CN101113097A - Infrared radiation porous ceramics on furnace lining firebrick and preparation method thereof - Google Patents
Infrared radiation porous ceramics on furnace lining firebrick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an infrared radiation porous ceramic used on the surface of lining firebrick and preparation method thereof. Slurry of the porous ceramic is made of aggregate and binder. The aggregate is made of the following compositions: light floating bead with 20-45 percent, Suzhou earth with 20-40 percent, aluminum oxide micro bead 5-15 with percent, magnesium oxide with 5-12 percent, high emissivity material with 5-15 percent, and coal powder with 1-5 percent. The preparation steps are as follows: 1. separate ball milling of Suzhou earth, magnesium oxide, high emissivity material to prepare for making the light floating bead and prepare for the aggregate processing; 2. the made slurry is sprayed to base, then the base is heated, sintered and cured in furnace. The invention can be sintered under a low temperature of 950-1200 DEG C and has high intensity, small density, low heat conductivity, high normal total emissivity of total infrared band 2.5-20 Mum. The invention can be made under no special equipment, is simple and practical, and can be broadly popularized.
Description
Technical field
The present invention relates to a kind of infrared radiation porous ceramics material and preparation method, especially a kind of can be at the lesser temps sintering, the low density, the low-thermal conductivity that are used for various heat, dry furnace lining firebrick, full infrared band has the infrared radiation porous ceramics and the preparation method of high emissivity.
Background technology
Infrared radiant material has higher emissivity, and heat transfer rate is fast, and characteristics such as heating quality height are developed rapidly in recent years, have been used for the infrared radiant material on various high temperature furnace linings and the heating unit, has obtained unusual effect energy-conservation and the protection furnace lining; As patents such as Chinese patent publication number CN1114329A, CN1131691A and grant number CN2195745Y.But ubiquitous outstanding problem is, the one, than great, be unfavorable for energy-conservation; The 2nd, could use under certain condition, range of application is restricted.Because according to Kirchhoff's theorem, thermal absorptivity equals thermal emissivity.Thereby thermal emissivity is when improving, and thermal absorptivity has also improved, and promotes the heat radiation and the accumulation of heat of furnace wall inevitably; If its accompanying furnace lining matrix thermal conductivity is big, then can consume energy more on the contrary.
The CN2064770 patent announcement a kind of infrared radiation porous ceramics plate, its porous plate is made up of two-layer different refractory materialss, upper strata resistance to heat little (ir radiation layer), lower floor's resistance to heat big (low thermal conductivity thermofin), can improve the combustionproperty of coal gas significantly, save a large amount of coal gas.Weak point is to use temperature low, annotate on special-purpose porous mold and water moulding, complex process, cost height.
Publication number be CN1556781A patent announcement day inventor's a kind of porous ceramics and manufacture method thereof, help nanotechnolgy, biotechnology, medical skill; The organic blowing agent that adopts in the invention needs heating until decomposition, the size that means such as inflation pressurization are come control punch, and complex process not only, and be easy to form the channel-style pore of perforation, cause the intensity of material to decrease; Thermal conductivity increases.Therefore, with the porous ceramics that this method is made, uncomfortable cooperation heat-insulation and heat-preservation material.
As the heat-insulation and heat-preservation material, require porous ceramics to have low heat-conduction coefficient, good heat-insulation and heat-preservation, thermostability and chemical stability, high temperature resistant, and certain intensity will be arranged; For this reason, the external chromic oxide that adopt more, zirconium white etc., but these materials have the cost of material height, manufacturing process complexity, shortcomings such as firing temperature height.Its firing temperature is general 〉=1200 ℃, this is 950-1200 ℃ a middle High Temperature Furnaces Heating Apparatus to most furnace temperature, can't utilize the furnace temperature of stove own to carry out sintering, thus be not suitable for large-scale heating, the drying oven furnace lining is used.
