CN106186708A - The preparation method of crystallite vitreous silica low-pressure casting lift tube - Google Patents

The preparation method of crystallite vitreous silica low-pressure casting lift tube Download PDF

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Publication number
CN106186708A
CN106186708A CN201610544203.6A CN201610544203A CN106186708A CN 106186708 A CN106186708 A CN 106186708A CN 201610544203 A CN201610544203 A CN 201610544203A CN 106186708 A CN106186708 A CN 106186708A
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CN
China
Prior art keywords
vitreous silica
pressure casting
crystallite
lift tube
low
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CN201610544203.6A
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Chinese (zh)
Inventor
刘鹏松
杜庆洋
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Henan Dimensional Hankin Technology Co Ltd
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Henan Dimensional Hankin Technology Co Ltd
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Priority to CN201610544203.6A priority Critical patent/CN106186708A/en
Publication of CN106186708A publication Critical patent/CN106186708A/en
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0009Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent

Abstract

The invention belongs to high temperature resistant structure ceramics technical field, be specifically related to the preparation method of a kind of crystallite vitreous silica low-pressure casting lift tube.Vitreous silica powder body and BN use wet ball grinding batch mixing, obtain slurry;The slurry of mix homogeneously is dried, add binding agent and carry out pelletize, be loaded in mould, isostatic pressing, pressurize, obtain base substrate;Base substrate is dried in tunnel cave, burns till, to obtain final product.The present invention disclosure satisfy that low-pressure casting lift tube use requirement in actual applications, the raising of density and controlled micro crystallization effect improve the intensity of goods, the service life of stalk can be improved, the production efficiency of low pressure casting can be improved, fused quartz ceramic stalk goods low cost, reduces the production cost of low pressure casting product.

