Firebrick has the fireproof stuff of proper form and dimension.
Will differentiate by preparation technique can divide for firing brick, do not bake bricks, electric frit brick (founding brick) , fireproof and adiabatic brick; Can divide by appearance and dimension for standard type brick, common brick, distinctive model turn etc. Can use as building kiln furnace and material of all sorts of high temperature housing materials that heat up labor facilities and construction, can experience all sorts of physico-chemical change and mechanical effect below high temperature. Firebrick is fireproof degree not the inorganic metalloid material under 1580 ℃ , it is the fundamental material that serves high temperature technology, it is the structural material that build by laying bricks or stones builds kiln furnace to wait for hot project facilities, also be to make container of certain high temperature and component or the functional material that have special effect. Firebrick is used successfully below high temperature action, must have function of good constituent structure, heat, mechanical function and performance characteristics, have namely taller fireproof degree, sex of loading bate temperature, heatproof shake and fight chemistry to erode wait for function, ability bears all sorts of physico-chemical change action, contented heat is versed in the use of equipment and component asks.
For example saggar brick, tall aluminous brick, silica brick, magnesia brick.
Characteristic
1, chemical composition: Bases decides this character of fireproof material and characteristic
2, bulk density: Unit volume weight, density is big, explain compact sex is good, intensity is likely tall, but coefficient of thermal conductivity may be big firebrick.
3, apparent pore rate: Did not make particular demand, but must control apparent pore strictly as manufacturing manufacturer.
4, loading bate temperature: Also call high temperature loading to begin to be out of shape temperature, this parameter is very important, the counteractive ability with mark high temperature resistant material
5, heatproof shake function: Fight the ability that temperature changes quickly and is not destroyed
6, compressive strength: Bear (normal temperature) of capacity of the greatest pressure
7, fight lose strength: Bear the ability that cuts pressure
8, linear change ratio: Also make weigh the change that burn a line or call leftover line change, point to happen in the bulk in coequal temperature change every time expand to change contractively, like if expand every time,contracting, we define such linear change to lead the that it is 0
9, wearability: Everybody knows I did not say more, it is one of index of first-rate of fireproof material character
10, thermal conductance: Below condition of unit temperature gradient, carry rate of the thermal current on data unit area, concern with porosity
11, impact resistance: Need not explain, impact resistance is good, service life grows
12, the sex that fight broken bits: In the ability that broken bits of dissolve of high temperature little resistance erodes action and is not destroyed
of brief introduction of commonly used and fireproof material
1, tall aluminous brick: Al2O3 content is more than 75 above, fireproof brick of degree of prep above clay, it is good to fight soda acid aggressivity, appropriate cement kiln is firing the place such as the belt, life of use firebrick is long but price tall
2, dolomite brick: Performance of the skin that hang kiln is good, it is good to fight aggressivity, but more or less is there F-CaO in having a brick, yi Shui is changed, be hard to carry and keep, produce useful less
3, magnesian chromic brick: The skin that hang kiln is good, multi-purpose at firing belt, defect is difference of heatproof shake function, add 6 price Cr has virulent, be produced on international and use the national drop off of magnesian chromic brick, the manufacturing unit that uses this brick now finds substitute as early as possible
4, pointed spar brick: Multi-purpose at excessive belt, aseismatic performance is good, it is good to fight reproducibility, but fireproof degree a little of within an inch of
5, fight flake brick: Contain in this brick a few ZrO, in warm up Martens photograph happens to be out of shape in the process fine crackle, have fight more by force alkalescent, fight flake the gender is mixed the sex that fight broken bits is better
6, phosphatic brick: Fireproof degree low, but sex of shake of intensity high fever is good, multi-purpose wait for use at cover of head of Bi cold machine, kiln
7, carborundum brick: High temperature resistant (1800 degrees or so, loading bate temperature is in 1620-1640) , hot coefficient of expansion is small, be able to bear or endure urgent cold urgent hot wearability is very appropriate cooling zone and kiln mouth
8, silicon not brick: Thermal shock sex is good, intensity is high, wearability is good, appropriate and excessive belt.
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