To meet customer's needs we developed some new silica bricks used for coke oven.
"XUANKUN" has the ability and strength to customized silica bricks according to customer's requirements, Warmly welcomed old and new customers to cooperate with us!
Silica brick is one of the most commonly used refractories. Due to its low cost, high creep resistance and low pollution to glass, it is widely used in the crown of the glass furnaces. Silica brick is a kind of basic refractory and has good corrosion resistance to acid slags.
It is mainly made from natural silica sand whose SiO2 content should be more than 96%. The higher SiO2 content in silica sand, the higher temperature silica bricks resist. Its crystal structure consists of tridymite, cristobalite and a small amount of residual quartz as well as glass phase.
The refractoriness of silica brick is not quite high, about 1600-1730℃, but its melting temperature under load is very high, about 1620-1670℃, which is similar to its refractoriness and the melting temperature of tridymite. It is durable with no deformation under high temperature.
At 1450℃, there is 1.5-2.2% overall expansion which makes the joint-cutting dovetailed, thus silica bricks have good air tightness and strong structure.
Silica brick has good thermal shock resistance above 650℃, so it is mainly used in the continuous operating furnace. However, under 650℃, it has poor thermal shock resistance, so the temperature should be increased slowly during the baking process.
Silica brick has good corrosion resistance to glass liquid. It is the preferred refractory for crown construction of glass melting furnaces, in terms of cost, strength and of defect potential.
