Current, the production of adiabatic brick still is used extrusion and firing craft, form air hole thereby, use in order to achieve the density of a need and thermal conductivity firing craft, can control stomatic bulk strictly, assure its thermal conductivity thereby. Good adiabatic brick used hardwood sawdust, this kind of material is relatively rare, but after treating water, won't arise big in that way like cork expand quantity, because this controls its stoma dimension more easily, of course this will raise cost. A kind of clay and can light material interblend to close, if this is planted,can burning material is to curium not, so it can be in the structure imbibe, next sawdust will happen in water and clay expand, this process can last 1 considerate to a month. Mix this batch of raw material again and pass compress or extrusion. The brick after shaping is enraged into line space dry, be as a result of among them moisture content 25% ? 40% , the time with dry longer need. After dry end, the brick is sent oast, dry below 1000 ℃ . Be in firing link, shape the brick will be loaded kiln car, the brick puts caution in the code of kiln car, need is in of the brick all round the space with enough put apart in order to make sure air current is current, make sure sawdust burns adequately in oxygen at the same time. Heat rate is controlled closely also, avoid to happen temperature changes suddenly or sawdust burns inadequate. Cannot appear on component part not sufficient flaming carbolic trace. Accompanying dry and firing process, the bulk of adiabatic brick will be contractible about 30% . Adobe makes hexahedral brick body through machining, bricky dimension has accurate control here, the brick is in shape actually the form that air hole also can change in the process. We can think these stoma are small bulbiform hole, and be not in fact such. Below most circumstance, manufacturer passes standard brick (the 114mm one side of 76mm) of × of 230mm × 114mm will detect its thermal conductance, if pass 76mm, face, criterion heat conduction rate can rise 20% , because stomatic appearance produced a change,this is. Nowadays, stomatic structure of the brick can shape through epispastic craft. Among them chemical reagents, for example hydroted alumina or hydrogenous oxidation natrium, add in clay raw material, form the bubble that has heat proof quality thereby, because this uses this method, clay makings is pouring in epispastic mould, the mould can be a brick form or bigger board model. After adiabatic brick shapes, take out its dry and firing, next repass machining or cutting want form into all sorts of place. The advantage of this kind of production methods is: Because crop tall; does not seek plasticity target, can produce the adiabatic brick of low density. Defect is: Control stomatic dimension and stoma very hard to distributing. Because density is low, be able to bear or endure flake the gender also is reduced subsequently. If use foaming likely, produce foam through physical method, will get better product so, but stomatic dimension is controlled harder with distributinging meeting. Aluminous content is higher, classification temperature is higher, but basically increase as density, thermal conductivity is reduced, porosity also is reduced. 33 class and brick of 34 class heat insolation are made by synthetic aluminous bleb, contain airtight stoma, its thermal conductivity won't be reduced as temperature, but when raising very high average temperature, its thermal conductivity is climbed once more litre. Dormant air is good insulator, we should make full use of this one character, but fall in certain circumstance, oxygen cannot exist in a few craft, because this is used hydric or carbon monoxide is replaced, both has bigger drop, going up somehow other hydrocarbon, exemple if carbon monoxide can be below 450 ℃ ,decompose through reducing any iron ion to make carbon undertakes, other hydrocarbon is decomposed below 700 ℃ . Hydrogen reduces more, make below about 1080 ℃ silicon is changed into metallic silicon. Hydrogen has younger member likewise, more active in the expression in air hole because of this, change according to temperature, is heat conduction rate of hydrogen airy 5? 7 times. The rate of adiabatic brick heat conduction in hydrogen compares air in 3 times taller, because the furnace atmosphere besides this air is a very main research task. The heat in the adiabatic and fireproof material such as the function of brick of heat insolation of a few kinds of heat preservation and brick of heat insolation of type selecting heat preservation delivers cent to undertake through solid photograph deliver and pass what gas undertakes to deliver two parts. Below microtherm, basically be heat of solid according to legend; Below high temperature, heat of gas according to legend is very important. Conduct to reduce the heat of solid photograph, need chooses the solid look with low thermal conductance, still need to reduce the interface between solid particle to accumulate. For example, crystal structure is more complex, the phonon of scattering is more, thermal conductance is lower. The structural integrality of polycrystal and regular sex are poorer, the influence of impurity of together with crystal boundary and distortion, thermal conductance is lower than monocrystal. Be like again, stomatic can scattering phonon. Usually, porosity increases, can reduce thermal conductance. Still have, use globose small particle, make quantity of heat can be passed only small osculatory area is delivered between particle, the heat that also can lower solid body greatly is conducted. So, the way that increases capacity of heat