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August 12, 2017 18:05

firebrick

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refractory brick is used for display of objects, the most exposed to high temperatures or open flames (eg chimneys, fireplaces).Widely used in the industrial sector in the creation of furnaces for melting metals.Building material can tolerate temperatures up to 1800 degrees, has good resistance to external mechanical influences.

Content

  1. Species firebricks
    1. Fireclay (alumina)
    2. Carbon
    3. Quartz
    4. main
  2. Specifications refractory bricks
  3. Advantages and disadvantages
  4. Video

Species firebricks

Classification specialized bricks made according to the materials from which they are made, and their scope.Used in the composition of the raw materials directly affects the quality of produced: open fire resistance, high temperature.There are kinds of refractory bricks:

Fireclay (alumina)

Made from special fireclay clay rocks (about 70%).It is the most affordable and popular materials for laying of interior walls of fireplaces and stoves.Not destroyed when exposed to alkalis, easy to tolerate temperature jumps.Depending on the application temperature is classified into grades: MF (1250 ° C), PB (1350 ° C), SB (1350 ° C), BC (1250 ° C), Shak (1400 ° C), SA (1400 ° C)and SHUS (1250 ° C).

Carbon

has dark gray or black color.About 92% consists of pressed graphite or coke.It is used in the construction of blast furnaces in factories and industrial steel plants.

Quartz

produced from large quartz grains.Has "torn" edges on scrapped.It differs from other types of instability to the effects of alkali metal oxides.It does not affect the state of the building material in direct contact with fire or metal.The main purpose - the internal layout of fireplaces or stoves.

main

name comes from the chemical term "base".It consists of a lime-magnesia mass.It is used when creating the furnaces for the production of steel by the Bessemer process.The resulting metal different from conventional steel with increased elasticity, but due to the presence of phosphorus in the structure more fragile.The main brick is easy to tolerate exposure to phosphorus compounds.

Specifications refractory bricks

main properties of different types of bricks depend on the materials from which they were made.Universal and Budgetary considered fireclay type.Determine the size of the fireclay refractory brick according to the labeling.For example, a straight brick SHA-5 has dimensions of 230x114x65 mm and the front wedge for display of angular and arched designs has such parameters: 230x114x65 / 55 mm.Approximate weight refractory bricks is from 2.5 to 6 kg.But regardless of the features of shape or size, fireclay brick has the following specifications:

  • density - 1700-1900 kg / m³;
  • refractoriness - from 1300 ° to 1800 ° C;
  • strength - 12-23 N / mm²;
  • thermal conductivity - 0.62 W / (m · ° C);
  • porosity - 8%;
  • Brand frost - F15-50;
  • brand strength - M75-250;
  • water absorption - 25%.

These features are characteristic of high quality refractory bricks.Their open porosity is less than 30%, to achieve a long service life.Some options may vary when minor errors in the procurement of a mixture or in violation of the features of production of refractory materials (according to GOST 8691-73 or GOST 390-96).

Advantages and disadvantages

reviews Most customers allocates Fireclay refractory brick due to a good combination of price and quality.But to create the optimum working conditions of factory furnaces are advantageous and the main type of carbon.They have a higher price, but they differ increased service life in harsh environments.

In the photo on the specifics of the masonry of refractory bricks can appreciate the complexity of the work: the presence of the slightest irregularities unacceptable.Non-uniform layer of the solution can lead to the destruction of a constricted portion under the influence of heat weld.The very mixture must comply with building regulations.Proper installation of refractory bricks preserves the integrity of the industrial design for years to come.Carefully carry out the construction of the fireplace or household oven is no less important.This will help users of professional video collections to the instructions for storage and subsequent use of various kinds of refractory bricks.

Video

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