CN112028655A - Preparation method of mold bottom brick for high-temperature alloy ingot mold - Google Patents
Preparation method of mold bottom brick for high-temperature alloy ingot mold Download PDFInfo
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- CN112028655A CN112028655A CN202010972807.7A CN202010972807A CN112028655A CN 112028655 A CN112028655 A CN 112028655A CN 202010972807 A CN202010972807 A CN 202010972807A CN 112028655 A CN112028655 A CN 112028655A
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- 239000011449 brick Substances 0.000 title claims abstract description 95
- 239000000956 alloy Substances 0.000 title claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 45
- 238000000576 coating method Methods 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000007731 hot pressing Methods 0.000 claims abstract description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910000464 lead oxide Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- -1 silicon amide Chemical class 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000498 ball milling Methods 0.000 claims description 3
- 235000011837 pasties Nutrition 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 229910000601 superalloy Inorganic materials 0.000 claims 1
- 229910001067 superalloy steel Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 239000011819 refractory material Substances 0.000 abstract description 6
- 230000003749 cleanliness Effects 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5072—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with oxides or hydroxides not covered by C04B41/5025
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a preparation method of a mold bottom brick for a high-temperature alloy steel ingot mold. The mold bottom brick is uniformly coated with a coating with the thickness of 0.5-1 mm, and the preparation method of the mold bottom brick comprises the following steps: (1) preparing a die bottom brick and coating on the die bottom brick; (2) and uniformly coating the prepared coating on the use surface of the die bottom brick, putting the die bottom brick coated with the coating with the use surface facing upwards in a heating furnace for baking, and drying to obtain a finished die bottom brick. The die bottom brick is prepared by hot pressing of fine powder particles, and has strong shock resistance and good heat and corrosion resistance; the coating is prepared from powder particles with the particle size of less than 1 mu m, the coating is smoother and more compact, the brick at the bottom of the mould is more resistant to molten steel impact due to the use of the coating, the refractory material is not easily washed by the molten steel, and the brick is not easily stuck in the demoulding process; compared with the traditional mold bottom brick, the strength of the prepared mold bottom brick is greatly improved, and the cleanliness of the cast high-temperature alloy is higher.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a preparation method of a mold bottom brick for a high-temperature alloy steel ingot mold.
Background
The high-temperature alloy refers to an alloy which can work for a long time under the environment of high temperature above 600 ℃ and a certain stress action. The high-temperature alloy is widely applied to fields of aeroengines, automobile engines, gas turbines, nuclear power, petrochemical industry and the like by virtue of excellent oxidation resistance and thermal corrosion resistance. China is currently vigorously developing the aerospace industry and striving to independently research and develop internationally advanced aerospace engines. The demand of China on high-end high-temperature alloy will gradually increase. In order to improve the quality of high-temperature alloy products and optimize various performance indexes of high-temperature alloy materials, a great deal of effort is made by a plurality of metallurgists. The mold bottom brick is taken as a part which is directly contacted with molten steel in the smelting and casting process of the vacuum induction furnace, and the performance condition of the mold bottom brick is worth attention.
The mould bottom brick used for vacuum induction smelting of high-temperature alloy is a lining brick at the lower part of an ingot mould. Molten steel can be directly poured to the upper part of the die bottom brick during pouring, so that various performance indexes of the die bottom brick can have certain influence on the quality of the smelted high-temperature alloy. At present, the surface layer of the traditional mold bottom brick is easy to wash, refractory materials washed down can enter molten steel to pollute the molten steel, and the brick sticking phenomenon can also occur during demolding, so that troubles are brought to the subsequent treatment of steel ingots. Because of the above problems, it is imperative to find a mold bottom brick and a refractory coating having excellent properties.
Disclosure of Invention
Aiming at the technical defects, the invention provides a preparation method of a mold bottom brick for a high-temperature alloy ingot mold. Compared with the traditional mold bottom brick, the mold bottom brick prepared by the invention has the advantages that the strength is greatly improved, the molten steel scouring and hot corrosion can be effectively resisted, the steel ingot quality can be improved, the cleanliness of high-temperature alloy cast by the mold bottom brick and the coating is higher, and the high-temperature alloy quality is effectively improved.
In order to solve the defects of the prior art, the invention adopts the following technical scheme: a preparation method of a mold bottom brick for a high-temperature alloy ingot mold is characterized in that a coating with the thickness of 0.5-1 mm is uniformly coated on the mold bottom brick, and the preparation method specifically comprises the following steps:
(1) preparing a die bottom brick and coating on the die bottom brick;
(2) and uniformly coating the prepared coating on the use surface of the die bottom brick, putting the die bottom brick coated with the coating with the use surface facing upwards in a heating furnace for baking, and drying to obtain a finished die bottom brick.
