CN112939584B - Ceramic/metal composite furnace tube and preparation method and application thereof - Google Patents
Ceramic/metal composite furnace tube and preparation method and application thereof Download PDFInfo
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- CN112939584B CN112939584B CN202110356405.9A CN202110356405A CN112939584B CN 112939584 B CN112939584 B CN 112939584B CN 202110356405 A CN202110356405 A CN 202110356405A CN 112939584 B CN112939584 B CN 112939584B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 113
- 239000002905 metal composite material Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 49
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 24
- 239000010935 stainless steel Substances 0.000 claims abstract description 20
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 23
- 239000000395 magnesium oxide Substances 0.000 claims description 23
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 19
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 19
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 18
- 229910052727 yttrium Inorganic materials 0.000 claims description 18
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 10
- 238000007751 thermal spraying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 5
- 238000002161 passivation Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
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- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
- C23C4/16—Wires; Tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- Mechanical Engineering (AREA)
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention provides a ceramic/metal composite furnace tube and a preparation method and application thereof, belonging to the technical field of furnace tubes. The ceramic/metal composite furnace provided by the invention depends on the large size of the metal furnace tube, and the ceramic layer is loaded on the outer surface of the metal furnace tube, so that the defect that the whole furnace tube is made of a ceramic material and cannot be elongated greatly is avoided, the corrosion of corrosive materials to the metal furnace tube is also avoided, and the large size of the metal furnace tube is also ensured. In addition, the ceramic layer is made of the material, so that the ceramic layer and the stainless steel metal furnace tube have the same expansion coefficient, the cracking caused by the difference of the expansion coefficients of the base body and the load layer is avoided, and the application range of the metal furnace tube is expanded. The preparation method of the ceramic/metal composite furnace tube provided by the invention enables the ceramic/metal composite furnace tube to have excellent strength.
Description
Technical Field
The invention relates to the technical field of furnace tubes, in particular to a ceramic/metal composite furnace tube and a preparation method and application thereof.
Background
Most furnace tubes of the furnaces on the market are made of metal materials, and the majority of furnace tubes are made of 310S stainless steel heat-resistant alloy. However, when the metal furnace tube is fired with corrosive materials, the corrosive materials can corrode the tube wall of the metal furnace tube; the impurities on the inner wall of the metal furnace tube will fall off and mix into the material, and the impurities will damage the metal furnace tube and even react with the material to cause explosion.
Therefore, in order to meet the firing requirements of special materials, ceramic furnace tubes exhibit excellent properties. However, the ceramic furnace tube is affected by the material characteristics or the firing method, so that the ceramic furnace tube cannot be lengthened greatly, and the small ceramic furnace tube can only meet the research requirements of the experimental furnace and cannot meet the requirements of industrial production.
Disclosure of Invention
In view of this, the present invention provides a ceramic/metal composite furnace tube, and a method for manufacturing the same and an application thereof. The ceramic/metal composite furnace tube provided by the invention has a large size, and can be used for sintering corrosive materials.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a ceramic/metal composite furnace tube, which comprises a metal furnace tube and a ceramic layer attached to the outer surface of the metal furnace tube; the ceramic layer comprises the following preparation raw materials in percentage by mass:
5-25% of silicon oxide, 5-15% of magnesium oxide and 60-85% of aluminum oxide;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m;
the metal furnace tube is made of stainless steel.
Preferably, the ceramic layer has a thickness of 0.1 to 0.35mm.
Preferably, the material of the metal furnace tube is 310S stainless steel, 304 stainless steel or 316L stainless steel.
Preferably, an alumina yttrium transition layer is arranged between the metal furnace tube and the ceramic layer.
Preferably, the thickness of the alumina yttrium transition layer is 0.1-0.2 mm.
The invention also provides a preparation method of the ceramic/metal composite furnace tube, which comprises the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
spraying the ceramic material on the outer surface of the metal furnace tube to obtain the ceramic/metal composite furnace tube;
the metal furnace tube is made of stainless steel;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m.
Preferably, the pre-sintering temperature is 700-800 ℃, and the time is 10-16 h.
Preferably, the spraying is plasma thermal spraying; the parameters of the plasma thermal spray include: the current is 550-600A, the voltage is 60-90V, and the spraying distance is 30-50 mm.
