CN106146034B - A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of material - Google Patents
A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of material Download PDFInfo
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Abstract
The present invention relates to a kind of porous mullite-corundum to load perovskite La1‑xKxCo0.7Fe0.3O3The preparation method of (x=0.2~0.8), using bauxite and diatomite as raw material, using wet milling, filtering, drying, stirring and binder, dispersing agent, foam stabilizer and foaming agent, then is formed, dried and sintering prepares porous mullite-corundum material；Then it uses the method for vacuum impregnation and calcining by perovskite supported on porous mullite-corundum carrier again, prepares porous mullite-corundum load perovskite La1‑xKxCo0.7Fe0.3O3Material.The present invention has the characteristics that simple process, with short production cycle, high-efficient, stable product quality, at low cost, production can prepare porous mullite-corundum load perovskite La on demand1‑ xKxCo0.7Fe0.3O3Material has preferable industrial utilization prospect.
Description
Technical field
The present invention relates to a kind of preparation methods of porous mullite-corundum material, and in particular to one kind is with bauxite and silicon
Diatomaceous earth is that raw material prepares porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The method of material.
Background technique
Porous ceramics is a kind of inorganic non-metallic material containing increased number of stomata, has porosity height, permeability height, corrosion resistant
The small excellent characteristics such as low with thermal conductivity of erosion, large specific surface area, bulk density, be widely used in metallurgy, chemical industry, environmental protection, the energy,
The every field such as food, pharmacy, biology, as filtering, separation, gas distribution, sound-absorbing, heat-insulated, chemical filler, bioceramic and catalysis
The materials'uses such as agent carrier, the concern because of its new green environment protection, increasingly by field scientific research personnel.
Currently, preparing there are mainly three types of the methods of porous ceramics, including chemical method, Polymeric sponge method and foam method.
Chemical method refers to adds some substances that bubble can be generated by chemical reaction in blank, and chemical reaction is borrowed to generate gas,
Product is set to obtain stomata.Polymeric sponge method is done using the foam impregnation with reticular structure in ceramic slurry
Organic matter is removed through sintering after dry, obtains porous ceramics, preparation process includes preparing organic ink, selecting suitable organic bubble
Foam, the pretreatment of foam, dipping, hanging, sintering.Foaming is that foaming agent is introduced into slurry, passes through mechanical means
Processing generates bubble, and then cure pastes, obtain porous body, finally re-sinter to obtain porous ceramics.Wherein, prepared by chemical method
Porous ceramic articles are swift in response, and the bubble generated is not easy to control；Polymeric sponge method simple process, commonly used to preparation
High porosity and porous ceramics with through-hole structure, still, when calcining, the heating rate of low-temperature space must be very slow, and
Organic formwork is also easy to produce slag when burning-off removes, and causes environmental pollution, and ceramic frame is easy cracking, can significantly reduce last pottery
The mechanical strength of ceramic products；And foaming is small with generation bubble, porosity is high, hole shape and size are controllable, production cost
The advantages that low and simple process.
Summary of the invention
A kind of porous mullite-corundum ceramic method, this method are prepared the technical problem to be solved by the present invention is providing
Have the characteristics that simple process, with short production cycle, high-efficient, stable product quality, at low cost, can produce on demand prepare it is porous not
Carry out stone-corundum ceramic material, there is preferable industrial utilization prospect.
