CN112778008A - Aluminum titanate porous ceramic, preparation method thereof and porous medium burner - Google Patents
Aluminum titanate porous ceramic, preparation method thereof and porous medium burner Download PDFInfo
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Abstract
An aluminum titanate porous ceramic, a preparation method thereof and a porous medium burner belong to the technical field of ceramics. The aluminum titanate porous ceramic is prepared by pyrolyzing and sintering slurry of raw materials, wherein the raw materials comprise: al (Al)2O3、TiO2A stabilizer, an adhesive, a dispersant and a solvent for dissolving the adhesive; wherein, Al2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 50-70: 30-50: 1-10; the stabilizer is at least one selected from magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide. The preparation method comprises the following steps: and soaking the foamed plastic with pores into the slurry of the raw materials, coating the slurry on the surface of the foamed plastic, drying and curing the foamed plastic after coating the slurry, and then sintering and molding the foamed plastic after pyrolysis. Which can improve the existingSome aluminum titanate porous ceramics have poor high thermal shock resistance.
Description
Technical Field
The application relates to the technical field of ceramics, in particular to aluminum titanate porous ceramic, a preparation method thereof and a porous medium burner.
Background
The aluminum titanate porous ceramic and the cordierite ceramic are famous low-thermal-expansion ceramic materials, wherein the aluminum titanate porous ceramic has better high-temperature resistance (the melting point reaches 1860 ℃), small thermal expansion coefficient, excellent thermal shock resistance, excellent erosion resistance and the characteristic of no infiltration of molten metal at high temperature, and is widely applied to the fields of metal smelting, automobile industry, refractory materials and the like.
However, the aluminum titanate porous ceramics have the following disadvantages: is easily decomposed into alumina and titanium dioxide at the medium-high temperature stage (800-.
Disclosure of Invention
The application provides an aluminum titanate porous ceramic, a preparation method thereof and a porous medium burner, which can solve the problem that the existing aluminum titanate porous ceramic is poor in high-temperature thermal shock resistance.
The embodiment of the application is realized as follows:
in a first aspect, embodiments of the present application provide an aluminum titanate porous ceramic, which is prepared by pyrolyzing and sintering a slurry of raw materials, where the raw materials include: al (Al)2O3、TiO2A stabilizer, an adhesive, a dispersant and a solvent for dissolving the adhesive; wherein, Al2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 50-70: 30-50: 1-10; the stabilizer is at least one of magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide;
Al2O3、TiO2the total weight of the stabilizer and the adhesive is M, the weight of the adhesive, the weight of the dispersant and the ratio of the weight of the solvent to M are 18-50: 0.1-10: 30-50: 100.
in a second aspect, embodiments of the present application provide a method for preparing the aluminum titanate porous ceramic of the first aspect, including:
and soaking the foamed plastic with pores into the slurry of the raw materials, coating the slurry on the surface of the skeleton of the foamed plastic, drying and curing after coating, and then sintering and molding after pyrolysis.
In a third aspect, embodiments of the present application provide a porous medium burner comprising an aluminum titanate porous ceramic according to an embodiment of the first aspect of the present application or an aluminum titanate porous ceramic produced by a method of producing an aluminum titanate porous ceramic according to an embodiment of the second aspect of the present application.
The aluminum titanate porous ceramic, the preparation method thereof and the porous medium burner provided by the embodiment of the application have the beneficial effects that:
the solvent in the raw materials can dissolve the adhesive, and the dispersing agent can ensure Al2O3、TiO2And a stabilizer uniformly dispersed in the dissolved adhesive, the dissolved adhesive being capable of dissolving Al2O3、TiO2And the foam plastic with pores is dried and solidified after being pasted with the stabilizer, so that the slurry is solidified on the surface of the framework of the foam plastic. Wherein, Al in the examples of the present application2O3、TiO2The proportion of the stabilizer, the adhesive, the dispersant and the solvent is proper, the viscosity of the slurry after the raw materials are mixed is proper, and the slurry is easy to be pasted on the surface of the framework of the foam plastic.
