CN115388652A - Crucible assembly for induction furnace and preparation method thereof - Google Patents
Crucible assembly for induction furnace and preparation method thereof Download PDFInfo
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- CN115388652A CN115388652A CN202210915381.0A CN202210915381A CN115388652A CN 115388652 A CN115388652 A CN 115388652A CN 202210915381 A CN202210915381 A CN 202210915381A CN 115388652 A CN115388652 A CN 115388652A
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- crucible
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- outer lining
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- alumina
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- 230000006698 induction Effects 0.000 title claims abstract description 127
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 83
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 24
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004332 silver Substances 0.000 claims abstract description 22
- 229910052709 silver Inorganic materials 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 193
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 136
- 239000004744 fabric Substances 0.000 claims description 122
- 239000004576 sand Substances 0.000 claims description 109
- 239000000835 fiber Substances 0.000 claims description 91
- 238000005245 sintering Methods 0.000 claims description 78
- 238000011049 filling Methods 0.000 claims description 65
- 235000019353 potassium silicate Nutrition 0.000 claims description 34
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 28
- 239000000945 filler Substances 0.000 claims description 26
- 239000004033 plastic Substances 0.000 claims description 23
- 239000003365 glass fiber Substances 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 22
- 239000011247 coating layer Substances 0.000 claims description 18
- 238000012856 packing Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 15
- 239000002655 kraft paper Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 10
- 150000004706 metal oxides Chemical class 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000010425 asbestos Substances 0.000 claims description 7
- 229910052895 riebeckite Inorganic materials 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229910001020 Au alloy Inorganic materials 0.000 claims description 3
- 229910001252 Pd alloy Inorganic materials 0.000 claims description 3
- 229910001260 Pt alloy Inorganic materials 0.000 claims description 3
- 239000003353 gold alloy Substances 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 6
- 241000519995 Stachys sylvatica Species 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details specially adapted for crucible or pot furnaces
- F27B14/10—Crucibles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details specially adapted for crucible or pot furnaces
- F27B14/10—Crucibles
- F27B2014/104—Crucible linings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
The invention discloses a crucible assembly for an induction furnace and a preparation method thereof, wherein the induction furnace is used for smelting metal and comprises a furnace body, an induction coil is arranged in the furnace body, a crucible assembly can be arranged in the induction coil, the crucible assembly comprises a crucible assembly body and a sealing body arranged at the upper part of the crucible assembly body, the crucible assembly body comprises a cavity for containing raw materials, and the top end of the cavity is opened; the crucible assembly can realize the separation of the contact of a smelting high-temperature raw material and an induction coil, avoid short circuit or furnace explosion, effectively avoid the defects of surface white spots, white lines and the like caused by impurities mixed in a smelting process product, and effectively improve the safety, yield and production efficiency of smelting silver or silver alloy.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and particularly relates to a crucible assembly for an induction furnace and a preparation method thereof.
Background
Silver and silver alloy are noble metal materials with the largest use amount, and are mainly used as electric contact materials of precision instruments and noble metal ornament materials in the fields of aerospace and electronic industry.
Currently, an induction smelting furnace is generally adopted for vacuum smelting for preparing silver and silver alloy ingots, an alumina crucible is generally selected as a crucible for smelting, coarse alumina sand, fine sand and alumina powder are generally selected as materials of a filling layer between the alumina crucible and an induction coil, and the filling layer is used for connecting the alumina crucible and the induction coil and fixing the alumina crucible in the induction coil. The purpose of selecting and using the alumina fine sand and the alumina powder is to fill gaps among the alumina coarse sand and prevent a large cavity from being generated only by a filling layer of the alumina coarse sand in the induction melting vibration process. If the aluminum oxide crucible cracks in the smelting process to form larger cracks, high-temperature metal liquid flows into the filling layer, is in contact with the induction coil through the cavity, is connected with the induction coil to cause short circuit and even damage to the induction coil, and is in contact with cooling water in the induction coil to form a large amount of water vapor to cause serious accidents such as furnace explosion and the like.
When silver and silver alloy are continuously induction smelted, the crucible cracks due to repeated expansion and contraction and vibration, and when more than 5 furnaces of silver and silver alloy ingots are smelted, the crucible can form small cracks, and fine alumina powder can enter silver and silver alloy liquid from the filling layer; when the cracks are too many, under the impact of high-temperature melt, small crucible pieces can fall off from the crucible, the crucible is seriously damaged, the phenomenon of ceramic falling of the crucible is generated, and at the moment, fine alumina sand and even coarse alumina sand in the filling layer can enter silver and silver alloy liquid. When the silver and silver alloy liquid is cast into an ingot, fine alumina sand and coarse alumina sand are mixed on the surface layer of the silver and silver alloy ingot, and the alumina powder is dispersed in the whole silver and silver alloy ingot matrix. In the process of removing the oxide skin of the silver and silver alloy ingot by planing, because the fine alumina sand and the coarse alumina sand are mixed on the surface layer of the ingot, more silver and silver alloy can be planed in order to remove the fine alumina sand, and the finished product rate of the silver and silver alloy polished ingots is reduced; after silver and silver alloy are rolled into a strip or sheet finished product, alumina powder which is dispersed and distributed in a silver and silver alloy matrix is exposed, or white point-shaped surface defects or white line-shaped surface defects are formed, so that the surface quality of the silver and silver alloy strip or sheet is not good, and the yield of the product is greatly reduced.
