CN112723903A - Aluminum titanate-mullite composite ceramic, preparation method thereof, porous medium burner and ceramic filter - Google Patents
Aluminum titanate-mullite composite ceramic, preparation method thereof, porous medium burner and ceramic filter Download PDFInfo
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Abstract
An aluminum titanate-mullite composite ceramic and a preparation method thereof, a porous medium burner and a ceramic filter belong to the technical field of ceramics. The aluminum titanate-mullite composite ceramic comprises an aluminum titanate crystal phase and a mullite crystal phase in a mass ratio of 6-7: 3-4; the stabilizing component of the aluminum titanate-mullite composite ceramic is at least one selected from magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide. The aluminum titanate-mullite composite ceramic provided by the embodiment of the application has good sintering strength and thermal shock resistance, and overcomes the defects of easy fracture and low sintering strength of the existing aluminum titanate ceramic.
Description
Technical Field
The application relates to the technical field of ceramics, in particular to aluminum titanate-mullite composite ceramic and a preparation method thereof, a porous medium burner and a ceramic filter.
Background
The aluminum titanate ceramic has the advantages of good high temperature resistance and small thermal expansion coefficient, and is widely applied to the fields of metal smelting, automobile industry, refractory materials and the like. However, aluminum titanate ceramics are easily broken at high-temperature sintering and have low sintering strength.
Disclosure of Invention
The application provides an aluminum titanate-mullite composite ceramic and a preparation method thereof, a porous medium burner and a ceramic filter.
The embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides an aluminum titanate-mullite composite ceramic, which includes an aluminum titanate crystalline phase and a mullite crystalline phase in a mass ratio of 6-7: 3-4; the stabilizing component of the aluminum titanate-mullite composite ceramic is at least one selected from magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide.
In a second aspect, an embodiment of the present application provides a method for preparing an aluminum titanate-mullite composite ceramic according to the embodiment of the first aspect, wherein the raw materials of the aluminum titanate-mullite composite ceramic include alumina, silica, titania, mullite powder, a dispersant, a binder, a stabilizer for stabilizing a crystalline phase of aluminum titanate, and a solvent for dissolving the binder; the weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 5-35: 0.1-10: 3-25: 50-90: 0.1 to 1;
the preparation method comprises the following steps: and (3) immersing the framework material with the three-dimensional net structure into the slurry of the raw materials to make the framework surface of the framework material coated with slurry, and then performing pyrolysis and sintering molding to decompose the framework material.
In a third aspect, embodiments of the present application provide a porous medium burner having the aluminum titanate-mullite composite ceramic of the first aspect therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
In a fourth aspect, embodiments of the present application provide a ceramic filter having the aluminum titanate-mullite composite ceramic of the first aspect therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
The aluminum titanate-mullite composite ceramic, the preparation method thereof, the porous medium burner and the ceramic filter have the beneficial effects that:
the adhesive in the raw materials can be dissolved in the solvent, the alumina, the titanium dioxide and the mullite powder can be bonded together by the dissolved adhesive, and the alumina, the titanium dioxide and the mullite powder can be uniformly dispersed in the dissolved adhesive by the dispersing agent. The framework surface of the framework material is hung with slurry, the adhesive is solidified during pyrolysis to solidify the slurry on the framework surface of the framework material, and after sintering and forming, the pores of the framework material correspond to the pores of the aluminum titanate-mullite composite ceramic, so that the aluminum titanate-mullite composite ceramic has high porosity.
Alumina and titanium dioxide in the raw materials react to generate an aluminum titanate crystal phase during high-temperature sintering, the balance of alumina and silicon dioxide react to generate a mullite crystal phase, the stabilizer enters the aluminum titanate crystal phase during sintering to be converted into stable components, and the stable components of magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide stabilize the generated aluminum titanate crystal phase to avoid the decomposition of the aluminum titanate crystal phase, so that the cracking of ceramics caused by the decomposition of the aluminum titanate crystal phase can be improved. The mullite powder is converted into a mullite crystal phase in the high-temperature sintering process, the mullite crystal phase and the aluminum titanate crystal are combined together, the pinning effect is achieved, and the mullite crystal phase has good strength, so that the strength of the ceramic is increased.
The weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 5-35: 0.1-10: 3-25: 50-90: 0.1-1, so that the mass ratio of the aluminum titanate crystal phase to the mullite crystal phase in the sintered and molded aluminum titanate-mullite composite ceramic is 6-7: 3-4. The mullite crystal phase can improve the strength of the ceramic, but the toughness of the mullite crystal phase is poor, and the applicant researches and discovers that the aluminum titanate-mullite composite ceramic has good strength and toughness when the aluminum titanate crystal phase and the mullite crystal phase in the aluminum titanate-mullite composite ceramic meet the condition that the mass ratio is 6-7: 3-4.
When the aluminum titanate-mullite composite ceramic has three-dimensional reticular pores, the aluminum titanate-mullite composite ceramic is very suitable for gas circulation when applied to a porous medium burner, and can improve the combustion efficiency; when the ceramic filter is applied to a ceramic filter, the larger specific surface area can increase the filtering effect.
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 an XRD pattern before and after water-cooling thermal shock of the aluminum titanate-mullite composite ceramic of example 1 of the present application;
FIG. 2 is an SEM photograph of the aluminum titanate-mullite composite ceramic in example 1 of the present application.
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.
Aluminum titanate ceramics are easily decomposed into alumina and titanium dioxide at medium-high temperature (800-1300 ℃), so that the thermal expansion coefficient is greatly increased, high thermal shock resistance is lost, the aluminum titanate ceramics are easy to break during sintering, and the sintering strength is low.
Based on the above, the embodiment of the application provides the aluminum titanate-mullite composite ceramic and the preparation method thereof, the porous medium burner and the ceramic filter, wherein the aluminum titanate-mullite composite ceramic has good sintering strength and toughness, and the problems of easy fracture and low sintering strength of the existing aluminum titanate ceramic during sintering are solved.
The following specifically describes the aluminum titanate-mullite composite ceramic, the preparation method thereof, the porous medium burner and the ceramic filter according to the embodiment of the present application:
in a first aspect, an embodiment of the present application provides an aluminum titanate-mullite composite ceramic, which includes an aluminum titanate crystalline phase and a mullite crystalline phase in a mass ratio of 6-7: 3-4; the stabilizing component of the aluminum titanate-mullite composite ceramic is at least one selected from magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide.
The stabilizing component is at least one of magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide, and the magnesium oxide, the ferric oxide and the like can be embedded into the aluminum titanate crystal phase in a solid solution mode to avoid the decomposition of the aluminum titanate crystal phase. The radius of the ions of strontium, yttrium, cerium, silicon, iron and lanthanum is equal to the radius of the Al ions, the strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide can enter the crystal lattice of aluminum titanate to replace the Al ions during sintering, and the compensation of charges is completed by the vacancy of oxygen, so that the effect of stabilizing the crystal phase of the aluminum titanate is achieved.
Wherein the stabilizing component is provided by a stabilizer in the raw material of the aluminum titanate-mullite composite ceramic, and illustratively, the stabilizer is selected from at least one of magnesium oxide, magnesite, magnesium carbonate, strontium carbonate, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide. These components themselves or after high-temperature sintering become corresponding oxides, thereby playing a role of stabilizing the components. Optionally, the particle size of the stabilizer is 0.5-2 μm. The granularity of the stabilizer in the embodiment of the application enables the aluminum titanate-mullite composite after sintering and forming to be more stable, and if the granularity is too fine, the shrinkage rate during sintering may be too large to affect the stability of the aluminum titanate-mullite composite. The particle size of the stabilizer D50 being 0.5 to 2 μm means that the proportion of the stabilizer having a particle size of 0.5 to 2 μm is 50% of the total mass of the stabilizer.
The stabilizing component of the embodiment of the application can stabilize the aluminum titanate crystal phase and avoid the decomposition of the aluminum titanate crystal phase, thereby improving the cracking of the ceramic caused by the decomposition of the aluminum titanate crystal phase. The mullite crystal phase can be combined with the aluminum titanate crystal, has a pinning effect, and has better strength and thermal shock resistance, so that the strength and the thermal shock resistance of the ceramic are improved. The mullite crystal phase can improve the mechanical property of the ceramic, and the research of the applicant finds that when the mullite crystal phase in the aluminum titanate-mullite composite ceramic is too small, the strength of the ceramic is not good enough, when the mullite crystal phase is too much, the strength of the ceramic is good, but the thermal shock resistance is reduced, and when the mass ratio of the aluminum titanate crystal phase to the mullite crystal phase in the aluminum titanate-mullite composite ceramic is 6-7: 3-4, the aluminum titanate-mullite composite ceramic has good strength and thermal shock resistance. Illustratively, the mass ratio of the aluminum titanate crystalline phase to the mullite crystalline phase is 6:4, 7:3, 2:1, or 7: 4.
