CN107935570A - A kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof - Google Patents
A kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof Download PDFInfo
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- CN107935570A CN107935570A CN201711247550.3A CN201711247550A CN107935570A CN 107935570 A CN107935570 A CN 107935570A CN 201711247550 A CN201711247550 A CN 201711247550A CN 107935570 A CN107935570 A CN 107935570A
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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
- C04B35/101—Refractories from grain sized mixtures
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- 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
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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
- 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
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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
- 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
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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
- 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
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Abstract
A kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof, raw material are electric smelting or sintering spinelle sand and modified water glass, and magnesium aluminate spinel sand is divided into 5 ~ 3 mm, 3 ~ 1 mm ,≤1 mm, tri- kinds of granularmetric compositions, consisting of MgO+Al2O3≥90%.Modified water glass modulus is 2.4 ~ 3.0, and modifying agent is polyacrylamide or sodium tripolyphosphate.Raw material is weighed by proportioning, batch mixing, add modified water glass, stirring carries out artificial or mechanical-moulded after discharging, it is stand-by that at 180 ~ 260 DEG C sand mold base is organized mould on request after dry 8 ~ 24h.The castable refractory casting sand type material sand mold refractoriness of the present invention is high, and high-temperature behavior is good, and thermal shock resistance is strong, does not pollute casting, can significantly improve sand mold collapsibility and surface stability, have good workability, easy construction, sand mold good integrity.
Description
Technical field
The present invention relates to a kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof, belongs to inorganic non-gold
Belong to material subject fire resisting material field.
Background technology
Sand mold is critical material prepared by castable refractory, and the quality of sand mold directly affects fusion-cast refractory after cast molding
The quality of material, castable refractory require to include sand mold：First, enough refractoriness, can resist rushing for high-temperature fusant
Brush；2nd, certain normal temperature strength and elevated temperature strength, ensure the assembling and transport of sand mold template, ensure sand mold in casting cycle
Globality；3rd, good collapsibility, beneficial to the demoulding, non-sticky sand.Currently used sand mold mainly has four classes：One is waterglass knot
Silica sand is closed, easily fabricated as described by patent CN102341550B, cost is low, but collapsibility is poor, makes low precision, appearance
It is of poor quality；Two be resin bonded sand mould；Exempt to toast, air set, high temperature is defeated and dispersed, and dimensional accuracy is high, but resin burning production during casting
Raw a large amount of gases, pollute environment, while influence product colour；Three be magnesia sand mold, as described in patent CN100381400C, high temperature
Performance is good, and thermal shock resistance is strong, does not pollute oxidation aluminium casting, but cost is higher；Four be graphite sand mould：Refractoriness is high, processing
Precision is high, and scale error is small, easy High temperature release, reusable, but of high cost, poor air permeability.
The content of the invention
It is an object of the invention to develop a kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof, with
Meet requirement prepared by founding aluminium oxide refractory material production.
One kind production founding aluminium oxide refractory material spinelle sand mould material, raw material is electric smelting or sintering spinelle sand,
Additional modified water glass, is expressed as according to mass percent：
（1）The magnesium aluminate spinel 10 ~ 30% of 5 ~ 3 mm of granularity；
（2）The magnesium aluminate spinel 30 ~ 65% of 3 ~ 1 mm of granularity；
（3）The magnesium aluminate spinel 30 ~ 60% of the mm of granularity≤1；
（4）Modified water glass 3 ~ 8%；
The magnesium aluminate spinel sandy plain material is electric smelting or sand burning, its weight composition is：MgO+Al2O3≥90%。
The modified water glass, modifying agent are polyacrylamide or sodium tripolyphosphate, according to weight ratio 1 under room temperature：7~10
Ratio be added in water glass solution, stand 24 it is small when after can use.Modified modulus of water glass is 2.4 ~ 3.0.