The die bottom brick is made of corundum-mullite and comprises the following components in parts by mass: white corundum: 30-40%, fused mullite: 30% -35%, alumina: 25% -30%, bonding clay: 4 to 5 percent.
The preparation method of the mold bottom brick comprises the following steps: putting the white corundum, the fused mullite, the alumina powder and the combined clay into a ball mill for ball milling until the particle size of the powder is less than 5 mu m, and putting the powder into a die for hot press molding to obtain the corundum-mullite die bottom brick.
The hot pressing temperature during hot pressing molding is 1350-1400 ℃, the pressure is 30-40 MPa, and the heat preservation time is 1-2 h.
The tolerance of the outer diameter of the corundum-mullite mold bottom brick is +/-1 mm, and the tolerance of the height of the corundum-mullite mold bottom brick is +/-0.5 mm.
The coating is a mixture of lead oxide, silicon amide and carbon, the raw materials are respectively ground into powder with the particle size smaller than 1 mu m by using a ball mill, the three kinds of powder and water are mixed according to the mass ratio of 1:1, the mixture is uniformly mixed and then placed in a heating furnace for drying, and the coating is taken out for later use when the coating is pasty.
The coating comprises the following raw materials in percentage by mass: lead oxide: 60% -65%, silicon amide: 30% -35%, carbon: 4 to 6 percent.
Compared with the prior art, the invention has the following advantages:
(1) the die bottom brick is prepared by hot pressing of fine powder particles, has strong shock resistance and good heat and corrosion resistance, is different from the firing in a tunnel kiln, and has stricter size and smoother surface.
(2) The coating is prepared from powder particles smaller than 1 mu m, is finer and smoother, is more compact, and can make the brick at the bottom of the mould more resistant to molten steel impact, difficult to be washed by molten steel to form refractory materials and difficult to stick to the brick in the demoulding process.
(3) Compared with the traditional mold bottom brick, the mold bottom brick prepared by the invention has the advantages that the strength is greatly improved, the cleanliness of the high-temperature alloy cast by the mold bottom brick is higher, and the quality of the high-temperature alloy is effectively improved.
Drawings
FIG. 1 is a schematic representation of the use of the modular bottom block of the present invention.
Description of reference numerals: 1-ingot mould, 2-mould bottom brick and 3-asbestos rope.
Detailed Description
In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.
Example 1
A preparation method of a mold bottom brick for a high-temperature alloy ingot mold is characterized in that a coating with the thickness of 0.5-1 mm is uniformly coated on the mold bottom brick, and the preparation method specifically comprises the following steps: firstly, making a mould bottom brick, then making a coating of the mould bottom brick, then uniformly coating the coating on the use surface of the mould bottom brick, then placing the mould bottom brick in a heating furnace for baking, and drying for use.
(1) Preparing a mold bottom brick: putting 35% white corundum, 32% fused mullite, 28% alumina powder and 5% combined clay into a ball mill for ball milling, finishing milling when the particle size of the powder is less than 5 mu m, then putting the powder into a die, and keeping the temperature of 1380 ℃ and the pressure of 35MPa for 2h to obtain the corundum-mullite die bottom brick, wherein the tolerance of the outer diameter of the hot-pressed die bottom brick reaches the requirement of +/-1 mm, and the tolerance of the height reaches the requirement of +/-0.5 mm.
(2) Preparing the coating: the coating is a mixture of lead oxide, silicon amide and carbon, and the raw materials are respectively ball-milled into powder with the particle size of less than 1 mu m by using a ball mill. Taking 2kg of powder of 63% lead oxide, 32% silicon amide and 5% carbon, adding the three kinds of powder into water by using water with the same mass as a solvent, uniformly mixing, placing in a heating furnace at 50 ℃ for drying, and taking out for use when the coating is pasty.
(3) The coating is coated on the use surface of the mold bottom brick, and the thickness is 0.8 mm.
(4) And (3) placing the mold bottom brick coated with the coating into a heating furnace for drying, wherein the use surface is upward, the temperature of the heating furnace is 100 ℃, the mold bottom brick is taken out after being completely dried, the surface meets the requirements of smoothness, flatness, no air holes, no bubbles, no attachments and the like, and no coating peeling occurs on the surface. And if the prepared coating on the surface of the die bottom brick is peeled off, the coating on the surface needs to be removed, and the coating is re-prepared to be the coating on the die bottom brick until the coating of the die bottom brick is not peeled off.
The strength of the produced mold bottom brick is detected, and the detection result is shown in table 1:
TABLE 1 Strength of bottom brick of mold of inventive example 1
The mold bottom brick prepared in the embodiment 1 of the invention is used for casting in the process of smelting GH4169 alloy, 3 cast alloy ingots are respectively sliced, and the inclusion content of the cast alloy ingots is detected, wherein the specific conditions are shown in Table 2.
