Zirconium corundum brick is the firebrick that with industrial alumina and zirconium Ying Sha makes for raw material. Press workmanship, corundum brick can divide zirconium to be mixed for brick of corundum of electric frit zirconium firing zirconium corundum brick two kinds.
1, higher intensity and wearability;
2, erode and permeate what fight acid slag: Of all kinds corundum advocate brilliant photograph is A-Al2O3, erode and permeate ability what fight acid slag it is weller to have. The broken bits of the generation in puddling process is acid slag commonly, siO2 content is higher and CaO content is inferior. Puddling industry uses Al2O3 generally base fireproof material serves as liner, the Al2O3-SiC-C of channel of if blast furnace is noumenal tall aluminous brick, taphole is qualitative fireproof material (pouring expect and pound dozen of makings) , mud of prepare Chinese medicine by roasting it in a panbig gun (Al2O3-SiO2-SiC-C is qualitative) , ladle and torpedo canister pledge with Al2O3-SiC-C fireproof material (pouring makings and firebrick) etc.
3, material pledges and the diversity of function: Corundum advocate brilliant photograph is A-Al2O3, can mix with a lot of oxide blame oxide is compound, improved a few performance of oneself, if fight thermal shock sex, fight broken bits (acidity or alkalescent) aggressivity. As compound as SiO2 form corundum Mo Laishi simple fireproof stuff, as compound as MgO form corundum - pointed spar pledges character fireproof material, as arenaceous as zirconium flower (ZrO2 and SiO2) compound form Al2O3-SiO2-ZrO2 simple fireproof stuff, as compound as carborundum and carbon form Al2O3-SiC-C to pledge fireproof material is waited a moment;
4, the diversity that ties kind, corundum is as better as all sorts of bond consistence, can use a variety of union means, for instance union of high temperature agglomeration, low temperature is waited a moment, can gift the character with different material.
Common of brick of corundum of electric frit zirconium calls galvanized iron the brick, also call corundum - inclined zircon brick. 70 ％ of ～ of ％ of Al2O3 50 of main and chemical composition, 40 ％ of ～ of ZrO2 20 ％ , the others is SiO2. Main and mineral composition is inclined zircon (ZrO2) , corundum (α-Al2O3) and vitreous photograph. Inclined zircon crystallization forms bricky body backbone, zrO2 melting point is high (2715 ℃ ) chemical stability is good, to acidity, alkalescent medium especially of vitreous fluid fight erode ability stronger.
Corundum brick uses electric frit zirconium to wait for industrial kiln furnace in vitreous frit kiln in, the use place in vitreous frit kiln is build by laying bricks or stones builds superstratum pool wall, port to average the point such as Xuan of Xuan, port battlements, tongue and parapet. In use should notice brick of corundum of electric frit zirconium the following problem:
① heats up bulgy irregular change. Of brick of corundum of electric frit zirconium expand the curve has a paragraph around 1000 ℃ unusual, crystal of its interior Zr02 produces the crystal change of reversibility, have bigger bulk change, accordingly, contain the brick of ZrO2, unfavorable the position that is used in 1000 ℃ to control temperature to often have quick wave motion. When roast kiln furnace, in 900 ～ change of the temperature when 1150 ℃ cannot pass big, cannot exceed 15 ℃ commonly / H, the requirement warms up smoothly. Certain place should prevent blow a cold wind over, need to be protected with other brick, in case scamper is cracked.
② shrinkage cavity. Pouring when shaping, casting mouth office often appears shrinkage cavity, stoma of here brick body is more, send density to differ, fuse in glass of build by laying bricks or stones so when Chi Bi, all the direction inside kiln of shrinkage cavity face. Outside day of the opening that be like casting, erode when bricky body very thin when, can cause vitreous fluid leakage to run accident. When space of blaze of pool kiln upside is used, service life is very long, also won't happen run vitreous fluid problem, so, will use outside casting opening day again, prolong service life.
