CN109732036A - Moltening mold castings fill core material and preparation method - Google Patents
Moltening mold castings fill core material and preparation method Download PDFInfo
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Abstract
Moltening mold castings fill core material and preparation method, are related to moltening mold castings and fill core material.Its ingredient are as follows: the 100-325 mesh fused quartz powder of mass percent purity >=99.5%, the 50-100 mesh fused quartz powder of mass percent purity >=99.5%, the 20-50 mesh fused quartz powder of mass percent purity >=99.5%, the calcium aluminate of mass percent purity >=99.5%, the ammonium chloride of mass percent purity >=99.5%, mass percent dioxide-containing silica are the silica solution, surfactant and defoaming agent of 29%-31% and pH in 9.7-10.5.Core material main component prepared by the present invention of filling is vitreous silica, and thermal expansion coefficient is small, dimensionally stable, can be well matched with most of shells.The addition of surfactant enhances the mobility of slurry, so as to make slurry have higher solid content.
Description
Technical field
The present invention relates to metal smelt technical fields, and in particular to moltening mold castings fill core material.
Background technique
Near net-shaped melted module precise casting technology is the mainstream technology for preparing high-accuracy precast component in the world.This method by using
High-quality mould material, mold material and the strict control to each process procedure and technological factor in casting forming process can get work
Make the near net-shaped casting that face carries out detail sanding without machining or only.The casting dimension accuracy of precision-investment casting and surface
Roughness is close to polished part, and up to control within ± the 0.5% of nominal dimension, surface roughness can reach dimensional tolerance
Ra3.2.It is CAD/CAM/CAE technology, materialogy, metallurgical physics and chemistry, precise forming control, characterization and non-destructive testing etc.
The complex art of multi-crossed disciplines.Therefore melted module precise casting technology has casting dimensional accuracy height, surface roughness low, available
In complex-shaped (especially inner cavity the is complicated) thin-wall part of casting and unitarily formed advantage.
As the structure of casting becomes increasingly complex, ceramic core in model casting using more and more extensive.Commonly
Ceramic core is prefabrication type core, however, the use of this types of core under certain conditions is restricted, such as aero-engine casing class
Heavy castings with hollow structure, though supporting plate inner cavity is uncomplicated, more long and narrow, being stained with slurry leaching sand etc. processes preceding several layers of is
Can go on smoothly, but with the accumulation of shell thickness, intracavity space is more and more narrower, shell processed operation be increasingly difficult into
Row, and easily there is situations such as slurry accumulation and bridging of sand material, cause the partial structurtes defect of shell.In this case, in supporting plate
Chamber is just needed using ceramic core.However, prefabrication type core is expensive, and it is larger for certain interior chamber sizes and wall thickness is relatively thin
Position, the larger weight of the unbearable firmly prefabrication type core of wax-pattern, easily causes wax-pattern deformation even broken.In view of the situation,
It can choose and whole fusible pattern is first coated with several layers shell, before the thickness of interior lumen type shell is not enough to that sand material is caused to put up a bridge, with filling
It starches molding method to fill ceramic slurry into shell cavity, slurry realizes solidification under the action of coagulant, dry certain
It can continue to carry out shell operation processed in the outside of dry base substrate after time, until reaching required shell thickness.It fills to shell
The ceramic material of inner cavity is to fill core material, fills core material and combines with shell wrapped outside, common to play ceramics
The effect of type core.
Core material is filled in slurry molding requirement should be the liquid slurry of good fluidity before filling type, and have retardation of curing
Property.It fills core material to be wrapped in shell, not contacted directly with molten metal in casting process, therefore, in material refractoriness, chemistry
The requirement of stability etc. is lower than prefabrication type core, however proposes requirements at the higher level to the wet base intensity for filling core material.Fill core material
Material is solidificated in more closed investment shell intracavity, it is extremely difficult to dry, it is difficult to the raising of wet strength is obtained by the volatilization of solvent, this is just needed
Core material is filled with enough self-hardening performances.If the wet strength for filling core material is insufficient, steamed in the steam dewaxing release stage
It is broken easily to cause to fill core material cracking under the action of vapour tensile stress.In addition, filling core material in dewaxing, roasting, alloy casting etc.
To guarantee enough dimensional stabilitys in the process.After casting pouring is cooling, filling core material needs easily to remove completely from cast-internal.
