Firebrick - Features
1, the chemical components: a main component to determine the quality and characteristics of the refractory
2, the bulk density: weight per unit volume, density, good compactness, the strength may be high, but the thermal conductivity may
3, apparent porosity: I did not do specific requirements, but as the manufacturer must be strictly controlled apparent porosity? The World blocks V shows fresh and male both recognize stool the word Di Chi peaks, vector carboxylase the missing N Luan read?
4, RUL: also known as the beginning of the high-temperature load deformation temperature, this parameter is very important, high-temperature resistance of the marking materials
5, thermal shock resistance: the resistance to temperature changes dramatically without the capacity to destroy
Compressive strength: withstand (at room temperature) the maximum pressure capability
7, flexural strength: the ability to withstand shear pressure
8, the linear rate of change: also called reheating linear change or called residual-line changes, each time the same temperature change in volume expansion and contraction of the change, if each expansion and contraction, we define the linear rate of change 0
9, wear resistance: we all know I do not say that it is one of the best indicators of the quality of refractories
10 Thermal conductivity: Unit temperature gradient conditions, the rate of heat flow through the material per unit area associated with porosity
11, Impact resistance: do not have to explain it, good impact resistance and long service life
12, slag resistance: high temperature resistance to slag erosion without the capacity to destroy
Introduction to commonly used refractories
1, high alumina bricks: Al2O3 content is greater than 75, refractoriness higher than that of clay brick, good resistance to acids, alkalis, suitable for cement kiln burning zone, etc., long life, but the price is high
2, dolomite brick: hanging kiln Paper performance, good corrosion resistance, but a brick in the number of f-CaO, the Yi River, difficult to transport and storage, production with less
3, magnesia-chrome brick: hanging skin kiln used for firing zone, the disadvantage is the poor thermal shock resistance, coupled with a highly toxic hexavalent Cr international production and use of magnesia-chrome brick country gradually reduced, now with this the bricks production units as soon as possible to find alternatives
4 spinel brick: used for over-with good seismic performance, reducing resistance, but almost a little refractoriness
5, anti-spalling bricks: This brick contains a small amount of ZrO, the Markov phase transition occurs in the heating process the formation of fine cracks, with strong alkali resistance, good spalling resistance and slag resistance
6, phosphate bricks: low refractoriness, but good strength high thermal shock resistance, and more for the grate cooler, kiln hood
, Silicon carbide brick: high temperature (1800 degrees, RUL 1620-1640), the coefficient of thermal expansion, resistance to thermal shock, abrasion resistance good the appropriate cooling zone and kilns
8, silicon Mo brick: good thermal shock resistance, high strength, good wear resistance, suitable for over-with.
