Of the crucial job content of tall aluminous qualitative firebrick head it is the tectonic compressive strength below tall , this one characteristic is spent with of load molten deformation commonly come appraisal. Some closer year also measure its tall stress is flabby the gender will reflect its compressive strength of tall construction. The experiment concludes, load molten is spent along with Al2O3. Of water content promote and promote.
One of main job property of tall aluminous firebrick are the structural intensity below high temperature, this one character is out of shape with loading bate temperature comes normally assess. Also determine sex of creep of its high temperature will reflect strength of structure of its high temperature. Test result makes clear, loading bate temperature rises along with the addition of Al2O3 content. Al2O3 content is in 70% the following tall aluminous firebrick, loading bate temperature depends on the quantitative scale of photograph of Mo Laishi brilliant and fluid alternate with, the measure that follows Molaishi increases and rise. The amount of fluid photograph and property have apparent effect to loading bate temperature. Accordingly, reduce the matter content in raw material, be helpful for improving loading bate temperature and denaturation of high temperature squirm.
Al203 water content is in 70% following firebrick, load molten spends the gross that depends on photograph of Mo Laishi brilliant and concentrated juice alternate with to occupy than, the number that follows Molaishi promotes and promote. The gross of concentrated juice photograph and character are spent to load molten have remarkable harm. Consequently, in reducing raw material residual water content, be beneficial to improve load molten to spend reach tall stress flabby sex.
It is 70% ～ in the light of Al203 water content the Mo Laishi —— of 90% is fireproof department firebrick, al203 water content increases, the promotion that load molten spends is not apparent. It is the one part molten that crystallizes because of the Molaishi below tall , reach its and establish to come the gross with the residual solution of effect of stone crystallization generation has promotion a bit, it is Ti02 very. Fe203 component promotes along with water content of the Al203 in raw material and have promotion a bit, change the number that made appearance of tall concentrated juice and character.
Because sandwich glass takes a fancy to Ti02. A lot of promotion of Fe203 component, make the number of sandwich glass photograph increases, viscosity is reduced. This that is to say endangers load molten to spend significantly reach tall stress the crux of the problem with flabby sex not big promotion. Can join when firebrick only basically complete by fireproof form, namely firebrick Al203 water content is amounted to 95% when the left and right sides, tectonic compressive strength just has tall to promote significantly.
The brick of clay of price of heat-resisting shake sex of tall aluminous firebrick is poor, in this and firebrick mineral form be closely bound up. The tall aluminous firebrick such as I, Ⅱ compares the tall aluminous firebrick such as Ⅲ (some poorer. The grain content characteristic that producing basis of the regular meeting in making to improve firebrick or add in condiment must of gross generate Jin blueness (2Mg0.2AI203.5Si0z) other mineral the heat-resisting shake sex that will improve firebrick:
The character fighting broken bits of tall aluminous firebrick rises along with the promotion of Al203 water content. But it is alkaline to slanting ability of slaggy the job that fight corrode is less than slant alkaline fireproof insulation material. Of residual water content decrease, be beneficial to promotion to fight broken bits sex. Together, promote the opposite density of firebrick: Reduce hole rate, it is the reasonable countermeasure that promotes its to fight broken bits sex.
Tall aluminous firebrick weighs tall aluminous brick again, its production and stick person brick to manufacture technology similar, differentia is mix into matching pink tall aluminous grog is more, fireproof brick of degree of prep above clay, it is better to fight soda acid to invade candle function, comfortable at all sorts of kiln furnace firing the place such as the belt is used.
Al2O3 content is more than a general designation of siliceous aluminous qualitative firebrick of 48% to be tall aluminous firebrick. Press Al2O3 content more or less to differentiate for 3 grade: I (Al2O3>75%);II (Al2O3 is 60%~75%); Ⅲ to wait (Al2O3 is 48%~60%) . Can divide according to mineral composition for: Low Molaishi is qualitative (include silicon line stone pledge) reach Molaishi to pledge (Al2O3 is 48%~71.8%) , mo Laishi - corundum reachs corundum character - Molaishi is qualitative (Al2O3 is 71.8%~95%) , corundum is qualitative (Al2O3 is the firebrick such as 95%~100%) .
