CN108298964B - High-purity fine-grain wear-resistant alumina lining plate and preparation method thereof - Google Patents
High-purity fine-grain wear-resistant alumina lining plate and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of alumina ceramics in inorganic non-metallic materials, and particularly relates to a high-purity fine-grain wear-resistant alumina lining plate and a preparation method thereof. Mixing and sanding alpha-phase alumina A and alpha-phase alumina B, spraying, granulating, molding and sintering to obtain a high-purity fine-grain wear-resistant alumina lining plate; wet grinding, mixing and refining pseudo-boehmite, silica sol and industrial alumina to obtain fine particle mixed slurry passing through a 600-mesh screen, and performing filter pressing, flash evaporation, drying and calcination to obtain alpha-phase alumina A; and (3) carrying out dry mixing ball milling and refining on magnesium fluoride, boric acid and high-temperature calcined alumina to obtain fine particle powder passing through a 180-mesh screen, and calcining to obtain alpha-phase alumina B. The invention obtains the grain size bimodal distribution in the microstructure, and has a small amount of non-equiaxed crystals, thereby improving the hardness and the wear resistance of the alumina lining plate; the invention also provides a preparation method thereof, which has simple and convenient process, easy control of process parameters and stable batch production.
Description
Technical Field
The invention belongs to the field of alumina ceramics in inorganic non-metallic materials, and particularly relates to a high-purity fine-grain wear-resistant alumina lining plate and a preparation method thereof.
Background
In the fields of metallurgy, mine, electric power, chemical industry and the like, a conveying belt is needed to convey hard mineral raw materials, materials are often conveyed on the conveying belt through an oil-containing nylon plate or a polymer lining plate in the past, but due to poor wear resistance, material blockage often occurs, the lining plate needs to be replaced, the maintenance cost is increased, and the effect is reduced. Subsequently, cast iron has been used as a wear-resistant lining plate, and although the wear resistance is greatly improved, the problem of wear resistance of hard materials has not been solved. Therefore, the use of high hardness alumina ceramics as the wear resistant lining plate is an inevitable choice.
At present, two methods are adopted for improving the wear resistance of the lining plate, one method is to add hard materials into a high-molecular lining plate, for example, Chinese patent with application number of CN201110399222.1 discloses an impact-resistant wear-resistant lining plate and a preparation method thereof, wherein the impact-resistant wear-resistant lining plate adopts 40-55 parts of ultra-high molecular weight polyethylene, 5-10 parts of medium-density polyethylene, 5-10 parts of low-density polyethylene, 3-5 parts of superfine aluminum hydroxide, 20-30 parts of diatomite, 8-10 parts of vinyltriethoxysilane, 0.5-1.5 parts of benzoic acid and 0.3-0.5 part of dicumyl peroxide. The materials in the formula are stirred uniformly at a high speed and then are hot-pressed and molded on a hot press. The prepared impact-resistant wear-resistant lining plate keeps the characteristics of processability and low cost of the ultrahigh molecular material, but has insufficient wear resistance of hard minerals. The Chinese patent of application No. CN101182193 discloses a cyclone wear-resistant ceramic lining plate and a preparation method thereof, wherein the cyclone wear-resistant ceramic lining plate is prepared from the following raw materials in percentage by weight: 2 to 8 percent of yttrium oxide, 2 to 10 percent of alumina, 14 to 20 percent of carbon fiber and 65 to 80 percent of silicon carbide. The ceramic lining plate is added with rare earth materials such as aluminum oxide, yttrium oxide and the like, and low-temperature yttrium aluminum oxide is formed in the sintering process, so that the silicon carbide lining plate is compact, and the porosity of the product is reduced; meanwhile, the characteristic of high brittleness of silicon carbide is considered, carbon fibers are added into the raw materials, and the phenomena of crack propagation deflection, fiber pulling-out and the like can be caused by the presence of the carbon fibers, so that the fracture toughness of the product is improved. However, the patent does not give performance indexes such as fracture toughness, and only says that the service life of the part is greatly prolonged. Meanwhile, carbon fibers are expensive, and sintering dense ceramics such as silicon carbide requires higher sintering temperature and pressure, such as hot-press sintering, which not only increases the manufacturing cost of the lining plate, but also limits the size and shape of the lining plate.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-purity fine-grain wear-resistant alumina lining plate, which obtains bimodal distribution of grain size in a microstructure, has a small amount of non-equiaxed grains, and has high hardness and wear resistance; the invention also provides a preparation method thereof, which has simple and convenient process, easy control of process parameters and stable batch production.
