CN111875365A - Aluminum-silicon porous ceramic part for metal liquid purifier and preparation method thereof - Google Patents

Aluminum-silicon porous ceramic part for metal liquid purifier and preparation method thereof Download PDF

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CN111875365A
CN111875365A CN202010811789.4A CN202010811789A CN111875365A CN 111875365 A CN111875365 A CN 111875365A CN 202010811789 A CN202010811789 A CN 202010811789A CN 111875365 A CN111875365 A CN 111875365A
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component
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porous ceramic
powder
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马军强
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Luoyang Kechuang New Material Co ltd
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Luoyang Kechuang New Material Co ltd
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Abstract

An aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight: 1.0-50.0 parts of mullite particles, 35.0-84.0 parts of corundum particles, 0.5-6.0 parts of zirconium carbonate fine powder, 0.5-4.0 parts of quartz fine powder, 1.0-6.0 parts of alpha-alumina micro powder, 0.5-6.0 parts of chromium oxide green and 2.5-4.0 parts of resin bonding agent; the preparation method comprises the following steps: weighing zirconium carbonate, quartz, alpha-alumina and chromium oxide green according to a proportion, mixing, and spraying water mist to form microspheres; putting the mixed powder into a grinder, and introducing hot air to dry to obtain co-ground powder; weighing mullite and corundum particles according to a proportion, adding a resin bonding agent, and uniformly mixing to obtain aggregate; adding the co-ground powder into the aggregate, rolling and discharging, and pressing and forming; putting the mixture into a drying kiln for hot high-temperature sintering. The porous ceramic part prepared by the invention has good erosion resistance, erosion resistance and thermal shock resistance, is resistant to cleaning by an oxygen gun and has long service life.

Description

Aluminum-silicon porous ceramic part for metal liquid purifier and preparation method thereof
Technical Field
The invention relates to the technical field of porous ceramics, in particular to an aluminum-silicon porous ceramic part for a metal liquid purifier and a preparation method thereof.
Background
In the 21 st century, the general trend of development of metal materials such as iron, titanium, magnesium, aluminum, copper and the like is as follows: the method comprises the steps of firstly carrying out deep purification treatment on the metal liquid to obtain the ultra-pure metal liquid, and then carrying out micro-alloying treatment on the ultra-pure metal liquid to produce the metal material with ultra-performance so as to meet the requirements of national defense high-precision equipment. The metal liquid purifier is a very key functional gas supply element which is positioned at the bottom of a metal liquid refining container, and the purification principle is as follows: inert gas (such as argon) enters the porous ceramic part through the gas blowing pipe, the porous ceramic part decomposes the inert gas flow into bubbles with controllable quantity and size, and then the bubbles are sprayed into the metal liquid, and the bubbles can absorb harmful gas (such as hydrogen) in the metal liquid and carry non-metal impurities in the metal liquid to float upwards and remove the harmful gas, so that the aim of purifying the metal liquid is fulfilled; in addition, the temperature of the homogenized metal liquid can be accelerated through the stirring action of the bubbles, the micro-alloying of the metal liquid is accelerated, and the production efficiency is improved. At present, the porous ceramic parts for the metal liquid purifier on the market are mainly corundum-mullite ceramic matrix composite materials, and have the advantages of good thermal shock resistance, but the defects are also obvious: poor corrosion resistance, poor resistance to gun cleaning, low life span, and difficulty in matching the metal liquid container liner.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned deficiencies of the prior art, the present invention aims to provide an aluminum-silicon porous ceramic component for a metal liquid purifier and a preparation method thereof, and the prepared porous ceramic component has strong erosion resistance and erosion resistance, good thermal shock resistance, oxygen gun cleaning resistance and long service life.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight: 1.0-50.0 parts of mullite particles, 35.0-84.0 parts of corundum particles, 0.5-6.0 parts of zirconium carbonate fine powder, 0.5-4.0 parts of quartz fine powder, 1.0-6.0 parts of alpha-alumina micro powder, 0.5-6.0 parts of chromium oxide green and 2.5-4.0 parts of resin bonding agent.
Further, grains of the mullite grainsThe diameter is 3-0.5mm, and the mullite grains comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities.
