CN104591758A - Preparation method of aluminium titanate ceramic sprue bush for casting - Google Patents
Preparation method of aluminium titanate ceramic sprue bush for casting Download PDFInfo
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- CN104591758A CN104591758A CN201510064994.8A CN201510064994A CN104591758A CN 104591758 A CN104591758 A CN 104591758A CN 201510064994 A CN201510064994 A CN 201510064994A CN 104591758 A CN104591758 A CN 104591758A
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Abstract
The invention belongs to the field of ceramic materials preparation, and particularly relates to a preparation method of an aluminium titanate ceramic sprue bush for casting. The method disclosed by the invention comprises the following steps: grinding an aluminium titanate raw material until an appropriate fineness is achieved, forming by using a gelcasting process, and carrying out strong oxidized flaming, thus obtaining the aluminium titanate sprue bush, wherein the porosity of the sprue bush is 25-45%, and the flexural strength of the sprue bush is greater than or equal to 35 MPa. Compared with conventional aluminium titanate ceramic sprue bushes, the aluminium titanate ceramic sprue bush prepared according to the invention is higher in strength and air impermeability, and has excellent properties such as excellent thermal vibration resistance, excellent oxidation resistance and corrosion resistance, adhered scaling resistance, less defect, and the like, the service life is 30-60 days, the reject rate of low pressure casting is reduced, and the cost performance of products is improved; and the preparation process is optimized, a burl accumulation phenomenon caused by melt-cinder adhering is reduced, and the cost of low pressure casting is greatly lowered.
Description
Technical field
The invention belongs to field of ceramic material preparation, be specifically related to a kind of preparation method cast with alumina titanate ceramics sprue bush.
Background technology
Sprue bush is widely used in the key part in non-ferrous metal metallurgy casting field low-pressure die casting plant, realizes non-ferrous metal solution to be given rise in mold cavity from melting equipment by low pressure to cast, and is the vitals that low-pressure casting affects consecutive production.Therefore, Low Pressure Casting Technology requires that sprue bush should have the excellent premium properties such as heat-shock resistance, excellent anti-oxidant and erosion resistance, higher intensity, high leakproofness, anti stickness fouling, insulation.
Current domestic low-pressure casting sprue bush material is mainly divided into: metal sprue bush, quartz-ceramics sprue bush, alumina titanate ceramics sprue bush, carbide composite ceramic sprue bush etc.Metal sprue bush resistance to air loss is better, anti-oxidant and the corrosion of resistance to aluminium is poor, produces impurity and to stick together fouling more, and have a strong impact on casting quality, work-ing life is shorter, restricts consecutive production, production cost and maintenance cost higher; The alternative metals sprue bush such as quartz-ceramics sprue bush, alumina titanate ceramics sprue bush, carbide composite ceramic sprue bush, there is reasonable anti-oxidant and erosion resistance, but intensity is lower, apparent porosity is higher directly affects heat-shock resistance and resistance to air loss, exceed metal sprue bush work-ing life, be generally 15-20 days.
Summary of the invention
The object of this invention is to provide a kind of preparation method cast with alumina titanate ceramics sprue bush, scientific and reasonable, simple, reduce cost, the sprue bush of preparation has the premium properties of shaking property of heat resistanceheat resistant, oxidation-resistance, erosion resistance, high strength, high leakproofness, anti stickness fouling, good heat insulation, long service life.
The preparation method of casting alumina titanate ceramics sprue bush of the present invention, step is as follows:
(1) aluminium titanates, acrylamide, N, N'-methylene-bisacrylamide, ammonium polymethacrylate, grinding medium and deionized water carried out levigate in ball milling or other abrasive material machine and be mixed with the slurry of homogeneous;
(2) slurry of step (1) is put into vacuum mixer and vacuumize stirring, obtain slip;
(3) slip in step (2) is put into container to stir, add catalyzer, stir after within 1-5 minute, making slip evenly, then add initiator, then after stirring and within 1-5 minute, making slip evenly; Slip is injected mould gel, leave standstill depanning drying in 10-45 minute after gel, obtain base substrate;
(4) base substrate step (3) obtained loads kiln kiln roasting, and firing period is 24-48 hour, at 1500-1560 DEG C, be incubated 4-8 hour, kiln discharge after cooling, processes or does not process and get final product.