As the addition of content of the Al2O3 in tall aluminous firebrick, mo Laishi and the amount that firm kindly help secure the success of something divides also increase, vitreous photograph decreases accordingly, the fireproof sex of tall aluminous firebrick and density also rise subsequently. Be less than when content of the Al2O3 in tall aluminous brick 71.8% when, the high temperature in tall aluminous firebrick stabilizes brilliant photograph is Molaishi, and be added along with Al2O3 content and grow in quantity. Be in to Al2O3 content the tall aluminous firebrick of 71.8% above, high temperature stabilizes brilliant photograph is Molaishi and corundum, increase along with 71.8% content, corundum estimates increase, mo Laishi decreases, corresponding land improves the high temperature capability of tall aluminous firebrick.
Of tall aluminous firebrick firing temperature depends on the agglomeration sex of aluminous raw material. With fancy reach grog of I class alumina (when bulk density ≥2.80g/cm3) , the constituent structure of raw material is even, matter content on the high side, make base substrate easy agglomeration, but firing temperature range is narrower, easy had caused burn or undersintering. Use grog of II class alumina (when bulk density ≥2.55g/cm3) , because not come to what petrifaction causes 2 times,expand and inattentive effect, make base substrate not easy agglomeration, reason is firing temperature slightly tall. Use grog of III class alumina (when bulk density ≥2.45g/cm3) , the organization is compact, al2O3 content is low, firing temperature is inferior, general of brick of clay of grog of summary prep above firing the 30~50 ℃ of temperature. Tall aluminous firebrick is firing in oxidizing flame.
Because temperature of bate of loading of tall aluminous firebrick is a main character. Experimental result shows it follows content of the Al2O3 in tall aluminous firebrick change and change: When Al2O3 content is comprised theoretically under Molaishi, the balance in tall aluminous firebrick is Molaishi - vitreous photograph. Mo Laishi content follows Al2O3 to increase and increase of content, loading bate temperature also rises accordingly.
Tall aluminous firebrick fights thermal shock sex to be differred than argillaceous brick, 3~5 of loop of 850 ℃ water-cooling second. Because the heat of corundum is expansile,basically be relatively Molaishi is tall, and the reason that amorphism changes. And Ⅰ , the tall aluminous firebrick such as sexual comparing Ⅲ needs the shock of heat-resisting of tall aluminous brick such as Ⅱ some.
On production, adopt wither to work the way that pug grain forms normally, in order to improve the grain structure character of tall aluminous firebrick, improve sex of its heat-resisting shake thereby. In recent years Zuo , a certain quantity of synthesis cordierite is joined to make the tall aluminium firebrick of sex of tall heat-resisting shake in the burden of tall aluminous firebrick, obtain apparent effect.
The sex fighting broken bits of tall aluminous firebrick also is contained along with Al2O3 relatively increase and rise. Reduce matter content, be helpful for rising fight aggressivity.
The distinction of tall aluminous firebrick and argillaceous brick depends on tall aluminous firebrick having good performance characteristics, because this compares argillaceous brick to have longer service life, become one of firebrick with at present wider application of building materials industry.
Brick of special type tall aluminium is firebrick of new-style chemical union tall aluminium, the weakness with inferior intensity of compression of the difference of thermal shock function that it overcame tall aluminous firebrick, normal temperature, had phosphatic firebrick be able to bear or endure chemistry is eroded reach all sorts of good points with high intensity, and hang kiln skin easily, it is firing the belt is new-style with firebrick. Law of recipe of the fireproof sludge that tall aluminous brick uses, attune and argillaceous brick are basic and identical, yi Ke uses excel in fireproof mud.
Tall aluminous firebrick has taller diathermancy than clay brick, photograph of this sandwich glass in be the same as tall aluminous firebrick is reduced reach Molaishi to crystallize or the promotion of fireproof crystallization is relevant.
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