CN105693254B - A kind of Water-soluble ceramic core material and the method for preparing Water-soluble ceramic core - Google Patents
A kind of Water-soluble ceramic core material and the method for preparing Water-soluble ceramic core Download PDFInfo
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- CN105693254B CN105693254B CN201610075261.9A CN201610075261A CN105693254B CN 105693254 B CN105693254 B CN 105693254B CN 201610075261 A CN201610075261 A CN 201610075261A CN 105693254 B CN105693254 B CN 105693254B
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Abstract
The invention belongs to precision casting technology, is related to a kind of Water-soluble ceramic core material and the method for preparing Water-soluble ceramic core.The Water-soluble ceramic core material of the present invention is made up of high temperature ceramic material, water-soluble inorganic salt and metal oxide, and at least one amorphous ceramic material.The preparation process of Water-soluble ceramic core of the present invention is：Pretreatment of raw material, raw material weighing, batch mixing, core moulding, degreasing and sintering, double sintering.The present invention proposes a kind of high performance Water-soluble ceramic core material and the method for preparing Water-soluble ceramic core, the performances such as the surface quality of core, dimensional accuracy, the level of getting angry, mechanical strength, heat resistance, water solubility, the feature of environmental protection can be taken into account, meet the needs of aluminium alloy research and production.
Description
Technical field
The invention belongs to precision casting technology, is related to a kind of Water-soluble ceramic core material and system for aluminium alloy castings
The method of standby Water-soluble ceramic core.
Background technology
Demand of the continuous lifting of aircraft equipment performance to complicated inner cavity structure, high quality and high-precision light alloy casting
Measure increasing.Aluminium alloy quality gently has excellent mechanical property simultaneously, therefore in Aeronautics and Astronautics, weapons and communications and transportation
It is widely used Deng field.The key of the aluminium alloy castings near-net-shape of the structure containing complicated inner cavity is that development is whole suitable for casting
The core material that body is molded without surplus, and core performance (mechanical property, thermal stability, chemical stability, surface quality,
Demoulding easy degree etc.) good and bad and Engineering Reliability height directly influences the qualification rate, casting cost and product matter of precision castings
Amount.At present, the high-temperature flame-proof ceramic core typically used, although excellent with high surface finish, high stability and high intensity etc.
Point, but need when it is removed in casting to soak in strong base solution or hydrofluoric acid, or by pressure depoling, on the one hand can cause
Serious environmental pollution, on the other hand can also infringement be produced to aluminium alloy castings, influence surface quality and dimensional accuracy.It is water-soluble
Intensity significantly reduces or highly defeated and dispersed after core meets water, it is easy to from casting without residually removing without special
Equipment, therefore enjoy the favor of complex structural member hot investment casting.Urea core and resin sand core widely used at present, heat resistance
Difference, gas forming amount are big, low intensity, cause that surface quality of continuous castings is poor, gas hole defect is more, deform and dimensional accuracy is low, have a strong impact on and answer
The product qualified rate of miscellaneous casting.Further to improve the production efficiency of precision casting, energy consumption is reduced, reduces cost, is badly in need of exploitation
A kind of core of higher performance.
Document and patent of the China about water-soluble core product and its application are considerably less, and this technology is in precision casting
The popularity rate applied in production is very low, and the water-soluble core reported mainly has water soluble salt core and Water-soluble ceramic core.
It is poor surface quality to be present in the former, low intensity, and depoling is difficult, it is necessary to substantial amounts of water rinses, and reclaims the shortcomings of difficult that (ceramic technology has
Limit the cores of responsible company based on salt and preparation method thereof:China, CN200980136389.X [P], 2011-8-17；Hu Nanjiang
Shore machine (group) Co., Ltd foundry water-soluble composite salt core materials, salt core preparation method and obtained salt core:In
State, CN201010218306.6 [P] .2010-10-27)；And the Water-soluble ceramic core based on refractory material, it is expected to obtain
Higher mechanical strength, refractoriness and chemical stability are obtained, and it is preferably water-soluble.This kind of Water-soluble ceramic core mainly with
Indissoluble refractory material such as aluminum oxide, zirconium silicate, silica etc. are base material, and soluble inorganic salt be (alkali metal or alkaline-earth metal
Chloride, carbonate or sulfate etc.) it is binding agent, it is made up of corresponding moulding process.But with regard to the report in current document
From the point of view of road and actual applicable cases (a kind of Water-soluble ceramic cores of Jiangsu University and preparation method thereof,
The wet compressive strength for the core that CN201210276204.9, the 2012-11-21. patent obtain is 0.025MPa, does compression strength
For 1.2MPa or so, low strength), the problems such as such core still has poor surface smoothness, low intensity, it is difficult in actual life
Promoted in production.The water for taking into account the performances such as the surface quality of core, the level of getting angry, mechanical strength, heat resistance, water solubility is not retrieved
The open source literature of dissolubility ceramic core material.