Description

The preparation method of crystallite vitreous silica low-pressure casting lift tube
Technical field
The invention belongs to high temperature resistant structure ceramics technical field, be specifically related to a kind of crystallite vitreous silica low pressure casting liter The preparation method of liquid pipe.
Background technology
The material of traditional stalk is generally cast iron or Si3N4/ SiC composite ceramics.Cast iron stalk is due to ferrum under high temperature React with molten aluminum liquid, easily pollute aluminum liquid, affect the quality of cast aluminium product, and cast iron stalk is short for service life, change Waste time and energy, affect production efficiency;And Si3N4Although/SiC composite ceramics has length in service life, resistant to corrosion, does not pollute aluminum liquid Etc. advantage, but the shortcomings such as its cost of material height, complicated process of preparation also limit its use.
Fused quartz ceramic has the thermal shock resistance of excellence, thermal coefficient of expansion is little, thermal conductivity is low, resistance to glass and molten metal The advantages such as body erosion.Its outstanding feature one is that thermal coefficient of expansion is little, and pure quartz-ceramics thermal coefficient of expansion (room temperature-800 DEG C) is only It is 0.54 × 10-6/ DEG C, heat conductivity is low, thus Heat stability is good;Two be quartz-ceramics bending strength with temperature rising and Increase, from the bending strength increase about 33% of room temperature to 1100 DEG C quartz-ceramics.If using vitreous silica is that raw material is prepared low Stalk is made in die casting, will have the thermal shock resistance of excellence, is conducive to improving the service life of stalk, is widely used in glass The industries such as glass, metallurgy, non-ferrous metal.But vitreous silica is amorphous carbon/silicon dioxide, it is thermodynamically meta shape State, easily occurs solid-state phase changes to be changed into the α-cristobalite of crystalline state in high-temperature sintering process, owing to cristobalite melts with amorphous state Melt the performances such as quartzy thermal coefficient of expansion there are differences, therefore have impact on the thermal shock resistance that fused quartz ceramic is overall, even In sintering process, produce stress fracture, therefore should avoid or control the phase of quartz in the sintering process of fused quartz ceramic Become, thus cause the sintering temperature of fused quartz ceramic not above 1200 DEG C, vitreous silica under such sintering temperature Pottery can not well sinter, and general density is at 1.9g/cm3Left and right, below bending strength 60MPa, have impact on vitreous silica pottery The service life of ceramic products.
Summary of the invention
It is an object of the invention to provide the preparation method of a kind of crystallite vitreous silica low-pressure casting lift tube, scientific and reasonable, Simple, the fused quartz ceramic stalk of preparation have excellence thermal shock resistance, thermal coefficient of expansion is little, density is high, strong Degree is high, service life is long.
The preparation method of crystallite vitreous silica low-pressure casting lift tube of the present invention, step is as follows:
(1) vitreous silica powder body and BN use wet ball grinding batch mixing, obtain slurry;
(2) slurry of mix homogeneously is dried, add binding agent and carry out pelletize, be loaded in mould, isostatic pressing, Pressurize, obtains base substrate;
(3) base substrate is dried in tunnel cave, burns till, to obtain final product.
The 0.5-1% that addition is vitreous silica powder quality of the BN described in step (1).
In wet ball grinding described in step (1), ratio of grinding media to material is 2:1, with ethanol as solvent, ZrO2Ceramic Balls is grinding medium Matter.
Binding agent described in step (2) is poly-vinyl alcohol solution.
The concentration of described poly-vinyl alcohol solution is 2wt%.
Isostatic pressing pressure described in step (2) is 100-120MPa.
Dwell time described in step (2) is 2min.
Firing temperature described in step (3) is 1280-1320 DEG C, and firing time is 0.5-1.5h.
Vitreous silica has minimum mean coefficient of linear thermal expansion, and (20 DEG C~1000 DEG C is 5.4 × 10-7/ DEG C), density (2.203g/cm3), dielectric loss angle tangent value (less than 0.0004), heat conductivity (0~1200 DEG C of about 2.09W/ (m K)), Fabulous seismic stability (being resistant to 1500 DEG C of temperature difference) and chemistry-resistant characteristic (acid, halogen, molten metal), non-oxidizability, The feature that wear resistence etc. are excellent, utilizes vitreous silica raw material to prepare fused quartz ceramic stalk, low cost, and technique is relatively simple, Not only can meet that stalk is high temperature resistant, anti-thermal shock, the corrosion of resistance to aluminum and good air-tightness, and long-term heat resistanceheat resistant can be reached The rigors such as impact fatigue property.
The present invention, by the effect of sintering aid BN, uses higher fused quartz ceramic sintering temperature, prepares crystallite and melts Melting quartz low-pressure casting lift tube, when in the vitreous silica stalk of preparation, α-cristobalite content is less than 3%, material still has The excellent thermal shock resistance of fused quartz ceramic, thermal coefficient of expansion is little, thermal conductivity is low, resistance to glass and metal liquid erosion etc. are excellent Point.Therefore, the fused quartz ceramic stalk that prepared by the present invention has the thermal shock resistance of excellence, thermal coefficient of expansion is little, density Height, intensity are high, service life is long, can be widely applied to the industries such as glass, metallurgy, non-ferrous metal.
The present invention compared with prior art, has the advantages that
The present invention makes the density of fused quartz ceramic stalk goods reach by addition and the sintering temperature of regulation and control BN 2.0g/cm3Above, α-cristobalite crystal content is less than 3%, and rupture strength reaches more than 60MPa, thermal coefficient of expansion less than 0.8 × 10-6/ DEG C (20 DEG C~1000 DEG C), do not affect its thermal shock resistance, it is possible to meets low-pressure casting lift tube in actual applications Use requirement;The raising of density and controlled micro crystallization effect improve the intensity of goods, it is possible to increase the service life of stalk, can carry The production efficiency of high-low pressure casting;Fused quartz ceramic stalk goods low cost, the production reducing low pressure casting product becomes This.
Accompanying drawing explanation
Fig. 1 is the XRD figure spectrum of embodiment 1 stalk goods, wherein, for α-cristobalite.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
Weighing 15Kg vitreous silica powder body raw material, add 75gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 100MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1280 DEG C, it is incubated 0.5h burns till.The density of goods is 2.03g/cm3, α-cristobalite crystal content is 2.3%, anti-folding Intensity is 62.5MPa, and thermal coefficient of expansion is 0.73 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 2
Weighing 15Kg vitreous silica powder body raw material, add 150gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 100MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1280 DEG C, it is incubated 0.5h burns till.The density of goods is 2.11g/cm3, α-cristobalite crystal content is 2.6%, anti-folding Intensity is 67.5MPa, and thermal coefficient of expansion is 0.75 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 3
Weighing 15Kg vitreous silica powder body raw material, add 75gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 120MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1280 DEG C, it is incubated 0.5h burns till.The density of goods is 2.06g/cm3, α-cristobalite crystal content is 2.3%, anti-folding Intensity is 65.8MPa, and thermal coefficient of expansion is 0.73 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 4
Weighing 15Kg vitreous silica powder body raw material, add 75gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 100MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1320 DEG C, it is incubated 0.5h burns till.The density of goods is 2.13g/cm3, α-cristobalite crystal content is 2.7%, anti-folding Intensity is 68.3MPa, and thermal coefficient of expansion is 0.77 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 5
Weighing 15Kg vitreous silica powder body raw material, add 75gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 100MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1280 DEG C, it is incubated 1.5h burns till.The density of goods is 2.03g/cm3, α-cristobalite crystal content is 2.5%, anti-folding Intensity is 63.1MPa, and thermal coefficient of expansion is 0.74 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 6
Weighing 15Kg vitreous silica powder body raw material, add 150gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol is Solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 120MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1320 DEG C, it is incubated 1.5h burns till.The density of goods is 2.15g/cm3, α-cristobalite crystal content is 2.8%, anti-folding Intensity is 69.8MPa, and thermal coefficient of expansion is 0.78 × 10-6/ DEG C (20 DEG C~1000 DEG C).
Embodiment 7
Weighing 15Kg vitreous silica powder body raw material, add 112.5gBN, (ratio of grinding media to material is 2:1 to wet ball grinding batch mixing, with ethanol For solvent, ZrO2Ceramic Balls is abrasive media), by dried for mix homogeneously ground slurry, add poly-vinyl alcohol solution (2wt%) and make Grain, is loaded in mould, and under 110MPa pressure, isostatic pressing, pressurize 2min, obtain base substrate, and base substrate is dry in tunnel cave Dry, at 1300 DEG C, it is incubated 1h burns till.The density of goods is 2.11g/cm3, α-ashlar crystal content is 2.5%, rupture strength For 65.2MPa, thermal coefficient of expansion is 0.75 × 10-6/ DEG C (20 DEG C~1000 DEG C).

