Fireproof but plastic from nominally knowable it is one kind can bear the material of high temperature action, and the certain plasticity that still has. Plasticity basically is to show outer strength effect falls can aleatoric appearance, after outside force is contacted, can hold the property with changeless appearance. So fireproof but plastic form with what material after all, its character how?
Fireproof but plastic have stronger but plastic, use tamp law construction normally, classics is puissant pound hit and structure of pottery and porcelain is formed after high temperature is roast, in intensity of structure of lukewarm high temperature tall, wearability is strong, heatproof shake sex is admirable. Fireproof but plastic basis use material differs character, commonly used is siliceous aluminium pledges fireproof but plastic, if clay is qualitative fireproof but plastic, tall aluminium is qualitative fireproof but plastic pledge with corundum fireproof but plastic. Use performance characteristics of different bond means and utility to differ.
Fireproof but plastic composition and fireproof and pouring the way of makings is same, be it is material by the fireproof aggregate of different grain and powdery makings, join what the material such as bond, plasticizer, preservative, shrinkproof agent is configured and become, according to using combinative means different and main component is 3 kinds: Argillaceous bond but plastic, phosphoric acid is united in wedlock but plastic be united in wedlock with phosphoric acid aluminium but plastic.
But plastic function basically includes chemical part, fireproof degree, creep of loading softening point, high temperature, thermal stability, add a hot line density of limit of contractive, use temperature, mechanical intensity, porosity, bulk, plasticity, condense the gender, storage period that pack. Below makes one introduction with respect to a few main function of plasticity:
(1) is fought lose strength
But plastic in 800~1000 ℃ fight fold intensity Leng Kang to lose strength tall. It is after this temperature, fight fold intensity value to drop very fast. Alumina content is high, porosity is inferior can fight plasticly lose strength big. Will tell to fireproof material, cannot forecast hot condition strength according to cold conditions intensity commonly. But plastic in lukewarm intensity forecasts hot condition strength. But plastic in lukewarm intensity is higher, this is the furnace of hot project kiln such as furnace of heating furnace, soaking use but plastic one of main factors that can prolong service life.
(2) loading softening point
The loading softening point that does not burn material often compares the argillaceous brick that pledges with material or on the low side of tall aluminous brick. This is one of its major drawback.
(Bulk of 3) high temperature
This index but plastic better than concrete. The factor that affects it is dosage of pug moisture, clay, adscititious expander wait. Japanese regulation, below highest use temperature, the systole after heating or bulgy line change ratio should not exceed ±2% .
Can decide accordingly but plastic scope of application. Exceed this to use temperature, ratio of material line change exceeds 2% , it is unallowed.
(4) thermal stability
But a plastic advantage is thermal stability good. Because,this is: The first, its grain upper limit is big, for example 6~8mm or bigger. The 2nd, rise along with temperature, the white of vitreous get along with that joins argillaceous generation expects medium free Al2O3 reaction generates Molaishi. Undertake in reaction in, liquid glass photograph is less and less, this makes its heat expands rate is low, in temperature when acuteness change, generation stress is lesser. The 3rd, firebrick and concrete are typical brittleness material. And but plastic be heat along with furnace and by agglomeration. The degree that its heat up face and union of pottery and porcelain of sectional other part makes different. Stretcher than fire brick and concrete performance is good, the capability of amortize thermal stress is consequently strong, produce thermal shock not easily to flake.
(5) fights broken bits sex
The sex fighting broken bits of plasticity is undesirable, unwell be in the place of corrode having broken bits at using.
(Creep of 6) high temperature
But plastic variable is very big. The bulk stability below high temperature loading still is waited for improve.
(one) clay is united in wedlock but plastic be give priority to by grog of argillaceous grog, tall aluminous vitriol want material, plasticity clay mixes complex compound for bond, become pug via adding water to mix practice, the adobe of certain plasticity is had in classics pressurization or home cliff city. The main characteristic of this material is the heatproof shake sex with be had better is mixed heatproof flake quality. Basically use at the roof of steel rolling heating furnace and boiler setting.
(2) phosphoric acid is united in wedlock but plastic be with argillaceous grog or tall aluminous alumina clinker, corundum is main material, phosphoric acid or aluminium of acidity phosphoric acid are bond, mix the compound that plasticity saggar, preservative and additive material configuration become. The characteristic of this material: In intensity of high temperature bond is high, wearability and heatproof shake sex are strong wait for an advantage.
When producing phosphoric acid to combine plasticity material semifinished product, should adopt 2 paces to mix experienced technology, the first pace is used first those who be equivalent to phosphoric acid solution always needing a capacity 60% expect with fireproof aggregate, pink and plasticity clay is rising mix practice to mix even and junior travel to strand makings 24h, in order to make fireproof collect expects solution of can sufficient adsorptive phosphoric acid, the metallic iron that in making fireproof collect expects, contains (by what defeat the belt when smashing to enter) as can sufficient as phosphoric acid root reaction gives off H2 to enrage. Undertake the 2nd pace mix practice next, when mixing practice, join preservative and the rest of solution of about 40% phosphoric acid, mix when all achieving place to require plasticity index, squelch again or extruding becomes base, use plastic film base substrate sealed deposit.
It is solution of 1.25g/(m3 phosphoric acid with density, the phosphoric acid that makes up with clay grog and tall aluminous grog is united in wedlock but plastic be with phosphoric acid aluminium solution makes bond, make aggregate with corundum, with AA2O3 fine pink and small pink make pink expect but wear-resisting of preparation high temperature but plastic.
Phosphoric acid aluminium or phosphoric acid union but plastic industrial kiln waits in metallurgy, petrifaction, electric power and machinist job there is extensive use on furnace, basically use at making heat-resisting quake, be able to bear or endure erode, wear-resisting line system, if make the burner of heating furnace, a makings of cement rotary kiln mouth, set upright the liner such as segregator of tornado of mouth of kiln feed in raw material, high temperature.
(3) vitriolic aluminous union but plastic be with argillaceous grog or tall aluminium aluminous grog, corundum is aluminous solution of main material phosphoric acid to be bond, mix the compound that plasticity saggar, preservative and additive material configuration become. The characteristic of this material: In intensity of high temperature bond is high, wearability and heatproof shake sex are strong wait for an advantage. Manufacturing cost is low, use use is extensive.
Vitriolic aluminium is solid state material, when using, dissolve it first than abdicate in water, it is density achieves 1.15-1.2g/cm3. Vitriolic aluminium is united in wedlock but plastic construction means is: Mix practice for the first time - tired makings - the 2nd batch mixing - use. Mixing practice for the first time is the 60%-70% that joins place to need vitriolic aluminous solution, the purpose depends on making collect makings and solution embellish wet, the iron in making fireproof collect expects and vitriolic aluminous reaction generate H2 to go out side by side, after making base substrate in order to prevent, happen expand. Solution of vitriolic aluminium of the rest 30%-40% is added when mixing practice the 2nd times, retell pug extruding becomes preform, with polyethylene film sealed pack, cent evaporates and lose plasticity in order to avoid water.
Vitriolic aluminous union but plastic and main use at structural intensity tall industrial furnace liner. If can do hearth of annular heating furnace prefab piece, forging liner of furnace lining, perpendicular kiln.
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