The high-purity fine-grain wear-resistant alumina lining plate is prepared by mixing and sanding alpha-phase alumina A and alpha-phase alumina B, spraying, granulating, molding and sintering;
wherein: the preparation method of the alpha-phase alumina A comprises the following steps: wet grinding, mixing and refining pseudo-boehmite, silica sol and industrial alumina to obtain fine particle mixed slurry passing through a 600-mesh screen, and performing filter pressing, flash evaporation, drying and calcination to obtain alpha-phase alumina A;
the preparation method of the alpha-phase alumina B comprises the following steps: and (3) carrying out dry mixing ball milling and refining on magnesium fluoride, boric acid and high-temperature calcined alumina to obtain fine particle powder passing through a 180-mesh screen, and calcining to obtain alpha-phase alumina B.
Wherein:
the mass ratio of the alpha-phase alumina A to the alpha-phase alumina B is 3: 1 to 1: 3.
the addition amount of the pseudo-boehmite is 3-10% of the mass fraction of the industrial alumina, the addition amount of the silica sol is 0.1-0.4% of the mass fraction of the industrial alumina, and the mass fraction of the silica sol is 10-20%.
The addition amount of the magnesium fluoride is 0.1 to 0.3 percent of the weight fraction of the high-temperature calcined alumina, and the addition amount of the boric acid is 0.4 to 0.8 percent of the weight fraction of the high-temperature calcined alumina.
In the preparation method of the alpha-phase alumina A, the calcining temperature is 800-1100 ℃, and the calcining time is 2-10 hours; the obtained alpha-phase alumina A has the particle size distribution of D500.6 to 1.8 μm.
In the preparation method of the alpha-phase alumina B, the calcining temperature is 1100-1300 ℃, and the calcining time is 2-10 hours; the particle size distribution of the obtained alpha-phase alumina B is D502 to 3 μm.
The industrial alumina contains impurities with the total mass fraction not more than 1 percent, and the high-temperature calcined alumina contains impurities with the total mass fraction not more than 2.0 percent.
The grain size of the high-purity fine-grain wear-resistant alumina lining plate is in bimodal distribution in the microstructure.
The preparation method of the high-purity fine-grain wear-resistant alumina lining plate comprises the following steps:
(1) wet grinding, mixing and refining pseudo-boehmite, silica sol and industrial alumina to obtain fine particle mixed slurry passing through a 600-mesh screen;
(2) carrying out filter pressing, flash evaporation drying and calcination on the fine particle mixed slurry prepared in the step (1), and carrying out phase change on industrial alumina to generate alpha-phase alumina A;
(3) dry-mixing, ball-milling and refining magnesium fluoride, boric acid and high-temperature calcined alumina to obtain fine particle powder passing through a 180-mesh screen;
(4) calcining the fine particle powder prepared in the step (3) to obtain alpha-phase alumina B;
(5) mixing the alpha-phase alumina A obtained in the step (2) and the alpha-phase alumina B obtained in the step (4), sanding, and performing spray granulation to obtain alumina granulation powder;
(6) molding to obtain a biscuit of the alumina lining plate;
(7) sintering to obtain the high-purity wear-resistant alumina lining plate.
The sand mill control slurry D in the step (5)50Below 2 microns.
As a preferable technical scheme, the preparation method of the high-purity fine-grain wear-resistant alumina lining plate comprises the following steps:
firstly, adding industrial alumina into a roller ball mill, adding pseudo-boehmite with the mass fraction of the industrial alumina being 3-10%, adding silica sol with the mass fraction of the industrial alumina being 0.1-0.4% and the industrial alumina, carrying out wet grinding and mixing, and refining the materials to obtain fine particle mixed slurry capable of passing through a 600-mesh screen; the mass fraction of the silica sol is 10-20%;
secondly, performing filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining the powder for 2-10 hours at 800-1100 ℃, and enabling industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the particle size distribution D50 is 0.6-1.8 microns;
thirdly, selecting commercially available high-temperature calcined alumina, adding the alumina into a roller ball mill, adding magnesium fluoride accounting for 0.1-0.3% of the mass fraction of the high-temperature calcined alumina and boric acid accounting for 0.4-0.8% of the mass fraction of the high-temperature calcined alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 2 to 10 hours at the temperature of 1100 to 1300 ℃, removing sodium impurities in the powder sold in the market, and enabling the alumina crystal grains to completely develop to obtain alpha-phase alumina B with the particle size distribution of D502-3 microns;
fifthly, according to the mass ratio of A to B, from 3: 1 to 1: 3, mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be more than 2 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the high-purity fine-grain wear-resistant alumina lining plate.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides a high-purity fine-grain wear-resistant alumina lining plate sintered at a lower temperature, which adopts low-cost industrial-grade different types of alumina as raw materials, and alpha-phase alumina with different grain size distributions and phase transformation degrees is obtained by changing the pre-sintering and ball-milling treatment processes of different raw materials; the grain size bimodal distribution is obtained in the microstructure, and a small amount of non-isometric crystals exist, so that the hardness and the wear resistance of the alumina lining plate can be improved.