In one possible embodiment, the mass ratio of the aluminum titanate crystalline phase to the mullite crystalline phase is 6: 4.
the applicant researches and discovers that when the mass ratio of the aluminum titanate crystal phase to the mullite crystal phase is 6:4, compared with other proportion ranges, the aluminum titanate-mullite composite ceramic has good strength and thermal shock resistance.
In a second aspect, an embodiment of the present application provides a method for preparing an aluminum titanate-mullite composite ceramic according to the embodiment of the first aspect, wherein the raw materials of the aluminum titanate-mullite composite ceramic include alumina, titania, silica, mullite powder, a dispersant, a binder, a stabilizer for stabilizing a crystalline phase of aluminum titanate, and a solvent for dissolving the binder; the weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 5-35: 0.1-10: 3-25: 50-90: 0.1 to 1.
The preparation method comprises the following steps: and (3) immersing the framework material with the three-dimensional net structure into the slurry of the raw materials to make the framework surface of the framework material coated with slurry, and then performing pyrolysis and sintering molding to decompose the framework material.
The adhesive in the raw materials can be dissolved in the solvent, the alumina, the silica, the titanium dioxide and the mullite powder are bonded together through the adhesive, and the dispersing agent can enable the alumina, the silica, the titanium dioxide and the mullite powder to be uniformly dispersed in the dissolved adhesive. The method comprises the steps of hanging slurry on the surface of a framework of the framework material, solidifying the slurry on the surface of the framework material by an adhesive during pyrolysis, decomposing the framework material after sintering and forming, and enabling the pores of the framework material to correspond to the pores of the aluminum titanate-mullite composite ceramic, so that the aluminum titanate-mullite composite ceramic has high porosity. The aluminum titanate crystal phase is stabilized by the stabilizing components such as magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide, and the aluminum titanate crystal phase is prevented from being decomposed.
The framework material can be selected from foamed plastic or a framework material with a three-dimensional net structure printed by using a 3D printing device through light-cured resin. The foam is optionally a polyurethane foam or a polystyrene foam. The polyurethane foam is optionally a soft foam, the pores of which are open-celled, and the pores of the corresponding aluminum titanate-mullite composite ceramic are also open-celled.
The weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 5-35: 0.1-10: 3-25: 50-90: 0.1-1, so that the mass ratio of the aluminum titanate crystal phase to the mullite crystal phase in the sintered and molded aluminum titanate-mullite composite ceramic is 6-7: 3-4, and the aluminum titanate-mullite composite ceramic has good strength and thermal shock resistance. Illustratively, the weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 8-30: 0.5-5: 5-15: 60-80: 0.2-0.8, 10-20: 1-6: 5-10: 60-70: 0.1-0.5 or 10-30: 1-10: 5-20: 50-70: 0.4 to 0.7.
Alternatively, the alumina comprises at least one of calcined alpha-alumina, activated alpha-alumina, gamma-alumina, aluminum hydroxide, industrial alumina, and corundum. Optionally, the silicon dioxide comprises amorphous SiO2And crystalline SiO2. Alternatively, the titanium dioxide includes at least one of anatase type, rutile type, and amorphous titanium dioxide. Optionally, the mullite comprises a combination of one or more of fused mullite and sintered mullite.
Illustratively, the particle size of the alumina is 0.5-5 μm, the particle size of the silica is 0.5-2 μm, and the particle size of the titania is 0.1-1 μm; the grain diameter of the mullite powder is D50 which is 0.5-10 mu m. The particle size distribution of the alumina, the silica, the titanium dioxide and the mullite powder meets the requirement of the particle size, so that the aluminum titanate-mullite composite after sintering and molding is more stable, and if the particle size is too fine, the shrinkage rate during sintering can be too large to influence the stability of the aluminum titanate-mullite composite.