In order to solve the above technical problems, the invention is realized by the following technical scheme:
The preparation method for designing a kind of porous mullite-corundum ceramic, includes the following steps:
(1) according to mullite-corundum ceramics to Al2O3、SiO2Component requirements, weigh a certain proportion of bauxite and silicon
Diatomaceous earth carries out 6~12h of continuous wet-grinding, then is filtered, dries, grinds after mixing the two, obtain mixed-powder；Wherein, institute
The ratio of bauxite and diatomite is stated so that Al in mixed-powder2O3With SiO2Molar ratio reach subject to 2.5~5:1；
(2) suitable quantity of water (1.0~1.5 times) are added into the mixed-powder, after stirring 10~30min, are added described mixed
Close the starch of 4~6wt% of powder, the Triammonium citrate of 0.4~0.6wt%, 0.05~0.20wt% sodium carboxymethylcellulose and
The silicone resin polyethers lotion (50~60wt% of solid content) of 0.05~0.20wt%, adds the mixed-powder after mixing evenly
The lauryl sodium sulfate of 0.5~1.0wt% stirs 2~6min, until obtaining casting after uniform and stable foamed slurry, so
Afterwards, it is demoulded after keeping the temperature 10~60min under the conditions of molding foamed slurry being placed in 40~70 DEG C, obtains green body；
(3) heat preservation 6 under the conditions of the green body being placed in 110~140 DEG C~for 24 hours, after natural cooling, then it is placed in 1300~
It is sintered at 1400 DEG C, obtains porous mullite-corundum ceramic；Be sintered temperature increasing schedule are as follows: room temperature to 600 DEG C, heating rate is 2~
5℃•min-1；600~1000 DEG C, heating rate is 5~8 DEG C of min-1, and 30~60min is kept the temperature at 1000 DEG C；1000℃
More than, heating rate is 3~5 DEG C of min-1, finally keep the temperature 2~6h.
The present invention has following positive beneficial effect:
(1) present invention employs pore-creating prepares porous mullite-corundum ceramic with the foaming new process that combines:
On the one hand this method has given full play to the porous ceramics that pore creating material prepares even pore distribution, another unilaterally to have played hair again
The high feature of the porosity of bubble method preparation ceramics, while characteristic of the diatomite material with natural porous is made full use of, to make
Not only hole is evenly distributed the ceramics prepared, and has the characteristics that the porosity is high.
(2) the method for the present invention overcomes chemical method bore hole size and gas release is uppity compared with existing chemical method
Defect；Compared with simple foaming, the quantity of connection stomata can be effectively controlled as needed；With Polymeric sponge method phase
Than the ceramics mechanical strength with higher prepared.That is, the ceramics of the method for the present invention preparation have distribution of pores equal
The features such as even, connection stomatal number amount is effectively controlled and improves Mechanical Property of Ceramics.
(3) raw material sources of the present invention are extensive, cheap；Designed process is simple to operate,
Safety, equipment is few, and investment is small, is easy production of founding the factory；Products obtained therefrom is with short production cycle, with high purity, quality is stablized, at low cost, can
Production on demand.
(4) porous mullite-corundum material that the method for the present invention is prepared is with creep rate is low, thermal expansion coefficient is small, anti-
The advantages that thermal shock resistance is good, in melted metal filtering, gas purification separation, heat exchanger, heat-insulation and heat-preservation, catalyst carrier, film branch
The fields such as support body, which have, to be widely applied.
Detailed description of the invention
FIG. 1 to FIG. 4 is followed successively by the porous mullite-corundum load for the different batches prepared with the embodiment of the present invention 1~4
Perovskite La1-xKxCo0.7Fe0.3O3The XRD spectrum of material.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is further explained.Test method in following embodiments, such as nothing are especially said
It is bright, it is conventional method.Test material and reagent as used in the following examples are purchased from conventional chemical unless otherwise instructed
Reagent shop, diatomite used contain SiO2It is 85wt%, bauxite contain Al2O3It is 90wt%。
Embodiment 1
A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of (x=0.2) material,
The following steps are included:
1) porous mullite-corundum material preparation: 320 grams of bauxite (2.825 moles of Al are weighed respectively2O3) and 80
Gram diatomite (1.132 moles of SiO2) be put into grinding machine after continuous wet-grinding 12h, slurry is filtered to obtain filter cake, is filtered
Cake, which is placed in grind after drying in 110 DEG C of baking ovens, obtains mixed-powder, and mixed-powder is placed in container and adds the water (weight of water and powder
Amount is than being 1.2:1) stirring 30min, it is subsequently added into 20g starch, 2.0g Triammonium citrate, 0.4g sodium carboxymethylcellulose and 0.6g
Silicone resin polyethers lotion (solid content 55wt%) adds 4g lauryl sodium sulfate after mixing evenly, stirs 6min, obtains
Then molding foamed slurry is placed in baking oven after 40 DEG C of heat preservation 60min by casting after even stable foamed slurry, take off
Mould obtains cured foam green body and is placed in 110 DEG C of baking ovens to keep the temperature for 24 hours, and natural cooling is placed in electric furnace to be kept the temperature at 1400 DEG C
4h is sintered temperature increasing schedule are as follows: for room temperature to 600 DEG C, heating rate is 2 DEG C of min-1；600~1000 DEG C, heating rate is 5 DEG C
min-1, and 60min is kept the temperature at 1000 DEG C；1000~1400 DEG C, heating rate is 3 DEG C of min-1, soaking time 4h.Then
Cooled to room temperature obtains porous mullite-corundum material.
