The refractoriness of refractory bricks

What is the fire resistance of refractory bricks? This is a question that users often mention when purchasing refractory bricks or inquiring about refractory brick prices. What is the fire resistance of refractory bricks? In the definition of refractory bricks, refractory bricks are a type of brick that can withstand combustion and high temperatures, with a refractoriness of around 1700 ℃. The refractoriness of refractory bricks is determined to be around 1700 ℃? Actually, it's not like that.

What is the fire resistance of refractory bricks? Fire resistance is the temperature at which refractory bricks resist high temperatures without melting under no load, and is used to indicate the performance of refractory bricks in resisting high temperatures. The chemical composition, mineral composition, phase separation distribution, and bonding condition of refractory raw materials used in the production of refractory bricks have a decisive impact on their refractoriness. The basic factors determining the refractoriness of materials are the chemical mineral composition and distribution of refractory raw materials. Impurities, especially those with melting agent effects, can seriously reduce the refractoriness of refractory raw materials and affect the refractoriness of refractory bricks.

Once we understand the fire resistance of refractory bricks, we need to learn more about their fire resistance. We know that refractory bricks are made of different materials depending on the refractory raw materials used, such as silica bricks, clay bricks, high alumina bricks, mullite bricks, corundum bricks, carbon bricks, magnesia bricks, etc. Therefore, the fire resistance of refractory bricks is not only 1700 ℃, but also varies among different materials of refractory bricks.

The refractoriness of common refractory bricks: silica bricks: 1690-1730 ℃; Clay bricks: 1580-1750 ℃; High alumina brick: 1750 ℃; Molestone bricks: 1850 ℃; Corundum brick: 1790-1850 ℃; Magnesia brick: 2200 ℃; Carbon brick: 2000 ℃, etc.

The determination of the fire resistance of refractory bricks shall be carried out in accordance with the Chinese standard GB/T7322-2007 (equivalent to the international standard ISO528-1983). The key point of GB/T7322-2007 is to make the test material into a screenshot triangular cone, with each side of the upper base being 2mm, each side of the lower base being 8mm, a height of 30mm, and a cross-section forming an equilateral triangle; The bending condition of the test material cone and the standard temperature measuring cone until the top of the test cone bends and contacts the chassis. At this time, the temperature represented by the standard temperature measuring cone that bends at the same time as the test cone is the fire resistance of the refractory brick of the test cone. Different methods of testing fire resistance are similar but use different tools. For example, in foreign countries, the tool used to test the fire resistance of refractory bricks is the Seck cone, abbreviated as SK.

The refractoriness of refractory bricks is purchased by customers as refractory bricks, but it is only a reference indicator. It is necessary to understand the specific temperature at which refractory bricks are used, which is the basis for determining whether refractory bricks are suitable.