(2) The invention adopts two raw materials of industrial alumina and high-temperature calcined alumina, further removes impurities and improves the phase inversion degree of the alumina through a calcination process, and lays a foundation for microstructure regulation and control; the wear-resistant alumina lining plate is formed and sintered by adopting two processed raw materials with different primary grain sizes, so that microstructures with different grain size distributions are obtained, a small amount of columnar crystals appear, and the hardness and the wear resistance of the alumina ceramic are improved.
(3) The physical and chemical indexes of the finished product high-purity fine-grain wear-resistant alumina lining plate prepared by the invention are as follows:
the sodium mass fraction is lower than 0.1%;
the grain size in the microstructure is in bimodal distribution, and two peak distributions exist between the grain size of the lining plate under 1.6 microns and 2-4 microns;
the purity of the alumina ceramic lining plate obtained by sintering is more than 99 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is more than 15 GPa;
the wear resistance index is as follows: fracture toughness > 3.3 MP.m1/2。
(4) The invention also provides a preparation method thereof, which has simple and convenient process, easy control of process parameters and stable batch production.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Firstly, adding industrial alumina into a roller ball mill, adding pseudo-boehmite with the total mass fraction of 3% of alumina and silica sol with the mass fraction of 16% of 0.2% of alumina into the roller ball mill, wet-grinding, mixing and refining the materials together with the industrial alumina to obtain fine particle mixed slurry capable of passing through a 600-mesh screen;
secondly, carrying out filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining for 4 hours at 900 ℃ to enable industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the grain size distribution is D50 and is 1.0 micron;
thirdly, adding commercial high-temperature calcined alumina into a roller ball mill, adding magnesium fluoride accounting for 0.2 percent of the total mass fraction of the alumina and boric acid accounting for 0.6 percent of the total mass fraction of the alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 4 hours at 1200 ℃, removing sodium impurities in the powder sold in the market, and enabling alumina grains to completely develop to obtain alpha-phase alumina B with the particle size distribution D50 of 2.6 microns;
fifthly, according to the mass ratio of A to B of 1: 1 mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be larger than 1.8 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the fine-grain high-purity alumina wear-resistant lining plate.
The physical and chemical indexes of the wear-resistant alumina lining plate prepared by the method are as follows:
sodium mass fraction 0.08%;
the grain size of the lining plate has two peak value distributions at 1.5 microns and 3.1 microns;
the purity of the alumina ceramic lining plate obtained by sintering is 99.2 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is 15.6 GPa;
the wear resistance index is as follows:
fracture toughness > 3.4 MP.m1/2。
Example 2
Firstly, adding industrial alumina into a roller ball mill, adding pseudo-boehmite with the total mass fraction of the alumina being 6 percent and silica sol with the mass fraction being 18 percent and 0.3 percent into the roller ball mill, carrying out wet grinding and mixing with the industrial alumina, and refining the materials to obtain fine particle mixed slurry which can pass through a 600-mesh screen;
secondly, carrying out filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining for 4 hours at 1100 ℃, and enabling industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the grain size distribution is D50 and is 1.5 microns;
thirdly, adding commercial high-temperature calcined alumina into a roller ball mill, adding magnesium fluoride accounting for 0.1 percent of the total mass fraction of the alumina and boric acid accounting for 0.8 percent of the total mass fraction of the alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 4 hours at 1300 ℃, removing sodium impurities in the powder sold in the market, and enabling alumina grains to completely develop to obtain alpha-phase alumina B with the particle size distribution D50 of 3.0 microns;
fifthly, according to the mass ratio of A to B of 1: 1 mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be larger than 1.8 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the fine-grain high-purity alumina wear-resistant lining plate.