2) porous mullite-corundum loads perovskite La1-xKxCo0.7Fe0.3O3The preparation of material: according to La1- xKxCo0.7Fe0.3O3Metallic element stoichiometric ratio (La:K:Co:Fe=0.8:0.2:0.7:0.3) in (x=0.2) material, respectively
It takes in each 90.5,22.6,79.2 and 34.0ml merging container of lanthanum nitrate, strontium nitrate, cobalt nitrate, the iron nitrate solution of 0.2mol/L
After ultrasonic disperse 5min, KOH and K are added dropwise dropwise in the dispersion process of stirring and ultrasound2CO3Mixed solution (0.30molL-1
KOH solution and concentration be 0.15molL-1K2CO3Solution volume ratio be 2:1), pH value control between 10~11, then
By stirring and obtaining precursor solution after ultrasonic disperse 20min；Before porous mullite-corundum material after drying is impregnated into
It drives in liquid solution, is placed in vacuum instrument, vacuumize to be put into after pressure maintaining 3h in drying box and be tried after dry 3h at 75 DEG C
Sample C；Finally sample C is placed in electric furnace and passes through 700 DEG C of calcining 3h, after cooled to room temperature, by calcined product distilled water
It is washed repeatedly to neutrality, porous mullite-corundum load perovskite La is obtained after drying1-xKxCo0.7Fe0.3O3Material.Gained is negative
Carry perovskite La1-xKxCo0.7Fe0.3O3Porous mullite-corundum material XRD of (x=0.2) is shown in Fig. 1.
Embodiment 2
A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of (x=0.8) material,
The following steps are included:
1) porous mullite-corundum material preparation: 332 grams of bauxite (2.930 moles of Al are weighed respectively2O3) and
69 grams of diatomite (0.976 mole of SiO2) be put into grinding machine after continuous wet-grinding 6h, slurry is filtered to obtain filter cake, is filtered
Cake, which is placed in grind after drying in 110 DEG C of baking ovens, obtains mixed-powder, and mixed-powder is placed in container and adds the water (weight of water and powder
Amount is than being 1.2:1) stirring 10min, it is subsequently added into 20g starch, 2.0g Triammonium citrate, 0.2g sodium carboxymethylcellulose and 0.8g
Silicone resin polyethers lotion (solid content 55wt%) is stirring evenly and then adding into 4.0g lauryl sodium sulfate, stirs 4min, obtains
Then molding foamed slurry is placed in baking oven in 70 DEG C after keeping the temperature 10min by casting after even stable foamed slurry,
Demoulding obtains cured foam green body and is placed in 140 DEG C of baking ovens to keep the temperature 6h, and natural cooling is placed in electric furnace protects at 1400 DEG C
Warm 2h is sintered temperature increasing schedule are as follows: for room temperature to 600 DEG C, heating rate is 5 DEG C of min-1；600~1000 DEG C, heating rate 8
℃•min-1, and 30min is kept the temperature at 1000 DEG C；1000~1400 DEG C, heating rate is 5 DEG C of min-1, soaking time 2h；
Then cooled to room temperature obtains porous mullite-corundum material.