Summary of the invention
Purpose of the present invention will overcome above-mentioned deficiency exactly, provide a kind of and can and certain intensity be arranged at 950-1200 ℃ of lesser temps sintering, the normal direction total emissivity height of low density, low-thermal conductivity, the full infrared band of 2.5-20 μ m, do not need specific equipment just can make the infrared radiation porous ceramics and the preparation method that can on the middle heat under the various atmosphere, dry furnace lining firebrick, use.
Purpose of the present invention is achieved by the following scheme:
Infrared radiation porous ceramics on a kind of furnace lining firebrick, by aggregate and adhesive preparation form slurry, aggregate contains following component in percentage by weight in essence: lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-15%, magnesium oxide is 5-12%, high emissivity material 5-15%, coal dust 1-5%.
The high emissivity material is made up of the material of following weight percent: ferric oxide 42-48%, Manganse Dioxide 20-30%, behind cobalt sesquioxide 8-14%, cupric oxide 8-13%, the cerium dioxide 7-12% mixing, sintering 0.8-2h makes under 1260-1300 ℃ of condition.
The particle of aluminium sesquioxide microballon is the 100-180 order.
Described binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 80-90%, silicone resin 10-20%;
Weight percent between described binding agent and the aggregate is 33-42%:58-67%.
The preparation method of described porous ceramics may further comprise the steps successively:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 130-200 ℃ of temperature condition, dry respectively; Fine ground respectively then, the 280-320 order that sieves is preserved stand-by respectively;
2), the molecule lightweight of preparation closed pores is floated pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: the pore-forming material lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-15%, magnesium oxide 5-12%, high emissivity material 5-15%, coal dust 1-5% by weight proportion, and mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand;
5), slurry configuration: the weight percent by binding agent and aggregate is that 33-42%:58-67% is configured, and stirs until evenly stand-by;
6), spray: adopt the wide aperture spray gun of spray coarse sand, the slurry that stirs is injected on the furnace lining firebrick;
7), dry in the shade;
8), sintering: solidify with baker heat-agglomerating.
During spray, the used pressurized air Ying Jing of the spray gun processing of deoiling, air pressure maintains 2-4 kilogram/m
2, gun slot be 15-20cm by spray thing surface distance, spray thickness 〉=2mm.
Preferably, aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 27-43%, Suzhou soil 25-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 7-10%, high emissivity material 7-13%, coal dust 2-4%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 80-85%, silicone resin 15-20%;
Binding agent and aggregate weight ratio are 33-36%:64-67%.
Preferably, aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 30-40%, Suzhou soil 30-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 8-11%, high emissivity material 7-10%, coal dust 2-3%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 86-90%, silicone resin 10-14%;
Binding agent and aggregate weight ratio are 37-42%:58-63%.
Preferably, aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 27-35%, Suzhou soil 32-38%, aluminium sesquioxide microballon 11-14%, magnesium oxide 6-7%, high emissivity material 10-14%, coal dust 4-5%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 83-87%, silicone resin 13-17%;
Binding agent and aggregate weight ratio are 35-39%:61-65%.
Preferably, also contain the sintering agent smaller or equal to aggregate gross weight 5% in the aggregate, sintering agent is frit or natural feldspar.
The main component effect of porous ceramics of the present invention:
The pore-forming material lightweight is floated pearl: floating pearl is the main composition of aggregate, and it is guaranteed that goods contain higher closed porosity, and its proportion and thermal conductivity are reduced greatly as being present in the slurry for the independent closed pores of moulding in advance.
Suzhou soil: raw material is easy to get, and is cheap, can reduce production costs, main bonding and the enhancement of rising.
Magnesium oxide: can improve heat-resisting and heat impact strength.
Coal dust: as whipping agent, when hanging down intermediate sintering temperature, form some opening micropores, be particle expanded by heating reserving space, ftracture in the goods sintering process so that prevent.
Alchlor microballon: the ratio of adjusting the closed porosity size.