Further, the grain diameter of the corundum particles is 3-0.5mm, and the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities.
Further, the particle size of the zirconium carbonate fine powder is 800 meshes, and the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities.
Further, the particle size of the quartz fine powder is 325 meshes, and the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance being impurities.
Further, the grain diameter of the alpha-alumina micro powder is 1-5 μm, and the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities.
Further, the particle size of the chromium oxide green is 2-4 μm, and the chromium oxide green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion of claim 1, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing mullite particles and corundum particles according to the proportion of claim 1, adding the mullite particles and the corundum particles into a high-speed mixing mill, adding a resin bonding agent after dry mixing for 2-5 min, mixing and milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
The invention has the beneficial effects that:
(1) the invention provides an aluminum-silicon porous ceramic mainly comprising mullite and corundum, wherein zirconium carbonate fine powder is added in the raw material, the raw material is heated and decomposed in a high-temperature kiln to be changed into zirconia, the thermal shock resistance of the porous ceramic is improved by utilizing the phase change toughening mechanism of the zirconia, and meanwhile, the high erosion resistance and the non-wetting characteristic of metal liquid of the zirconia are utilized to improve the erosion resistance of a porous ceramic part;
(2) the raw materials of the invention are added with chromium oxide green, and the chromium oxide, mullite and corundum form solid solution when being sintered at high temperature in a high-temperature kiln, so that the bonding strength of a ceramic matrix can be improved, and the metal liquid scouring resistance and the oxygen gun cleaning resistance of the ceramic matrix are obviously improved;
(3) according to the invention, the milling powder is added into the aggregate in the preparation process, and is uniformly dispersed through a high-speed constant-temperature mixing process, so that uniformly distributed and fine-sized pores are formed in the product in the use process, the elastic strain energy can be well absorbed and dissipated, the damage of thermal stress to the material is relieved, the thermal shock stability of the porous ceramic component is improved, and the spalling resistance and the erosion resistance of the porous ceramic component are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example 1:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight:
50.0 parts of mullite particles with the particle size of 3-0.5mm, wherein the mullite particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, and the particle size distribution of the mullite grains is as follows: the weight ratio of the mullite grains with the grain diameter of 3-1mm to the grain diameter of 1-0.5mm is 2: 3;
38.5 parts of corundum particles with the particle size of 3-0.5mm, wherein the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, wherein the grain size distribution of the corundum particles is as follows: the weight ratio of corundum particles with the particle size of 3-1mm to corundum particles with the particle size of 1-0.5mm is 1: 2.85;
0.5 part of zirconium carbonate fine powder with the particle size of 800 meshes, wherein the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities;
4.0 parts of quartz fine powder with the particle size of 325 meshes, wherein the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance of impurities;
1.0 part of alpha-alumina micro powder with the grain diameter of 1-5 mu m, wherein the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
6.0 parts of chromium oxide green with the particle size of 2-4 mu m, wherein the chromium oxide green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
3 parts of resin binder.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing the mullite particles and the corundum particles according to the proportion, adding the mullite particles and the corundum particles into a high-speed mixing mill, carrying out dry mixing for 2-5 min, adding a resin bonding agent, carrying out mixed milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
Example 2:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight:
1.0 part of mullite particles with the particle size of 3-1mm, wherein the mullite particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities;
84.0 parts of corundum particles with the particle size of 3-1mm, wherein the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, wherein the grain size distribution of the corundum particles is as follows: the weight ratio of corundum particles with the particle size of 3-1mm to corundum particles with the particle size of 1-0.5mm is 1: 32;
6.0 parts of zirconium carbonate fine powder with the particle size of 800 meshes, wherein the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O≤0.2%，The balance being impurities;
0.5 part of quartz fine powder with the particle size of 325 meshes, wherein the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance of impurities;
6.0 parts of alpha-alumina micro powder with the particle size of 1-5 microns, wherein the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
0.5 part of chromium oxide green with the particle size of 2-4 mu m, wherein the chromium oxide green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
4.0 parts of resin binder.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing mullite particles and corundum particles according to the proportion, adding the mullite particles and the corundum particles into a high-speed mixing mill, adding a resin binder after dry mixing for 2-5 min, mixing and milling for 2-3 min, uniformly mixing to obtain aggregate, and spraying an anti-erosion coating on the surface of the aggregate, wherein the anti-erosion coating is a solution formed by one or more selected from carbide, nitride, silicide and boride and the resin binder, and further, the thickness of the anti-erosion coating is 0.1-0.3 mm;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, baking for 5 hours at the temperature of 25-60 ℃ at the kiln inlet, 60-110 ℃ for 6 hours at the temperature of 110-200 ℃, baking for 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature to 1700-1800 ℃ under the reducing atmosphere, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
Further, in step S4, the waste products from the press forming process may be crushed in a crusher and then put into a grinder of step S2 to form a co-ground powder together with the new ground material; in the step S5, unqualified products are manually picked out of the kiln, and are put into a crusher to be crushed and then put into a high-temperature kiln to be sintered together with the newly-fired raw materials; the two steps can avoid raw material waste, and the raw material sintering cannot be influenced due to the unchanged raw material proportion, so that the cost can be saved to a certain extent.