Aluminium titanates described in step (1) is made up of the raw material of following weight percent:
Be crushed to D50=3-5 μm, then at 1350-1420 DEG C of synthesis aluminium titanates.
In step (1) in the quality of aluminium titanates for 100%,
Described aluminium titanates mean particle size is 25-40 μm, purity >=98%.
In described raw material, aluminium titanates (β phase aluminium titanates >=90%, stablizer≤10% such as magnesium titanate, other total impurities≤1.5%) is main component.
Grinding medium described in step (1) is aluminum oxide mill Jie ball, and the mass ratio of grinding medium and aluminium titanates is 2-2.5:1; Aluminum oxide mill Jie ball is 92 alumina balls.
Ball-milling Time described in step (1) is 24-40 hour, and slurry fineness controls at 1-7 μm.
Vacuum tightness described in step (2) is-0.9MPa, and churning time more than 2 hours is until the whole emptying of bubble.
Catalyzer described in step (3) is N, N, N', N'-Tetramethyl Ethylene Diamine; Add-on changes with variation of ambient temperature, also can determine a certain amount of adding in thermostatic chamber.Catalyzer can directly use, and also can be mixed into solution with certain proportion deionized water and use.
Initiator described in step (3) is ammonium persulphate, the ammonium persulfate aqueous solution of preferred mass mark 5-10%; Add-on changes with variation of ambient temperature, also can determine a certain amount of adding in thermostatic chamber.Initiator is configured to a certain proportion of aqueous solution and uses.
Gel time described in step (3) is 5-15 minute, and drying temperature is 40-160 DEG C, and time of drying is 12-48 hour.
Cooling time described in step (4) is 48-72 hour.
The preparation method of casting alumina titanate ceramics sprue bush of the present invention, concrete steps are as follows:
(1) aluminium titanates, acrylamide, N, N'-methylene-bisacrylamide, ammonium polymethacrylate, grinding medium and deionized water carried out levigate in ball milling or other abrasive material machine and be mixed with the slurry of homogeneous;
(2) put into vacuum mixer in the slurry of step (1) to vacuumize, vacuum tightness-0.9MPa, stir more than 2 hours;
(3) slip in step (2) is pressed mould size calculating slip amount, put into suitable vessel to stir, adding catalyzer respectively is in right amount N, N, N', N'-Tetramethyl Ethylene Diamine (T E M E D) (drip adds), stirs after within 1-5 minute, making slip evenly, add the aqueous solution (drip adds) of initiator ammonium persulfate (APS) 5-10% again, then after stirring and within 1-5 minute, making slip evenly; Slip is injected the mould combined in advance slowly add, by controlling catalyzer, the consumption of initiator controls gel time, and slip is gel 5-15 minute in the mould of metal or other materials, leaves standstill depanning drying in 10-45 minute after gel;
(4) dry base substrate step (3) obtained loads in kiln, and firing period is 24-48 hour, at 1500-1560 DEG C, be incubated 4-8 hour, kiln discharge after cooling, processes or does not process and get final product.
The sprue bush that the present invention produces is owing to adopting aqueous slurries formed in situ, and scientific and reasonable, solve the textural defect that other forming methods bring, consistence is good, and product performance improve, and work-ing life improves, and general work-ing life, 15-20 days, reduced cost.
The present invention adopts gel casting forming legal system for alumina titanate ceramics sprue bush, the feature of the method prepares homogeneous slip, under the effect of catalyzer, initiator, slip is solidified in position, prepare flawless ceramic body, through burning till preparation high-quality alumina titanate ceramics sprue bush, improving the use thermal shock resistance of alumina titanate ceramics sprue bush, thus improving the work-ing life of alumina titanate ceramics sprue bush.Slip does not need the link such as spraying dry, blank processing, and no waste mine, dust produce and improve operating environment and reduce manufacturing cost.
