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Refractory Material-Silica Brick

 
Silica brick belongs to refractory materials, with acid erosion ability, its thermal conductivity, high refractoriness under load, generally less than 1620 DEG C, only the ratio of its low refractoriness 70~80 C. The thermal conductivity of silicon increases with the increase of the working temperature, no residual shrinkage, in the baking process, the silica volume increases with temperature. So, brick is the ideal of the coke oven refractory products, an important part of the large and medium (such as coke oven combustion chamber, ramps and regenerator) with brick masonry.

In the drying process, brick maximum expansion occurs in 100~300 DEG C, 300 expansion before the total amount of expansion is about 70%~75%. The reason is that SiO2 appears in the baking process in 117 C, 163 C and 180~270 degrees and 573 degrees four points between the crystal transformation, 180~270 C, caused by the volume expansion of the largest square quartz.

Key to determine the thermal stability of silica brick quality is true density, true density size is one of the important signs of the transformation of quartz. The true density of silicon is smaller, the lime into more completely and the residual in the oven in the process of expansion is small.

In the brick, the scales of quartz crystal true density, linear expansion rate, thermal stability such as quartz and quartz, slag resistance, good thermal conductivity, high refractoriness under load, the volume is the most stable in the form of quartz. Good brick firing, tridymite content is the highest, accounting for 50%~80% times; cristobalite, accounted for only 10%~30%; and quartz and glass phase content in the range of 5%~15%.