Refractory Fire Bricks - Kiln Bricks - Characteristics (2024)

FAQs

What is the quality of refractory bricks? ›

Application-specific performance: Refractory bricks are designed for specific high-temperature applications and environments, offering better performance in terms of wear, corrosion because of direct contact with the corrosive media, and thermal resistance.

Basic Refractory Bricks

Basic refractory bricks are the ones which mostly consist of basic oxides such as magnesia (MgO) and dolomite (a combination of calcium magnesium carbonate, CaMg(CO3)2). Such materials have a very high melting point and have excellent resistance to alkaline substances.

A refractory brick can absorb 5 to 10% of water. Refractory bricks are resistant to high temperatures, have a high fusion point, and have exceptional compressive strength. Each cubic foot of fire bricks weighs 150 lbs.

Bricks should be uniform in color, size and shape. Standard size of brick should be maintained. They should be sound and compact. They should be free from cracks and other flaws such as air bubbles, stone nodules etc.

The main properties of ceramic refractories include the capacity to withstand high temperatures without melting or decomposing and the capacity to remain unreactive and inert when exposed to severe environments.

A fire brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is designed mainly to withstand high heat, but should also usually have a low thermal conductivity to save energy.

Because firebrick, also known as refractory brick or heat-resistant brick, is made of materials like alumina and silica, it can retain its integrity even after exposure to extreme temperatures. Common brick has some moderate heat-resistance, but cannot withstand high temperatures without deterioration.

These bricks are made from a special type of ceramic which can withstand high temperatures without damage. A typical brick could start to break apart at 1200 degrees Fahrenheit (~ 649 degrees Celsius), but a refractory brick will handle heat up to 1800 degrees Fahrenheit (~982 degrees Celsius).

The ideal lining thickness for a rotary kiln has always been a matter of controversy. As a matter of fact, there are very large kilns lined with 200mm brick and small kilns lined with 220mm brick.

Acidic refractory's key feature is its ability to withstand acid slag erosion at high temperatures, but it is more prone to react with alkaline slag. Alumina, silica zirconia refractories, and fire clay bricks refractory are alkaline refractories.

What is a refractory fire brick? ›

A fire brick, firebrick, fireclay brick, or refractory brick is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency.

Depending on the composition of the material, most refractory materials have a shelf life ranging from six to twelve months.

The main firing defects of refractory bricks are under-burning, over-fired, damaged, spots, cracked, etc.

Refractory metals are a broad category of metallic materials that display excellent durability to thermal and mechanical stress. Their shared properties include resistance to corrosion and wear, high melting points, retention of mechanical strength at high temperatures, and high hardness at room temperature.

Refractory materials, by definition, are supposed to be resistant to heat and are exposed to different degrees of mechanical stress and strain, thermal stress and strain, corrosion/erosion from solids, liquids and gases, gas diffusion, and mechanical abrasion at various temperatures.