The foamed plastic is dried and solidified after being coated with slurry, and thenThe binder solidifies after pyrolysis to Al2O3、TiO2Solidifying together with stabilizer, decomposing foam plastics, and sintering to form Al2O3And TiO2The aluminum titanate is generated through reaction, and stabilizers of magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide stabilize the crystalline phase of the aluminum titanate to reduce the decomposition of the aluminum titanate, so that the prepared aluminum titanate porous ceramic has high thermal shock resistance, wherein the pores of the foam plastic correspond to the pores of the aluminum titanate porous ceramic, so that the porosity of the aluminum titanate porous ceramic is high, and the combustion efficiency can be improved when the aluminum titanate porous ceramic is applied to a porous medium combustor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a view showing an aluminum titanate porous ceramic obtained in example 1 of the present application;
FIG. 2 is an SEM photograph of an aluminum titanate porous ceramic of example 1 of the present application;
FIG. 3 is an SEM photograph of the aluminum titanate porous ceramic of example 1 of the present application after being subjected to water-cooling thermal shock 50 times;
FIG. 4 is an XRD pattern of the porous aluminum titanate ceramic of example 1 of the present application before and after 50 thermal water-cooling thermal shocks.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of the aluminum titanate porous ceramic, the method for preparing the same, and the porous medium burner according to the embodiments of the present application:
in a first aspect, embodiments of the present application provide an aluminum titanate porous ceramic, which is prepared by pyrolyzing and sintering a slurry of raw materials, where the raw materials include: al (Al)2O3、TiO2A stabilizer, an adhesive, a dispersant and a solvent for dissolving the adhesive; wherein, Al2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 50-70: 30-50: 1-10; the stabilizer is at least one of magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide;
Al2O3、TiO2the total weight of the stabilizer and the adhesive is M, the weight of the adhesive, the weight of the dispersant and the ratio of the weight of the solvent to M are 18-50: 0.1-10: 30-50: 100.
the solvent in the raw materials can dissolve the adhesive, and the dispersing agent can ensure Al2O3、TiO2And a stabilizer uniformly dispersed in the dissolved adhesive, the dissolved adhesive being capable of dissolving Al2O3、TiO2And a stabilizer to bond together. Al in the course of sintering and forming2O3And TiO2The aluminum titanate is generated through reaction, and the stabilizing agents of magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide can stabilize the crystalline phase of the aluminum titanate to reduce the decomposition of the aluminum titanate, so that the aluminum titanate porous ceramic has higher thermal shock resistance. It should be noted that magnesium carbonate may be provided by magnesite, and the main component of magnesite is magnesium carbonate.
Illustratively, the stabilizer is selected from at least two of magnesium oxide, iron oxide, lanthanum oxide, and silicon dioxide. The stabilizer combination in the combination mode has better stabilizing effect.
Wherein, Al2O3、TiO2The proportion of the stabilizer, the adhesive, the dispersant and the solvent is proper, and the viscosity of the slurry after the raw materials are mixed is proper, so that the slurry can be hung on the surface of the framework of the foam plastic.
Alternatively, Al2O3The particle size of (A) is selected from the group consisting of D50-0.5-5 μm, TiO2The particle size of (A) is selected so that D50 is 0.1 to 1 μm, and the particle size of the stabilizer is selected so that D50 is 0.5 to 2 μm. Note that D50-0.5 to 5 μm means that the proportion of particles having a particle size in the range of 0.5 to 5 μm is 50%.
Illustratively, the alumina is selected from at least one of alpha-alumina, beta-alumina, gamma-alumina, and aluminum hydroxide. Illustratively, the titanium dioxide includes at least one of anatase type, rutile type, and amorphous titanium dioxide.
Further, in one possible embodiment, Al2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 60-62: 38-40: 1-5; the ratio of the weight of the adhesive, the weight of the dispersing agent and the weight of the solvent to M is 30-35: 1-2: 40: 100. the components in the proportion range enable the prepared aluminum titanate porous ceramic to have better thermal shock resistance.
Illustratively, the binder is selected from at least one of phenolic resin, epoxy resin, polyacrylic acid resin, and polyvinyl butyral. These kinds of adhesives can be used to bond Al2O3、TiO2And a stabilizer bond well together.
When the binder is selected from at least one of phenolic resin, epoxy resin, polyacrylic acid resin and polyvinyl butyral, the solvent includes ethanol. Ethanol can dissolve these types of adhesives well.
Alternatively, the solvent comprises ethanol and butanone, wherein the ethanol is used for dissolving the adhesive, and the butanone and the ethanol can be used for realizing solubilization and dispersion effects. Illustratively, the volume ratio of ethanol to butanone is 1-4: 1 is, for example, 1:1, 2:1, 3:1 or 4: 1.