Example 3:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight:
50.0 parts of mullite particles with the particle size of 3-0.5mm, wherein the mullite particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, and the particle size distribution of the mullite grains is as follows: the weight ratio of the mullite grains with the grain diameter of 3-1mm to the grain diameter of 1-0.5mm is 1: 4;
35.0 parts of corundum particles with the particle size of 3-0.4mm, wherein the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, wherein the grain size distribution of the corundum particles is as follows: particle sizeThe weight ratio of corundum particles with the particle size of 1-0.5mm to corundum particles with the particle size of 3-1mm is 1: 2.5;
5 parts of zirconium carbonate fine powder with the particle size of 800 meshes, wherein the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities;
4.0 parts of quartz fine powder with the particle size of 325 meshes, wherein the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance of impurities;
3.0 parts of alpha-alumina micro powder with the particle size of 3 mu m, wherein the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
4.0 parts of chromium oxide green with the particle size of 2-4 mu m, wherein the chromium oxide green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
3.6 parts of resin binder.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing the mullite particles and the corundum particles according to the proportion, adding the mullite particles and the corundum particles into a high-speed mixing mill, carrying out dry mixing for 2-5 min, adding a resin bonding agent, carrying out mixed milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
Example 4:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight:
20.0 parts of mullite particles with the particle size of 3-1mm, wherein the mullite particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities;
68.0 parts of corundum particles with the particle size of 1-0.5mm, wherein the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities;
4.0 parts of zirconium carbonate fine powder with the particle size of 800 meshes, wherein the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities;
2.0 parts of quartz fine powder with the particle size of 325 meshes, wherein the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance of impurities;
3.0 parts of alpha-alumina micro powder with the particle size of 3 mu m, wherein the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
3.0 parts of chromium oxide green with the particle size of 2-4 mu m, wherein the chromium oxide green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
3.2 parts of resin binder.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing the mullite particles and the corundum particles according to the proportion, adding the mullite particles and the corundum particles into a high-speed mixing mill, carrying out dry mixing for 2-5 min, adding a resin bonding agent, carrying out mixed milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
Example 5:
an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following components in parts by weight:
10.0 parts of mullite particles with the particle size of 3-1mm, wherein the mullite particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities;
80.0 parts of corundum particles with the particle size of 3-0.5mm, wherein the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities, wherein the grain size distribution of the corundum particles is as follows: the weight ratio of corundum particles with the particle size of 3-1mm to corundum particles with the particle size of 1-0.5mm is 1: 7;
1.0 part of zirconium carbonate fine powder with the particle size of 800 meshes, wherein the zirconium carbonate fine powder comprises the following chemical components in percentage by mass: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities;
1.0 part of quartz fine powder with the particle size of 325 meshes, wherein the quartz fine powder comprises the following chemical components in percentage by mass: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance of impurities;
3.0 parts of alpha-alumina micro powder with the particle size of 3 mu m, wherein the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
5.0 parts of chromium oxide green with the particle size of 2-4 mu m, wherein the chromium oxideThe green comprises the following chemical components in percentage by mass: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities;
and 2.5 parts of resin binder.
