CN110028313B - Corundum crucible and preparation method thereof - Google Patents

Corundum crucible and preparation method thereof Download PDF

Info

Publication number
CN110028313B
CN110028313B CN201910412069.8A CN201910412069A CN110028313B CN 110028313 B CN110028313 B CN 110028313B CN 201910412069 A CN201910412069 A CN 201910412069A CN 110028313 B CN110028313 B CN 110028313B
Authority
CN
China
Prior art keywords
corundum
parts
spinel
crucible
andalusite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910412069.8A
Other languages
Chinese (zh)
Other versions
CN110028313A (en
Inventor
孙华云
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Vocational College of Industry
Original Assignee
Shandong Vocational College of Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Vocational College of Industry filed Critical Shandong Vocational College of Industry
Priority to CN201910412069.8A priority Critical patent/CN110028313B/en
Publication of CN110028313A publication Critical patent/CN110028313A/en
Application granted granted Critical
Publication of CN110028313B publication Critical patent/CN110028313B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • 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
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium 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
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • 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
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • 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
    • C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
    • C04B2235/3481—Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
    • 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
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • 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
    • C04B2235/65—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
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • 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
    • Y02P10/20—Recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A corundum crucible and a preparation method thereof belong to the technical field of induction furnacesA domain. The formula is characterized by comprising the following raw materials in parts by weight: 60-70 parts of corundum, 20-25 parts of spinel, 3-8 parts of activated alumina, 2-5 parts of fused magnesia, 5-10 parts of andalusite and 5-8 parts of a binding agent. SiO formed by decomposing andalusite introduced into the corundum crucible of the invention2With Al in fine corundum sand powder and alumina micropowder2O3And a mullite network is formed by reactive sintering and is inserted among the alumina aggregates, so that the thermal shock resistance and the strength of the product are improved. The introduction of the alumina micro powder and the andalusite micro powder leads the mullite temperature to be advanced to less than 1000 ℃, and the product has stronger medium-high temperature strength. The spinel introduced into the matrix and the spinel formed in situ have enhanced resistance to corrosion and permeability of alkaline slag.