In one possible embodiment, the ratio of the total mass of the alumina, the silica, the titanium dioxide, the mullite powder and the stabilizer to the mass of the binder, the solvent and the dispersant is 100:20 to 50:30 to 50:0.1 to 10. The alumina, the silica, the titanium dioxide, the mullite powder and the stabilizer are all powder, and the alumina, the silica, the titanium dioxide, the mullite powder, the stabilizer, the adhesive, the solvent and the dispersant meet the proportion, so that the slurry has proper viscosity, is easy to hang on the surface of a framework of the framework material, and cannot block pores of the framework material due to too thick slurry. Illustratively, the mass ratio of the total mass of the alumina, the silica, the titanium dioxide, the mullite powder and the stabilizer to the mass of the adhesive, the solvent and the dispersant is 100: 20-40: 40-50: 2-8; the mass ratio of the total mass of the alumina, the silica, the titanium dioxide, the mullite powder and the stabilizer to the mass of the adhesive, the solvent and the dispersant is 100: 30-50: 35-45: 4-7.
Optionally, the dispersant comprises a combination of one or more of terpineol, n-butanol, triton X-100, tween 20. Optionally, the binder comprises a combination of one or more of phenolic resin, epoxy resin, polyacrylic resin, polyvinyl butyral; the solvent is selected from one or more of ethanol, acetone and butanone.
In a possible embodiment, after the framework material is immersed in the slurry, the redundant slurry can be thrown off from the suspended framework material in a centrifugal mode, the slurry is uniformly blown by compressed air, and then the drying and curing are carried out, so that the probability that the slurry blocks the pores of the framework material is reduced. Optionally, the pressure of the compressed air is 0.3-0.6 MPa. The temperature for drying and curing may optionally be 50-150 deg.C, such as 50 deg.C, 70 deg.C, 90 deg.C, 110 deg.C, 130 deg.C or 150 deg.C.
It should be noted that the steps of slurry coating, centrifuging, blowing, drying and curing can be repeated until the slurry coated on the surface of the framework material 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 framework material to obtain a first volume, multiplying the first volume by the density of the adopted aluminum titanate to obtain a first weight, and dividing the weight of the hanging slurry by the first weight to obtain a target mass fraction; the weight of the glaze divided by the density of the aluminum titanate employed gives a second volume, which divided by the first volume is the target volume fraction.
Further, optionally, the pyrolysis temperature is 800-. Under the condition, the adhesive has sufficient curing time, and the framework material can be completely decomposed. Illustratively, the pyrolysis temperature is 800 ℃, 840 ℃, 870 ℃, 900 ℃, 940 ℃, 970 ℃ or 1000 ℃. Illustratively, the holding time for the pyrolysis process is in a range of any one or between any two of 60min, 120min, 180min, 240min, and 300 min.
Alternatively, the pyrolysis process is carried out under inert atmosphere or vacuum conditions. 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, so that the aluminum titanate-mullite ceramic blank after the pyrolysis process is higher in strength, and can be processed firstly and then sintered. In other embodiments, the pyrolysis process may also be carried out under an air or oxygen atmosphere.
Alternatively, the step of sintering and forming is performed in an air atmosphere or an oxygen atmosphere, and the pyrolysis process and the sintering process may be performed in the same sintering furnace, in which case the pyrolysis process is also performed in an air or oxygen atmosphere. The pyrolysis process and the sintering process may also be performed separately in different sintering furnaces.
Illustratively, the temperature for sintering and molding is 1500-. Under the condition, the aluminum titanate-mullite ceramic can be successfully prepared, and the crystal grains can be fully refined by the heat preservation time of 120-plus-one 360 min.
In a third aspect, embodiments of the present application provide a porous medium burner having the aluminum titanate-mullite composite ceramic of the first aspect therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
In a fourth aspect, embodiments of the present application provide a ceramic filter having the aluminum titanate-mullite composite ceramic of the first aspect therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
When the aluminum titanate-mullite composite ceramic has three-dimensional reticular pores, the aluminum titanate-mullite composite ceramic is very suitable for gas circulation when applied to a porous medium burner, and can improve the combustion efficiency; when the ceramic filter is applied to a ceramic filter, the larger specific surface area can increase the filtering effect.
The aluminum titanate-mullite composite ceramic of the present application, the method for preparing the same, the porous medium burner and the ceramic filter will be described in further detail with reference to examples.