The physical and chemical indexes of the wear-resistant alumina lining plate prepared by the method are as follows:
sodium mass fraction 0.06%;
the grain size of the lining plate has two peak value distributions at 1.8 microns and 3.5 microns;
the purity of the alumina ceramic lining plate obtained by sintering is 99.5 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is 16.0 GPa;
the wear resistance index is as follows:
fracture toughness > 3.6 MP.m1/2。
Example 3
Firstly, adding industrial alumina into a roller ball mill, adding pseudo-boehmite with the total mass fraction of 10% of alumina and silica sol with the mass fraction of 20% of 0.1% of alumina into the roller ball mill, wet-grinding, mixing and refining the materials together with the industrial alumina to obtain fine particle mixed slurry capable of passing through a 600-mesh screen;
secondly, carrying out filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining for 4 hours at 800 ℃ to enable industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the grain size distribution is D50 to be 0.6 microns;
thirdly, adding commercial high-temperature calcined alumina into a roller ball mill, adding magnesium fluoride accounting for 0.3 percent of the total mass fraction of the alumina and boric acid accounting for 0.4 percent of the total mass fraction of the alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 4 hours at 1100 ℃, removing sodium impurities in the powder sold in the market, and enabling alumina grains to completely develop to obtain alpha-phase alumina B with the particle size distribution D50 of 2.5 microns;
fifthly, according to the mass ratio of A to B of 2: 1 mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be larger than 1.8 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the fine-grain high-purity alumina wear-resistant lining plate.
The physical and chemical indexes of the wear-resistant alumina lining plate prepared by the method are as follows:
sodium mass fraction 0.06%;
the grain size of the lining plate has two peak value distributions at 1.0 micron and 3.0 micron;
the purity of the alumina ceramic lining plate obtained by sintering is 99.1 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is 15.5 GPa;
the wear resistance index is as follows:
fracture toughness > 3.3 MP.m1/2。
Example 4
Firstly, adding industrial alumina into a roller ball mill, adding pseudo-boehmite with the total mass fraction of the alumina being 8 percent and silica sol with the mass fraction being 15 percent and 0.3 percent of the industrial alumina into the roller ball mill, wet-grinding, mixing and refining the materials to obtain fine particle mixed slurry which can pass through a 600-mesh screen;
secondly, carrying out filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining for 4 hours at 1000 ℃ to enable industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the grain size distribution is D50 and is 1.2 microns;
thirdly, adding commercial high-temperature calcined alumina into a roller ball mill, adding magnesium fluoride accounting for 0.2 percent of the total mass fraction of the alumina and boric acid accounting for 0.5 percent of the total mass fraction of the alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 4 hours at 1200 ℃, removing sodium impurities in the powder sold in the market, and enabling alumina grains to completely develop to obtain alpha-phase alumina B with the particle size distribution D50 of 2.6 microns;
fifthly, according to the mass ratio of A to B of 1: 2 mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be larger than 1.8 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the fine-grain high-purity alumina wear-resistant lining plate.
The physical and chemical indexes of the wear-resistant alumina lining plate prepared by the method are as follows:
sodium mass fraction 0.08%;
the grain size of the lining plate has two peak value distributions at 1.5 microns and 3.2 microns;
the purity of the alumina ceramic lining plate obtained by sintering is 99.0 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is 16.0 GPa;
the wear resistance index is as follows:
fracture toughness > 3.3 MP.m1/2。
Example 5
Firstly, adding industrial alumina into a roller ball mill, adding 7% of pseudo-boehmite of the total mass fraction of the alumina and 0.2% of silica sol of which the mass fraction is 18% into the roller ball mill, carrying out wet grinding and mixing with the industrial alumina, and refining the materials to obtain fine particle mixed slurry capable of passing through a 600-mesh screen;
secondly, carrying out filter pressing and flash evaporation drying on the fine particle mixed slurry prepared in the first step to obtain dry powder, calcining for 4 hours at 1000 ℃ to enable industrial alumina to generate phase change to generate fine-grain alpha-phase alumina A, wherein the grain size distribution is D50 and is 1.3 microns;
thirdly, adding commercial high-temperature calcined alumina into a roller ball mill, adding magnesium fluoride accounting for 0.3 percent of the total mass fraction of the alumina and boric acid accounting for 0.6 percent of the total mass fraction of the alumina, dry-mixing, ball-milling and refining the materials to obtain fine particle powder capable of passing through a 180-mesh screen;
fourthly, calcining the fine particle powder prepared in the third step for 4 hours at 1100 ℃, removing sodium impurities in the powder sold in the market, and enabling alumina grains to completely develop to obtain alpha-phase alumina B with the particle size distribution D50 of 2.4 microns;
fifthly, according to the mass ratio of A to B of 1: 3 mixing the two materials, sanding the mixture by a sand mill, controlling the slurry D50 not to be larger than 1.8 microns, and then carrying out spray granulation to obtain the alumina granulated powder.
Sixthly, molding the granulated powder prepared in the third step in a mold to obtain a biscuit of the alumina lining plate;
and seventhly, sintering the biscuit at the lower temperature of 1450-1550 ℃ to obtain the fine-grain high-purity alumina wear-resistant lining plate.