Description

Corundum crucible and preparation method thereof
Technical Field
A corundum crucible and a preparation method thereof belong to the technical field of induction furnaces.
Background
With the development of domestic induction furnaces towards high efficiency, rapid melting and large-scale production, the requirements of furnace lining materials are more and more strict. The crucible is an important component of a high-temperature induction furnace in the precision casting industry and is a container for melting and refining molten steel. The crucible is in direct contact with high-temperature molten steel, slag and gas for a long time, and is easy to erode and damage, and the molten steel can be polluted. The metal smelting is an intermittent operation process, and the crucible is periodically subjected to heating and cooling, so that cracks and even peeling are easily generated, and the steel is infiltrated to damage the crucible. Therefore, the crucible should have good thermal shock resistance, erosion resistance and chemical stability to improve the service life and reduce the smelting cost. At present, the service life of the induction furnace crucible is shorter, the imported products are generally about 100 furnaces, and the cost is higher.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides a corundum crucible which is high temperature resistant, high in strength, high in compactness, small in thermal expansion rate and resistant to slag and molten steel corrosion and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the corundum crucible is characterized by comprising the following raw materials in parts by weight: 60-70 parts of corundum, 20-25 parts of spinel, 3-8 parts of activated alumina, 2-5 parts of fused magnesia, 5-10 parts of andalusite and 5-8 parts of a binding agent.
SiO formed by decomposing andalusite introduced into the corundum crucible of the invention2With AL in fine corundum sand powder and fine alumina powder2O3And a mullite network is formed by reactive sintering and is inserted among the alumina aggregates, so that the thermal shock resistance and the strength of the product are improved. The introduction of alumina micropowder and andalusite micropowder advances the mullite temperature to less than 1000 ℃, so that the product has stronger medium-high temperature strength.
Preferably, the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, mixed corundum of 1-0mm tabular corundum and 240-mesh corundum sand, and the mass ratio of 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum to 240-mesh corundum sand is 10:24:10: 3. The optimized corundum type and particle grading can ensure that the corundum crucible is more compact and high in strength.
Preferably, the activated alumina is ambel CL 370C.
Preferably, the fused magnesia is 98 fused magnesia with the granularity of 0.5-0 mm. The optimized type and particle grading of the fused magnesia can ensure that the corundum crucible is more compact and high in strength.
The spinel is 100-mesh 70-mesh electric melting magnesia-alumina spinel and 90-sintered aluminum-rich spinel micro powder.
Preferably, the andalusite is 200-mesh andalusite fine powder.
Preferably, the binding agent is a mixture of the Laplace cement SECAR-71, sodium tripolyphosphate, organic binding agent gum water and water, and the mass ratio of the Laplace cement SECAR-71, the sodium tripolyphosphate, the organic binding agent gum water to the water is 0.2-0.5: 0.15 to 0.2: 3-5: 5 to 6. The invention provides a bonding agent with unique composition and proportion, which can tightly bond raw materials in the calcining process, and greatly improve the thermal shock resistance stability and the mechanical property.
A preparation method of a corundum crucible is characterized by comprising the following preparation steps:
1) preparing various fine powder raw materials into mixed powder according to a ratio for later use;
2) brushing a release agent on a crucible mold, fixing, and placing on a vibration table for later use;
3) sequentially putting the granules, the bonding agent and the mixed powder into a stirrer for stirring, and discharging after uniform mixing;
4) opening a vibrating table, injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18-24h, demolding to obtain a semi-finished product, and controlling the density of a wet blank to be more than or equal to 2.8g/cm3；
5) Drying for 24-48 h at 50-110 ℃, wherein the residual water content of the dried blank is less than or equal to 0.5%; firing at 1570-1630 ℃ for 6-9 h.
The preparation method of the invention has better collocation with the raw materials and ensures the yield and the performance of the crucible.
Preferably, in the step 5), drying is carried out for 24-26 h at the temperature of 70-80 ℃.
Preferably, in the step 5), the sintering is carried out at 1590-1610 ℃ for 7-8 h.
The product quality is better under the preferred preparation conditions.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a corundum-spinel-mullite crucible for a high-temperature induction furnace in precision casting industry. SiO formed by decomposing andalusite fine powder introduced into the corundum crucible of the invention2With AL in fine corundum sand powder and fine alumina powder2O3And a mullite network is formed by reactive sintering and is inserted among the alumina aggregates, so that the thermal shock resistance and the strength of the product are improved. The introduction of alumina micropowder and andalusite micropowder advances the mullite temperature to less than 1000 ℃, so that the product has stronger medium-high temperature strength. The melting points of mullite and magnesia-alumina spinel are 1819 ℃ and 2135 ℃, the magnesia-alumina spinel (MA) belongs to a cubic system and the mullite belongs to an orthorhombic system, and the thermal expansion coefficient and the elastic modulus of the mullite and the magnesia-alumina spinel are different (the thermal expansion coefficient of the spinel is 7.6 multiplied by 10)-6Per DEG C, the coefficient of thermal expansion of mullite is 5.3X 10-6/° c), so that the addition of mullite to the spinel material can play a role in complex phase toughening, and the spinel material have high melting point, very low thermal expansion, high thermal shock resistance and slag erosion resistance.
The fused magnesia and AL introduced into the corundum crucible of the invention2O3The in-situ spinel generated by the reaction is distributed more uniformly in the matrix, absorbs FeO and MnO in the slag to form a solid solution, can effectively prevent the penetration of FeO and MnO in the slag, and improves the slag resistance.