The present invention compared with prior art, has following beneficial effect:
Aluminum titanate raw materials is milled down to suitable fineness by the present invention, adopts gel injection molding and forming technology shaping, and is burnt till the aluminium titanates sprue bush of acquisition by Strong oxdiative flame, void content 25-45%, folding strength >=35MPa.Than conventional alumina titanate ceramics sprue bush, there is higher intensity and resistance to air loss, and there is the premium propertiess such as excellent shaking property of heat resistanceheat resistant, excellent anti-oxidant and erosion resistance, anti stickness fouling, defect be few, there is the work-ing life of 30-60 days, decrease the scrap rate of low-pressure casting, improve product cost; Meanwhile, optimize preparation technology, reduce melt cinder and stick together buildup phenomenon, considerably reduce low-pressure casting cost.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
(1) by aluminium titanates 300 kilograms, acrylamide 6 kilograms, N, 720 kilograms, N '-methylene-bisacrylamide 0.6 kilogram, deionized water 54 kilograms, ammonium polymethacrylate 1.5 kilograms, aluminum oxide mill Jie ball is in grinding machine, ball milling obtains the slurry mixing homogeneous for 40 hours, and the mean particle size of slurry Raw particle is 3.1 μm;
(2) slurry of step (1) is injected vacuum mixer, stir and vacuumize and make vacuum tightness reach-0.09MPa, keep 2 hours;
(3) vacuum treated slip 2 lifting in step (2) is entered in 3 liters of containers, stir and add N after 2 minutes, N, N', N'-Tetramethyl Ethylene Diamine 120, then stir 2 minutes, then add ammonium persulphate 160, also stir 2 minutes;
(4) by the slip of process in step (3), previously prepd mould is injected, 5 minutes gels;
(5) depanning in 10 minutes after the slurry gel in step (4), take out base substrate, base substrate, at 40-160 DEG C, heats up gradually, dry 48 hours;
(6) (2)-(5) are repeated until slip uses until exhausted;
(7) insulation 4 hours is burnt till in base substrate loading of kiln obtained in step (5) at 1500 DEG C, kiln discharge after cooling, process or do not process and get final product.
Product index: volume density 3.24g/cm
3, void content 32%, (3 points) bending strength 35MPa, linear expansivity (10
-6/ K): 1.28, resistance to air loss: 0.4MPa air pressure 1 minute is air tight.
Embodiment 2
(1) by aluminium titanates 300 kilograms, acrylamide 6 kilograms, N, 600 kilograms, N '-methylene-bisacrylamide 0.3 kilogram, deionized water 60 kilograms, methyl ammonium polyacrylate 1 kilogram, aluminum oxide mill Jie ball is in grinding machine, ball milling obtains the slurry mixing homogeneous for 40 hours, and the mean particle size of slurry Raw particle is 3.3 μm;
(2) slurry of step (1) is injected vacuum mixer, stir and vacuumize and make vacuum tightness reach-0.09MPa, keep 2 hours;
(3) vacuum treated slip 2 lifting in step (2) is entered in 3 liters of containers, stir and add N after 3 minutes, N, N', N'-Tetramethyl Ethylene Diamine 140, then stir 3 minutes, then add ammonium persulphate 180, also stir 3 minutes;
(4) by the slip of the process in step (3), previously prepd mould is injected, 8 minutes gels;
(5) depanning in 20 minutes after the slurry gel in step (4), take out base substrate, base substrate, at 40-160 DEG C, heats up gradually, dry 48 hours;
(6) (2)-(5) are repeated until slip uses until exhausted;
(7) by system in step (5) base substrate loading of kiln at 1520 DEG C, burn till insulation 4-8 hour, kiln discharge after cooling, processing or do not process and get final product.
Product index: volume density 3.28g/cm
3, void content 33%, (3 points) bending strength 34MPa, linear expansivity (10
-6/ K): 1.29, resistance to air loss: 0.4MPa air pressure 1 minute is air tight.