Disclosure of Invention
The present invention provides a crucible assembly for an induction furnace and a method for manufacturing the same, which can solve the above-mentioned problems of the prior art. The crucible assembly comprising the crucible, the sintering layer, the filling layer, the crucible outer lining and the sealing body can realize the separation of the contact between the high-temperature smelting raw material and the induction coil, avoid short circuit or furnace explosion, effectively avoid the defects of white spots, white lines and the like caused by impurities mixed in the smelting process product, and effectively improve the safety, yield and production efficiency of high-melting silver or silver alloy.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the crucible assembly for the induction furnace is characterized by comprising a crucible assembly body and a sealing body arranged at the upper part of the crucible assembly body, wherein the crucible assembly body comprises a cavity for containing raw materials, and the top end of the cavity is opened;
the crucible assembly body comprises a crucible, a sintering layer, a filling layer and an outer crucible lining, wherein the sintering layer, the filling layer and the outer crucible lining are sequentially arranged outside the crucible from inside to outside;
the raw materials of the sintering layer comprise alumina coarse sand, alumina fine sand and water glass, wherein the mass ratio of the alumina coarse sand to the alumina fine sand to the water glass is (4.5-5.5) to (2.5-3.5) to (1.5-2.5); the raw materials of the filling layer comprise alumina coarse sand and alumina fine sand, and the mass of the alumina coarse sand is 2-4 times that of the alumina fine sand; the crucible outer lining comprises an outer lining packing layer and a fiber cloth layer, the outer lining packing layer is arranged in the fiber cloth layer, the outer lining packing layer comprises raw materials of alumina coarse sand, alumina fine sand, alumina powder and water glass, and the mass ratio of the alumina coarse sand to the alumina fine sand to the alumina powder to the water glass is (1.5-2.5): (0.5-1.5): 0.5-1.5); the raw materials of the sealing body comprise metal oxide sand and water glass.
The crucible assembly for an induction furnace as described above, wherein the metal comprises silver, silver alloy, gold alloy, platinum alloy, palladium or palladium alloy.
The crucible assembly for the induction furnace is characterized in that the crucible is an alumina crucible, a zirconia crucible or a quartz crucible.
The crucible component for the induction furnace is characterized in that the particle sizes of the alumina coarse sand are all 0.3 mm-0.6 mm; the grain size of the alumina fine sand is 0.1 mm-0.3 mm; the grain diameter of the alumina powder is 0.01 mm-0.03 mm; the material of fibre cloth layer is asbestos cloth and/or glass silk cloth.
The crucible assembly for the induction furnace is characterized by further comprising a glass fiber cloth layer, wherein the glass fiber cloth layer is arranged between the sintering layer and the filling layer; the glass fiber cloth layer is formed by winding glass fiber cloth along the periphery of the sintering layer, and the number of winding layers is 3-5.
The crucible assembly for the induction furnace is characterized in that the thickness of the sintering layer is 5 mm-20 mm; the thickness of the outer lining filler layer is 30 mm-50 mm.
In addition, the present invention also provides a method for preparing the crucible assembly for an induction furnace, comprising:
step one, providing a crucible provided with a sintering layer;
step two, providing a crucible outer lining;
thirdly, assembling the crucible provided with the sintering layer and the crucible outer lining, and arranging a filling layer to obtain a crucible assembly body;
and step four, sealing to obtain the crucible assembly.
The method is characterized in that the step one of providing the crucible provided with the sintering layer specifically comprises the following steps:
step 101, mixing and stirring alumina coarse sand, alumina fine sand and water glass to obtain sintering layer raw material slurry;
step 102, uniformly coating the sintering layer raw material slurry obtained in the step 101 on a crucible to a preset thickness, wrapping kraft paper, drying in the shade for 12-24 h, and removing the kraft paper to obtain the crucible coated with the sintering layer raw material;
103, putting the crucible coated with the sintering layer raw material in the step 102 into a box-type resistance furnace, baking for 2-4 h at 200-400 ℃, then sintering for 3-6 h at 600-900 ℃, and cooling along with the furnace to obtain the crucible provided with the sintering layer.
The method described above, wherein the step two of providing the outer crucible lining specifically comprises:
step 201, mixing and stirring coarse alumina sand, fine alumina sand, alumina powder and water glass to obtain a raw material of an outer lining filler layer;
202, placing first fiber cloth in an induction coil in a cylindrical shape, so that the first fiber cloth is tightly attached to the inner wall of the induction coil, and obtaining the induction coil with the fiber cloth;
step 203, placing a second fiber cloth on a refractory brick, uniformly paving the raw material of the outer lining filler layer in the step 201 on the second fiber cloth, and compacting to enable the raw material of the outer lining filler layer to be fully paved with the second fiber cloth to obtain the second fiber cloth paved with the raw material of the outer lining filler layer; the second fiber cloth and the first fiber cloth are asbestos cloth or glass fiber cloth; the thickness of the raw material of the compacted outer lining filler layer is 30 mm-50 mm;
step 204, vertically placing the induction coil provided with the fiber cloth in the step 202 at the center of the second fiber cloth paved with the raw material of the outer lining filler layer, placing a plastic pipe in the induction coil provided with the fiber cloth to enable the plastic pipe to be positioned at the center of the induction coil provided with the fiber cloth, forming an annular cavity between the plastic pipe and the induction coil provided with the fiber cloth, filling the raw material of the outer lining filler layer in the step 201 into the annular cavity, compacting, and removing the plastic pipe to obtain a blank body of the outer lining of the crucible;
step 205, standing the crucible outer lining blank body obtained in the step 204 until the crucible outer lining blank body is solidified to obtain a solidified crucible outer lining blank body;
and step 206, vertically placing the nickel rod in the solidified crucible outer lining blank body in the step 205, placing the solidified crucible outer lining blank body in which the nickel rod is placed in an induction furnace, starting the induction furnace, and baking for 4-6 hours to obtain the crucible outer lining.