High emissivity material: mix in the aggregate and form by transition element and oxide compound, and the high emissivity material that adopts suitable reaction sintering to make, played the impurity effect, regulated the concentration ratio of these two kinds of defectives of material electronics and ion, made the whole infrared band of porous ceramics all obtain higher emittance.
In the binding agent: the effect of silicone resin is that when spray, it can increase the cohesive force of slurry and backup lining brick, during low intermediate sintering temperature, and its organic acid or volatilization, or decomposition and inversion is inorganics, can strengthen the intensity of base substrate; Behind the high temperature sintering, silicochromium aluminium complex sol can make porous ceramics and furnace lining form mortise, and it plays an important role to the intensity that improves porous ceramic articles, and also there is certain influence in the aperture.
Characteristics of the present invention:
1, the present invention has produced with lower cost and has had high strength, and use temperature can reach 1200 ℃, and volume density is 0.84-1.02g/cm
3, 100 ℃, 900 ℃ thermal conductivity is respectively 0.029,0.310w/mk, normal direction total emissivity 〉=0.91 of the full infrared band of 2.5-20 μ m, and have the good ir radiation porous thermal insulating material of higher closed pore structure.
2, adopted the lightweight molecule of closed porosity to float pearl and made pore-forming material, coal dust is made whipping agent, has formed the micropore of even aperture distribution behind the sintering, does not need in advance whipping agent to be carried out thermal degradation the inflation pressurization; Not only control easily, and stable, safety, reliable.
3, need heat-agglomerating in Special Equipment, can utilize stove self heating to burn till.
4, high temperature resistant, the chemical stability of the present invention and resistance to thermal shocks is good, nontoxic pollution-free, it is the infrared radiation porous ceramics of a kind of comprehensive porous ceramics and infrared coating premium properties, it can be used for heating, soaking, the dry furnace lining firebrick of various atmosphere, to strengthen the radiative transfer under the stove high temperature, improve the heat-insulating property of holding of stove, reduce the heat lost by radiation of stove outside surface, extending furnace lining life, save energy.
5, the invention raw material is easy to get, technology is simple, cost is low, and heat field in can being widely used in has boundless market outlook, therefore is beneficial to and applies.
Description of drawings
Fig. 1 is the gas cell distribution and the microtexture shape appearance figure of the porous ceramics observed under polarizing microscope;
Fig. 2 is the spectral emittance graphic representation through SEM-1 infra-red material emittance device measuring;
Fig. 3 is the wave band radiant-energy spectrum gamma flux density graphic representation through SEM-1 infra-red material emittance device measuring;
Fig. 4 is the refractory brick that adheres to porous ceramics of the present invention, under 1200 ℃, oxidizing atmosphere, behind the heating 240min, takes out and is cooled to room temperature, repeatedly the schematic surface after 6 times.
Fig. 5 is the refractory brick that adheres to porous ceramics of the present invention, at 1200 ℃ of the highest furnace temperature, H
2+ N
2The heat treatment furnace of atmosphere continues the schematic surface after heating reaches 190h.
Embodiment
Describe the preferred embodiment of the present invention below in detail.
Embodiment one:
Infrared radiation porous ceramics on a kind of furnace lining firebrick, by aggregate and adhesive preparation form slurry, aggregate contains following component in percentage by weight in essence: lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-15%, magnesium oxide is 5-12%, high emissivity material 5-15%, coal dust 1-5%.
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 42-48%, Manganse Dioxide 20-30%, behind cobalt sesquioxide 8-14%, cupric oxide 8-13%, the cerium dioxide 7-12% mixing, sintering 0.8-2h makes under 1260-1300 ℃ of condition.
The particle of described aluminium sesquioxide microballon is the 100-180 order.
Described binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 80-90%, silicone resin 10-20%;
Weight percent between described binding agent and the aggregate is 33-42%:58-67%.