The relevant report for filling core material about moltening mold castings at present is seldom, Sichuan University Min small pretty equal (Min little Jun, Lee
Rather, experimental study [J] the Special Processes of Metal Castings of the phosphate bonded air-set mold core of He Yiming hot investment casting and non-ferrous alloy, 2005,25
(7): 428-430.) be coagulant using ammonium di-hydrogen phosphate as binder, magnesia, high-purity silicon dioxide is refractory aggregate, is used
The method of slurry molding prepares the excellent phosphate ceramics type core of high temperature performance, and as filling core material in more essences
Casting factory is applied.Phosphate is as a kind of new material that casting binder is that last century the seventies development abroad is got up.
Phosphate, by the comprehensive function of mechanical interlock power, molecular separating force and chemical bond force, can make it have as binder from firmly
Good room temperature performance and high-temperature behavior, refractoriness are shown in terms of defeated and dispersed type organic up to 1300~1600 DEG C
The characteristics of resin, is referred to as inorganic resin, this is as desired by casting binder.However, phosphate fills core material solid
Certain heat can be discharged during change, these will lead to wax-pattern expanded by heating in the heat of investment shell intracavity release, and then influence
The dimensional accuracy of wax-pattern and casting.
Summary of the invention
The object of the present invention is to provide a kind of moltening mold castings to fill core material, to solve the above problems.
The present invention also aims to be provided a kind of moltening mold castings and fill core material preparation method for material, can solve with preparation
The moltening mold castings for stating problem fill core material.
Technical problem solved by the invention can be realized using following technical scheme:
Moltening mold castings fill core material, ingredient are as follows: the 100-325 mesh vitreous silica of mass percent purity >=99.5%
Powder, the 50-100 mesh fused quartz powder of mass percent purity >=99.5%, mass percent purity >=99.5% 20-50 mesh
Fused quartz powder, the calcium aluminate of mass percent purity >=99.5%, the ammonium chloride of mass percent purity >=99.5%, quality
Percentage of silica content is the silica solution, surfactant and defoaming agent of 29%-31% and pH in 9.7-10.5.
The parts by weight of mentioned component are as follows: the 100-325 mesh fused quartz powder 400-530 of mass percent purity >=99.5%
Part;130-200 parts of the 50-100 mesh fused quartz powder of mass percent purity >=99.5%;Mass percent purity >=99.5%
130-200 parts of 20-50 mesh fused quartz powder;25-35 parts of calcium aluminate;45-55 parts of ammonium chloride;280-320 parts of silica solution;Surface
2 parts of activating agent;1 part of defoaming agent.
Moltening mold castings fill core material preparation method for material, comprising the following steps:
The first step, hardening agent prepare: by the fused quartz powder of the calcium aluminate and 100-325 mesh ratio of 1:3 in mass ratio into
Row mixing and ball milling, ratio of grinding media to material 2:1, Ball-milling Time are not less than 2 hours, and preferably 2 hours, powder 1 is made;
Second step, curing agent prepare: by the fused quartz powder of the ammonium chloride and 100-325 mesh ratio of 1:1 in mass ratio into
Row mixing and ball milling, ratio of grinding media to material 2:1, Ball-milling Time are not less than 2 hours, and preferably 2 hours, powder 2 is made;
Third step, powder mixing: the powder 1 for accounting for gross mass 2.8%-4.0% is weighed, accounts for gross mass 1.6%-2.0%'s
Powder 2 accounts for the fused quartz powder of the 100-325 mesh of gross mass 28%-43%, accounts for the 50-100 purpose of gross mass 13%-20%
Fused quartz powder accounts for the fused quartz powder of the 20-50 mesh of gross mass 13%-20%, by these powders be put into V-type batch mixer into
Row mixing, mixing time be not less than 10 hours, preferably 10 hours, be made powder 3;
4th step, slurry preparation: weighing the silica solution for accounting for gross mass 30%, and the surface for accounting for product gross mass 0.2% is living
Property agent and account for product gross mass 0.1% defoaming agent be added silica solution in, stir evenly, obtain mixture 1.Then by powder 3
It is added gradually in mixture 1, is stirred when powder 3 is added with strong mixer, make to form good whirlpool, add powder excessively program-controlled
System is within 30 seconds, after being added to powder, continues to stir slurry, soaks powder 3 and mixture 1 sufficiently, and equably
It is dispersed in mixture 1, continues high-speed stirred 1-2 minutes, then slow down mixing speed to 60 revs/min hereinafter, arranging bubble
Out, slurry is made, 3 to can be filled with investment shell intracavity for slurry after five minutes;
5th step fills type and solidification: above-mentioned slurry being filled with investment shell intracavity, 4 to 8 minutes is stood after filling type, is solidified into
Moltening mold castings fill core material.