The method is characterized in that the crucible provided with the sintering layer and the crucible outer lining are assembled in the third step, the filling layer is arranged, and the obtained crucible assembly body specifically comprises the following steps:
step 301, placing the crucible provided with the sintering layer in the step one at the center of the outer lining of the crucible in the step two, forming a cavity between the crucible provided with the sintering layer and the outer lining of the crucible, filling a filling layer raw material into the cavity, and compacting to obtain a crucible assembly body;
sealing in the fourth step to obtain the crucible assembly, wherein the method specifically comprises the following steps:
step 401, mixing metal oxide sand and water glass to obtain a viscous mixture for a sealing body;
step 402, paving the viscous mixture for the sealing body in the step 401 on the upper part of the crucible assembly body to form a sealing coating layer; the height of the sealing coating layer exceeding the crucible assembly body is 10-20 mm;
and 403, vertically placing the nickel rod in the assembly body with the seal coating layer formed in the step 402, placing the assembly body with the nickel rod in an induction furnace, starting the induction furnace, baking for 4-6 hours, and removing the nickel rod to obtain the crucible assembly for the induction furnace.
Compared with the prior art, the invention has the following advantages:
1. the crucible component for the induction furnace comprises the crucible, the sintering layer, the filling layer, the crucible outer lining and the sealing body, can realize the separation of the contact of high-temperature smelting raw materials and the induction coil, avoid short circuit or furnace explosion, effectively avoid the defects of white spots, white lines and the like caused by impurities mixed in products in the smelting process, and effectively improve the safety, yield and production efficiency of smelting silver or silver alloy.
2. The crucible assembly for the induction furnace comprises the crucible outer lining which is detachably arranged outside the filling layer, has long service life and can be used permanently, and the crucible outer lining and the filling layer are conveniently and easily separated after the sealing body is knocked off, so that the crucible with the sintering layer arranged inside is replaced, and the cost is reduced.
3. The crucible assembly for the induction furnace comprises the sintering layer arranged outside the crucible, and the raw materials of the sintering layer comprise coarse alumina sand, fine alumina sand and water glass, so that crack propagation of the crucible can be effectively avoided, porcelain falling is avoided, and effective protection of the crucible is realized.
4. Preferably, the crucible assembly for the induction furnace further comprises a glass fiber cloth layer arranged between the sintering layer and the filling layer, and can further prevent sand bodies in the filling layer from entering the smelting high-temperature raw material liquid.
5. The crucible component for the induction furnace comprises a sintering layer raw material consisting of alumina coarse sand, alumina fine sand and water glass and a filling layer raw material consisting of the alumina coarse sand and the alumina fine sand, and further prevents alumina powder in the prior art from entering a high-temperature smelting raw material liquid in the smelting process on the basis of forming effective sintering protection and filling protection.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural view of a crucible assembly for an induction furnace of example 1.
FIG. 2 SEM photograph of silver alloy strip obtained before the test on a scale of 50 μm.
FIG. 3 is an SEM photograph on a scale of 10 μm of the silver alloy ribbon obtained before the test.
Fig. 4 is an EDS photograph of the silver alloy ribbon obtained before the test.
Fig. 5 is a graph of energy spectrum analysis corresponding to fig. 4.
Fig. 6 is an SEM photograph of the silver alloy ribbon obtained after the test.