Preferably, when the ceramic/metal composite furnace tube comprises the alumina yttrium transition layer, the preparation method of the ceramic/metal composite furnace tube comprises the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
and spraying an alumina yttrium material and a ceramic material on the outer surface of the metal furnace tube in sequence to obtain the ceramic/metal composite furnace tube.
The invention also provides application of the ceramic/metal composite furnace tube in the technical scheme or the ceramic/metal composite furnace tube obtained by the preparation method in the technical scheme in sintering corrosive materials.
The invention provides a ceramic/metal composite furnace tube, which comprises a metal furnace tube and a ceramic layer attached to the outer surface of the metal furnace tube; the ceramic layer comprises the following preparation raw materials in percentage by mass: 5-25% of silicon oxide, 5-15% of magnesium oxide and 60-85% of aluminum oxide; the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m; the metal furnace tube is made of stainless steel. The ceramic/metal composite furnace tube provided by the invention depends on the large size of the metal furnace tube, and the ceramic layer is loaded on the outer surface of the metal furnace tube, so that the defect that the whole furnace tube is made of a ceramic material and cannot grow greatly is avoided, the corrosion of corrosive materials to the metal furnace tube is also avoided, and the large size of the metal furnace tube is ensured. In addition, the ceramic layer is made of the material, so that the ceramic layer and the stainless steel metal furnace tube have the same expansion coefficient, and the condition of cracking caused by different expansion coefficients of the base body and the load layer is avoided.
Furthermore, the alumina yttrium transition layer is arranged between the metal furnace tube and the ceramic layer, so that the bonding strength between the ceramic layer and the metal furnace tube is further improved.
The invention also provides a preparation method of the ceramic/metal composite furnace tube, which comprises the steps of mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material; pre-burning the mixed material to obtain a ceramic material; spraying the ceramic material on the outer surface of the metal furnace tube to obtain the ceramic/metal composite furnace tube; the metal furnace tube is made of stainless steel; the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m. According to the invention, the mixed material obtained by mixing and grinding the silicon oxide, the magnesium oxide and the aluminum oxide is subjected to pre-sintering, so that the structural strength of the ceramic layer is improved, and the strength of the ceramic/metal composite furnace tube is further improved.
The invention also provides the application of the ceramic/metal composite furnace tube in the technical scheme or the ceramic/metal composite furnace tube obtained by the preparation method in the technical scheme in sintering corrosive materials. Because the outermost layer of the ceramic/metal composite furnace tube provided by the invention is the ceramic layer, and the inertia of the ceramic layer ensures that the ceramic/metal composite furnace tube cannot be corroded when the corrosive materials are sintered, thereby expanding the application range of the metal furnace tube.
Detailed Description
The invention provides a ceramic/metal composite furnace tube, which comprises a metal furnace tube and a ceramic layer attached to the outer surface of the metal furnace tube; the ceramic layer comprises the following preparation raw materials in percentage by mass:
5-25% of silicon oxide, 5-15% of magnesium oxide and 60-85% of aluminum oxide;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m;
the metal furnace tube is made of stainless steel.
The ceramic/metal composite furnace tube provided by the invention comprises a metal furnace tube, wherein the metal furnace tube is made of stainless steel, preferably 310S stainless steel, 304 stainless steel or 316L stainless steel, and more preferably 310S stainless steel. In the invention, the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m.
The ceramic/metal composite furnace tube provided by the invention comprises a ceramic layer positioned on the outer surface of the metal furnace tube, wherein the thickness of the ceramic layer is preferably 0.1-0.35 mm, and is further preferably 0.25mm. In the invention, the ceramic layer comprises the following preparation raw materials in percentage by mass: 5-25% of silicon oxide, 5-15% of magnesium oxide and 60-85% of aluminum oxide.
In the present invention, the raw material for preparing the ceramic layer includes 5 to 25% by mass of silicon oxide, preferably 10 to 20%, and more preferably 15%. In the invention, the preparation raw material of the ceramic layer comprises 5-15% by mass of magnesium oxide, preferably 10%. In the present invention, the raw material for preparing the ceramic layer includes 60 to 85 mass% of alumina, preferably 70 to 80 mass%, and more preferably 75 mass%. In the present invention, the particle diameters of the silica, magnesia and alumina are independently preferably 1000 to 1500 mesh.