Above-mentioned each component is made porous ceramics of the present invention by the following method:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 130-200 ℃ of temperature condition, dry respectively; Fine ground respectively then, the 280-320 order that sieves is preserved stand-by respectively;
2), the molecule lightweight of preparation closed pores is floated pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: the pore-forming material lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-15%, magnesium oxide 5-12%, high emissivity material 5-15%, coal dust 1-5% by weight proportion, and mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand;
5), spray: adopt the wide aperture spray gun of spray coarse sand, the aggregate that stirs is injected on the furnace lining firebrick;
6), dry in the shade;
7), sintering: solidify with baker heat-agglomerating.
During spray, the used pressurized air Ying Jing of the spray gun processing of deoiling, air pressure maintains 2-4 kilogram/m
2, gun slot be 15-20cm by spray thing surface distance, spray thickness 〉=2mm.
The volume density that experiment showed, the porous ceramic film material for preparing with the described method of present embodiment is 0.84-1.02g/cm
3, having higher closed pore structure, the microtexture pattern of observing under the polarizing microscope that Germany comes card company to produce is as shown in Figure 1.
The thermal conductivity result such as the table 1 that adopt flat band method to measure.
Table 1
| Temperature ℃ | 100 | 300 | 600 | 900 |
| Thermal conductivity (w/mk) | 0.029-0.048 | 0.138-0.177 | 0.266-0.306 | 0.310-0.321 |
As can be seen from Table 1, the present invention has good low-thermal conductivity.
Normal direction total emissivity 〉=0.91 of the full infrared band of the described porous ceramics 2.5-20 of present embodiment μ m surpasses the requirement (ε of GB GB4653-84 to infrared radiant material
n〉=0.85), spectral emittance and wave band radiant-energy spectrum gamma flux density (as Fig. 2, Fig. 3) through SEM-1 infra-red material emittance device measuring therefrom draw normal direction total emissivity ε such as table 2.
Table 2
| Wave band | 2.5-20μm | 4-20μm | 5-20μm |
| εn | 0.91-0.92 | 0.92-0.93 | 0.93-0.94 |
Table 3 is the ultimate compression strength of porous ceramics under 950-1200 ℃ of sintering temperature with the preparation of present embodiment method.
Table 3
| Sintering temperature ℃ | 950 | 980 | 1150 | 1200 |
| Ultimate compression strength Mpa | 1.2-1.4 | 1.3-1.5 | 4.7-4.9 | 4.8-5.0 |
As can be seen from Table 3, the invention solves≤1200 ℃ of technical barriers that sintering strength is low.
To be not limited to be the described binding agent of present embodiment to employed binding agent in the process of preparation porous ceramics, also can be water, also can be the described binding agent of Chinese patent publication number CN1793268A, can realize identical technique effect.
Embodiment two:
The weight percent of each composition of aggregate in the present embodiment is: lightweight is floated pearl 27-43%, Suzhou soil 25-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 7-10%, high emissivity material 7-13%, coal dust 2-4%;
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 42%, Manganse Dioxide 20%, behind cobalt sesquioxide 14%, cupric oxide 13%, cerium dioxide 11% mixing, sintering 0.8h makes under 1270-1275 ℃ of condition.
Each weight ratio of constituents example of binding agent is: silicochromium aluminium complex sol 80-85%, silicone resin 15-20%;
Binding agent and aggregate weight ratio are 33-36%:64-67%.
The volume density that experiment showed, the described porous ceramics of present embodiment is 0.90-0.99g/cm
3, can be at 950-1150 ℃ temperature sintering, 100 ℃, 900 ℃ thermal conductivity is respectively 0.042-0.046,0.316-0.321w/mk, and the normal direction total emissivity of the full infrared band of 2.5-20 μ m is 0.91-0.92.
Embodiment three:
Be that with embodiment two differences also contain the sintering agent smaller or equal to aggregate gross weight 1% in the described aggregate of present embodiment, described sintering agent is a frit.Other are identical with embodiment two.Sintering agent can improve the flowability and the sintering character of slurry, reduces sintering temperature, and give the green compact certain intensity when low temperature.
Experiment showed, that the described porous ceramics of present embodiment can be at 950-1100 ℃ temperature sintering.