The physical and chemical indexes of the wear-resistant alumina lining plate prepared by the method are as follows:
sodium mass fraction 0.08%;
the grain size of the lining plate has two peak value distributions at 1.6 microns and 2.8 microns;
the purity of the alumina ceramic lining plate obtained by sintering is 99.1 percent;
the Vickers hardness HV5 of the alumina ceramic lining plate is 16.1 GPa;
the wear resistance index is as follows:
fracture toughness > 3.6 MP.m1/2。
The alumina wear-resistant lining plate manufactured by the embodiment has the characteristics of high hardness and good wear resistance.
Claims (7)
1. The utility model provides a wear-resisting alumina welt of high-purity fine grain which characterized in that: mixing and sanding alpha-phase alumina A and alpha-phase alumina B, spraying, granulating, molding and sintering to obtain a high-purity fine-grain wear-resistant alumina lining plate;
wherein: the preparation method of the alpha-phase alumina A comprises the following steps: wet grinding, mixing and refining pseudo-boehmite, silica sol and industrial alumina to obtain fine particle mixed slurry passing through a 600-mesh screen, and performing filter pressing, flash evaporation, drying and calcination to obtain alpha-phase alumina A;
the preparation method of the alpha-phase alumina B comprises the following steps: carrying out dry mixing ball milling and refining on magnesium fluoride, boric acid and high-temperature calcined alumina to obtain fine particle powder passing through a 180-mesh screen, and calcining to obtain alpha-phase alumina B;
in the preparation method of the alpha-phase alumina A, the calcining temperature is 800-1100 ℃, and the calcining time is 2-10 hours; the particle size distribution of the obtained alpha-phase alumina A is D50 which is 0.6-1.8 microns;
in the preparation method of the alpha-phase alumina B, the calcining temperature is 1100-1300 ℃, and the calcining time is 2-10 hours; the particle size distribution of the obtained alpha-phase alumina B is D50 of 2-3 microns;
the grain size of the high-purity fine-grain wear-resistant alumina lining plate is in bimodal distribution in the microstructure.
2. The high purity fine grain wear resistant alumina liner plate of claim 1 wherein: the mass ratio of the alpha-phase alumina A to the alpha-phase alumina B is 3: 1 to 1: 3.
3. the high purity fine grain wear resistant alumina liner plate of claim 1 wherein: the addition amount of the pseudo-boehmite is 3-10% of the mass fraction of the industrial alumina, the addition amount of the silica sol is 0.1-0.4% of the mass fraction of the industrial alumina, and the mass fraction of the silica sol is 10-20%.
4. The high purity fine grain wear resistant alumina liner plate of claim 1 wherein: the addition amount of the magnesium fluoride is 0.1 to 0.3 percent of the weight fraction of the high-temperature calcined alumina, and the addition amount of the boric acid is 0.4 to 0.8 percent of the weight fraction of the high-temperature calcined alumina.
5. The high purity fine grain wear resistant alumina liner plate of claim 1 wherein: the industrial alumina contains impurities with the total mass fraction not more than 1 percent, and the high-temperature calcined alumina contains impurities with the total mass fraction not more than 2.0 percent.
6. A method of making the high purity fine grain wear resistant alumina liner plate of any one of claims 1 to 5, wherein: the method comprises the following steps:
(1) wet grinding, mixing and refining pseudo-boehmite, silica sol and industrial alumina to obtain fine particle mixed slurry passing through a 600-mesh screen;
(2) carrying out filter pressing, flash evaporation drying and calcination on the fine particle mixed slurry prepared in the step (1), and carrying out phase change on industrial alumina to generate alpha-phase alumina A;
(3) dry-mixing, ball-milling and refining magnesium fluoride, boric acid and high-temperature calcined alumina to obtain fine particle powder passing through a 180-mesh screen;
(4) calcining the fine particle powder prepared in the step (3) to obtain alpha-phase alumina B;
(5) mixing the alpha-phase alumina A obtained in the step (2) and the alpha-phase alumina B obtained in the step (4), sanding, and performing spray granulation to obtain alumina granulation powder;
(6) molding to obtain a biscuit of the alumina lining plate;
(7) sintering to obtain the high-purity wear-resistant alumina lining plate.
7. The method of making a high purity fine grain wear resistant alumina liner plate of claim 6 wherein: and (5) controlling the slurry D50 to be below 2 microns by sand grinding.
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| WO2002081403A1 (en) * | 2001-04-09 | 2002-10-17 | The Morgan Crucible Company Plc. | High temperature resistant ceramic sintered material, method for the production and use thereof |
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