The CL370C introduced into the corundum crucible of the invention replaces the common alumina micro powder, has good water reducing effect and improves the high-temperature strength of the crucible.
The process of the invention adopts a gypsum mould for molding. The slurry is poured and vibrated at the same time, so that the slurry is filled in the whole die space, the product size is accurate, the die is not deformed, the processing is easy, and the manufacturing cost is low. The cement solidification process overcomes the defect of slow slurry absorption and drainage in the later period of gypsum, shortens the demolding time and improves the molding speed.
The corundum crucible is compact and high in strength, and has obviously improved erosion resistance, thermal shock resistance, mechanical property and long service life. The alloy can bear molten steel at more than 1600 ℃, resist high temperature, does not peel off, resist molten steel, has good slag corrosion resistance, does not pollute molten steel, can be used for more than 200 furnaces, and is stable to use in the fields of precision casting and metallurgical industry.
Detailed Description
The invention is further illustrated by the following specific examples, of which example 1 is the best mode of practice.
Example 1
1. Preparing materials: 65 parts of corundum, 22 parts of spinel, 5 parts of activated alumina, 3 parts of fused magnesia, 3 parts of spinel, 8 parts of andalusite and 6.5 parts of a bonding agent; the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum, and the mass ratio of 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum is 10:24:10: 3; the activated alumina is Anmai CL 370C; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0mm, and the spinel is 70 fused magnesia-alumina spinel of 100 meshes and 90 sintered aluminum-rich spinel micro powder; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-based cement SECAR-71, sodium tripolyphosphate, organic binding agent gum water and water, and the mass ratio of the Laval-based cement SECAR-71 to the sodium tripolyphosphate to the organic binding agent gum water to the water is 0.3: 0.18: 4: 5.5;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mould, brushing a release agent on a crucible mould, fixing, and placing on a vibration table for later use;
(3) putting the corundum particles and the magnesia particles into a stirrer, and mixing for 6 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 4 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 15min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18 hours, then demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: the density of the wet blank is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executing according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and firing
4.1, drying for 24 hours at 75 ℃ until the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling temperature rise according to a temperature rise curve, and roasting at 1600 ℃ for 8 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
Example 2
1. Preparing materials: 60 parts of corundum, 25 parts of spinel, 3 parts of activated alumina, 5 parts of fused magnesia, 5 parts of spinel, 5 parts of andalusite and 8 parts of bonding agent; the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum, 240-mesh corundum, 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum, and the mass ratio is 10:24:10: 3; the activated alumina is Anmai CL 370C; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0mm, and the spinel is 70 fused magnesia-alumina spinel of 100 meshes and 90 sintered aluminum-rich spinel micro powder; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-base cement SECAR-71, sodium tripolyphosphate, organic binding agent tree glue and water, and the mass ratio of the Laval-base cement SECAR-71, the sodium tripolyphosphate, the organic binding agent gum water to the water is 0.2: 0.2: 3: 6;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mould, brushing a release agent on a crucible mould, fixing, and placing on a vibration table for later use;
(3) putting corundum particles and magnesia particles into a stirrer, and mixing for 5 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 5 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 10min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 20 hours, then demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: the density of the wet blank is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executed according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and baking
4.1, drying at 70 ℃ for 26 hours until the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling the temperature rise according to a temperature rise curve, and roasting at 1610 ℃ for 7 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
Example 3
1. Preparing materials: 70 parts of corundum, 20 parts of spinel, 8 parts of activated alumina, 2 parts of fused magnesia, 2 parts of spinel, 10 parts of andalusite and 5 parts of a bonding agent; the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum, 240-mesh corundum, 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum, and the mass ratio is 10:24:10: 3; the activated alumina is Anmai CL 370C; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0mm, and the spinel is 70 fused magnesia-alumina spinel of 100 meshes and 90 sintered aluminum-rich spinel micro powder; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-base cement SECAR-71, sodium tripolyphosphate, organic binding agent tree glue and water, and the mass ratio of the Laval-base cement SECAR-71 to the sodium tripolyphosphate to the organic binding agent tree glue to the water is 0.5: 0.15: 5: 5;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mould, brushing a release agent on a crucible mould, fixing, and placing on a vibration table for later use;
(3) putting corundum particles and magnesia particles into a stirrer, and mixing for 8 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 3 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 20min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 24 hours, then demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: wet blankThe volume density is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executing according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and baking
4.1, drying for 24 hours at the temperature of 80 ℃, wherein the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling temperature rise according to a temperature rise curve, and roasting at 1590 ℃ for 8 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