Optionally, the dispersant is selected from at least one of castor oil, triolein, and tween 20. These kinds of dispersants all have a good dispersing effect.
In a second aspect, embodiments of the present application provide a method for preparing the aluminum titanate porous ceramic of the first aspect, including: and soaking the foamed plastic with pores into the slurry of the raw materials, coating the slurry on the surface of the skeleton of the foamed plastic, drying and curing after coating, and then sintering and molding after pyrolysis.
After the foamed plastic with pores is coated with slurry, drying and curing are carried out, so that the slurry is cured on the surface of the skeleton of the foamed plastic, and after pyrolysis, the adhesive is cured so that Al is formed2O3、TiO2And the stabilizer are consolidated together, and the foamed plastic is decomposed at the same time, so that the pores of the foamed plastic correspond to the pores of the aluminum titanate porous ceramic, and the prepared aluminum titanate foamed ceramic has higher porosity. Alternatively, the foam of the embodiments of the present application is a polyurethane foam, a polystyrene foam, or a polyvinyl acetate foam. The polyurethane foam is a polyurethane soft foam exemplarily, the polyurethane soft foam has an open-cell structure, the pores are highly communicated with one another, the polyurethane soft foam is very suitable for gas circulation, the flow resistance is low, the polyurethane soft foam is adopted for slurry hanging, and subsequently prepared aluminum titanate foamed ceramics can be used in a porous medium burner to fully and uniformly mix air and fuel gas, so that the combustion efficiency is improved.
Al in the course of sintering and forming2O3And TiO2The aluminum titanate is generated through reaction, and stabilizing agents of magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide stabilize the crystalline phase of the aluminum titanate to reduce the decomposition of the aluminum titanate, so that the prepared aluminum titanate porous ceramic has high thermal shock resistance, and the crystalline phase of the aluminum titanate porous ceramic is stably doped aluminum titanate.
In addition, after the foamed plastic is immersed in the slurry of the raw materials, redundant slurry can be thrown off through centrifugation of the foamed plastic after slurry hanging, the slurry is uniformly blown by compressed air, and then drying and solidification are carried out, so that the probability that the slurry blocks the pores of the foamed plastic is reduced. Wherein the pressure of the compressed air is optionally 0.3-0.6 MPa. The temperature for drying and curing is 50-150 deg.C, such as 50 deg.C, 80 deg.C, 100 deg.C, 120 deg.C or 150 deg.C.
It should be noted that the steps of slurry coating, centrifugation, purging, drying and curing can be repeated until the foamed plastic slurry coating reaches the target volume fraction or the target mass fraction. The determination method of the target volume fraction and the target mass fraction comprises the following steps: multiplying the length, the width and the height of the foam plastic to obtain a first volume, multiplying the first volume by the density of the adopted aluminum titanate to obtain a first weight, dividing the weight of the hanging slurry by the density of the adopted aluminum titanate to obtain a second volume, and dividing the second volume by the first volume to obtain a target volume fraction; dividing the weight of the hanging pulp by the first weight to be a target mass fraction.
In one possible embodiment, the temperature of pyrolysis is 800-.
The adhesive can be fully cured at the pyrolysis temperature of 800-1000 ℃ and the heat preservation time of 60-300min, and the foamed plastic can be completely decomposed. Illustratively, the pyrolysis temperature is any one of 800 ℃, 850 ℃, 900 ℃, 950 ℃ and 1000 ℃, or a range between any two. Optionally, the holding time for the pyrolysis process is any one of 60min, 90min, 120min, 150min, 180min, 210min, 240min, and 300min or a range between any two.
Alternatively, the pyrolysis process is carried out in an inert atmosphere or vacuum environment. Compared with pyrolysis in the air or oxygen atmosphere, pyrolysis in the inert atmosphere or vacuum environment can enable the curing effect of the adhesive to be better, the green body strength of the aluminum titanate porous ceramic after the pyrolysis process is better, and sintering can be carried out after primary processing. It will be appreciated that the pyrolysis process may also be carried out under an air or oxygen atmosphere.
The sintering and forming steps are carried out in an air atmosphere or an oxygen atmosphere, the pyrolysis process and the sintering process can be carried out in the same sintering furnace, and in the moment, the pyrolysis is also carried out in the air or the oxygen atmosphere. The pyrolysis process and the sintering process can be separately carried out in different sintering furnaces, and the pyrolysis process can be carried out after being cooled to room temperature, or the pyrolysis process can be carried out after being finished.