TABLE 2 content of inclusions in casting alloys using the mold bottom brick of the present invention
Comparative example 1
The strength of the conventional mold bottom brick fired by a tunnel kiln was measured, and the results are shown in Table 3, wherein the composition of the conventional mold bottom brick fired by a tunnel kiln was 90% Al2O3、9％SiO2And small amounts of MgO, CaO and Fe2O3、TiO2。
TABLE 3 comparative example 1 conventional form bottom brick Strength
In the same way, in the process of smelting GH4169 alloy, the conventional mold bottom brick is used for casting without a coating, 3 cast alloy ingots are respectively sliced, and the inclusion content of the alloy ingots is detected, wherein the specific conditions are shown in Table 4.
TABLE 4 content of inclusions in conventional die bottom brick casting alloys
It can be seen from the strength tests of the mold bottom bricks in example 1 and comparative example 1 that the mold bottom bricks of the present invention are superior to the conventional mold bottom bricks in compressive strength and bending strength in low and high temperature environments, and can effectively resist the impact of molten steel, and the rate of change of the mold bottom bricks at high temperature is lower than that of the conventional mold bottom bricks, and no large deformation occurs during casting. In the pouring process, because the die bottom brick has the characteristics of impact resistance, difficult deformation and the like, only a small amount of refractory materials are used as foreign inclusions to enter molten steel, the cleanliness of the molten steel is improved, and the alloy quality is improved.
In summary, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and the protection scope of the present invention is not limited thereto, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (7)
1. The preparation method of the mold bottom brick for the high-temperature alloy ingot mold is characterized in that the mold bottom brick is uniformly coated with a coating with the thickness of 0.5-1 mm, and the preparation method specifically comprises the following steps:
(1) preparing a die bottom brick and coating on the die bottom brick;
(2) and uniformly coating the prepared coating on the use surface of the die bottom brick, putting the die bottom brick coated with the coating with the use surface facing upwards in a heating furnace for baking, and drying to obtain a finished die bottom brick.
2. The method for preparing the mold bottom brick for the high-temperature alloy ingot mold according to claim 1, wherein the mold bottom brick is made of corundum-mullite and comprises the following components in parts by mass: white corundum: 30-40%, fused mullite: 30% -35%, alumina: 25% -30%, bonding clay: 4% -5%.
3. The method of manufacturing a mold bottom brick for a superalloy ingot mold according to claim 1, wherein the method of manufacturing the mold bottom brick is as follows: putting the white corundum, the fused mullite, the alumina powder and the combined clay into a ball mill for ball milling until the particle size of the powder is less than 5 mu m, and putting the powder into a die for hot press molding to obtain the corundum-mullite die bottom brick.
4. The method for manufacturing the mold bottom brick for the high-temperature alloy ingot mold according to claim 3, wherein the hot-pressing temperature during the hot-pressing molding is 1350-1400 ℃, the pressure is 30-40 MPa, and the holding time is 1-2 hours.
5. The method for preparing the die bottom brick for the superalloy steel ingot die according to claim 3, wherein the corundum-mullite die bottom brick has an outer diameter tolerance of ± 1mm and a height tolerance of ± 0.5 mm.
6. The method for preparing the mold bottom brick for the high-temperature alloy ingot mold according to claim 1, wherein the coating is a mixture of lead oxide, silicon amide and carbon, the raw materials are respectively ground into powder with the particle size smaller than 1 μm by using a ball mill, the three kinds of powder and water are mixed according to a mass ratio of 1:1, the mixture is uniformly mixed and then placed in a heating furnace for drying, and the coating is taken out for later use when the coating is pasty.
7. The method for preparing the mold bottom brick for the high-temperature alloy ingot mold according to claim 1 or 6, wherein the raw material ratio of the coating is as follows in mass fraction: lead oxide: 60% -65%, silicon amide: 30% -35%, carbon: 4% -6%.
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| CN104803692A (en) * | 2015-04-22 | 2015-07-29 | 浙江自立股份有限公司 | Corundum-mullite burnt brick applied to gas turbine combustion chamber and preparation method thereof |
| CN104891949A (en) * | 2015-06-28 | 2015-09-09 | 任碧龙 | High-temperature abrasion-resistant paint |
| CN106187248A (en) * | 2016-07-26 | 2016-12-07 | 济源市耐火炉业有限公司 | A kind of MULTILAYER COMPOSITE runner brick and production method thereof |
| CN107056259A (en) * | 2017-05-11 | 2017-08-18 | 辉县市东方耐火材料有限公司 | High temperature corundum-mullite brick and its production method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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