Example 4
1. Preparing materials: 62 parts of corundum, 24 parts of spinel, 4 parts of activated alumina, 4 parts of fused magnesia, 4 parts of spinel, 6 parts of andalusite and 7 parts of a bonding agent; the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum, 240-mesh corundum, 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum, and the mass ratio is 10:10:10: 10; the activated alumina is Anmai CL 370C; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0mm, and the spinel is 70 fused magnesia-alumina spinel of 100 meshes and 90 sintered aluminum-rich spinel micro powder; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-base cement SECAR-71, sodium tripolyphosphate, organic binding agent tree glue and water, and the mass ratio of the Laval-base cement SECAR-71 to the sodium tripolyphosphate to the organic binding agent tree glue to the water is 0: 1: 0.3: 8: 6;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mold, brushing a release agent on a crucible mold, fixing, and placing on a vibration table for later use;
(3) putting the corundum particles and the magnesia particles into a stirrer, and mixing for 6 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 4 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 15min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, vibrating while feeding, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18-24h, then demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: the density of the wet blank is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executing according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and baking
4.1, drying for 48 hours at 50 ℃ until the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling the temperature rise according to a temperature rise curve, and roasting at 1630 ℃ for 6 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
Example 5
1. Preparing materials: 68 parts of corundum, 22 parts of spinel, 7 parts of activated alumina, 3 parts of fused magnesia, 3 parts of spinel, 9 parts of andalusite and 6 parts of a bonding agent; the corundum is 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum, 240-mesh corundum, 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240-mesh corundum, and the mass ratio is 24:10:3: 10; the activated alumina is Anmai CL 370C; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0mm, and the spinel is 70 fused magnesia-alumina spinel of 100 meshes and 90 sintered aluminum-rich spinel micro powder; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-base cement SECAR-71, sodium tripolyphosphate, organic binding agent tree glue and water, and the mass ratio of the Laval-base cement SECAR-71, the sodium tripolyphosphate, the organic binding agent tree glue to the water is 0.15: 0.6: 6: 5;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mould, brushing a release agent on a crucible mould, fixing, and placing on a vibration table for later use;
(3) putting corundum particles and magnesia particles into a stirrer, and mixing for 7 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 4 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 18min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18-24h, demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: the density of the wet blank is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executing according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and baking
4.1, drying for 24 hours at 110 ℃, wherein the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling the temperature rise according to a temperature rise curve, and roasting at 1570 ℃ for 9 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
Example 6
1. Preparing materials: 65 parts of corundum, 22 parts of spinel, 5 parts of activated alumina, 3 parts of fused magnesia, 3 parts of spinel, 8 parts of andalusite and 6.5 parts of a bonding agent; the corundum is 3-1mm tabular corundum and 1-0mm tabular corundum, and the mass ratio of the 3-1mm tabular corundum to the 1-0mm tabular corundum is 10: 10; the fused magnesia is 98 fused magnesia with the granularity of 0.5-0 mm; andalusite is 200 meshes of andalusite fine powder; the binding agent is Laval-based cement SECAR-71, sodium tripolyphosphate, organic binding agent gum water and water, and the mass ratio of the Laval-based cement SECAR-71 to the sodium tripolyphosphate to the organic binding agent gum water to the water is 0.15: 0.6: 6: 5;
blending fine powder: firstly adding corundum fine powder, 370C micro powder, spinel fine powder and micro powder, calcium aluminate cement and tabular corundum fine powder into a spiral stirrer for dry mixing for 20 minutes to prepare mixed powder for later use;
2. stirring material
(1) Measuring tree glue and standing for later use; weighing a water reducing agent, placing the water reducing agent in water, stirring the water reducing agent until the water reducing agent is completely dissolved, and standing the water reducing agent for later use;
(2) preparing a gypsum mould, brushing a release agent on a crucible mould, fixing, and placing on a vibration table for later use;
(3) putting the corundum particles and the magnesia particles into a stirrer, and mixing for 6 min;
(4) pouring the solution in the step (1) into a stirrer, and continuously stirring for 4 min;
(5) then putting the mixed fine powder into a stirrer, stirring for 15min, controlling the moisture of the pug, and discharging after uniform mixing;
3. shaping of
3.1 casting and molding gypsum model coarse particles: opening a vibrating table, slowly injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18 hours, then demolding, and obtaining a semi-finished product after demolding;
3.2 wet blank control parameters: the density of the wet blank is more than or equal to 2.8g/cm3；
3.3 the requirements of the semi-finished product on appearance quality are as follows:
3.3.1 dimensional tolerance: executing according to the relevant provisions of the user;
3.3.2 the semi-finished product has regular, smooth and crack-free appearance;
4. drying and baking
4.1, drying for 24 hours at 75 ℃ until the residual water content of the dried blank is less than or equal to 0.5 percent;
4.2 firing System: roasting in a shuttle kiln, controlling temperature rise according to a temperature rise curve, and roasting at 1600 ℃ for 8 hours;
4.3 the finished crucible product has white appearance, uniform wall thickness, no crack and no spot.
The results of the performance test of the crucibles obtained in the examples are shown in Table 1.
TABLE 1
Figure 489453DEST_PATH_IMAGE001
。
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (2)