Embodiment four:
The weight percent of each composition of aggregate in the present embodiment is: lightweight is floated pearl 30-40%, Suzhou soil 30-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 8-11%, high emissivity material 7-10%, coal dust 2-3%;
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 47%, Manganse Dioxide 24%, behind cobalt sesquioxide 10%, cupric oxide 9%, cerium dioxide 10% mixing, sintering 2h makes under 1262-1276 ℃ of condition.
Each weight ratio of constituents example of binding agent is: silicochromium aluminium complex sol 86-90%, silicone resin 10-14%;
Binding agent and aggregate weight ratio are 37-42%:58-63%.
The volume density that experiment showed, the described porous ceramics of present embodiment is 0.86-0.92g/cm
3, can be at 1000-1200 ℃ temperature sintering, 100 ℃, 900 ℃ thermal conductivity is respectively 0.029-0.035,0.310-0.315w/mk, and the normal direction total emissivity of the full infrared band of 2.5-20 μ m is 0.92-0.94.
Embodiment five:
Be that with embodiment four differences also contain the sintering agent smaller or equal to aggregate gross weight 3% in the described aggregate of present embodiment, described sintering agent is a frit.Other are identical with embodiment four.Sintering agent can improve the flowability and the sintering character of slurry, reduces sintering temperature, and give the green compact certain intensity when low temperature.
Experiment showed, that the described porous ceramics of present embodiment can be at 950-1100 ℃ temperature sintering.
Embodiment six:
The weight percent of each composition of aggregate in the present embodiment is: lightweight is floated pearl 27-35%, Suzhou soil 32-38%, aluminium sesquioxide microballon 11-14%, magnesium oxide 6-7%, high emissivity material 10-14%, coal dust 4-5%;
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 45%, Manganse Dioxide 23%, behind cobalt sesquioxide 13%, cupric oxide 9%, cerium dioxide 10% mixing, sintering 1.5h makes under 1290-1298 ℃ of condition.
Each weight ratio of constituents example of binding agent is: silicochromium aluminium complex sol 83-87%, silicone resin 13-17%;
Binding agent and aggregate weight ratio are 35-39%:61-65%.
The volume density that experiment showed, the described porous ceramics of present embodiment is 0.93-1.02g/cm
3, can be at 950-1200 ℃ temperature sintering, 100 ℃, 900 ℃ thermal conductivity is respectively 0.032-0.035,0.312-0.318w/mk, and the normal direction total emissivity of the full infrared band of 2.5-20 μ m is 0.91-0.93.
Embodiment seven:
Be that with embodiment six differences also contain the sintering agent smaller or equal to aggregate gross weight 5% in the described aggregate of present embodiment, described sintering agent is natural feldspar.Other are identical with embodiment six.Sintering agent can improve the flowability and the sintering character of slurry, reduces sintering temperature, and give the green compact certain intensity when low temperature.
The volume density that experiment showed, the described porous ceramics of present embodiment is 0.93-0.97g/cm
3, can be at 950-1100 ℃ temperature sintering.
Embodiment eight:
With following infrared radiation porous ceramics slurry spray on furnace lining firebrick.
Infrared radiation porous ceramics, its aggregate main component and weight percent are: lightweight is floated pearl 25%, Suzhou soil 35%, aluminium sesquioxide microballon 15%, magnesium oxide 5%, high emissivity material 10%, coal dust 5%, sintering agent frit 5%; The liquid material binding agent that matches with it is mainly: silicochromium aluminium complex sol 80%; Silicone resin 20%; Binding agent is 33%:67% with the ratio of aggregate.
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 44%, Manganse Dioxide 26%, behind cobalt sesquioxide 14%, cupric oxide 9%, cerium dioxide 7% mixing, sintering 2h makes under 1295 ℃ of conditions.