The ceramic/metal composite furnace tube provided by the invention is preferably provided with an alumina yttrium transition layer between the metal furnace tube and the ceramic layer, and the thickness of the alumina yttrium transition layer is preferably 0.1-0.2 mm, and more preferably 0.15mm. The expansion coefficients of the alumina yttrium transition layer and the metal furnace tube are equivalent, so that cracking is avoided on the basis of ensuring the bonding force between the ceramic layer and the metal furnace tube to be improved.
The invention also provides a preparation method of the ceramic/metal composite furnace tube, which comprises the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
spraying the ceramic material on the outer surface of the metal furnace tube to obtain the ceramic/metal composite furnace tube;
the metal furnace tube is made of stainless steel;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m.
The invention mixes and grinds silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material.
In the present invention, the mass percentages of the silicon oxide, the magnesium oxide, and the aluminum oxide are preferably set according to the above technical solutions, and are not described herein again.
In the present invention, the particle diameters of the silica, magnesia and alumina are independently preferably 1000 to 1500 mesh. The invention does not specifically limit the mixing parameters, as long as the raw materials can be uniformly mixed; the parameters of the grinding are not particularly limited in the present invention, as long as the particle size of the mixed material can be made 200 to 325 mesh. In the present invention, during the mixing and grinding, silica, magnesia and alumina are agglomerated while being mixed. Therefore, the particle size of the mixed material obtained after the mixed grinding is caused to be larger than the primary particle sizes of silica, magnesia and alumina.
After the mixed material is obtained, the mixed material is pre-sintered to obtain the ceramic material.
In the invention, the pre-sintering temperature is preferably 700-800 ℃, and more preferably 750 ℃; the time is preferably 10 to 16 hours, more preferably 13 hours. In the present invention, the calcination is preferably carried out under a nitrogen gas atmosphere.
In the invention, the pre-sintering can improve the structural strength of the ceramic layer, and further improve the strength of the ceramic/metal composite furnace tube.
After the ceramic material is obtained, the ceramic material is sprayed on the outer surface of the metal furnace tube to obtain the ceramic/metal composite tube.
In the present invention, the material and size of the metal furnace tube are the same as those of the above technical solution, and are not described herein again.
In the present invention, the furnace tube is preferably subjected to a pretreatment before being sprayed, and the pretreatment preferably includes: firstly, surface passivation treatment is carried out, and then surface purification treatment is carried out. The operation of the surface passivation treatment and the surface purification treatment in the present invention is not particularly limited, and the surface passivation treatment and the surface purification treatment known to those skilled in the art may be used.
In the present invention, the spraying is preferably plasma thermal spraying; the parameters of the plasma thermal spray preferably include: the current is 550-600A, and particularly preferably 600A; the voltage is 60 to 90V, more preferably 70 to 80V, and particularly preferably 90V; the spraying distance is 30 to 50mm, more preferably 35 to 45mm, and still more preferably 40mm.
In the invention, when the ceramic/metal composite furnace tube comprises the alumina yttrium transition layer, the preparation method of the ceramic/metal composite furnace tube comprises the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
and spraying an alumina yttrium material and a ceramic material on the outer surface of the metal furnace tube in sequence to obtain the ceramic/metal composite furnace tube.
In the present invention, the methods of "mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material", "pre-burning the mixed material to obtain a ceramic material", and "spraying the ceramic material" are consistent with the above technical solutions, and are not described herein again.
In the invention, the method for spraying the alumina yttrium material is preferably plasma thermal spraying; the plasma thermal spray preferably includes the following parameters: the current is 550-600A, and the specific preference is 550A; the voltage is 60 to 90V, more preferably 70 to 80V, and particularly preferably 60V; the spraying distance is 30 to 50mm, more preferably 35 to 45mm, and particularly preferably 35mm.
The invention also provides application of the ceramic/metal composite furnace tube in the technical scheme or the ceramic/metal composite furnace tube obtained by the preparation method in the technical scheme in sintering corrosive materials.