Claims (8)

1. the preparation method of a crystallite vitreous silica low-pressure casting lift tube, it is characterised in that step is as follows:
(1) vitreous silica powder body and BN use wet ball grinding batch mixing, obtain slurry;
(2) slurry of mix homogeneously is dried, add binding agent and carry out pelletize, be loaded in mould, isostatic pressing, protect Pressure, obtains base substrate;
(3) base substrate is dried in tunnel cave, burns till, to obtain final product.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (1) addition of the BN described in is the 0.5-1% of vitreous silica powder quality.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (1) in the wet ball grinding described in, ratio of grinding media to material is 2:1, with ethanol as solvent, ZrO2Ceramic Balls is abrasive media.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (2) binding agent described in is poly-vinyl alcohol solution.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 4, it is characterised in that described The concentration of poly-vinyl alcohol solution be 2wt%.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (2) the isostatic pressing pressure described in is 100-120MPa.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (2) dwell time described in is 2min.
The preparation method of crystallite vitreous silica low-pressure casting lift tube the most according to claim 1, it is characterised in that step (3) firing temperature described in is 1280-1320 DEG C, and firing time is 0.5-1.5h.
CN201610544203.6A 2016-07-12 2016-07-12 The preparation method of crystallite vitreous silica low-pressure casting lift tube Pending CN106186708A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109180169A (en) * 2018-07-27 2019-01-11 华南理工大学 A kind of high-heat resistance shock resistant ceramic film support and preparation method thereof

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CN85107048A (en) * 1985-05-28 1986-11-26 希钦拿制造公司 Metal casting
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EP1985594A1 (en) * 2007-04-25 2008-10-29 ESK Ceramics GmbH & Co.KG Moulded body with a long life hard coating made of silicium nitride, method for its manufacture and its application
CN101357843A (en) * 2008-08-08 2009-02-04 东营新科信特陶有限责任公司 Alumina titanate ceramica lift tube preparation method
CN101767983A (en) * 2009-12-25 2010-07-07 河北理工大学 Fused silica ceramic material containing ytterbium oxide and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN85107048A (en) * 1985-05-28 1986-11-26 希钦拿制造公司 Metal casting
US5014561A (en) * 1989-05-31 1991-05-14 Midwest Instrument Co., Inc. Method and apparatus for obtaining accurate sample
EP1985594A1 (en) * 2007-04-25 2008-10-29 ESK Ceramics GmbH & Co.KG Moulded body with a long life hard coating made of silicium nitride, method for its manufacture and its application
CN101357843A (en) * 2008-08-08 2009-02-04 东营新科信特陶有限责任公司 Alumina titanate ceramica lift tube preparation method
CN101767983A (en) * 2009-12-25 2010-07-07 河北理工大学 Fused silica ceramic material containing ytterbium oxide and preparation method thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109180169A (en) * 2018-07-27 2019-01-11 华南理工大学 A kind of high-heat resistance shock resistant ceramic film support and preparation method thereof

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