Embodiment 3
(1) by aluminium titanates 300 kilograms, acrylamide 6.5 kilograms, N, 750 kilograms, N '-methylene-bisacrylamide 0.4 kilogram, deionized water 65 kilograms, ammonium polymethacrylate 1.5 kilograms, aluminum oxide mill Jie ball is in grinding machine, ball milling obtains the slurry mixing homogeneous for 36 hours, slurry volume solid content is 54%, and the mean particle size of slurry Raw particle is 3.5 μm;
(2) slurry of step (1) is injected vacuum mixer, stir and vacuumize and make vacuum tightness reach-0.09MPa, keep 2 hours;
(3) vacuum treated slip 2 lifting in step (2) is entered in 3 liters of billys, stir and add N after 4 minutes, N, N', N'-Tetramethyl Ethylene Diamine 140, then stir 4 minutes, then add ammonium persulphate 180, also stir 4 minutes;
(4) by the slip of the process in step (3), previously prepd mould is injected, 10 minutes gels;
(5) depanning in 30 minutes after the slurry gel in step (4), take out base substrate, base substrate, at 40-120 DEG C, heats up gradually, dry 48 hours;
(6) (2)-(5) are repeated until slip uses until exhausted;
(7) by system in step (5) base substrate loading of kiln at 1540 DEG C, burn till insulation 6 hours, kiln discharge after cooling, processing or do not process and get final product.
Product index: volume density 3.30g/cm
3, void content 34%, (3 points) bending strength 36MPa, linear expansivity (10
-6/ K): 1.27, resistance to air loss: 0.4MPa air pressure 1 minute is air tight.
Embodiment 4
(1) by aluminium titanates 300 kilograms, acrylamide 7.5 kilograms, N, 750 kilograms, N '-methylene-bisacrylamide 0.4 kilogram, deionized water 70 kilograms, ammonium polymethacrylate 1.5 kilograms, aluminum oxide mill Jie ball is in grinding machine, ball milling obtains the slurry mixing homogeneous for 30 hours, slurry volume solid content is 54%, and the mean particle size of slurry Raw particle is 3.8 μm;
(2) slurry of step (1) is injected vacuum mixer, stir and vacuumize and make vacuum tightness reach-0.09MPa, keep 2 hours;
(3) vacuum treated slip 2 lifting in step (2) is entered in 3 liters of containers, stir and add N after 5 minutes, N, N', N'-Tetramethyl Ethylene Diamine 140, then stir 5 minutes, then add ammonium persulphate 180, also stir 5 minutes;
(4) by the slip of the process in step (3), previously prepd mould is injected;
(5) depanning in 40 minutes after the slurry gel in step (4), take out base substrate, base substrate, at 40-160 DEG C, heats up gradually, dry 48 hours;
(6) (2)-(5) are repeated until slip uses until exhausted;
(7) by system in step (5) base substrate loading of kiln at 1560 DEG C, burn till insulation 8 hours, kiln discharge after cooling, processing or do not process and get final product.
Product index: volume density 3.34g/cm
3, void content 37%, (3 points) bending strength 32MPa, linear expansivity (10
-6/ K): 1.25, resistance to air loss: 0.4MPa air pressure 1 minute is air tight.
