輕質高鋁磚的特點Features of lightweight high alumina
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Lightweight firebrick is a major component of firebrick products. The difference between it and heavy firebrick lies in that it does not directly contact the flame and is mostly used in the link requiring thermal insulation in kiln and furnace to play a certain role in thermal insulation.Below, let us understand the mainstream of lightweight refractory bricks in lightweight high-alumina bricks.
Lightweight high alumina brick is also called high alumina insulation brick.Alumina content in more than 48%, mainly composed of mullite and glass phase or corundum light refractory.
The volume density of lightweight high-alumina brick is 0.4 ~ 1.35g/cm3.The porosity was 66% ~ 73%, and the compressive strength was 1 ~ 8MPa.Better thermal shock resistance.The size of the national standard brick is 230*114*65mm.
Physical and chemical indexes of light and high alumina brick:
It can be seen from the index chart that the volume density of our factory's high-alumina lightweight brick is 1.0g/cm3, the room temperature compressive strength is higher than 3.5mpa, the thermal conductivity is below 0.40w /m·k, the composite national standard is high quality refractory products.
High quality light aluminum bricks usually adopt high bauxite clinker and a small amount of clay, the fine grinding method or bubble method using gas before and after the pouring and forming in the form of mud, burn into the 1300 ~ 1500 ℃.Sometimes industrial alumina may be used instead of some bauxite clinker.Used for lining and insulating layer of masonry kiln, as well as parts without strong erosion and scour of high temperature molten materials.Direct contact with the flame, the contact surface temperature is not higher than 1350 ℃.
The distinction of light qualitative firebrick and heavy qualitative firebrick: the main function of light qualitative brick is to use heat preservation, reduce the loss of quantity of heat.Such as: high aluminum lightweight brick, mullite insulation brick;And firebricks are mainly used to withstand the fire of roasting.Conventional lightweight bricks generally do not have direct contact with the flame, while refractory bricks generally have direct contact with the flame.Such as high alumina brick;Corundum mullite brick.
Lightweight high alumina brick
The main differences are as follows:
1. Thermal insulation performance.The coefficient of thermal conductivity of light brick generally in 0.2 0.4 (the average temperature of 350 + 25 ℃) w/m.k, and the coefficient of thermal conductivity of refractory brick (average temperature of 350 + 25 ℃) in 1.0 w/m.k above, which can be concluded that thermal insulation brick insulation heat preservation performance is much better than brick.
2. Fire resistance.The fireproof degree of light qualitative brick is in commonly 1400 degrees the following, and the fireproof degree of heavy qualitative brick is in 1400 degrees above.
3. Density.Light brick is light qualitative heat preservation material commonly, density is in commonly 0.8-1.0g/cm3, and the density of firebrick basically is in 2.0g/cm3 above.
Our company sells high alumina brick, clay brick and so on for a long time, the price is reasonable, the quality is superior, honest and trustworthy, mutual benefit and win-win.Contact number: 0086-13608670776