Detailed Description
Example 1
The embodiment provides a crucible assembly for an induction furnace, as shown in fig. 1, the induction furnace is used for smelting metal, the metal comprises silver, silver alloy, gold alloy, platinum alloy, palladium or palladium alloy, the induction furnace comprises a furnace body, an induction coil is arranged in the furnace body, the crucible assembly can be arranged in the induction coil, the crucible assembly comprises a crucible assembly body and a sealing body 6 arranged at the upper part of the crucible assembly body, the crucible assembly body comprises a cavity for containing raw materials, and the top end of the cavity is open; the crucible assembly body comprises a wall body which surrounds to form the cavity, and the sealing body 6 is arranged on the wall body;
the crucible assembly body comprises a crucible 1, a sintering layer 2, a filling layer 4 and a crucible outer lining 5, wherein the cavity is formed in the crucible 1, and the sintering layer 2, the filling layer 4 and the crucible outer lining 5 are sequentially arranged outside the crucible 1 from inside to outside;
the crucible 1 is an alumina crucible, a zirconia crucible or a quartz crucible;
the raw materials of the sintered layer 2 comprise alumina coarse sand, alumina fine sand and water glass, the mass ratio of the alumina coarse sand to the alumina fine sand to the water glass is (4.5-5.5) to (2.5-3.5) to (1.5-2.5), for example, the mass ratio of the alumina coarse sand to the alumina fine sand to the water glass is (4.5; the grain size of the alumina coarse sand is 0.3 mm-0.6 mm, and the grain size of the alumina fine sand is 0.1 mm-0.3 mm;
the raw materials of the filling layer 4 include alumina coarse sand and alumina fine sand, the mass of the alumina coarse sand is 2-4 times of the mass of the alumina fine sand, for example, 2 times, 3 times or 4 times, and the mass of the alumina coarse sand in this embodiment is 3 times of the mass of the alumina fine sand;
the crucible outer lining 5 comprises an outer lining packing layer and a fiber cloth layer, the outer lining packing layer is arranged in the fiber cloth layer, the outer lining packing layer comprises raw materials of alumina coarse sand, alumina fine sand, alumina powder and water glass, and the mass ratio of the alumina coarse sand to the alumina fine sand to the alumina powder to the water glass is (1.5-2.5): (0.5-1.5): 0.5-1.5), for example, 1.5:1.5: 0.5; the grain diameter of the alumina powder is 0.01 mm-0.03 mm; the fiber cloth layer is made of asbestos cloth and/or glass fiber cloth;
the sealing body 6 comprises the following raw materials of metal oxide sand and water glass, wherein the mass of the metal oxide sand is 3-4 times that of the water glass, and the metal oxide sand is magnesia sand or alumina sand; the particle sizes of the magnesia sand and the alumina sand are both 0.01-0.3 mm;
the crucible 1 comprises a cylinder part and a bottom part arranged at the lower part of the cylinder part, and the cylinder part and the bottom part surround to form the cavity; the shape of the crucible barrel part is preferably a straight barrel shape;
the crucible assembly for the induction furnace of the embodiment further comprises a glass fiber cloth layer 3, wherein the glass fiber cloth layer 3 is arranged between the sintering layer 2 and the filling layer 4; the glass fiber cloth layer 3 is formed by winding glass fiber cloth along the periphery of the sintering layer 2, and the number of winding layers is 3-5; the temperature resistance of the glass fiber cloth can reach 550-1200 ℃, and the glass fiber cloth is purchased from orange twigs or blue-lipped mountains;
in the crucible assembly for the induction furnace of the embodiment, the thickness of the sintering layer 2 is 5 mm-20 mm; the thickness of the outer lining filler layer is 30 mm-50 mm;
the filling layer 4 is composed of a vertical wall filling part and an bottom filling part, the vertical wall filling part corresponds to the barrel part of the crucible 1, the thickness of the vertical wall filling part is 2-3 times of the thickness of the crucible 1, and the thickness of the bottom filling part is 1.5-2.5 times of the thickness of the crucible 1.
Example 2
This example provides a method of preparing the crucible assembly for an induction furnace of example 1, comprising:
step one, providing a crucible provided with a sintering layer, and specifically comprising:
step 101, mixing and stirring alumina coarse sand, alumina fine sand and water glass according to a mass ratio of 5; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
step 102, uniformly coating the sintering layer raw material slurry obtained in the step 101 on a crucible 1 to a preset thickness, wrapping kraft paper outside the sintering layer raw material slurry coated on the crucible 1 for fixing, drying in the shade for 15h, and removing the kraft paper to obtain a crucible coated with the sintering layer raw material; the preset thickness is 10mm;
103, putting the crucible coated with the sintering layer raw material in the step 102 into a box-type resistance furnace, heating along with the furnace, baking at 300 ℃ for 3 hours, sintering at 800 ℃ for 4 hours, and cooling along with the furnace to obtain a crucible provided with a sintering layer;
step two, providing a crucible outer lining 5, which specifically comprises the following steps:
step 201, mixing and stirring alumina coarse sand, alumina fine sand, alumina powder and water glass according to a mass ratio of 2; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
202, placing a first fiber cloth into an induction coil in a cylindrical shape, so that the first fiber cloth is tightly attached to the inner wall of the induction coil, and obtaining the induction coil with the fiber cloth; the first fiber cloth is rectangular, the length of the first fiber cloth is 1.5 times of the inner circumference of the induction coil, and the width of the first fiber cloth is +100mm of the height of the induction coil;
step 203, placing a second fiber cloth on the refractory bricks, uniformly paving part of the raw materials of the outer lining packing layer in the step 201 on the second fiber cloth, compacting to enable the raw materials of the outer lining packing layer to be fully paved with the second fiber cloth, and obtaining the second fiber cloth paved with the raw materials of the outer lining packing layer; the diameter of the second fiber cloth is 1.2 times of that of the induction coil; the second fiber cloth and the first fiber cloth are asbestos cloth; the thickness of the raw material of the compacted outer lining filler layer is 40mm;
step 204, vertically placing the induction coil provided with the fiber cloth in the step 202 at the center of the second fiber cloth paved with the raw material of the outer lining filler layer, placing a plastic pipe in the induction coil provided with the fiber cloth to enable the plastic pipe to be positioned at the center of the induction coil provided with the fiber cloth, forming an annular cavity between the plastic pipe and the induction coil provided with the fiber cloth, filling part of the raw material of the outer lining filler layer in the step 201 into the annular cavity, compacting, and removing the plastic pipe to obtain a crucible outer lining blank body; the diameter of the plastic pipe, namely the diameter of the crucible, is more than or equal to 60mm;