In the invention, because the outermost layer of the ceramic/metal composite furnace tube provided by the invention is the ceramic layer, the inertia of the ceramic layer ensures that the ceramic/metal composite furnace tube cannot be corroded when corrosive materials are sintered, thereby expanding the application range of the metal furnace tube.
The ceramic/metal composite furnace tube and the preparation method and application thereof provided by the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The ceramic layer comprises the following preparation raw materials in percentage by mass:
15% of silicon oxide, 10% of magnesium oxide and 75% of aluminum oxide;
mixing silicon oxide, magnesium oxide and aluminum oxide, and carrying out mixing grinding to obtain a mixed material (the particle size is 275 meshes);
pre-burning the mixed material for 13 hours at 750 ℃ in a nitrogen atmosphere to obtain a ceramic material;
carry out passivation treating and surface cleaning with the metal furnace pipe (internal diameter is 300mm, and the wall thickness is 4mm, and length is 800 mm) that the material is 310S stainless steel, plasma thermal spraying alumina yttrium and ceramic material in proper order on the metal furnace pipe surface, and then form transition layer and ceramic layer, the plasma thermal parameter of alumina yttrium includes: the current is 550A, the voltage is 60V, the spraying distance is 35mm, and the plasma thermal parameters of the ceramic material comprise: the current is 600A, the voltage is 90V, and the spraying distance is 40mm; and obtaining the ceramic/metal composite furnace tube, wherein the thickness of the ceramic layer is 0.25mm, and the thickness of the alumina yttrium transition layer is 0.15mm.
And (3) taking lithium carbonate with relatively high hardness as a friction medium, putting the obtained ceramic/metal composite furnace tube into a rotating tube to work at the speed of 2r/min, and taking out a sample after 72 hours to perform content detection.
Performing 30 times of circulating operation by using the steps, and taking out a sample for content detection and thickness detection; the results were: the composition content and the thickness of the ceramic layer are not changed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (6)
1. A ceramic/metal composite furnace tube is characterized by comprising a metal furnace tube and a ceramic layer attached to the outer surface of the metal furnace tube; the ceramic layer comprises the following preparation raw materials in percentage by mass:
5-25% of silicon oxide, 5-15% of magnesium oxide and 60-85% of aluminum oxide;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m;
the metal furnace tube is made of stainless steel;
the metal furnace tube is made of 310S stainless steel, 304 stainless steel or 316L stainless steel;
an alumina yttrium transition layer is arranged between the metal furnace tube and the ceramic layer;
the preparation method of the ceramic/metal composite furnace tube comprises the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
sequentially spraying an alumina yttrium material and a ceramic material on the outer surface of the metal furnace tube to obtain the ceramic/metal composite furnace tube;
the pre-sintering temperature is 700-800 ℃, and the time is 10-16 h.
2. The ceramic/metal composite furnace tube of claim 1, wherein the ceramic layer has a thickness of 0.1-0.35 mm.
3. The ceramic/metal composite furnace tube of claim 1, wherein the thickness of the alumina yttrium transition layer is 0.1-0.2 mm.
4. The method for preparing the ceramic/metal composite furnace tube of any one of claims 1 to 3, characterized by comprising the following steps:
mixing and grinding silicon oxide, magnesium oxide and aluminum oxide to obtain a mixed material;
pre-burning the mixed material to obtain a ceramic material;
sequentially spraying an alumina yttrium material and a ceramic material on the outer surface of the metal furnace tube to obtain the ceramic/metal composite furnace tube;
the metal furnace tube is made of stainless steel;
the inner diameter of the ceramic/metal composite furnace tube is less than or equal to 1.5m, and the length of the ceramic/metal composite furnace tube is less than or equal to 12m;
the pre-sintering temperature is 700-800 ℃, and the time is 10-16 h.
5. The production method according to claim 4, wherein the spraying is plasma thermal spraying; the parameters of the plasma thermal spraying include: the current is 550-600A, the voltage is 60-90V, and the spraying distance is 30-50 mm.
6. Use of the ceramic/metal composite furnace tube according to any one of claims 1 to 3 or the ceramic/metal composite furnace tube obtained by the preparation method according to any one of claims 4 to 5 for sintering corrosive materials.
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