Example 1
The embodiment of the application provides aluminum titanate-mullite composite ceramic which comprises the following raw materials: 3kg of fused mullite powder (D50 ═ 8 μm), calcined alpha-Al2O31kg of powder (D50 ═ 2 μm), 366g of fine silica powder (D50 ═ 0.5 μm), 1kg of anatase titanium dioxide (D50 ═ 0.3 μm), 60g of magnesium oxide powder (D50 ═ 0.5 μm), 4.6g of ferric oxide (analytically pure), 8g of lanthanum oxide (analytically pure), 1.5kg of phenolic resin, 10g of terpineol, 5g of n-butanol, 5g of triton X-100, 1500g of ethanol and 500g of butanone.
The preparation method of the aluminum titanate-mullite composite ceramic 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 290mmx140mmx20mm specifications, soaking the polyurethane sponge into the slurry, taking out the polyurethane sponge, centrifuging, throwing off redundant slurry, and blowing the slurry hung on a precursor uniformly by using compressed air, wherein the pressure of the compressed air is 0.5 MPa; placing the polyurethane sponge coated with the sizing agent in an oven, drying and curing at 120 ℃, and repeating the processes of sizing soaking, centrifuging, blowing, drying and curing to obtain an aluminum titanate-mullite foam precursor with the volume fraction of 25%; placing the aluminum titanate-mullite foam precursor in a vacuum degreasing furnace, and performing pyrolysis degreasing for 18 hours at 900 ℃; and after pyrolysis, placing the mixture in a high-temperature electric furnace, and sintering the mixture at 1600 ℃ for 5 hours in an air atmosphere to obtain the aluminum titanate-mullite composite ceramic.
Example 2
The embodiment of the application provides aluminum titanate-mullite composite ceramic which comprises the following raw materials: sintered mullite powder (D50 ═ 8 μm)2.5kg, active α -Al2O31.4kg of powder (D50 ═ 1 μm), 1.1kg of rutile titanium dioxide (D50 ═ 0.5 μm), 175g of magnesium carbonate, 50g of strontium carbonate, 5.8g of ferric oxide, 10g of lanthanum oxide, 1.6kg of phenolic resin, 10g of n-butanol, 20g of Tween 20, 1600g of ethanol and 400g of butanone.
The preparation method of the aluminum titanate-mullite composite ceramic comprises the following steps:
placing the raw materials in a ball milling tank, ball milling for 5 hours to prepare slurry, printing a framework material with the side length of 2mm square holes and the size of 140mmx100mmx25mm through 3D printing equipment, soaking the framework material into the slurry, taking out, centrifuging, throwing off redundant slurry, and uniformly blowing the slurry hung on a precursor by using compressed air, wherein the pressure of the compressed air is 0.3 MPa; placing the framework material coated with the slurry 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-mullite foam precursor with the volume fraction of 20%; placing the aluminum titanate-mullite foam precursor in a vacuum degreasing furnace, and setting the temperature at 800 ℃ for pyrolysis degreasing for 20 hours; and after pyrolysis, placing the mixture in a high-temperature electric furnace, and sintering the mixture at 1550 ℃ for 6 hours in an air atmosphere to obtain the aluminum titanate-mullite composite ceramic.
Test example 1
The aluminum titanate-mullite composite ceramics obtained in examples 1 and 2 were measured for porosity by the drainage method, and the results are shown in table 1.
TABLE 1 porosity of aluminum titanate-mullite composite ceramic
| Example 1 | Example 2 | |
| Porosity of the material | 80％ | 83％ |
As can be seen from the results of table 1, the aluminum titanate-mullite composite ceramics of examples 1 and 2 herein have higher porosity.
Test example 2
The aluminum titanate-mullite composite ceramics obtained in examples 1 to 2 were tested for compressive strength using a material universal tester, and the aluminum titanate-mullite composite ceramics obtained in examples 1 to 2 were tested for thermal shock resistance, which included the following steps: firstly heating a muffle furnace to 1400 ℃, then putting the aluminum titanate-mullite composite ceramic into the furnace, preserving heat for 5min, clamping the aluminum titanate-mullite composite ceramic out, putting the aluminum titanate-mullite composite ceramic into water, taking the aluminum titanate-mullite composite ceramic out of the furnace, drying the aluminum titanate-mullite composite ceramic out of the water, observing whether the aluminum titanate-mullite composite ceramic cracks or not by using a magnifying glass, and continuing the circulating water-cooling. The results are shown in Table 2.