A preparation method of an aluminum-silicon porous ceramic part for a metal liquid purifier comprises the following specific steps:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing the mullite particles and the corundum particles according to the proportion, adding the mullite particles and the corundum particles into a high-speed mixing mill, carrying out dry mixing for 2-5 min, adding a resin bonding agent, carrying out mixed milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
Further, in step S2, the temperature of the introduced hot air is 110 to 150 ℃.
According to the aluminum-silicon porous ceramic part for the metal liquid purifier, the zirconium carbonate fine powder is added into the raw material and is heated and decomposed in the high-temperature kiln to be changed into zirconium oxide, the thermal shock resistance of the porous ceramic is improved by utilizing the phase change toughening mechanism of the zirconium oxide, and meanwhile, the corrosion resistance of the porous ceramic part is improved by utilizing the high corrosion resistance and the characteristic that the zirconium oxide is not soaked by metal liquid; chromium oxide green is also added, and when the chromium oxide green is sintered at high temperature in a high-temperature kiln, the chromium oxide, mullite and corundum form a solid solution, so that the bonding strength of a ceramic matrix can be improved, and the metal liquid scouring resistance and the oxygen gun cleaning resistance of the ceramic matrix are obviously improved;
in the preparation process of the aluminum-silicon porous ceramic part for the metal liquid purifier, the milling powder is added into the aggregate, and the high-speed constant-temperature milling process is adopted to uniformly disperse the aggregate, so that the product forms uniformly-distributed pores with fine sizes in the use process, elastic strain energy can be well absorbed and dissipated, the damage of thermal stress to the material is relieved, the thermal shock stability of the porous ceramic part is improved, and the spalling resistance and the erosion resistance of the porous ceramic part are improved. The main physical and chemical indexes of the prepared porous ceramic component are as follows: al (Al)2O3≥87.0%、SiO2≤4.0%、ZrO20.2-2.4%、Cr2O30.5-6.0%, and volume density of 2.6-2.9 g/cm after sintering at 1750 deg.C3The apparent porosity is 25.0-35.0%, and the compressive strength is more than or equal to 60.0 MPa; the strength is high, the thermal shock resistance, the erosion resistance and the oxygen gun cleaning resistance are realized in the using process, the service life is prolonged by 5-10 percent compared with the traditional corundum-mullite porous ceramic component, and the economic benefit is obvious.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. An aluminum-silicon porous ceramic part for a metal liquid purifier is characterized by comprising the following components in parts by weight: 1.0-50.0 parts of mullite particles, 35.0-84.0 parts of corundum particles, 0.5-6.0 parts of zirconium carbonate fine powder, 0.5-4.0 parts of quartz fine powder, 1.0-6.0 parts of alpha-alumina micro powder, 0.5-6.0 parts of chromium oxide green and 2.5-4.0 parts of resin bonding agent.
2. The aluminum-silicon porous ceramic component for a metal liquid purifier as claimed in claim 1, wherein the mullite grains have a grain size of 3-0.5mm, and the mullite grains have a chemical composition, in mass percent, of: component A: al (Al)2O3Not less than 70.0%, component B: SiO 22≤30.0%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities.
3. The aluminum-silicon porous ceramic component for a metal liquid purifier according to claim 1, wherein the corundum particles have a particle size of 3-0.5mm, and the corundum particles comprise the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.3 percent, and the balance is impurities.
4. The aluminum-silicon porous ceramic member for a metallic liquid purifier as claimed in claim 1, wherein the zirconium carbonate fine powder has a particle size of 800 mesh, and the zirconium carbonate fine powder has a chemical composition, in mass percent, of: component A: zr (CO)3)2Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.2 percent, and the balance is impurities.
5. The aluminum-silicon porous ceramic member for a metallic liquid purifier as claimed in claim 1, wherein the fine quartz powder has a particle size of 325 mesh, and the fine quartz powder has a chemical composition, in mass percent, of: component A: SiO 22Not less than 99.0%, component B: al (Al)2O3≤0.3%、Fe2O3Less than or equal to 0.1 percent, and the balance being impurities.