2) porous mullite-corundum loads perovskite La1-xKxCo0.7Fe0.3O3The preparation of material: according to La1- xKxCo0.7Fe0.3O3Metallic element stoichiometric ratio (La:K:Co:Fe=0.2:0.8:0.7:0.3) in (x=0.8) material, respectively
It takes in each 22.8,91.3,79.9 and 34.2ml merging container of lanthanum nitrate, strontium nitrate, cobalt nitrate, the iron nitrate solution of 0.3mol/L
After ultrasonic disperse 5min, KOH and K are added dropwise dropwise in the dispersion process of stirring and ultrasound2CO3Mixed solution (0.30molL-1
KOH solution and concentration be 0.15molL-1K2CO3Solution volume ratio be 2:1), pH value control between 10~11, then
By stirring and obtaining precursor solution after ultrasonic disperse 20min；Before porous mullite-corundum material after drying is impregnated into
It drives in liquid solution, is placed in vacuum instrument, vacuumize to be put into after pressure maintaining 3h in drying box and be tried after dry 3h at 75 DEG C
Sample C；Finally sample C is placed in electric furnace and passes through 700 DEG C of calcining 6h, after cooled to room temperature, by calcined product distilled water
It is washed repeatedly to neutrality, porous mullite-corundum load perovskite La is obtained after drying1-xKxCo0.7Fe0.3O3Material.Gained is negative
Carry perovskite La1-xKxCo0.7Fe0.3O3Porous mullite-corundum material XRD of (x=0.8) is shown in Fig. 2.
Embodiment 3
A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of (x=0.4) material,
The following steps are included:
1) porous mullite-corundum material preparation: 259 grams of bauxite (2.286 moles of Al are weighed respectively2O3) and
40.5 grams of diatomite (0.573 mole of SiO2) be put into grinding machine after continuous wet-grinding 11h, slurry is filtered and is filtered
Cake, filter cake, which is placed in grind after drying in 110 DEG C of baking ovens, obtains mixed-powder, and mixed-powder is placed in container and adds water (water and powder
The weight ratio at end is 1.3:1) stirring 30min, it is subsequently added into 15g starch, 1.5g Triammonium citrate, 0.6g sodium carboxymethylcellulose
With 0.2g silicone resin polyethers lotion (solid content 55wt%), it is stirring evenly and then adding into 2.5g lauryl sodium sulfate, stirs 5min,
Casting after uniform and stable foamed slurry is obtained, then molding foamed slurry is placed in baking oven in 40 DEG C and is kept the temperature
After 50min, demoulding obtains cured foam green body and is placed in 110 DEG C of baking ovens to keep the temperature 20h, and natural cooling is placed in electric furnace
2h is kept the temperature at 1400 DEG C, is sintered temperature increasing schedule are as follows: for room temperature to 600 DEG C, heating rate is 4 DEG C of min-1；It 600~1000 DEG C, rises
Warm rate is 6 DEG C of min-1, and 50min is kept the temperature at 1000 DEG C；1000~1400 DEG C, heating rate is 4 DEG C of min-1, heat preservation
Time is 2h；Then after cooled to room temperature, porous mullite-corundum material is obtained.
2) porous mullite-corundum loads perovskite La1-xKxCo0.7Fe0.3O3The preparation of material: according to La1- xKxCo0.7Fe0.3O3Metallic element stoichiometric ratio (La:K:Co:Fe=0.6:0.4:0.7:0.3) in (x=0.4) material, respectively
Each 102.7,68.47,119.8 and 51.4ml merging of lanthanum nitrate, strontium nitrate, cobalt nitrate, the iron nitrate solution of 0.2mol/L is taken to hold
In device after ultrasonic disperse 5min, KOH and K are added dropwise dropwise in the dispersion process of stirring and ultrasound2CO3Mixed solution
(0.30molL-1KOH solution and concentration be 0.15molL-1K2CO3Solution volume ratio be 2:1), pH value control
Between 10 ~ 11, using stirring and ultrasonic disperse 20min after obtain precursor solution；By porous mullite-corundum after drying
Material is impregnated into precursor solution, is placed in vacuum instrument, is vacuumized to be put into after pressure maintaining 3h in drying box and be done at 75 DEG C
Sample C is obtained after dry 3h；Finally sample C is placed in electric furnace and passes through 800 DEG C of calcining 2h, after cooled to room temperature, will be calcined
Obtained sample is washed with distilled water repeatedly to neutrality, and porous mullite-corundum load perovskite La is obtained after drying1- xKxCo0.7Fe0.3O3Material.Gained loads perovskite La1-xKxCo0.7Fe0.3O3Porous mullite-the corundum material of (x=0.4)
XRD is shown in Fig. 3.
