It is well known, that silicon brick belongs to acid refractory, and has a good resistance to acid erosion. Silicon brick sales, reliable quality, reasonable price, its thermal conductivity is good, high softening temperature under load, fire resistance can reach more than 1620℃.
Its thermal conductivity will increase with the increase of working temperature, without residual shrinkage. In addition, the volume of silica brick will increase with the increase of temperature in oven. So, the silicon brick sales is coke oven use on the ideal refractory products, at present, the important parts of large and medium-sized coke oven (such as combustion chamber, ramp and regenerator) they are built with silicon bricks.
Generally speaking, the true density is the key to the thermal stability of silicon brick. The smaller its true density is, the more complete its lime transformation is, and the smaller the residual expansion in the oven.
In the industrial oven process, the maximum expansion of the its occurs between 100-300℃. The expansion before 300℃ is about 70%~75% of the total expansion. The reason is that four crystal transformation points (117℃, 163℃, 180~270℃ and 573℃) appear in SiO2 in the oven process, among which the volume expansion caused by quartz is the largest between 180 ℃ and 270℃.
The silica content of this series refractory brick is more than 94%, and the true density is 2.35g/cm3. In addition, natural silica is mainly used as raw material, and an appropriate amount of mineralization agent is added to promote the conversion of quartz in the body into scale quartz. Slow firing at 1350 ~ 1430℃ in reducing atmosphere. When heated to 1450℃, there is about 1.5~2.2% of the total volume expansion of the silica brick sales. This residual expansion will make the cutting joints close and ensure the masonry has a good air tightness and structural strength.
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