1. The preparation method of the corundum crucible is characterized by comprising the following raw materials in parts by weight: 60-70 parts of corundum, 20-25 parts of spinel, 3-8 parts of activated alumina, 2-5 parts of fused magnesia, 5-10 parts of andalusite and 5-8 parts of a binding agent;
the corundum is mixed corundum of 6-3mm tabular corundum, 3-1mm tabular corundum, 1-0mm tabular corundum and 240 meshes of corundum sand, and the mass ratio of the 6-3mm tabular corundum, the 3-1mm tabular corundum, the 1-0mm tabular corundum and the 240 meshes of corundum sand is 10:24:10: 3;
the preparation steps are as follows:
1) preparing various fine powder raw materials into mixed powder according to a ratio for later use;
2) brushing a release agent on a crucible mold, fixing, and placing on a vibration table for later use; the crucible mold is a gypsum mold;
3) sequentially putting the granules, the bonding agent and the mixed powder into a stirrer for stirring, and discharging after uniform mixing;
4) opening a vibrating table, injecting the stirred material into a crucible mold, feeding while vibrating, continuously vibrating to discharge air after the mold is filled with the material, closing the vibrating table, curing for 18-24h, demolding to obtain a semi-finished product, and controlling the density of a wet blank to be more than or equal to 2.8g/cm3；
5) Drying for 24-48 h at 50-110 ℃ until the residual water content of the dried blank is less than or equal to 0.5%; firing at 1570-1630 ℃ for 6-9 h;
the binding agent is a mixture of Laval-base cement SECAR-71, sodium tripolyphosphate, organic binding agent gum water and water, wherein the mass ratio of the Laval-base cement SECAR-71 to the sodium tripolyphosphate to the organic binding agent gum water to the water is 0.2-0.5: 0.15-0.2: 3-5: 5-6;
the activated alumina is Anmai CL 370C;
the fused magnesia is 98 fused magnesia with the granularity of 0.5-0 mm;
the andalusite is 200-mesh andalusite fine powder;
the spinel is 100-mesh 70-mesh electric melting magnesia-alumina spinel, and 90-sintered rich-aluminum spinel micro powder.
2. A method of preparing a corundum crucible as defined in claim 1, wherein: firing at 1590-1610 ℃ for 7-8 h in the step 5).
CN201910412069.8A 2019-05-17 2019-05-17 Corundum crucible and preparation method thereof Active CN110028313B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910412069.8A CN110028313B (en) 2019-05-17 2019-05-17 Corundum crucible and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910412069.8A CN110028313B (en) 2019-05-17 2019-05-17 Corundum crucible and preparation method thereof