Illustratively, the temperature of the sintering molding is 1500-. The heat preservation is carried out at the sintering temperature of 1500-1600 ℃ for 120-360min, the aluminum titanate porous ceramic can be prepared, and the heat preservation time is enough to refine the crystal grains and improve the mechanical property.
Optionally, the step of sintering and forming comprises: heating to 1000 deg.C at a rate of 0.5-1 deg.C/min, heating to 1350 deg.C at a rate of 1-10 deg.C/min, and heating to sintering temperature at a rate of 0.1-0.5 deg.C/min.
At a temperature below 1000 ℃, Al2O3And TiO2Reaction occurs, and the Al can be ensured by heating slowly at the heating rate of 0.5-1 ℃/min2O3And TiO2Fully reacting to generate the aluminum titanate. Illustratively, the ramp rate for ramping up to 1000 ℃ is any one of, or a range between, 0.5 ℃/min, 0.6 ℃/min, 0.8 ℃/min, and 1 ℃/min.
In the temperature range of 1000-1350 ℃, the aluminum titanate crystal phase is easy to decompose, and the temperature is quickly increased at the temperature increase rate of 1-10 ℃/min, so that the decomposition condition of the aluminum titanate crystal phase can be improved. Illustratively, the ramp rate is any one or a range between any two of 1 deg.C/min, 3 deg.C/min, 5 deg.C/min, 7 deg.C/min, and 10 deg.C/min over a temperature range of 1000-1350 deg.C.
In the temperature range of 1350 ℃ or above, the crystal grains can be fully refined by slowly increasing the temperature at the temperature increase rate of 0.1-0.5 ℃/min. Illustratively, the ramp rate is any one of, or a range between any two of, 0.1 deg.C/min, 0.2 deg.C/min, 0.4 deg.C/min, and 0.5 deg.C/min.
In a third aspect, embodiments of the present application provide a porous medium burner comprising an aluminum titanate porous ceramic according to an embodiment of the first aspect of the present application or an aluminum titanate porous ceramic produced by a method of producing an aluminum titanate porous ceramic according to an embodiment of the second aspect of the present application.
The aluminum titanate porous ceramic provided by the embodiment of the application has high porosity, and can increase combustion efficiency when being applied to a porous medium combustor.
The aluminum titanate porous ceramics and the preparation method thereof and the porous medium burner of the present application will be described in further detail with reference to examples.
Example 1
This example provides an aluminum titanate porous ceramic, the raw material of which comprises: calcining alpha-Al2O32.5kg of powder (D50 ═ 1 μm), 2.5kg of anatase titanium dioxide (D50 ═ 0.3 μm), 150g of magnesia powder (D50 ═ 0.5 μm), 11.5g of ferric oxide (analytically pure), 20g of lanthanum oxide (analytically pure), 1kg of phenolic resin, 10g of Tween 20, 1600g of ethanol and 400g of butanone.
The method for preparing the aluminum titanate porous ceramic of the embodiment comprises the following steps:
placing the raw materials in a ball milling tank, ball milling for 4 hours to prepare slurry, cutting polyurethane sponge into 300mmx300mmx25mm, soaking the sponge into the slurry, taking out, centrifuging, throwing off redundant slurry, and uniformly blowing and sweeping the slurry hung on a precursor by using compressed air, wherein the pressure of the compressed air is 0.3 MPa. Placing the polyurethane sponge after slurry coating in an oven, drying and curing at 100 ℃, and repeating the processes of slurry soaking, centrifuging, blowing, drying and curing to obtain an aluminum titanate foam precursor with the volume fraction of 20%; placing the aluminum titanate foam precursor in a vacuum degreasing furnace, performing pyrolysis degreasing for 15 hours at the temperature of 850 ℃, placing the pyrolyzed aluminum titanate foam precursor in a high-temperature electric furnace, and performing heat preservation for 5 hours at the temperature of 1550 ℃ in an air atmosphere to obtain the aluminum titanate porous ceramic, wherein the aluminum titanate porous ceramic is shown in figure 1.
Example 2
This example provides an aluminum titanate porous ceramic, which comprises the following raw materials: calcining alpha-Al2O33kg of powder (D50 ═ 2 μm), 2kg of rutile titanium dioxide (D50 ═ 0.5 μm), 350g of magnesite powder (D50 ═ 2 μm), 15g of ferric oxide (analytically pure), 40g of lanthanum oxide (analytically pure), 1.2kg of phenolic resin, 20g of castor oil, 1500g of ethanol and 500g of butanone.