TABLE 2 Normal temperature compressive strength and thermal shock resistance of aluminum titanate-mullite composite ceramic
And (3) testing results: the aluminum titanate-mullite composite ceramics of example 1 and example 2 did not crack after being water-cooled at 1400 ℃ and thermally shocked for 2 times. It is demonstrated that the aluminum titanate-mullite composite ceramics of examples 1 and 2 herein have excellent thermal shock resistance.
Test example 3
XRD tests were carried out on the aluminum titanate-Mullite composite ceramic obtained in example 1 before and after 3 times of water-cooling thermal shock, and the test patterns are shown in FIG. 1, in which AT represents the aluminum titanate crystal phase and Mullite represents the Mullite crystal phase. By analyzing in fig. 1, the mass ratio of the aluminum titanate crystal phase to the mullite crystal is 6:4, and the aluminum titanate-mullite composite ceramic of example 1 of the present application has no large change in crystal phase after water-cooling thermal shock.
Test example 4
The aluminum titanate-mullite composite ceramic of example 1 was subjected to water-cooling thermal shock for 3 times, and then observed by a scanning electron microscope, and the SEM image obtained was as shown in fig. 2.
As can be seen from the results of FIG. 2, the aluminum titanate-mullite composite ceramic of example 1 of the present application has no significant cracks after 3 times of water-cooling thermal shock, which indicates that it has good thermal shock resistance.
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-mullite composite ceramic is characterized by comprising an aluminum titanate crystal phase and a mullite crystal phase in a mass ratio of 6-7: 3-4, wherein a stable component of the aluminum titanate-mullite composite ceramic is selected from at least one of magnesium oxide, strontium oxide, silicon dioxide, ferric oxide, cerium oxide, lanthanum oxide and yttrium oxide.
2. The aluminum titanate-mullite composite ceramic according to claim 1, wherein the mass ratio of the aluminum titanate crystalline phase to the mullite crystalline phase is 6: 4.
3. the aluminum titanate-mullite composite ceramic according to claim 1 or 2, wherein the stabilizing element is provided by a stabilizer in a raw material of the aluminum titanate-mullite composite ceramic, and a particle size of the stabilizer is D50 ═ 0.5 to 2 μm.
4. A method for producing an aluminum titanate-mullite composite ceramic according to any one of claims 1 to 3, wherein raw materials of the aluminum titanate-mullite composite ceramic include alumina, titania, silica, mullite powder, a dispersant, a binder, a stabilizer for stabilizing an aluminum titanate crystal phase, and a solvent for dissolving the binder; the weight ratio of the alumina to the silica to the titanium dioxide to the mullite powder to the stabilizer is 5-35: 0.1-10: 3-25: 50-90: 0.1 to 1;
the preparation method comprises the following steps: and immersing the framework material with the three-dimensional net structure into the slurry of the raw materials to enable the framework surface of the framework material to be coated with slurry, then carrying out pyrolysis and sintering molding, and enabling the framework material to be decomposed.
5. The method for producing an aluminum titanate-mullite composite ceramic according to claim 4, wherein the alumina has a particle size of D50 ═ 0.5 to 5 μm, and the silica has a particle size of D50 ═ 0.5 to 2 μm; the particle size of the titanium dioxide is D50 ═ 0.1-1 mu m; the particle size of the mullite powder is D50-0.5-10 mu m.
6. The method of claim 4, wherein the stabilizer is at least one selected from the group consisting of magnesium oxide, magnesite, magnesium carbonate, strontium carbonate, iron oxide, cerium oxide, lanthanum oxide, and yttrium oxide.
7. The method of producing an aluminum titanate-mullite composite ceramic according to claim 4, wherein the ratio of the total mass of the alumina, the silica, the titania, the mullite powder and the stabilizer to the mass of the binder, the solvent and the dispersant is 100: 20-50: 30-50: 0.1-10.
8. The method for preparing an aluminum titanate-mullite composite ceramic according to any one of claims 4 to 7, wherein the pyrolysis temperature is 800 to 1000 ℃ and the holding time is 60 to 300 min; alternatively, the pyrolysis process is carried out under inert atmosphere or vacuum conditions.
9. A porous media burner comprising the aluminum titanate-mullite composite ceramic of any one of claims 1-3 therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
10. A ceramic filter comprising the aluminum titanate-mullite composite ceramic of any one of claims 1-3 therein, the aluminum titanate-mullite composite ceramic having a three-dimensional network of pores.
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