③ in all frit. Brick of corundum of electric frit zirconium and build by laying bricks or stones of argillaceous brick contact are built, can happen below 1300 ℃ high temperature in all frit phenomenon, accordingly, when choosing fireproof material, should avoid will in all build by laying bricks or stones of contact of two frit phenomenon is serious kinds of fireproof material is built, if silica brick is below brick of corundum of electric frit zirconium, get the most easily of brick of corundum of electric frit zirconium erode.
The brick of corundum of electric frit zirconium that 1. makes below reducing atmosphere fights aggressivity poorer
Contact of fluid of glass of high temperature of get along with of glass of brick of corundum of electric frit zirconium can build tall viscosity layer, this is zirconium corundum brick fights the key with corrode good performance. Temperature of bate of photograph of this requirement glass wants tall, the brick is so medium besides Al2O3, ZrO2, SiO2, Na2O, other part wants little. But because use brick of black lead line and black lead electrode,be in when electric stove is fused, can produce reducing atmosphere consequently, the one part of C and the Fe2O3 that CO can make fuse-element medium, TiO2, SiO2 by reductive become low oxide, this makes part group yuan increase. The basic principle that the basis leads is knowable, this meeting makes fluid photograph is restricted thermal drop is small. Such brick is used below high temperature when, the viscosity of vitreous photograph is reduced greatly, the covering layer of tall viscosity cannot be formed, vitreous photograph viscosity is low, diffuse extremely easily to fluid of high temperature glass, because of this brick medium brilliant photograph lost bond to also can fall into vitreous fluid, this makes stripe and stone arise in vitreous fluid.
And the brick of corundum of electric frit zirconium that oxidation law produces need not brick of black lead line, although electrode still uses black lead, but use law of long electric arc to fuse, make C is in electric arc in medium oxygen is united in wedlock and produce CO2 with air and entering melt system. The bricky carbon content that this kind of method produces under 0.005% , fight corrode sex to increase greatly consequently.
The zirconium corundum brick that makes with reductive law at the same time still can be in glass generation bleb. Because oxide of the low in vitreous photograph of the brick and other material have strong reproducibility like C,this is, dissolve should capture when they and vitreous fluid are contacted the oxygen in vitreous fluid. This makes but dissolve changes class status at the gas in glass, become not easy dissolve to become bleb at the gas of vitreous fluid. Be like dissolve the SO3 in vitreous fluid by reductive into SO2. SO2 is in the solubility in vitreous fluid is low, become bleb consequently. This makes vitreous fluid quality drops.
2. heats up bulgy irregular change
The characteristic of brick of corundum of electric frit zirconium is the organization is stable and compact, be able to bear or endure vitreous fluid aggressivity is very strong. There is abnormality to expand between 900~1200 ℃ phenomenon, because form of ZrO2 monocline brilliant change is ZrO2 square brilliant,this is model cause, it can be mixed for the kiln of vitreous pool kiln that bake the reference when moving.
Because other part is affected in AZS brick, temperature of brilliant form transition is fluctuant inside ±50 ℃ . When be being used accordingly, heat and in cooling process in 950 ～ 1150 ℃ temperature changes cannot too big, do not exceed 15 ℃ commonly / H.
Of zircon unusual expand and systole can serve as amortize by vitreous photograph, do not send generation crackle. 70 time later period begins 20 centuries to introduce 0.15% ～ in composition the B2O3 of 0.20% , the vitreous photograph that such making that contain in AZS brick body not only heatproof concussion sex is better, and to unusual expand have amortize effect. But temperature changes big or wave motion relapses inside temperature limits here, also can produce chap. Be in so warm up when the kiln that bake, in 950 ～ warm up inside 1150 ℃ limits should smooth. The place that often changes in temperature (wait like mouth of feed in raw material) when using, want to be protected with other brick outside.
Brick of agglomeration zirconium corundum also calls pottery and porcelain to combine brick of aluminous silicon zirconium. Photograph of brick of corundum of zirconium of the frit that be the same as report is compared, the chemical composition of brick of agglomeration zirconium corundum is similar, . But have do not contain content of appearance of carbon, glass inferior, structure is even, without shrinkage cavity, thermal shock stability and fight the good point with good aggressivity.
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