It is described it is a kind of produce the preparation method of founding aluminium oxide refractory material spinelle sand mould material, including weigh original
Material, material mixing, molding, drying and group mould, the raw material for meeting above-mentioned granularity and component requirements match weighed on request, stirring
Batch mixing 1 ~ 3 minute in machine, adds a certain proportion of modified water glass, continues stirring 3 ~ 5 minutes, will according to template size after discharging
Ask and be manually or mechanically molded, the drying be by sand mold base at 180 ~ 260 DEG C dry 8 ~ 24h, it is dry after group on request
Mould is stand-by.
The novelty of the present invention is：Magnesium aluminate spinel has good high temperature resistant, good chemical stability, and mechanical performance is excellent
Good, high fusing point（>2000℃）The advantages that, the quality raw materials of founding aluminium oxide refractory material sand mold are may be used as, it is modified at the same time
Waterglass overcomes the shortcomings that traditional waterglass, it has technical effect that：
（1）Modified water glass combination magnesium aluminate spinel sand mold refractoriness is high, and high-temperature behavior is good, and thermal shock resistance is strong, does not pollute
Casting；
（2）Modified water glass combination magnesium aluminate spinel sand mold can be effectively reduced the dosage of waterglass, than traditional waterglass knot
Closing reduces by 20 ~ 50%, significantly improves the collapsibility and surface stability of sand mold, it is possible to achieve the recycling of sand mold；
（3）Modified water glass combination magnesium aluminate spinel sand mold has good workability, it is ensured that the construction time of 15 ~ 50 minutes, construction
Simplicity, sand mold good integrity.
Embodiment
Embodiment 1
In terms of weight percentage, raw material is：The sintering magnesium aluminate spinel 15% of 5 ~ 3mm, the sintering magnesium aluminate spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 40% of 45% ,≤1mm, sinter the MgO+Al of spinelle2O3Content is 92.4%, the MgO+ of electric smelting spinelle
Al2O3Content is 94.5%；The outer dosage of modified water glass is 5%, and modified water glass is using polyacrylamide under room temperature according to weight
Than 1:10 ratio is added in water glass solution, stand 24 it is small when after use.Modified modulus of water glass is 2.7.Will be upper
To state magnesium aluminate spinel and match on request and weighed, batch mixing 1 minute in mixer, adds the modified water glass of 5% weight ratio,
Continue stirring 3 minutes, be manually or mechanically molded according to template size requirement after discharging, the dry 8h at 220 DEG C, after dry
It is stand-by that mould is organized on request.Its performance indicator see the table below 1：
Embodiment 2
In terms of weight percentage, raw material is：The sintering magnesium aluminate spinel 10% of 5 ~ 3mm, the electric melting magnesium aluminum spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 45% of 45% ,≤1mm, sinter the MgO+Al of spinelle2O3Content is 91.4%, the MgO+ of electric smelting spinelle
Al2O3Content is 93.8%；The outer dosage of modified water glass is 7%, and modified water glass is using sodium tripolyphosphate under room temperature according to weight
Than 1:7 ratio is added in water glass solution, stand 24 it is small when after use.Modified modulus of water glass is 2.9.Will be above-mentioned
Magnesium aluminate spinel matches weighed on request, batch mixing 2 minutes in mixer, adds the modified water glass of 7% weight ratio, after
Continuous stirring 3 minutes, is manually or mechanically molded after discharging according to template size requirement, the dry 12h at 240 DEG C, after dry
It is stand-by that mould is organized on request.Its performance indicator see the table below 2：
Embodiment 3
In terms of weight percentage, raw material is：The electric melting magnesium aluminum spinel 12% of 5 ~ 3mm, the electric melting magnesium aluminum spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 33% of 55% ,≤1mm, the MgO+Al of electric smelting spinelle2O3Content is 92.7%；Modified water glass it is additional
Measure as 4%, modified water glass uses under room temperature polyacrylamide according to weight ratio 1:8 ratio is added in water glass solution, quiet
Put 24 it is small when after use.Modified modulus of water glass is 2.8.Above-mentioned magnesium aluminate spinel is matched on request and is weighed,