step 205, standing the crucible outer lining blank body in the step 204 for 36 hours until the crucible outer lining blank body is solidified, and obtaining a solidified crucible outer lining blank body;
step 206, vertically placing a nickel rod in the center of the solidified crucible outer lining blank body in the step 205, placing the solidified crucible outer lining blank body with the nickel rod in an induction furnace, starting the induction furnace, and baking for 5 hours to obtain a crucible outer lining 5; to remove moisture; the furnace temperature is 1000 ℃;
step three, assembling the crucible with the sintering layer and the crucible outer lining 5, and arranging a filling layer to obtain a crucible assembly body; the method specifically comprises the following steps:
step 301, placing the crucible provided with the sintering layer in the step 103 at the center of the outer crucible lining in the step 206, forming a cavity between the crucible provided with the sintering layer and the outer crucible lining, filling a filling layer raw material into the cavity, and compacting to obtain a crucible assembly body; the raw material of the filling layer is a mixture of alumina coarse sand and alumina fine sand, and the mass of the alumina coarse sand is 3 times that of the alumina fine sand; the top of the sintering layer and the top of the outer crucible lining are flush with the opening of the crucible, and the distance between the filling layer 4 and the opening of the crucible is 25mm;
step four, sealing to obtain a crucible assembly, which specifically comprises the following steps:
step 401, mixing metal oxide sand and water glass according to a mass ratio of 3;
step 402, paving the viscous mixture for the sealing body in the step 401 on the upper part of the crucible assembly body in the step 301 to form a sealing coating layer; the height of the sealing coating layer exceeding the crucible assembly body is 15mm, and the sealing coating layer is filled in a space between the filling layer 4 and the crucible opening; the crucible assembly for the induction furnace can be smelted 45 to 50 times, and the sealing body is taken out when the crucible assembly needs to be replaced, so that the outer lining of the crucible is separated from the filling layer;
step 403, vertically placing a nickel rod in the assembly body with the sealing coating layer formed in the step 402 and locating the nickel rod at the center, placing the assembly body with the nickel rod in an induction furnace, starting the induction furnace, baking for 5 hours, and removing the nickel rod to obtain a crucible assembly for the induction furnace; to remove moisture; the furnace temperature was 1000 ℃.
Example 3
The third step is the same as the second step in example 2, except that the glass fiber cloth is wound on the crucible provided with the sintered layer, wherein the number of winding layers is 3-5; the wound glass fiber cloth is not loosened by knotting the tail part.
Example 4
This example provides a method for preparing the crucible assembly for an induction furnace according to example 1, comprising:
step one, providing a crucible provided with a sintering layer, and specifically comprising:
step 101, mixing and stirring alumina coarse sand, alumina fine sand and water glass according to a mass ratio of 5; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
step 102, uniformly coating the sintering layer raw material slurry obtained in the step 101 on the crucible 1 to a preset thickness, wrapping kraft paper outside the sintering layer raw material slurry coated on the crucible 1 for fixing, drying in the shade for 12h, and removing the kraft paper to obtain a crucible coated with the sintering layer raw material; the preset thickness is 5mm;
103, putting the crucible coated with the sintering layer raw material in the step 102 into a box-type resistance furnace, heating along with the furnace, baking at 200 ℃ for 4 hours, sintering at 600 ℃ for 6 hours, and cooling along with the furnace to obtain a crucible provided with a sintering layer;
step two, providing a crucible outer lining 5, which specifically comprises the following steps:
step 201, mixing and stirring alumina coarse sand, alumina fine sand, alumina powder and water glass according to a mass ratio of 2; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
202, placing a first fiber cloth into an induction coil in a cylindrical shape, so that the first fiber cloth is tightly attached to the inner wall of the induction coil, and obtaining the induction coil with the fiber cloth; the first fiber cloth is rectangular, the length of the first fiber cloth is 1.5 times of the inner circumference of the induction coil, and the width of the first fiber cloth is +100mm of the height of the induction coil;
step 203, placing a second fiber cloth on a refractory brick, uniformly paving part of the raw materials of the outer lining filler layer in the step 201 on the second fiber cloth, compacting to enable the raw materials of the outer lining filler layer to be fully paved with the second fiber cloth, and obtaining the second fiber cloth paved with the raw materials of the outer lining filler layer; the diameter of the second fiber cloth is 1.2 times of that of the induction coil; the second fiber cloth is asbestos cloth, and the second fiber cloth is glass fiber cloth; the thickness of the raw material of the compacted outer lining filler layer is 30mm;
step 204, vertically placing the induction coil provided with the fiber cloth in the step 202 at the center of the second fiber cloth paved with the raw material of the outer lining filler layer, placing a plastic pipe in the induction coil provided with the fiber cloth to enable the plastic pipe to be positioned at the center of the induction coil provided with the fiber cloth, forming an annular cavity between the plastic pipe and the induction coil provided with the fiber cloth, filling part of the raw material of the outer lining filler layer in the step 201 into the annular cavity, compacting, and removing the plastic pipe to obtain a crucible outer lining blank body; the diameter of the plastic tube, namely the diameter of the crucible, is more than or equal to 60mm;
step 205, standing the crucible outer lining blank body obtained in the step 204 for 24 hours until the crucible outer lining blank body is solidified, and obtaining a solidified crucible outer lining blank body;
step 206, vertically placing a nickel rod in the center of the solidified crucible outer lining blank body in the step 205, placing the solidified crucible outer lining blank body with the nickel rod in an induction furnace, starting the induction furnace, and baking for 4 hours to obtain a crucible outer lining 5; to remove moisture; the furnace temperature is 800 ℃;
step three, assembling the crucible with the sintering layer and the crucible outer lining 5, and arranging a filling layer to obtain a crucible assembly body; the method specifically comprises the following steps:
step 301, placing the crucible provided with the sintering layer in the step 103 at the center of the outer lining of the crucible in the step 206, forming a cavity between the crucible provided with the sintering layer and the outer lining of the crucible, filling a filling layer raw material into the cavity, and compacting to obtain a crucible assembly body; the raw material of the filling layer is a mixture of alumina coarse sand and alumina fine sand, and the mass of the alumina coarse sand is 3 times that of the alumina fine sand; the top of the sintering layer and the top of the outer crucible lining are flush with the opening of the crucible, and the distance between the filling layer 4 and the opening of the crucible is 20mm;
step four, sealing to obtain a crucible assembly, which specifically comprises the following steps:
step 401, mixing metal oxide sand and water glass according to a mass ratio of 3;
step 402, paving the viscous mixture for the sealing body in the step 401 on the upper part of the crucible assembly body in the step 301 to form a sealing coating layer; the height of the sealing coating layer exceeding the crucible assembly body is 10mm, and the sealing coating layer is filled in a space between the filling layer 4 and the opening of the crucible;
step 403, vertically placing a nickel rod in the assembly body with the sealing coating layer formed in the step 402 and locating the nickel rod at the center, placing the assembly body with the nickel rod in an induction furnace, starting the induction furnace, baking for 4 hours, and removing the nickel rod to obtain a crucible assembly for the induction furnace; to remove moisture; the furnace temperature is 800 ℃.
The properties of the crucible assembly for an induction furnace obtained in this example were substantially the same as those of example 2.
Example 5
This example provides a method of preparing the crucible assembly for an induction furnace of example 1, comprising:
step one, providing a crucible provided with a sintering layer, and specifically comprising:
step 101, mixing and stirring alumina coarse sand, alumina fine sand and water glass according to a mass ratio of 5; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
step 102, uniformly coating the sintering layer raw material slurry obtained in the step 101 on the crucible 1 to a preset thickness, wrapping kraft paper outside the sintering layer raw material slurry coated on the crucible 1 for fixing, drying in the shade for 24 hours, and removing the kraft paper to obtain a crucible coated with the sintering layer raw material; the preset thickness is 20mm;
103, putting the crucible coated with the sintering layer raw material in the step 102 into a box-type resistance furnace, heating along with the furnace, baking at 400 ℃ for 2h, sintering at 900 ℃ for 3h, and cooling along with the furnace to obtain a crucible provided with a sintering layer;
step two, providing a crucible outer lining 5, which specifically comprises the following steps:
step 201, mixing and stirring alumina coarse sand, alumina fine sand, alumina powder and water glass according to a mass ratio of 2; the stirring is carried out until the system is hung on an alumina stirring rod and does not fall off;
202, placing first fiber cloth in an induction coil in a cylindrical shape, so that the first fiber cloth is tightly attached to the inner wall of the induction coil, and obtaining the induction coil with the fiber cloth; the first fiber cloth is rectangular, the length of the first fiber cloth is 1.5 times of the inner circumference of the induction coil, and the width of the first fiber cloth is +100mm of the height of the induction coil;
step 203, placing a second fiber cloth on the refractory bricks, uniformly paving part of the raw materials of the outer lining packing layer in the step 201 on the second fiber cloth, compacting to enable the raw materials of the outer lining packing layer to be fully paved with the second fiber cloth, and obtaining the second fiber cloth paved with the raw materials of the outer lining packing layer; the diameter of the second fiber cloth is 1.2 times of that of the induction coil; the second fiber cloth and the first fiber cloth are both glass fiber cloth; the thickness of the raw material of the compacted outer lining filler layer is 50mm;
step 204, vertically placing the induction coil provided with the fiber cloth in the step 202 at the center of the second fiber cloth paved with the raw material of the outer lining filler layer, placing a plastic pipe in the induction coil provided with the fiber cloth to enable the plastic pipe to be positioned at the center of the induction coil provided with the fiber cloth, forming an annular cavity between the plastic pipe and the induction coil provided with the fiber cloth, filling part of the raw material of the outer lining filler layer in the step 201 into the annular cavity, compacting, and removing the plastic pipe to obtain a crucible outer lining blank body; the diameter of the plastic tube, namely the diameter of the crucible, is more than or equal to 60mm;
step 205, standing the crucible outer lining blank body obtained in the step 204 for 48 hours until the crucible outer lining blank body is solidified, and obtaining a solidified crucible outer lining blank body;
step 206, vertically placing a nickel rod in the center of the solidified crucible outer lining blank in the step 205, placing the solidified crucible outer lining blank in which the nickel rod is placed in an induction furnace, starting the induction furnace, and baking for 6 hours to obtain a crucible outer lining 5; to remove moisture; the furnace temperature is 1200 ℃;
step three, assembling the crucible with the sintering layer and the crucible outer lining 5, and arranging a filling layer to obtain a crucible assembly body; the method specifically comprises the following steps:
step 301, placing the crucible provided with the sintering layer in the step 103 at the center of the outer lining of the crucible in the step 206, forming a cavity between the crucible provided with the sintering layer and the outer lining of the crucible, filling a filling layer raw material into the cavity, and compacting to obtain a crucible assembly body; the raw material of the filling layer is a mixture of alumina coarse sand and alumina fine sand, and the mass of the alumina coarse sand is 3 times that of the alumina fine sand; the top of the sintering layer and the top of the outer crucible lining are flush with the opening of the crucible, and the distance between the filling layer 4 and the opening of the crucible is 30mm;
step four, sealing to obtain a crucible assembly, which specifically comprises the following steps:
step 401, mixing metal oxide sand and water glass according to a mass ratio of 4;
step 402, paving the viscous mixture for the sealing body in the step 401 on the upper part of the crucible assembly body in the step 301 to form a sealing coating layer; the height of the sealing coating layer exceeding the crucible assembly body is 20mm, and the sealing coating layer is filled in a space between the filling layer 4 and the opening of the crucible;
step 403, vertically placing a nickel rod in the assembly body with the seal coating layer formed in the step 402, wherein the nickel rod is located in the center, placing the assembly body with the nickel rod in an induction furnace, starting the induction furnace, baking for 6 hours, and removing the nickel rod to obtain a crucible assembly for the induction furnace; to remove moisture; the furnace temperature was 1200 ℃.