The method for preparing the aluminum titanate porous ceramic of the embodiment comprises the following steps:
placing the raw materials in a ball milling tank, ball milling for 5 hours to prepare slurry, cutting polyurethane sponge into 140mmx290mmx25mm, soaking the polyurethane sponge into the slurry, taking out, centrifuging, throwing off redundant slurry, and uniformly blowing and sweeping the slurry hung on the precursor by using compressed air, wherein the pressure of the compressed air is 0.6 MPa. Placing the polyurethane sponge after slurry coating in an oven, drying and curing at 120 ℃, and repeating the processes of slurry soaking, centrifuging, blowing, drying and curing to obtain an aluminum titanate foam precursor with the volume fraction of 30%; and (2) placing the aluminum titanate foam precursor in a vacuum degreasing furnace, performing pyrolysis degreasing for 18 hours at the temperature of 900 ℃, placing the pyrolyzed aluminum titanate foam precursor in a high-temperature electric furnace, and performing heat preservation for 4 hours at the temperature of 1600 ℃ to obtain the aluminum titanate porous ceramic.
Example 3
This example provides an aluminum titanate porous ceramic, which comprises the following raw materials: al (Al)2O33.1kg of powder (D50 ═ 1 μm), 1.9kg of anatase titanium dioxide (D50 ═ 0.3 μm), 100g of magnesia powder (D50 ═ 1 μm), 200g of fine silica powder (D50 ═ 1 μm), 9g of ferric oxide (analytically pure), 16g of lanthanum oxide (analytically pure), 1.1kg of phenolic resin, 10g of castor oil, 10g of glycerol trioleate, 1600g of ethanol and 400g of butanone.
The method for preparing the aluminum titanate porous ceramic of the embodiment comprises the following steps:
placing the raw materials in a ball milling tank, ball milling for 4 hours to prepare slurry, cutting polyurethane sponge into 100mmx140mmx25mm, soaking the polyurethane sponge into the slurry, taking out, centrifuging, throwing off redundant slurry, and blowing and uniformly blowing the slurry hung on the precursor by using compressed air, wherein the pressure of the compressed air is 0.5 MPa. Placing the polyurethane sponge after slurry coating in an oven, drying and curing at 110 ℃, and repeating the processes of slurry soaking, centrifuging, blowing, drying and curing to obtain an aluminum titanate foam precursor with the volume fraction of 20%; placing the aluminum titanate foam precursor in an air atmosphere high-temperature electric furnace, firstly carrying out pyrolysis degreasing for 15 hours at the temperature of 850 ℃, and then carrying out heat preservation for 5 hours at the temperature of 1500 ℃ to obtain the aluminum titanate porous ceramic.
Test example 1
The porosity of the aluminum titanate porous ceramics obtained in examples 1 to 3 was measured by the water discharge method, and the results are shown in table 1.
TABLE 1 porosity of aluminum titanate porous ceramics
| Example 1 | Example 2 | Example 3 | |
| Porosity of the material | 80.5％ | 81％ | 82％ |
As can be seen from the results in Table 1, the aluminum titanate porous ceramics of examples 1 to 3 of the present application all have a high porosity.
Test example 2
The aluminum titanate porous ceramics prepared in examples 1 to 3 were subjected to a water-cooling thermal shock test, which included the steps of: firstly heating a muffle furnace to 1400 ℃, then putting the aluminum titanate porous ceramic into the furnace, preserving heat for 5min, clamping the aluminum titanate porous ceramic out of the furnace, putting the aluminum titanate porous ceramic into water, taking the aluminum titanate porous ceramic out of the water, drying the aluminum titanate porous ceramic, observing whether the aluminum titanate porous ceramic cracks or not by using a magnifying glass, and continuing the circulating water-cooling thermal shock process if the aluminum titanate porous ceramic does not.
And (3) testing results: the aluminum titanate porous ceramics of examples 1 to 3 were not cracked after 10 times of water-cooling thermal shock.
Test example 3
The aluminum titanate porous ceramic obtained in example 1 was observed under an electron scanning microscope, and an SEM image thereof is shown in FIG. 2. And the aluminum titanate porous ceramic obtained in example 1 was subjected to a water-cooling thermal shock test for 50 times and observed under an electron scanning microscope to obtain an SEM image as shown in FIG. 3. The water-cooling thermal shock test comprises the following steps: firstly, heating a muffle furnace to 1200 ℃, then putting the aluminum titanate porous ceramic into the furnace, preserving heat for 5min, then clamping the aluminum titanate porous ceramic out, putting the aluminum titanate porous ceramic into water, taking the aluminum titanate porous ceramic out of the water, drying the aluminum titanate porous ceramic, and then repeatedly cycling the processes.