The utility model has the advantages that core material main component prepared by the present invention of filling is vitreous silica, thermal expansion coefficient is small, and size is steady
It is fixed, it can be well matched with most of shells.The addition of surfactant enhances the mobility of slurry, so as to make slurry
Has higher solid content.
Calcium aluminate has the characteristics that quick-hardening and durability are strong, and at room temperature in 24 hours, calcium aluminate can be reacted with water
Form hydrated product CaOAlO10H2O, this product have very high intensity.In addition, calcium aluminate is viscous as a kind of gel
Agent is tied, the vitreous silica particle in wet base can be bonded.With the extension of curing time, calcium aluminate is to filling core green body wet strength
Humidification can show more obvious.In addition to cementation, calcium aluminate hydrate and the vitreous silica particle of crosslinking can be lockked
A part of moisture content, this will reduce the ratio of effective moisture content in the wet base of core material, and due to obtaining closer knot between adjacent particle
It closes, there is stronger Van der Waals force in green body.The Van der Waals force enhanced between this particle, it is right with the extension of curing time
Also there is great role in constructing stronger wet base intensity.With the raising for filling core material heats, calcium aluminate hydrate is from CaO
AlO·10H2O is gradually slowly converting to 2CaOAlO8H2O, 3CaOAlO6H2O and AlO3H2O.In conversion process
In, the strength reduction of calcium aluminate hydrate, but since conversion process is very slow, the intensity of calcium aluminate hydrate is in steam dewaxing
There was only slight decrease in the process.The addition of calcium aluminate is remarkably improved the intensity of type core green body, prevents or greatly reduce core material
Cracking improves density and impermeability.Meanwhile alkali metal content is very low in hardening agent, will not cause adverse effect to core material.
The present invention does not introduce adventitious solvent, ammonium chloride is complete at high temperature using ammonium chloride powder as curing agent simultaneously
It resolves into hydrogen chloride and ammonia and is discharged, do not influence the high temperature ingredient of core material.
The method of the present invention is easy, and what is be prepared fills core material in the preparation of the casting such as stainless steel, nickel base superalloy
It is applied in journey, casting obtained does not occur deformation, cracking, and dimensional accuracy is met the requirements.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below into
One step illustrates the present invention.
Embodiment 1
30g calcium aluminate and 90g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
50g ammonium chloride and 50g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
Weigh fused quartz powder 160g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 350g, 50-100 mesh
The mixing and ball milling powder and the above-mentioned ammonium chloride of 16g and 100-325 of the above-mentioned calcium aluminate of powder 146g, 28g and 100-325 mesh fused quartz powder
The mixing and ball milling powder of mesh fused quartz powder, these powders are put into V-type batch mixer and are mixed, and mixing time 10 hours, are mixed
It is good spare.
300g silica solution is weighed, 2g surfactant and 1g defoaming agent are added in silica solution, stirred evenly, it so will be above-mentioned
Uniformly mixed powder is added gradually in silica solution, is stirred when powder is added with strong mixer, is made to form good whirlpool
Whirlpool adds powder process control within 30 seconds, after being added to powder, continues to stir slurry, moistens powder sufficiently with silica solution
It is wet, and be evenly dispersed in silica solution, continue high-speed stirred 2 minutes, then slow down mixing speed to 60 revs/min hereinafter,
The bubble in slurry is discharged, slurry can be filled with to investment shell intracavity after five minutes, palpus strict control is filled with speed, and it is too fast, hold
It easily is involved in bubble, core material layering is easily led to slowly excessively, about 8 minutes is stood after filling type, core material, that is, curable.
Embodiment 2
30g calcium aluminate and 90g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
50g ammonium chloride and 50g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
Weigh fused quartz powder 175g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 300g, 50-100 mesh
The mixing and ball milling powder and the above-mentioned ammonium chloride of 18g and 100-325 of the above-mentioned calcium aluminate of powder 175g, 32g and 100-325 mesh fused quartz powder
The mixing and ball milling powder of mesh vitreous silica, these powders are put into V-type batch mixer and are mixed, mixing time 10 hours, mixed
It is spare.
300g silica solution is weighed, 2g surfactant and 1g defoaming agent are added in silica solution, stirred evenly, it then will be upper
It states uniformly mixed powder to be added gradually in silica solution, is stirred when powder is added with strong mixer, make to be formed good
Whirlpool adds powder process control within 30 seconds, after being added to powder, continues to stir slurry, keeps powder abundant with silica solution
Wetting, and is evenly dispersed in silica solution, continues high-speed stirred 1 minute, then slow down mixing speed to 60 revs/min with
Under, the bubble in slurry is discharged, slurry can be filled with to investment shell intracavity after 4 minutes, must strict control be filled with speed, it is too fast then
It is easy to be involved in bubble, easily leads to core material layering slowly excessively, about 6 minutes are stood after filling type, core material, that is, curable.