Embodiment 4
A kind of porous mullite-corundum load perovskite La1-xKxCo0.7Fe0.3O3The preparation method of (x=0.6) material,
The following steps are included:
1) porous mullite-corundum material preparation: 178 grams of bauxite (1.571 moles of Al are weighed respectively2O3) and
22.2 grams of diatomite (0.314 mole of SiO2) be put into grinding machine after continuous wet-grinding 10h, slurry is filtered and is filtered
Cake, filter cake, which is placed in grind after drying in 110 DEG C of baking ovens, obtains mixed-powder, and mixed-powder is placed in container and adds water (water and powder
The weight ratio at end is 1.5:1) stirring 10min, it is subsequently added into 10g starch, 1.0g Triammonium citrate, 0.1g sodium carboxymethylcellulose
With 0.4g silicone resin polyethers lotion (solid content 55wt%), it is stirring evenly and then adding into 1.5g lauryl sodium sulfate, stirs 4min,
Casting after uniform and stable foamed slurry is obtained, then molding foamed slurry is placed in baking oven in 60 DEG C and is kept the temperature
After 20min, demoulding obtains cured foam green body and is placed in 120 DEG C of baking ovens to keep the temperature 12h, and natural cooling is placed in electric furnace
3h is kept the temperature at 1300 DEG C, is sintered temperature increasing schedule are as follows: for room temperature to 600 DEG C, heating rate is 4 DEG C of min-1；It 600~1000 DEG C, rises
Warm rate is 5 DEG C of min-1, and 40min is kept the temperature at 1000 DEG C；1000~1300 DEG C, heating rate is 3 DEG C of min-1, heat preservation
Time is 3h；After cooled to room temperature, porous mullite-corundum material is obtained.
2) porous mullite-corundum loads perovskite La1-xKxCo0.7Fe0.3O3The preparation of material: according to La1- xKxCo0.7Fe0.3O3Metallic element stoichiometric ratio (La:K:Co:Fe=0.4:0.6:0.7:0.3) in (x=0.6) material, respectively
Each 68.47,102.7,119.8 and 51.4ml merging of lanthanum nitrate, strontium nitrate, cobalt nitrate, the iron nitrate solution of 0.2mol/L is taken to hold
In device after ultrasonic disperse 5min, KOH and K are added dropwise dropwise in the dispersion process of stirring and ultrasound2CO3Mixed solution
(0.30molL-1KOH solution and concentration be 0.15molL-1K2CO3Solution volume ratio be 2:1), pH value control
Between 10~11, using stirring and ultrasonic disperse 20min after obtain precursor solution；Porous mullite-after drying is rigid
Beautiful material is impregnated into precursor solution, is placed in vacuum instrument, is put into drying box at 75 DEG C after vacuumizing pressure maintaining 3h
Sample C is obtained after dry 3h；Finally sample C is placed in electric furnace and passes through 800 DEG C of calcining 2h, after cooled to room temperature, will be forged
It burns obtained sample to be washed repeatedly with distilled water to neutrality, porous mullite-corundum load perovskite La is obtained after drying1- xKxCo0.7Fe0.3O3Material.Gained loads perovskite La1-xKxCo0.7Fe0.3O3Porous mullite-the corundum material of (x=0.6)
XRD is shown in Fig. 4.
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.
