Hollow ball brick is the heat preservation brick that makes with the fireproof and hollow ball of diametical 3-5 millimeter, material qualitative content is high, good in effect of the heat preservation below very high temperature, the price is exceedingly high also.
Apparent pore of hollow ball brick is small, thermal conductance is small, heat-resisting shake sex is good, intensity of high temperature structure is high, but immediate step is built within furnace of high temperature kiln, can produce pipe of high temperature heat. Cover of tray, protection. Alumina is hollow ball brick, zirconia ball brick is a kind of commonly used hollow ball brick.
1. alumina is hollow ball brick. 2 zirconia are the caustic of a kind of high temperature resistant, anti-corrosive, wear-resisting, capable person do not have carbon that has high quality electrical conductivity, the main use of zirconia of this one phase has expanded tectonic raw material and new-style function material, alumina is hollow sphere is a kind of adiabatic and refractory products. The typical technology index of hollow ball brick has alumina: Al2O3 not under 98% , siO2 is more than 0.5% , fe2O3 content is more than 0.2% . In the meantime, still can lead 60%-80% , compressive strength according to bulk density 1.3~1.4g/cm3, apparent pore not under the 9.8MPa, loading in 0.2MPa (below 0.2MPa) , hot conductivity is 0.7~0.8W/(m.K) .
Alumina is hollow ball brick is with alumina hollow ball is main raw material, it is auxiliary with high-powered small pink, make with organic material temporarily binder, at 1750 ℃ high temperature firing. The product contains a large number of shutting stomatic, have quality light, high temperature resistant, heat proof quality is good, heavy burn it is good to receive small, heat-resisting to pound function wait for a characteristic, to eroding at the same time gas is mixed slaggy also have stronger be able to bear or endure corrode sex. The product can improve the thermal efficiency of kiln furnace greatly, shorten production is periodic, reduce kiln body weight, implementation is energy-saving fall bad news.
Recipe of hollow ball goods designs alumina one of main features that high fever block is adiabatic heat insulating materials. Alumina is hollow and globose pouring makings is main rely on close the stoma inside air hole and goods matrix in order to obtain taller thermal resistance. When product porosity is changeless, the stoma of product interior is more dispersive, bore diameter is smaller, resistance of heat exchange of the convection inside air hole is greater; In the meantime, according to scattering principle, phonon heat conduction and obstruction of photon heat conduction increase, radiation conducts heat reduce.
Use critical size lesser (the hollow sphere of 3mm) , in order to reduce groovy and stomatic size. In introducing DX matrix, introduce organic qualitative, introduce small hole. Additional, adopt recipe design, make the photograph composition of the product is had " foreign matter effect " , increase the thermal resistance of the product further thereby.
Because the intensity of hollow sphere itself is lesser, crackle expands hollow sphere can be crossed to continue easily after hollow sphere outspread. To achieve this one goal, the grain of critical granuality corundum of 3mm is added in burden, in order to raise the tenacity of the product; In the meantime, use in former a generation is optimal below content CA6 condition expand the micro-crack with effect certain generation, raise the tenacity of the product thereby.
In intensity respect, carry proper burden, use cement. The chemical reaction of small pink and agglomeration, in order to achieve the intensity of the requirement. Light-duty or pledge gently partly pouring expecting basically is the light simple stuff that distributings equably in burden (won't have slant analyse) wait for an element without larger air hole with goods interior. The affiliation of DX improved a system stream change learn character, prevent pink to expect the bottom sinks and hollow ball is changed.
2. zirconia is hollow ball brick brick is by zirconia hollow sphere (65%~70%) and zirconia are fine pink (30%~35%) serves as raw material, use boric acid solution to undertake mixture, use next fill forming machine of the vibration that press type to shape, make after body drying at 1700~1800 ℃ firing. Hollow sphere wants the commonly used zirconia in raw material to serve as raw material with zirconia, the oxidation that use hydrogen is calcic (or yttria. Magnesian) as thickener, the course mixes equably, report is isolated wait for craft to make place make the juice that get frit. Zirconia fine pink should make raw material with zirconia, oxyhydrogen dissolves calcium (or yttria. Magnesian) as thickener, make its mix equably, electric frit pipe fitting becomes frit liquid, smash after cold doubt. Mill. Zirconia is hollow ball craft is complete by zirconia hollow ball is made, have peace of admirable high temperature compressive strength to give stomatic structure firmly, use at cling to the heat preservation heat-insulating material of the position such as the furnace lid in equipment of machine of family name sterilization, like reaction furnace of electric stove of intermediate frequency box type, carbon black, give air hole flowing structure.
Zirconia is hollow sphere is the heat insulation with good performance and handicraft of material of heat preservation fire prevention, the biggest safe moving temperature is 2200 ℃ , in metallurgical industry. Petro-chemical equipment. The industry such as electronic equipment serves as in insulation equipment of production can instantly raw material of the line in the high temperature of flame of bring into contact with, it is good to use practical effect.
Zirconia is hollow sphere and zirconia fiber product are the heat preservation of advanced course in showing level stuff, environmental protection energy-saving lining material. Box type electric stove can have wall system not only the action of insulation material, and still can use as lining raw material. Product and close of acidity and fireproof material, acid-proof sex, neuter slag all has better be able to bear or endure corrode sex. This product is used in the stability below oxidisability atmosphere.
The zirconia below each temperature all is crystal of monocline brilliant, all directions and cubic brilliant. Monocline crystal is stable inside 1170~2370 ℃ limits, cubic crystal is stable between 2370~2680 ℃ , cubic crystal stability is inside melting point limits.
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