6. The aluminum-silicon-based porous ceramic for metallic liquid purifiers according to claim 1The part is characterized in that the grain diameter of the alpha-alumina micro powder is 1-5 μm, and the alpha-alumina micro powder comprises the following chemical components in percentage by mass: component A: al (Al)2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities.
7. The aluminum-silicon porous ceramic component for a metal liquid purifier as claimed in claim 1, wherein the chromium oxide green has a particle size of 2 to 4 μm, and the chromium oxide green has a chemical composition, in mass percent, of: component A: cr (chromium) component2O3Not less than 99.0%, component B: SiO 22≤0.1%、Fe2O3≤0.1%、Na2O+K2O is less than or equal to 0.1 percent, and the balance is impurities.
8. The method for producing an aluminum-silicon porous ceramic member for a metallic liquid purifier according to any one of claims 1 to 7, comprising the steps of:
s1, weighing and mixing zirconium carbonate fine powder, quartz fine powder, alpha-alumina micro powder and chromium oxide green according to the proportion in claim 1, and spraying water mist in the mixing process to form microspheres;
s2, putting the mixed powder of S1 into a grinder for co-grinding, introducing hot air in the co-grinding process, drying and grinding simultaneously, and uniformly mixing to obtain co-ground powder;
s3, weighing mullite particles and corundum particles according to the proportion in claim 1, adding the mullite particles and the corundum particles into a high-speed mixing mill, carrying out dry mixing for 2-5 min, adding a resin bonding agent, carrying out mixed milling for 2-3 min, and uniformly mixing to obtain aggregate;
s4, adding the co-ground powder into the aggregate obtained in the step S3, rolling for 10-30min, discharging, ageing for 1 hour, then pressing and molding by using a 800-ton hydraulic press, and standing for 12 hours to obtain a semi-finished product;
s5, placing the semi-finished product obtained in the step S4 into a drying kiln for heat treatment for 24 hours, wherein the temperature of a kiln inlet is 25-60 ℃, the baking time is 5 hours, the temperature is 60-110 ℃, the baking time is 6 hours, the temperature is 110-200 ℃, the baking time is 13 hours, placing a kiln car into a high-temperature kiln, setting the temperature at 1700-1800 ℃, preserving the heat for 5 hours, and taking out of the kiln for sorting to obtain the porous ceramic component for the metal liquid purifier.
9. The method of claim 8, wherein the temperature of the hot air introduced in step S2 is 110 to 150 ℃.
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JP2009013057A (en) * 2007-07-09 2009-01-22 Robert Bosch Gmbh Method for manufacturing ceramic body having functionalized pore surface
CN103964862A (en) * 2013-02-06 2014-08-06 济南圣泉倍进陶瓷过滤器有限公司 Ceramic filter and preparation method thereof
CN104261848A (en) * 2014-09-23 2015-01-07 郑州瑞泰耐火科技有限公司 Chrome-oxide-containing mullite brick and preparation method thereof
CN108610088A (en) * 2018-06-04 2018-10-02 武汉科技大学 A kind of alumina-mullite porous heat-insulating ceramics and preparation method thereof
CN108997001A (en) * 2018-08-05 2018-12-14 洛阳科创新材料股份有限公司 A kind of preparation method of air brick micropore ceramics stick

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009013057A (en) * 2007-07-09 2009-01-22 Robert Bosch Gmbh Method for manufacturing ceramic body having functionalized pore surface
CN103964862A (en) * 2013-02-06 2014-08-06 济南圣泉倍进陶瓷过滤器有限公司 Ceramic filter and preparation method thereof
CN104261848A (en) * 2014-09-23 2015-01-07 郑州瑞泰耐火科技有限公司 Chrome-oxide-containing mullite brick and preparation method thereof
CN108610088A (en) * 2018-06-04 2018-10-02 武汉科技大学 A kind of alumina-mullite porous heat-insulating ceramics and preparation method thereof
CN108997001A (en) * 2018-08-05 2018-12-14 洛阳科创新材料股份有限公司 A kind of preparation method of air brick micropore ceramics stick

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