Batch mixing 2 minutes in mixer, add the modified water glass of 4% weight ratio, continue stirring 2 minutes, will according to template size after discharging
Ask and be manually or mechanically molded, the dry 16h at 180 DEG C, it is stand-by to organize mould on request after dry.Its performance indicator see the table below 3：
Embodiment 4
In terms of weight percentage, raw material is：The electric melting magnesium aluminum spinel 20% of 5 ~ 3mm, the electric melting magnesium aluminum spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 35% of 45% ,≤1mm, the MgO+Al of electric smelting spinelle2O3Content is 95.7%；Modified water glass it is additional
Measure as 6%, modified water glass uses under room temperature polyacrylamide according to weight ratio 1:7 ratio is added in water glass solution, quiet
Put 24 it is small when after use.Modified modulus of water glass is 2.5.Above-mentioned magnesium aluminate spinel is matched on request and is weighed,
Batch mixing 1 minute in mixer, adds the modified water glass of 6% weight ratio, continues stirring 3 minutes, will according to template size after discharging
Ask and be manually or mechanically molded, the dry 10h at 260 DEG C, it is stand-by to organize mould on request after dry.Its performance indicator see the table below 4：
Above example is used for the method and core concept for understanding the present invention, for those skilled in the art, is not taking off
On the premise of present inventive concept, any possible change or replacement are carried out, belong to protection scope of the present invention.
Comparative example 1
In terms of weight percentage, raw material is：The electric melting magnesium aluminum spinel 12% of 5 ~ 3mm, the electric melting magnesium aluminum spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 33% of 55% ,≤1mm, the MgO+Al of electric smelting spinelle2O3Content is 92.7%；Commonly waterglass is additional
Measure as 10%, common modulus of water glass is 2.8.Above-mentioned magnesium aluminate spinel is matched on request and is weighed, the batch mixing in mixer
2 minutes, the common waterglass of 10% weight ratio is added, continues stirring 2 minutes, requires to carry out manually according to template size after discharging
Or it is mechanical-moulded, the dry 16h at 180 DEG C, it is stand-by to organize mould on request after dry.Its performance indicator see the table below 5：
This comparative example is since bonding agent is using common waterglass, during in order to ensure the early strength of sand mold and construction
Between, it is necessary to increase the usage amount of bonding agent, reached 10%, but due to excessive waterglass addition, cause in casting cycle
Sand mold produces excessive eutectic and sinters, and remaining flexural strength is excessive, causes the collapsibility of sand mold after casting poor, reduces at the same time
The refractoriness of sand mold, causes the thermal-shock resistance degradation of sand mold, influences the casting of product.
Comparative example 2
In terms of weight percentage, raw material is：The electric melting magnesium aluminum spinel 20% of 5 ~ 3mm, the electric melting magnesium aluminum spinel of 3 ~ 1 mm
The electric melting magnesium aluminum spinel 35% of 45% ,≤1mm, the MgO+Al of electric smelting spinelle2O3Content is 95.7%；Modified water glass it is additional
Measure as 2%, modified water glass uses under room temperature polyacrylamide according to weight ratio 1:7 ratio is added in water glass solution, quiet
Put 24 it is small when after use.Modified modulus of water glass is 2.5.Above-mentioned magnesium aluminate spinel is matched on request and is weighed,
Batch mixing 1 minute in mixer, adds the modified water glass of 6% weight ratio, continues stirring 3 minutes, will according to template size after discharging
Ask and be manually or mechanically molded, the dry 10h at 260 DEG C, it is stand-by to organize mould on request after dry.Its performance indicator see the table below 6：
This comparative example due to modified water glass addition be 2%, change surname waterglass as bonding agent additive amount it is too low when,
It will cause the shortcomings such as the sand mold molding construction time is too short, intensity is low after shaping drying, and be unfavorable for the transport and assembling of sand mold, due to
Bond strength is low, causes thermal-shock resistance poor, is unfavorable for the casting of product.