The properties of the crucible assembly for an induction furnace obtained in this example were substantially the same as those of example 2.
Performance evaluation:
example 2 the yield of silver alloy melting using the crucible assembly for an induction furnace is shown in table 1. The smelting process comprises the steps of putting a silver alloy material into a crucible, sealing the furnace, vacuumizing, starting heating when the vacuum degree is less than 0.1Pa, wherein the heating power is 10kw until silver in the crucible is completely melted, continuing heating for 6-8 min for refining, closing a valve for heating, filling argon to 0.06-0.08 MPa, increasing the heating power to 25kw, raising the temperature for 2min, wherein the temperature can be 1100 ℃, reducing the power to 10kw, pouring in an electrified manner, cooling along with the furnace for 15min, and discharging.
The pre-test yields in Table 1 are the yields obtained by carrying out the above-described melting process using a conventional alumina crucible, which is 99% Al based on the material, and the post-test yields are the yields obtained by carrying out the above-described melting process using the crucible assembly prepared as described in example 2 2 O 3 An alumina crucible, i.e. crucible 1 in step 102 of example 2. As can be seen from Table 1, the yield of the crucible assembly adopting the invention is obviously improved, which shows that the crucible assembly of the invention can effectively avoid the pollution of the alumina powder to the silver alloy material in the traditional crucible.
Table 1 example 2 yield of silver alloy melting using crucible assembly for induction furnace
Fig. 2 and 3 are SEM photographs of the silver alloy ribbon obtained before the test, in which fig. 2 is a picture on a 50 μm scale and fig. 3 is a picture on a 10 μm scale, and it can be seen that defects such as white lines, and intermediate particulate matter inclusions exist on the surface of the silver alloy ribbon.
Fig. 4 is an EDS photograph of the silver alloy strip obtained before the test, fig. 5 is a graph corresponding to the spectrum analysis of fig. 4, and it can be seen from fig. 4 and 5 that the intermediate inclusions in the silver alloy strip are alumina particles. As can be seen from fig. 2 to 5, the generation of white spots and white lines on the surface of the silver alloy strip is one of the main causes of low yield, and it is possible that hard alumina particles are not easily deformed during the rolling process of the silver alloy, and damage is performed on the surface of the silver alloy, which may cause the surface quality of the silver alloy to be poor and the yield to be reduced.
Fig. 6 is an SEM photograph of the silver alloy strip obtained after the test, and it can be seen from fig. 6 that the silver alloy surface after the test has no white dots or white lines, good surface quality, and higher yield, indicating that the crucible assembly of the present invention can effectively avoid the contamination of the alumina powder to the metal material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The crucible assembly for the induction furnace is used for smelting metal, and comprises a furnace body, wherein an induction coil is arranged in the furnace body, and the crucible assembly can be arranged in the induction coil;
the crucible assembly body comprises a crucible (1), a sintering layer (2), a filling layer (4) and a crucible outer lining (5), wherein the sintering layer (2), the filling layer (4) and the crucible outer lining (5) are sequentially arranged outside the crucible (1) from inside to outside;
the raw materials of the sintering layer (2) comprise coarse alumina sand, fine alumina sand and water glass, wherein the mass ratio of the coarse alumina sand to the fine alumina sand to the water glass is (4.5-5.5) to (2.5-3.5) to (1.5-2.5); the raw materials of the filling layer (4) comprise alumina coarse sand and alumina fine sand, and the mass of the alumina coarse sand is 2-4 times that of the alumina fine sand; the crucible outer lining (5) comprises an outer lining packing layer and a fiber cloth layer, the outer lining packing layer is arranged in the fiber cloth layer, the outer lining packing layer comprises raw materials of alumina coarse sand, alumina fine sand, alumina powder and water glass, and the mass ratio of the alumina coarse sand to the alumina fine sand to the alumina powder to the water glass is (1.5-2.5): (0.5-1.5): 0.5-1.5); the sealing body (6) comprises metal oxide sand and water glass as raw materials.
2. The crucible assembly for an induction furnace of claim 1, wherein the metal comprises silver, silver alloy, gold alloy, platinum alloy, palladium or palladium alloy.
