Fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, insulating materials, and Monolithic refractory are examples of common materials used by the leading refractory manufacturers. Different types of refractories are used in applications like boilers, furnaces, kilns, and ovens, depending on the temperatures and service conditions.
Here are the types of performances of the
common refractory materials:
1. Fireclay Refractory
Hydrated aluminum silicates with 25%–45%
Al2O3 and 50%–80% SiO2 and trace amounts of other minerals make up the majority
of fireclay refractories. Fireclay brick is one of the popular refractory
materials. It is used significantly in most furnaces, stoves, regenerators,
kilns, etc., since it is very inexpensive, and its raw materials are generally
available.
2. Silica Brick
A common refractory material called silica
brick contains at least 93% SiO2. Silica brick possesses exceptional mechanical
strength at temperatures close to its real fusing point. The behavior of
several other refractories, like the alumino-silicate materials, which start to
creep at temperatures and fuse comparatively lower than their fusion points,
contradicts this behavior.
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3. Magnesia Bricks
Materials containing at least 85% magnesium
oxide are magnesite refractories or magnesia bricks. These are created from the
naturally occurring materials silica (SiO2) and magnesite (MgCO3). The physical
characteristics of this class of bricks are often inferior, and their main
strength lies in their resistance to basic slags, especially those that are
iron and lime rich. The quality depends on the magnesia bricks supply.
4. High-alumina Refractory Materials
High alumina materials are typically used
to describe alumina refractories that contain more than 45% alumina. The range
of alumina content is 45 to 95%. Three types of refractories are frequently
used: corundum (99%), mullite, and sillimanite (61%). With an increase in
alumina content, high alumina refractories become more refractory.
5. Monolithic Refractory
All unshaped refractory products are
collectively referred to as monolithic refractory. In many applications,
particularly those of industrial furnaces, monolithic refractories are commonly
used.
6. Insulating Substances
High porosity refractories with poor
thermal conductivity are utilized as insulating materials by the leading refractory manufacturers like
RHI to reduce heat losses. Unlike firebricks, insulating
materials are less dense and have a higher thermal resistance.
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