Comparative example 3：
One kind production founding aluminium oxide refractory material spinelle sand mold and preparation method thereof --- modified water glass bonded spinel
Stone sand sand mold, in terms of weight percentage, raw material is：The electric melting magnesium aluminum spinel 50% of 5 ~ 3mm, the electric melting magnesium-aluminium point of 3 ~ 1 mm
Spar 25%, the electric melting magnesium aluminum spinel 25% of≤1mm, the MgO+Al of electric smelting spinelle2O3Content is 92.7%；Modified water glass
Outer dosage is 4%, and modified water glass is using polyacrylamide under room temperature according to weight ratio 1:8 ratio is added to water glass solution
In, stand 24 it is small when after use.Modified modulus of water glass is 2.8.Above-mentioned magnesium aluminate spinel is matched on request and is claimed
Amount, batch mixing 2 minutes in mixer, add the modified water glass of 4% weight ratio, continue stirring 2 minutes, according to template after discharging
Size requirement is manually or mechanically molded, and the dry 16h at 180 DEG C, it is stand-by to organize mould on request after dry.Its performance indicator is shown in
Table 7 below：
This comparative example is since 5 ~ 3mm electric melting magnesium aluminum spinels coarse aggregate proportioning reaches 50%, fine aggregate（3~1 mm）And powder
（≤1 mm）Ratio is too low, causes after being molded due to particle segregation, its combination is mainly that the point contact between aggregate combines,
Surface-to-surface combination ratio is low, causes template bulk density low, and the porosity is high, and intensity is low, is unfavorable for the transport and assembling of sand mold, no
Beneficial to the casting of product.
Claims (4)
1. a kind of founding aluminium oxide refractory material spinelle sand mold, raw material is electric smelting or sinters spinelle sand, additional modified water
Glass, is expressed as according to mass percent：
The magnesium aluminate spinel 10 ~ 30% of 5 ~ 3 mm of granularity；
The magnesium aluminate spinel 30 ~ 65% of 3 ~ 1 mm of granularity；
The magnesium aluminate spinel 30 ~ 60% of the mm of granularity≤1；
Modified water glass 3 ~ 8%.
2. the spinelle sand mold according to claims 1, the electric smelting or sintering spinelle sand composition are：MgO+Al2O3≥
90%。
3. spinelle sand mold according to claim 1, modified water glass modulus is 2.4 ~ 3.0, and modifying agent is polyacrylamide
Or sodium tripolyphosphate, according to weight ratio 1 under room temperature：7 ~ 10 ratio is added in water glass solution, stand 24 it is small when after can use.
4. a kind of preparation method of any one of claim 1-3 founding aluminium oxide refractory material spinelle sand molds, will be upper
The raw material for stating granularity and component requirements is weighed by proportioning, and batch mixing 1 ~ 3 minute in mixer, adds a certain proportion of modification
Waterglass, continues stirring 3 ~ 5 minutes, and discharge aftershaping, and it is stand-by after dry 8 ~ 24h to organize mould on request at 180 ~ 260 DEG C.
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| CN201711247550.3A CN107935570A (en) | 2017-12-01 | 2017-12-01 | A kind of founding aluminium oxide refractory material spinelle sand mold and preparation method thereof |
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| CN112794711A (en) * | 2021-01-14 | 2021-05-14 | 东北大学 | Spinel-magnesium-based ceramic core and preparation method thereof |
| CN114436558A (en) * | 2022-01-17 | 2022-05-06 | 都江堰瑞泰科技有限公司 | Water glass modifier, modified water glass sand mold, preparation process and application thereof |
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| CN112794711A (en) * | 2021-01-14 | 2021-05-14 | 东北大学 | Spinel-magnesium-based ceramic core and preparation method thereof |
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Application publication date: 20180420 |