Claims (10)
1. a kind of porous mullite-corundum loads perovskite La1-xKxCo0.7Fe0.3O3The preparation method of material, which is characterized in that
Include the following steps:
(1) according to mullite-corundum ceramics to Al2O3、SiO2Component requirements, weigh a certain proportion of bauxite and diatomite,
6~12h of continuous wet-grinding after the two is mixed, then be filtered, dry, grind, obtain mixed-powder；
(2) suitable quantity of water is added into the mixed-powder, after stirring 10~30min, adds the 4~6wt%'s of mixed-powder
Starch, the Triammonium citrate of 0.4~0.6wt%, the sodium carboxymethylcellulose of 0.05~0.20wt% and 0.05~0.20wt% silicon
Resin polyethers lotion, adds the lauryl sodium sulfate of the 0.5~1.0wt% of mixed-powder after mixing evenly, and stirring 2~
Then molding foamed slurry, is placed in 40~70 DEG C of conditions until obtaining casting after uniform and stable foamed slurry by 6min
It is demoulded after 10~60min of lower heat preservation, obtains green body；
(3) under the conditions of the green body being placed in 110~140 DEG C heat preservation 6~for 24 hours, after natural cooling, then be placed in 1300~1400 DEG C
Lower sintering obtains porous mullite-corundum material A；
(4) lanthanum nitrate, potassium nitrate, cobalt nitrate and the iron nitrate solution of 0.2~0.3mol/L are prepared respectively, and according to perovskite
La1-xKxCo0.7Fe0.3O3The stoichiometric ratio requirement of middle metallic element, is mixed, then dispersed according to a certain volume
5min, while KOH and K is slowly added dropwise2CO3Mixed solution, until pH value be 10~11, carry out dispersion 20min, obtain presoma
Solution B；
(5) porous mullite-corundum material A obtained by step (3) is impregnated into precursor solution B obtained by step (4), is placed in
Pressure maintaining 3h under vacuum condition, dry 3h, obtains sample C at 75 DEG C；It is natural by sample C in 700~800 DEG C of 2~6h of calcining
After being cooled to room temperature, calcined product addition distilled water is washed to neutrality repeatedly, then is dried to get porous mullite-is arrived
Corundum loads perovskite La1-xKxCo0.7Fe0.3O3Material.
2. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the perovskite La1-xKxCo0.7Fe0.3O3In, x=0.2~0.8.
3. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the ratio of bauxite described in step (1) and diatomite is so that Al in mixed-powder2O3With SiO2Mole
Than reaching subject to 2.5~5:1.
4. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the dosage of water described in step (2) is 1.0~1.5 times of the mixed-powder weight.
5. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the solid content of silicone resin polyethers lotion described in step (2) is 50~60wt%.
6. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: starch described in step (2), Triammonium citrate additional amount be followed successively by the mixed-powder 5wt%,
0.5wt%。
7. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the temperature increasing schedule of step (3) described sintering are as follows: for room temperature to 600 DEG C, heating rate is 2~5 DEG C of min-1；
600~1000 DEG C, heating rate is 5~8 DEG C of min-1, and 30~60min is kept the temperature at 1000 DEG C；1000 DEG C or more, heating speed
Rate is 3~5 DEG C of min-1, finally keep the temperature 2~6h.
8. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: the volume ratio that step (4) lanthanum nitrate, potassium nitrate, cobalt nitrate and iron nitrate solution are mixed, with
Make the molar ratio 0.4:0.6:0.7:0.3 of La, K, Co, Fe.
9. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: step (4) KOH and K2CO3Mixed solution by 0.30molL-1KOH solution and
0.15mol·L-1K2CO3Solution is mixed with volume ratio 2:1.
10. porous mullite-corundum loads perovskite La according to claim 11-xKxCo0.7Fe0.3O3The preparation side of material
Method, it is characterised in that: step (4) dispersing mode is ultrasound and stirring while carrying out.
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| CN103145444A (en) * | 2013-03-28 | 2013-06-12 | 中国科学技术大学 | Method for preparing heat-insulation lightweight porous mullite ceramic at low cost |
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| CN103145444A (en) * | 2013-03-28 | 2013-06-12 | 中国科学技术大学 | Method for preparing heat-insulation lightweight porous mullite ceramic at low cost |
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