3. Crucible assembly for induction furnaces according to claim 1, characterized in that the crucible (1) is an alumina crucible, a zirconia crucible or a quartz crucible.
4. The crucible assembly for an induction furnace according to claim 1, wherein the alumina grit has a particle size of 0.3mm to 0.6mm; the grain sizes of the alumina fine sands are all 0.1 mm-0.3 mm; the grain diameter of the alumina powder is 0.01 mm-0.03 mm; the material of fibre cloth layer is asbestos cloth and/or glass silk cloth.
5. The crucible assembly for an induction furnace according to claim 1, further comprising a glass fiber cloth layer (3), the glass fiber cloth layer (3) being disposed between the sintered layer (2) and the filling layer (4); the glass fiber cloth layer (3) is formed by winding glass fiber cloth along the periphery of the sintering layer (2), and the number of winding layers is 3-5.
6. Crucible assembly for induction furnaces according to claim 1, characterized in that the sintered layer (2) has a thickness of 5mm to 20mm; the thickness of the outer lining filler layer is 30 mm-50 mm.
7. A method for preparing the crucible assembly for an induction furnace according to any one of claims 1 to 6, comprising:
step one, providing a crucible provided with a sintering layer;
step two, providing a crucible outer lining (5);
thirdly, assembling the crucible provided with the sintering layer and a crucible outer lining (5), and arranging a filling layer (4) to obtain a crucible assembly body;
and step four, sealing to obtain the crucible assembly.
8. Method according to claim 7, characterized in that the provision of a crucible provided with a sintered layer in step one comprises in particular:
step 101, mixing and stirring alumina coarse sand, alumina fine sand and water glass to obtain sintering layer raw material slurry;
step 102, uniformly coating the sintering layer raw material slurry obtained in the step 101 on a crucible (1) to a preset thickness, wrapping kraft paper, drying in the shade for 12-24 hours, and removing the kraft paper to obtain the crucible coated with the sintering layer raw material;
103, putting the crucible coated with the sintering layer raw material in the step 102 into a box-type resistance furnace, baking for 2-4 h at 200-400 ℃, then sintering for 3-6 h at 600-900 ℃, and cooling along with the furnace to obtain the crucible provided with the sintering layer.
9. The method according to claim 7, wherein the step two of providing the outer crucible lining (5) comprises:
step 201, mixing and stirring alumina coarse sand, alumina fine sand, alumina powder and water glass to obtain a raw material of an outer lining filler layer;
202, placing a first fiber cloth into an induction coil in a cylindrical shape, so that the first fiber cloth is tightly attached to the inner wall of the induction coil, and obtaining the induction coil with the fiber cloth;
step 203, placing a second fiber cloth on the refractory bricks, uniformly paving the raw material of the outer lining packing layer on the second fiber cloth in the step 201, and compacting to fully pave the raw material of the outer lining packing layer on the second fiber cloth to obtain the second fiber cloth paved with the raw material of the outer lining packing layer; the second fiber cloth and the first fiber cloth are asbestos cloth or glass fiber cloth; the thickness of the raw material of the compacted outer lining filler layer is 30 mm-50 mm;
step 204, vertically placing the induction coil provided with the fiber cloth in the step 202 at the center of the second fiber cloth paved with the raw material of the outer lining filler layer, placing a plastic pipe in the induction coil provided with the fiber cloth to enable the plastic pipe to be positioned at the center of the induction coil provided with the fiber cloth, forming an annular cavity between the plastic pipe and the induction coil provided with the fiber cloth, filling the raw material of the outer lining filler layer in the step 201 into the annular cavity, compacting, and removing the plastic pipe to obtain a blank body of the outer lining of the crucible;
step 205, standing the crucible outer lining blank body obtained in the step 204 until the crucible outer lining blank body is solidified to obtain a solidified crucible outer lining blank body;
and step 206, vertically placing the nickel rod in the solidified crucible outer lining blank body obtained in the step 205, placing the solidified crucible outer lining blank body in which the nickel rod is placed in an induction furnace, starting the induction furnace, and baking for 4-6 hours to obtain the crucible outer lining (5).
10. The method according to claim 7, characterized in that assembling in step three the crucible provided with the sintered layer and the outer crucible lining (5), providing the filling layer, obtaining the body of the crucible assembly in particular comprises:
step 301, placing the crucible provided with the sintering layer in the step one at the center of the outer lining of the crucible in the step two, forming a cavity between the crucible provided with the sintering layer and the outer lining of the crucible, filling a filling layer raw material into the cavity, and compacting to obtain a crucible assembly body;
sealing in the fourth step to obtain the crucible assembly, which specifically comprises the following steps:
step 401, mixing metal oxide sand and water glass to obtain a viscous mixture for a sealing body;
402, paving the viscous mixture for the sealing body in the step 401 on the upper part of the crucible assembly body to form a sealing coating layer; the height of the sealing coating layer exceeding the crucible assembly body is 10-20 mm;
and 403, vertically placing the nickel rod in the assembly body with the seal coating layer formed in the step 402, placing the assembly body with the nickel rod in an induction furnace, starting the induction furnace, baking for 4-6 hours, and removing the nickel rod to obtain the crucible assembly for the induction furnace.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116239390A (en) * | 2023-01-17 | 2023-06-09 | 包头钢铁（集团）有限责任公司 | Preparation process method of refractory brick crucible of 25kg vacuum induction furnace |
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