insolation of brick of heat preservation heat insolation depends on: ① increases porosity; ② reduces stomatic size; ③ increases the complexity of various organization structure; ④ reduces the contact of solid photograph; ⑤ mix into adds shading substance, block up radiate conducts heat. Have 3 kinds of methods that make brick of light qualitative heat preservation: One of, join light qualitative aggregate, with light aggregate of matrix wrap up, union of cement of have the aid of, chemistry is united in wedlock or produce union of pottery and porcelain to make porous material through agglomeration again; Secondly, join combustible, below high temperature combustible burn oneself out hind, in former leave air hole, form porous material; Thirdly, body of production bubble oar, with cement general its solidify, make poriferous through agglomeration material. Adiabatic and fireproof material uses construction technology, use alumina brick of heat insolation of the hollow ball heat preservation that make uses alumina pink of corundum of frit of hollow ball, report, α - stone of line of small pink of Al2O3 small pink, SiO2, silicon and argillaceous pink are had for raw material preparation fight flake function. Raw material composition sees next tables. From go up the watch is knowable, alumina is hollow the ball is light aggregate, assure since high temperature resistant function and the effect that reduce density; Corundum pink is inert filling; Silicon line stone is expander, reduce since firing systole and the function that improve heatproof shake sex; Alumina small pink, oxidation silicon small pink and argillaceous pink are bond, firing temperature is dropped since, form Molaishi to be united in wedlock those who raise brick of heat preservation heat insolation is photograph, high temperature resistant with action of heatproof shake function. The burden plan that presses set undertakes the brick expects making up making, via mixing practice, shape, after natural and dry 24h, mix via 110 ℃ dry 24h again of 1600 ℃ *4h firing make heat preservation is adiabatic brick. Quantity of mix into of silicon line stone is 12% when, the function that controls a brick of heat preservation heat insolation is: *2h of 1710 ℃ , 1600 ℃ burns temperature of bate of 26MPa of intensity of bulk density 1.48g/cm3, compression, loading again the line changes + 0.3% , heatproof shake sex (1100 ℃ - water-cooling) 17. What make brick of heat preservation heat insolation have the characteristic of light qualitative, excel in, high temperature resistant, heatproof shake. 2, use light aggregate and combustible to make brick of heat preservation heat insolation use polystyrene bubble ball, expand collosol of fiber of pearlite pink, Mo Laishi, clay, silicon serves as raw material, the brick of heat insolation of light qualitative heat preservation that goes out through extrusion preparation. Raw material composition sees next tables. By go up the watch is knowable, expand pearlite is light qualitative raw material, rise to reduce bulk density further, improve the function of heat proof quality; Mo Laishi enhances action since fiber, prevent craze of systole of the material in dry, agglomeration; Clay is bond, have the effect that constitutes matrix. Use deserve to compare for: Combine clay 15% ? 30% , Mo Laishi fiber 3% ? 10% , expand pearlite 15% ? 28% , ball of bubble of polystyrene waste material 1.5% ? 3.5% , silicon collosol 15% ? 25% . The process that make is: Stick union on, expand ball of bubble of waste material of pearlite pink, polystyrene mixes even. In the meantime, with beater with certain rotate speed Molaishi fiber is sufficient all ground is dispersive in bond, add water to blend oar body. Next, pink makings and oar body mix agitate, till mixture is dispersed,become all the dope of . After dormant and proper time, extrusion. Normal temperature is dry day or two 70 ℃ dry number after the hour, via finished product getting after agglomeration. 3, use traditional bubble legal system to make brick of heat insolation of calcic feldspathic heat preservation make main raw material with cyanite, made bond develop calcic feldspar to combine Molaishi with white cement light qualitative adiabatic firebrick. The composition of raw material sees next tables. Calcic feldspar combines Mo Laishi heat-insulating material is serve as with Molaishi advocate brilliant photograph, calcic feldspar regards union as the composite material of the photograph. The melting point of calcic feldspar has 1550 ℃ only, but have hot coefficient of expansion small, thermal conductance is low characteristic. Accordingly, calcic feldspar and Molaishi are compound the adiabatic and fireproof material that makes, can have the good point with calcic feldspathic low thermal conductance already, have Mo Laishi goods to use the characteristic with high temperature again, still have inferior firing temperature, higher intensity and better thermal shock stability at the same time. Calcic feldspar combines Mo Laishi heat-insulating material to use bubble law to shape. First, the vesicant that make, synthesize colophony black with colophony and hydrogenous oxidation natrium, add bone glue, make stable foam. Next, add water to make cyanite, white cement noodles or vermicelli made from bean or sweet potato starch makings starch. Then, after joining bubble agitate pouring shape. Next, conserve, drying, firing, make base substrate. Hind, classics cut, essence is ground, after examining, make finished product. Bubble law shapes in the process, foaming agent is main factor. Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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