Embodiment 3
30g calcium aluminate and 90g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
50g ammonium chloride and 50g100-325 mesh fused quartz powder are poured into and carry out ball milling in ball mill, ratio of grinding media to material control exists
2:1, Ball-milling Time 2 hours, powder was spare.
Weigh fused quartz powder 140g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 370g, 50-100 mesh
The mixing and ball milling powder and the above-mentioned ammonium chloride of 20g and 100-325 of the above-mentioned calcium aluminate of powder 130g, 40g and 100-325 mesh fused quartz powder
The mixing and ball milling powder of mesh vitreous silica, these powders are put into V-type batch mixer and are mixed, mixing time 10 hours, mixed
It is spare.
300g silica solution is weighed, 2g surfactant and 1g defoaming agent are added in silica solution, stirred evenly, it then will be upper
It states uniformly mixed powder to be added gradually in silica solution, is stirred when powder is added with strong mixer, make to be formed good
Whirlpool adds powder process control within 30 seconds, after being added to powder, continues to stir slurry, keeps powder abundant with silica solution
Wetting, and is evenly dispersed in silica solution, continues high-speed stirred 1 minute, then slow down mixing speed to 60 revs/min with
Under, the bubble in slurry is discharged, slurry can be filled with to investment shell intracavity after 3 minutes, must strict control be filled with speed, it is too fast then
It is easy to be involved in bubble, easily leads to core material layering slowly excessively, about 4 minutes are stood after filling type, core material, that is, curable.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. moltening mold castings fill core material, it is characterised in that:
Its ingredient are as follows: the 100-325 mesh fused quartz powder of mass percent purity >=99.5%, mass percent purity >=
20-50 mesh fused quartz powder, the quality percentage of 99.5% 50-100 mesh fused quartz powder, mass percent purity >=99.5%
Than the calcium aluminate of purity >=99.5%, the ammonium chloride of mass percent purity >=99.5%, mass percent dioxide-containing silica
For 29%-31% and pH 9.7-10.5 silica solution, surfactant and defoaming agent.
2. moltening mold castings according to claim 1 fill core material, it is characterised in that: each ingredient in claim 1
Parts by weight are as follows:
400-530 parts of 100-325 mesh fused quartz powder;
130-200 parts of 50-100 mesh fused quartz powder;
130-200 parts of 20-50 mesh fused quartz powder;
25-35 parts of calcium aluminate;45-55 parts of ammonium chloride;280-320 parts of silica solution;2 parts of surfactant;1 part of defoaming agent.
3. moltening mold castings according to claim 2 fill core material, it is characterised in that: 30 parts of calcium aluminate;50 parts of ammonium chloride;
300 parts of silica solution.
4. moltening mold castings according to claim 3 fill core material, it is characterised in that:
490 parts of 100-325 mesh fused quartz powder;
160 parts of 50-100 mesh fused quartz powder;
146 parts of 20-50 mesh fused quartz powder.
5. moltening mold castings according to claim 3 fill core material, it is characterised in that:
440 parts of 100-325 mesh fused quartz powder;
175 parts of 50-100 mesh fused quartz powder;
175 parts of 20-50 mesh fused quartz powder.
6. moltening mold castings according to claim 3 fill core material, it is characterised in that:
510 parts of 100-325 mesh fused quartz powder;
140 parts of 50-100 mesh fused quartz powder;
130 parts of 20-50 mesh fused quartz powder.