Embodiment 5
(1) by aluminium titanates 300 kilograms, acrylamide 7.5 kilograms, N, 750 kilograms, N '-methylene-bisacrylamide 0.4 kilogram, deionized water 75 kilograms, ammonium polymethacrylate 1 kilogram, aluminum oxide mill Jie ball is in grinding machine, ball milling obtains the slurry mixing homogeneous for 28 hours, slurry volume solid content is 54%, and the mean particle size of slurry Raw particle is 4.0 μm;
(2) slurry of step (1) is injected vacuum mixer, stir and vacuumize and make vacuum tightness reach-0.09MPa, keep 2 hours;
(3) vacuum treated slip 2 lifting in step (2) is entered in 3 liters of containers, stir and add N after 2 minutes, N, N', N'-Tetramethyl Ethylene Diamine 140, then stir 2 minutes, then add ammonium persulphate 180, also stir 2 minutes;
(4) by the slip of the process in step (3), previously prepd mould is injected;
(5) depanning in 20 minutes after the slurry gel in step (4), take out base substrate, base substrate, at 40-160 DEG C, heats up gradually, dry 48 hours;
(6) (2)-(5) are repeated until slip uses until exhausted;
(7) by system in step (5) base substrate loading of kiln at 1550 DEG C, burn till insulation 6 hours, kiln discharge after cooling, processing or do not process and get final product.
Product index: volume density 3.30g/cm
3, void content 34%, (3 points) bending strength 34MPa, linear expansivity (10
-6/ K): 1.22, resistance to air loss: 0.4MPa air pressure 1 minute is air tight.
Claims (10)
1. cast the preparation method with alumina titanate ceramics sprue bush, it is characterized in that step is as follows:
(1) aluminium titanates, acrylamide, N, N'-methylene-bisacrylamide, ammonium polymethacrylate, grinding medium and deionized water carried out levigate in ball milling or other abrasive material machine and be mixed with the slurry of homogeneous;
(2) slurry of step (1) is put into vacuum mixer and vacuumize stirring, obtain slip;
(3) slip in step (2) is put into container to stir, add catalyzer, stir after within 1-5 minute, making slip evenly, then add initiator, then after stirring and within 1-5 minute, making slip evenly; Slip is injected mould gel, leave standstill depanning drying in 10-45 minute after gel, obtain base substrate;
(4) base substrate step (3) obtained loads kiln kiln roasting, and firing period is 24-48 hour, at 1500-1560 DEG C, be incubated 4-8 hour, kiln discharge after cooling, processes or does not process and get final product.
2. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, is characterized in that the aluminium titanates described in step (1) is made up of the raw material of following weight percent:
Be crushed to D50=3-5 μm, then at 1350-1420 DEG C of synthesis aluminium titanates.
3. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, to is characterized in that in step (1) in the quality of aluminium titanates for 100%,
4. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, it is characterized in that the grinding medium described in step (1) is aluminum oxide mill Jie ball, the mass ratio of grinding medium and aluminium titanates is 2-2.5:1.
5. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, it is characterized in that the Ball-milling Time described in step (1) is 24-40 hour, slurry fineness controls at 1-7 μm.
6. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, is characterized in that the vacuum tightness described in step (2) is for-0.9MPa, churning time more than 2 hours.
7. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, is characterized in that the catalyzer described in step (3) is N, N, N', N'-Tetramethyl Ethylene Diamine.
8. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, is characterized in that the initiator described in step (3) is ammonium persulphate.
9. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, it is characterized in that the gel time described in step (3) is 5-15 minute, drying temperature is 40-160 DEG C, and time of drying is 12-48 hour.
10. the preparation method of casting alumina titanate ceramics sprue bush according to claim 1, is characterized in that the cooling time described in step (4) is 48-72 hour.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107721424A (en) * | 2017-09-30 | 2018-02-23 | 江苏师范大学 | A kind of method that gel casting forming prepares YAG crystalline ceramics |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103419268A (en) * | 2013-06-28 | 2013-12-04 | 无锡特科精细陶瓷有限公司 | Water-based gel casting method for structural ceramics |
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- 2015-02-06 CN CN201510064994.8A patent/CN104591758A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103419268A (en) * | 2013-06-28 | 2013-12-04 | 无锡特科精细陶瓷有限公司 | Water-based gel casting method for structural ceramics |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107721424A (en) * | 2017-09-30 | 2018-02-23 | 江苏师范大学 | A kind of method that gel casting forming prepares YAG crystalline ceramics |
| CN107721424B (en) * | 2017-09-30 | 2020-07-28 | 江苏师范大学 | Method for preparing YAG transparent ceramic by gel casting |
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