Prepare the method for infrared radiation porous ceramics at furnace lining, it in turn includes the following steps:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 150 ℃ of temperature condition, dry respectively; Fine ground respectively then, 290 orders that sieve are preserved stand-by respectively;
Described high emissivity material is by weight percentage: ferric oxide 45%, Manganse Dioxide 25%, behind cobalt sesquioxide 10%, cupric oxide 10%, cerium dioxide 10% mixing, sintering 1h makes under 1260-1300 ℃ of condition.
2), the molecule of preparation closed pores floats pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: by weight proportion, above-mentioned lightweight is floated pearl 25%, Suzhou soil 35%, aluminium sesquioxide microballon 15%, magnesium oxide 5%, high emissivity material 10%, coal dust 5%, sintering agent 5%; Mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand.Blow one time earlier with clean broom cleaning one time, and then with pressurized air.
5), slurry configuration: by described binding agent and aggregate weight percent is the 33%:67% configuration, and promptly 1 kilogram of aggregate is joined 0.49 kilogram of binding agent, stirs until evenly stand-by;
6), spray: adopt the wide aperture spray gun of spray coarse sand, the slurry that stirs is injected on the pretreated furnace lining firebrick.The pressurized air Ying Jing processing of deoiling.Air pressure maintains 2-4 kilogram/m2, gun slot be about 15-20cm by spray thing surface distance, thickness 2mm.
7), dry in the shade;
8), sintering: solidify with baker heat-agglomerating, firing temperature is 950 ℃.
Volume density with the porous ceramic film material of present embodiment method preparation is 0.95g/cm
3, having higher closed pore structure, the microtexture pattern of observing under the polarizing microscope that Germany comes card company to produce is as shown in Figure 1.
The thermal conductivity result such as the following table that adopt flat band method to measure:
| Temperature ℃ | 100 | 300 | 600 | 900 |
| Thermal conductivity (w/mk) | 0.034 | 0.175 | 0.306 | 0.320 |
Normal direction total emissivity following table:
| Wave band | 2.5-20μm | 4-20μm | 5-20μm |
| εn | 0.92 | 0.93 | 0.94 |
Ultimate compression strength following table under 950-1200 ℃ of sintering temperature:
| Sintering temperature ℃ | 950 | 980 | 1150 | 1200 |
| Ultimate compression strength Mpa | 1.3 | 1.4 | 4.8 | 4.9 |
Embodiment nine:
With following infrared radiation porous ceramics slurry spray on furnace lining firebrick.
Infrared radiation porous ceramics, its aggregate main component and weight percent are: lightweight floats that pearl 35%, Suzhou soil 28%, aluminium sesquioxide microballon 10%, magnesium oxide are 10%, high emissivity material 10%, coal dust 5%, sintering agent frit 3%; The liquid material binding agent that matches with it is mainly: silicochromium aluminium complex sol 85%; Silicone resin 1 5%; Binding agent is 39%:61% with the ratio of aggregate.
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 45%, Manganse Dioxide 25%, behind cobalt sesquioxide 12%, cupric oxide 10%, cerium dioxide 8% mixing, sintering 1.8h makes under 1260-1300 ℃ of condition.
Prepare the method for infrared radiation porous ceramics at furnace lining, it in turn includes the following steps:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 130-200 ℃ of temperature condition, dry respectively; Fine ground respectively then, the 280-320 order that sieves is preserved stand-by respectively;
2), the molecule of preparation closed pores floats pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: with above-mentioned lightweight float that pearl 35%, Suzhou soil 27%, aluminium sesquioxide microballon 10%, magnesium oxide are 10%, high emissivity material 10%, coal dust 5%, sintering agent 3%; Mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand.Blow one time earlier with clean broom cleaning one time, and then with pressurized air.
5), slurry configuration: the weight percent of pressing binding agent (silicochromium aluminium complex sol 85%, silicone resin 15%) and aggregate is that 39%:61% is configured, and promptly 1 kilogram of aggregate is joined 0.64 kilogram of binding agent, stirs until evenly stand-by;
6), spray: adopt the wide aperture spray gun of spray coarse sand, the slurry that stirs is injected on the pretreated furnace lining firebrick.The pressurized air Ying Jing processing of deoiling.Air pressure maintains 2-4 kilogram/m2, gun slot be about 15-20cm by spray thing surface distance, thickness 3mm.