7. moltening mold castings fill core material preparation method for material, which comprises the following steps:
The first step, hardening agent prepare: the fused quartz powder of the calcium aluminate and 100-325 mesh ratio of 1:3 in mass ratio is mixed
Ball milling, ratio of grinding media to material 2:1 are closed, Ball-milling Time is not less than 2 hours, and powder 1 is made;
Second step, curing agent prepare: the fused quartz powder of the ammonium chloride and 100-325 mesh ratio of 1:1 in mass ratio is mixed
Ball milling, ratio of grinding media to material 2:1 are closed, Ball-milling Time is not less than 2 hours, and powder 2 is made;
Third step, powder mixing: the powder 1 for accounting for gross mass 2.8%-4.0% is weighed, the powder of gross mass 1.6%-2.0% is accounted for
2, the fused quartz powder of the 100-325 mesh of gross mass 28%-43% is accounted for, the melting of the 50-100 mesh of gross mass 13%-20% is accounted for
Silica flour accounts for the fused quartz powder of the 20-50 mesh of gross mass 13%-20%, these powders is put into V-type batch mixer and are mixed
It closes, mixing time is not less than 10 hours, and powder 3 is made;
4th step, slurry preparation: weighing the silica solution for accounting for gross mass 30%, will account for the surfactant of product gross mass 0.2%
It is added in silica solution with the defoaming agent for accounting for product gross mass 0.1%, stirs evenly, obtain mixture 1, then gradually by powder 3
It is added in mixture 1, is stirred when powder 3 is added with strong mixer, make to form good whirlpool, powder process control is added to exist
Within 30 seconds, after being added to powder, continues to stir slurry, soak powder 3 and mixture 1 sufficiently, and be uniformly dispersed
In mixture 1, continue high-speed stirred 1-2 minutes, then slows down mixing speed to 60 revs/min hereinafter, bubble is discharged, make
Slurry, 3 to can be filled with investment shell intracavity for slurry after five minutes;
5th step fills type and solidification: above-mentioned slurry being filled with investment shell intracavity, 4 to 8 minutes is stood after filling type, is solidified into fusible pattern
Casting is with filling core material;
In above steps, 100-325 mesh fused quartz powder is the 100-325 mesh tekite of mass percent purity >=99.5%
Ying Fen, 50-100 mesh fused quartz powder are molten for 50-100 mesh fused quartz powder, the 20-50 mesh of mass percent purity >=99.5%
Fused silica powder be mass percent purity >=99.5% 20-50 mesh fused quartz powder, calcium aluminate be mass percent purity >=
99.5% calcium aluminate, ammonium chloride are the ammonium chloride of mass percent purity >=99.5%, silica solution is mass percent dioxy
SiClx content is the silica solution of 29%-31% and pH in 9.7-10.5.
8. moltening mold castings according to claim 7 fill core material preparation method for material, which is characterized in that
In step 1, the fused quartz powder 90g of calcium aluminate 30g, 100-325 mesh;
In step 2, ammonium chloride 50g, 100-325 mesh fused quartz powder 50g;
In step 3, fused quartz powder 160g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 350g, 50-100 mesh
Powder 146g, 28g powder 1,16g powder 2;
In step 4, silica solution 300g, surfactant 2g, defoaming agent 1g are evenly dispersed in silica solution, continue high-speed stirring
It mixes 2 minutes, then slows down mixing speed to 60 revs/min hereinafter, the bubble in slurry is discharged, it after five minutes can be by slurry
It is filled with investment shell intracavity;
In step 5,8 minutes are stood after filling type.
9. moltening mold castings according to claim 7 fill core material preparation method for material, which is characterized in that
In step 1,30g calcium aluminate, 100-325 mesh fused quartz powder 90g;
In step 2, ammonium chloride 50g, 100-325 mesh fused quartz powder 50g;
In step 3, fused quartz powder 175g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 300g, 50-100 mesh
Powder 175g, 32g powder 1,18g powder 2;
In step 4, silica solution 300g, surfactant 2g, defoaming agent 1g are evenly dispersed in silica solution, continue high-speed stirring
It mixes 1 minute, then slows down mixing speed to 60 revs/min hereinafter, the bubble in slurry is discharged, it can be by slurry after 4 minutes
It is filled with investment shell intracavity;
In step 5,6 minutes are stood after filling type.
10. moltening mold castings according to claim 7 fill core material preparation method for material, which is characterized in that
In step 1,30g calcium aluminate, 100-325 mesh fused quartz powder 90g;
In step 2, ammonium chloride 50g, 100-325 mesh fused quartz powder 50g;
In step 3, fused quartz powder 140g, 20-50 the mesh vitreous silica of 100-325 mesh fused quartz powder 370g, 50-100 mesh
Powder 130g, 40g powder 1,20g powder 2;
In step 4, silica solution 300g, surfactant 2g, defoaming agent 1g are evenly dispersed in silica solution, continue high-speed stirring
It mixes 1 minute, then slows down mixing speed to 60 revs/min hereinafter, the bubble in slurry is discharged, it can be by slurry after 3 minutes
It is filled with investment shell intracavity;
In step 5,4 minutes are stood after filling type.
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CN116532614A (en) * | 2023-04-12 | 2023-08-04 | 无锡环宇精密铸造有限公司 | Mold core for precision casting and preparation method thereof |
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