Refractory Brick

A refractory brick is a block of material used in the lining of the industrial furnaces, kilns, and fireplaces. “Fire brick” is the most commonly used term for refractory brick. It is a very dense ceramic material which can withstand excessive amounts of heat and corrosion. As can be guessed by the name, they are usually in the shape of a brick, but other types and shapes can be manufactured too. Fireclay is the main material of refractory bricks, and vitrifying the fireclay is the most commonly used manufacturing method. Aluminum oxide is another important material in the manufacturing process and can be as high as %80.

Refractory Brick Composition

Refractory bricks usually come in two standard sizes, which are 229x114x76 mm and 229x114x64 mm. However, as mentioned above, it is possible to manufacture different sizes and shapes. Refractory bricks are used in lots of different industries and their compositions change according to this. For example, refractory bricks made with silica (silica fire bricks) are used in the steel-making furnaces and can withstand temperatures as high as 3000 F. Although they are used in low-temperature conditions too, for example, refractory bricks made with magnesium oxide are used in ordinary furnaces as a lining.

The İmportance of Fire Bricks

Silicon carbide refractory bricks are used for incinerators and it is possible to see the common red fire bricks in chimneys and ovens. In other words, refractory brick is a commonly used material and its composition can change according to the needs. But one thing is common (and mandatory) for all types of refractory bricks: they should not spall and hold their strength against rapid temperature changes. In other words, they need to have a low thermal conductivity and provide energy efficiency. Refractory bricks are an important part of the refractory industry and they are being used for hundreds of years.