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    Description Fireclay bricks are the most widely used refractories made from clay minerals. It can be ...

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Fire Clay Brick Refractories

Date:2016-02-17 09:30 | From:Zhengzhou Sunrise Refractory | Author:admin
Fire clay bricks comprise about 75% of the production of refractories on a volume basis and are essentially hydrated aluminum silicates with minor proportions of other minerals. Typical composition consists of SiO2 <78% and Al2O3 < 44%. As a type they are extremely versatile; least costly of all refractory bricks and are extensively used in the iron and steel industry, non-ferrous metallurgy, glass industry, pottery kilns, cement industry and by many others.
 
All fire clay brick are not alike and the total ranges of their properties are quite broad. ASTM subdivides fire clay brick into four major classifications depending primarily upon fusion temperature (Pyrometric Cone Equivalent, PCE) which, within limits, is a function of the alumina-silica ratio. The four standard classes of fireclay brick are: super duty, high-duty, medium-duty, low-duty, and also semi-silica. These classes cover the range from approximately 18% to 44% alumina, and from about 50% to 80% silica. From the standpoint of fusion temperature, super duty fire clay brick have a PCE of approximately Cone 33, which corresponds to 3175°F. This does not mean that a brick with a PCE of Cone 33 can be used in furnaces operating at 3175°F. On the contrary, it means that at this temperature in a clean, slag free, neutral to slightly oxidizing atmosphere, this brick would be unable to support its own weight. 
 
Characteristically, fire clay brick begin to soften far below their fusion temperature and under load actual deformation takes place. The amount of deformation depends upon the load, and, once started, this deformation is a slow but continuous process unless either the load or the temperature is reduced. It is for this reason that fire clay brick are not well adapted for use in wide sprung arches in furnaces operating continuously at high temperatures.

fire clay bricks
 
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