Publications (2)

Publication Number Publication Date
CN110028313A CN110028313A (en) 2019-07-19
CN110028313B true CN110028313B (en) 2022-06-03

Family

ID=67242471

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910412069.8A Active CN110028313B (en) 2019-05-17 2019-05-17 Corundum crucible and preparation method thereof

Country Status (1)

Country Link
CN (1) CN110028313B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114213109B (en) * 2021-12-30 2023-03-10 辽宁省轻工科学研究院有限公司 High-precision and high-strength ceramic hand mold and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102531645A (en) * 2011-11-22 2012-07-04 中山市华山特种陶瓷有限公司 Corundum Calcium Magnesium Aluminum Spinel Crucible
CN103121850B (en) * 2012-07-04 2015-04-15 河南熔金高温材料股份有限公司 Non-cement-bound corundum fabricated part and production method thereof
CN104250099B (en) * 2013-06-25 2018-07-20 上海宝钢工业技术服务有限公司 Al2O3- MgO refractory casting materials and preparation method thereof
CN103482989B (en) * 2013-09-06 2014-12-10 浙江自立股份有限公司 Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable

Also Published As

Publication number Publication date
CN110028313A (en) 2019-07-19

Similar Documents

Publication Publication Date Title
CN105645979B (en) A kind of air brick of steel ladle and preparation method thereof
CN102718512A (en) Thermal-shock-resistant corundum-spinel refractory castable and preparation method thereof
CN110078484B (en) Corundum-mullite crucible and preparation method thereof
CN105645977A (en) Air brick for special steel refining and preparation method thereof
CN111362674B (en) Acid-resistant corundum ramming mass and method for manufacturing acid regenerator nozzle by using same
CN111410519B (en) Aluminum titanate-added Al 2 O 3 -C sliding brick and production method thereof
CN106518043B (en) The preparation method of the siliceous bottom brick of molten tin bath of low-cost aluminum calcium
CN104193370B (en) A kind of preparation method of ladle carbon free precast block
CN104073673A (en) Preparation method of ceramic reinforced metal-based composite material
CN110028313B (en) Corundum crucible and preparation method thereof
CN110386808A (en) A kind of resistance to erosion AluminaSpinel Bricks and preparation method thereof
CN102584249B (en) Method for preparing thin-walled ceramic crucible
CN109095902B (en) Paving brick for glass kiln and production process thereof
CN107602137B (en) Inner nozzle brick of steel tapping hole of cast-molded converter and preparation method thereof
CN106083005A (en) High porosity easily removes silicon-base ceramic core preparation method
CN104692812A (en) A preparing method of a ternary-material lithium battery saggar
CN105272276B (en) A kind of Copper making chute castable
CN112094127B (en) Manufacturing process of kyanite tailing series sagger
CN113045299A (en) Machine-pressed carbon-free steel ladle brick containing composite binder and preparation method thereof
CN103011823A (en) Ceramic crucible for galvanizing furnace and production method thereof
CN113620704A (en) Preparation process of high-zirconium ceramic for special glass molten pool
CN113683426A (en) Baking-free high-strength metal ceramic composite material and preparation method and application thereof
KR100463921B1 (en) Alumina based ceramic filter for casting and method of producing the same
CN113233880A (en) Ladle castable for integral casting and preparation method thereof
CN112759381A (en) Carbon-free ladle down nozzle and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Sun Huayun

Inventor before: Sun Huayun

Inventor before: Yu Lehai

Inventor before: Li Mingjing

GR01 Patent grant
GR01 Patent grant