Comparing fig. 2 and 3, it was found that the aluminum titanate porous ceramic of example 1 was not cracked after being subjected to water-cooling thermal shock 50 times. It is demonstrated that the aluminum titanate porous ceramic of example 1 to which the stabilizer was added has excellent thermal shock resistance.
Test example 4
XRD test was performed on the aluminum titanate porous ceramic obtained in example 1, and XRD test was performed on the aluminum titanate porous ceramic obtained in example 1 after water-cooling thermal shock test was performed 50 times, and the XRD pattern obtained is shown in FIG. 4. The water-cooling thermal shock test comprises the following steps: firstly, heating a muffle furnace to 1200 ℃, then putting the aluminum titanate porous ceramic into the furnace, preserving heat for 5min, then clamping the aluminum titanate porous ceramic out, putting the aluminum titanate porous ceramic into water, taking the aluminum titanate porous ceramic out of the water, drying the aluminum titanate porous ceramic, and then repeatedly cycling the processes.
Test example 5
The compressive strength of the aluminum titanate porous ceramics obtained in examples 1 to 3 was measured, and the results are shown in Table 2.
TABLE 2 compressive strength of porous aluminum titanate ceramics
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The aluminum titanate porous ceramic is characterized by being prepared by pyrolyzing and sintering slurry of raw materials, wherein the raw materials comprise: al (Al)2O3、TiO2The adhesive comprises a stabilizer, an adhesive, a dispersant and a solvent for dissolving the adhesive; wherein, Al2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 50-70: 30-50: 1-10; the stabilizer is selected from magnesium oxide, magnesium carbonate, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxideAt least one of;
Al2O3、TiO2and the total weight of the stabilizer is M, the ratio of the weight of the adhesive, the weight of the dispersant and the weight of the solvent to M is 18-50: 0.1-10: 30-50: 100.
2. the aluminum titanate porous ceramic of claim 1, wherein Al is2O3、TiO2The weight ratio of the stabilizer to the stabilizer is 60-62: 38-40: 1-5; the ratio of the weight of the adhesive, the weight of the dispersing agent and the weight of the solvent to M is 30-35: 1-2: 35-40: 100.
3. the aluminum titanate porous ceramic according to claim 1 or 2, wherein the binder is at least one selected from the group consisting of a phenol resin, an epoxy resin, a polyacrylic acid resin, and polyvinyl butyral.
4. The aluminum titanate porous ceramic of claim 3, wherein the solvent comprises ethanol;
alternatively, the solvent comprises ethanol and butanone;
optionally, the solvent comprises a solvent in a volume ratio of 1-4: 1 ethanol and butanone.
5. The aluminum titanate porous ceramic of claim 1 or 2, wherein the dispersant is selected from at least one of castor oil, triolein, and tween 20.
6. A method for producing the aluminum titanate porous ceramic according to any one of claims 1 to 5, comprising:
and soaking the foamed plastic with pores into the slurry of the raw material, coating the slurry on the surface of the skeleton of the foamed plastic, drying and curing after coating, and then sintering and molding after pyrolysis.
7. The method for preparing aluminum titanate porous ceramic according to claim 6, wherein the pyrolysis temperature is 800-1000 ℃, and the heat preservation time in the pyrolysis process is 60-300 min;
alternatively, the pyrolysis process is carried out in an inert atmosphere or vacuum environment.
8. The method as claimed in claim 6, wherein the sintering temperature is 1500-1600 deg.C, and the holding time is 120-360 min.
9. The method of preparing an aluminum titanate porous ceramic according to claim 8, wherein the step of sintering and shaping comprises: heating to 1000 ℃ at a heating rate of 0.5-1 ℃/min, then heating to 1350 ℃ at a heating rate of 1-10 ℃/min, and then heating to the sintering molding temperature at a heating rate of 0.1-0.5 ℃/min.
10. A porous medium burner, wherein the porous medium combustion chamber in the porous medium burner has the aluminum titanate porous ceramic according to any one of claims 1 to 5 or the aluminum titanate porous ceramic produced by the method for producing the aluminum titanate porous ceramic according to any one of claims 6 to 9.
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