and ceramics are widely used for making household utensils. 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.

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. 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. Fluoroapatite containing glass ceramic is the preferred material to fuse to lithium disilicate glass ceramics and to high toughness sintered zro 2 ceramics. They withstand chemical erosion that occurs in other materials subjected to acidic or caustic environments.

Glass can be called as a type of ceramic. Glass ceramic material was first formulated at the famous corning company in new york in 1953. When corning and the iconic french company saint gobain joined forces in 1990 to form eurokera they brought together the top manufacturer of cooking materials with a company that has been leading the world in glass making for over 350 years. Needle like nanometre sized fluoroapatite crystals are precipitated in the glassy matrix in this glass ceramic.

The sem micrograph in fig. 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. We use a vast range of ceramic materials in the day to day life. 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.

Nextrema tinted 712 3 sheet. The crystals themselves are generally very small less than 1µm and most often very uniform in size. Nextrema transparent 724 3 sheet. 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.