7), dry in the shade;
8), sintering: solidify with baker heat-agglomerating, firing temperature is 1050 ℃.
Volume density with the porous ceramic film material of present embodiment method preparation is 0.89g/cm
3, have higher closed pore structure, the microtexture pattern such as the following table of under the polarizing microscope that Germany comes card company to produce, observing:
| Temperature ℃ | 100 | 300 | 600 | 900 |
| Thermal conductivity (w/mk) | 0.030 | 0.150 | 0.270 | 0.310 |
Normal direction total emissivity ε such as following table.
| Wave band | 2.5-20μm | 4-20μm | 5-20μm |
| εn | 0.92 | 0.93 | 0.94 |
The ultimate compression strength of porous ceramics under 950-1200 ℃ of sintering temperature that following table prepares with the present embodiment method.
| Sintering temperature ℃ | 950 | 980 | 1150 | 1200 |
| Ultimate compression strength Mpa | 1.4 | 1.5 | 4.9 | 5.0 |
Embodiment ten:
With following infrared radiation porous ceramics slurry spray on furnace lining firebrick.
Infrared radiation porous ceramics, its aggregate main component and weight percent are: lightweight floats that pearl 40%, Suzhou soil 25%, aluminium sesquioxide microballon 7%, magnesium oxide are 12%, high emissivity material 11%, coal dust 4%, the natural feldspar 1% of sintering agent; The liquid material binding agent that matches with it is mainly: silicochromium aluminium complex sol 90%; Silicone resin 10%; Binding agent is 39%:51% with the ratio of aggregate.
Wherein, the high emissivity material is made up of the material of following weight percent: ferric oxide 48%, Manganse Dioxide 22%, behind cobalt sesquioxide 12%, cupric oxide 10%, cerium dioxide 8% mixing, sintering 1.6h makes under 1260-1300 ℃ of condition.
Prepare the method for infrared radiation porous ceramics at furnace lining, it in turn includes the following steps:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 130-200 ℃ of temperature condition, dry respectively; Fine ground respectively then, the 280-320 order that sieves is preserved stand-by respectively;
2), the molecule of preparation closed pores floats pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: with above-mentioned lightweight float that pearl 40%, Suzhou soil 25%, aluminium sesquioxide microballon 10%, magnesium oxide are 10%, high emissivity material 10%, coal dust 5%, sintering agent 3%; Mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand.Blow one time earlier with clean broom cleaning one time, and then with pressurized air.
5), slurry configuration: the weight percent of pressing binding agent (silicochromium aluminium complex sol 90%, silicone resin 10%) and aggregate is that 42%:58%% is configured, and promptly 1 kilogram of aggregate is joined 0.72 kilogram of binding agent, stirs until evenly stand-by;
6), spray: adopt the wide aperture spray gun of spray coarse sand, the slurry that stirs is injected on the pretreated furnace lining firebrick.The pressurized air Ying Jing processing of deoiling.Air pressure maintains 2-4 kilogram/m2, gun slot be about 15-20cm by spray thing surface distance, thickness 3mm.
7), dry in the shade;
8), sintering: solidify with baker heat-agglomerating, firing temperature is 1200 ℃.
Volume density with the porous ceramic film material of present embodiment method preparation is 0.96g/cm
3, the thermal conductivity result such as the following table that adopt flat band method to measure:
| Temperature ℃ | 100 | 300 | 600 | 900 |
| Thermal conductivity (w/mk) | 0.045 | 0.174 | 0.293 | 0.319 |
ε is as shown in the table for the normal direction total emissivity:
| Wave band | 2.5-20μ | 4-20μm | 5-20μm |
| εn | 0.92 | 0.93 | 0.94 |
| Sintering temperature ℃ | 950 | 980 | 1150 | 1200 |
| Ultimate compression strength Mpa | 1.32 | 1.46 | 4.88 | 4.86 |
Claims (10)
1. the infrared radiation porous ceramics on the furnace lining firebrick is characterized in that aggregate contains following component in percentage by weight in essence by aggregate and adhesive preparation form slurry:
Lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-15%, magnesium oxide is 5-12%, high emissivity material 5-15%, coal dust 1-5%.
2. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 1 is characterized in that: the high emissivity material is made up of the material of following weight percent:
Ferric oxide 42-48%, Manganse Dioxide 20-30%, behind cobalt sesquioxide 8-14%, cupric oxide 8-13%, the cerium dioxide 7-12% mixing, sintering 0.8-2h makes under 1260-1300 ℃ of condition.
3. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 1 is characterized in that: the particle of aluminium sesquioxide microballon is the 100-180 order.
4. according to the infrared radiation porous ceramics on any described furnace lining firebrick of claim 1-3, it is characterized in that:
Described binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 80-90%, silicone resin 10-20%;
Weight percent between described binding agent and the aggregate is 33-42%:58-67%.
5. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 4 is characterized in that:
Aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 27-43%, Suzhou soil 25-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 7-10%, high emissivity material 7-13%, coal dust 2-4%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 80-85%, silicone resin 15-20%;
Binding agent and aggregate weight ratio are 33-36%:64-67%.
6. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 4 is characterized in that:
Aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 30-40%, Suzhou soil 30-38%, aluminium sesquioxide microballon 7-13%, magnesium oxide 8-11%, high emissivity material 7-10%, coal dust 2-3%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 86-90%, silicone resin 10-14%;
Binding agent and aggregate weight ratio are 37-42%:58-63%.
7. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 4 is characterized in that: aggregate mainly is made up of following component in percentage by weight: lightweight is floated pearl 27-35%, Suzhou soil 32-38%, aluminium sesquioxide microballon 11-14%, magnesium oxide 6-7%, high emissivity material 10-14%, coal dust 4-5%;
Binding agent contains following component in percentage by weight: silicochromium aluminium complex sol 83-87%, silicone resin 13-17%;
Binding agent and aggregate weight ratio are 35-39%: 61-65%.
8. the infrared radiation porous ceramics on the furnace lining firebrick according to claim 4 is characterized in that: also contain the sintering agent smaller or equal to aggregate gross weight 5% in the aggregate, sintering agent is frit or natural feldspar.
9. an aforesaid right requires the preparation method of described porous ceramics, it is characterized in that may further comprise the steps successively:
1), with Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, left standstill 30-60 minute, remove ball milling liquid after; Under 130-200 ℃ of temperature condition, dry respectively; Fine ground respectively then, the 280-320 order that sieves is preserved stand-by respectively;
2), the molecule lightweight of preparation closed pores is floated pearl: flyash is poured in the pond fully stirred, allow its natural sedimentation then, fish for the material that swims in the water surface, dry, preserve stand-by;
3), aggregate configuration: the pore-forming material lightweight is floated pearl 20-45%, Suzhou soil 20-40%, aluminium sesquioxide microballon 5-1 5%, magnesium oxide 5-12%, high emissivity material 5-15%, coal dust 1-5% by weight proportion, and mixing and stirring is preserved stand-by;
4), substrate pretreated: remove lip-deep floating dust of furnace lining firebrick and ash, sand;
5), slurry configuration: the weight percent by binding agent and aggregate is 33-42%: 58-67% is configured, and stirs until evenly stand-by;
6), spray: adopt the wide aperture spray gun of spray coarse sand, the slurry that stirs is injected on the furnace lining firebrick;
7), dry in the shade;
8), sintering: solidify with baker heat-agglomerating.
10. the preparation method of porous ceramics according to claim 9 is characterized in that: during spray, and the used pressurized air Ying Jing of the spray gun processing of deoiling, air pressure maintains 2-4 kilogram/m
2, gun slot be 15-20cm by spray thing surface distance, spray thickness 〉=2mm.
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