The content of the invention：
The purpose of the present invention is：It is proposed a kind of high performance Water-soluble ceramic core material and prepare Water-soluble ceramic core
Method, to take into account the surface quality of core, dimensional accuracy, the level of getting angry, mechanical strength, heat resistance, water solubility, the feature of environmental protection
Etc. performance, meet the needs of aluminium alloy research and production.
The technical scheme is that：A kind of Water-soluble ceramic core material, it is characterised in that：It is by refractory ceramics material
Material, water-soluble inorganic salt and metal oxide, and at least one amorphous ceramic material composition；Matter shared by water-soluble inorganic salt
It is 10%~50% to measure fraction；Mass fraction shared by water soluble metal oxide is 2%~50%；Shared by amorphous ceramic material
Mass fraction be 0.1%~30%；Surplus is high temperature ceramic material；Described high temperature ceramic material include aluminum oxide,
One of silica, zirconium oxide, magnesia, zinc oxide, spinelle, mullite, zircon, wollastonite, aluminium nitride, silicon nitride
Or the mixture of different materials, the powder size of high temperature ceramic material are the mesh of 50 mesh~8000；Described water-soluble inorganic salt
For sodium chloride, potassium chloride, potassium carbonate, sodium carbonate, calcium chloride, magnesium chloride, sodium sulphate, magnesium sulfate；Described water-soluble metal oxygen
Compound is calcium oxide；Described amorphous ceramic material includes one of amorphous silicon oxide, montmorillonite or diatomite or several
The mixture of material, the powder size of amorphous ceramic material are the mesh of 50 mesh~8000.
The preparation method of Water-soluble ceramic core as described above, it is characterised in that：The step of preparation, is as follows：
1st, pretreatment of raw material：
1.1st, high temperature ceramic material is put into Muffle furnace and is heated to 800 DEG C~1000 DEG C, be incubated 2h~5h；
1.2nd, by water-soluble inorganic salt, ball milling 1h~5h, selection pass through under the conditions of rotating speed 300r/min~600r/min
Powder after 120 eye mesh screens；
1.3rd, water soluble metal oxide is put into mortar and ground, chosen the powder after passing through 120 eye mesh screens, be put into horse
800 DEG C~1000 DEG C are not heated in stove, is incubated 1h~5h；
1.4th, amorphous ceramic material is put into Muffle furnace and is heated to 500 DEG C~800 DEG C, be incubated 2h~5h；
2nd, raw material weighing：Pretreated high temperature ceramic material, water-soluble inorganic salt, water-soluble metal are weighed in proportion
Oxide and amorphous ceramic material, prepare solid powder mixture；
3rd, batch mixing：
3.1st, pretreated high temperature ceramic material, water-soluble inorganic salt, water-soluble metal oxidation will be weighed in proportion
Thing, amorphous ceramic material are put into ball mill, and are put into expansible graphite, and the mass fraction of expansible graphite is above-mentioned raw materials solid
The 0.005%~0.05% of mixture of powders, the particle diameter of expansible graphite are the mesh of 100 mesh~200；Rotating speed 200r/min~
Ball milling 1h~5h under the conditions of 400r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Plasticizer is made up of paraffin, beeswax, polyethylene and stearic acid, and its mass fraction ratio is 88：
5：2：5；Load weighted paraffin is put into oil bath pan to melt at 80 DEG C, load weighted polyethylene is then added and is stirred in 120 DEG C of machineries
Mix to being completely dissolved, then sequentially add load weighted beeswax and stearic acid, stir 5min~10min；
3.3rd, by solid powder mixture add melting plasticizer in, under 120 DEG C of temperature conditionss mechanical agitation 1h~
Shared mass fraction is 10%~30% in the slurry for the slurry that 8h is uniformly mixed, wherein plasticizer；
4th, core moulding：
4.1st, the mould after cleaning is put into 20 DEG C~30 DEG C heating 0.5h~2h in baking oven；
4.2nd, by wax injector by injection-compression molding in slurry press-in die, pressure is 0.2MPa~1MPa, and die sinking obtains type
Core base substrate；
5th, degreasing and sintering：
5.1st, by core base substrate embedment equipped with alumina packing crucible in, be put into Muffle furnace with 1 DEG C/min~5 DEG C/
Min heating rate is heated to 200 DEG C of insulation 2h successively, is heated to 300 DEG C of insulation 2h, is heated to 400 DEG C of insulation 2h, is heated to
500 DEG C of insulation 2h；
5.2nd, 700 DEG C~900 DEG C insulation 1h~3h are continuously heating to 1 DEG C/min~10 DEG C/min heating rate, it
After cool to room temperature with the furnace；
6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, after cleaning
Core is put into Muffle furnace is warming up to 750 DEG C~950 DEG C insulation 0.5h~2h with 5 DEG C/min~10 DEG C/min heating rate,
Cool to room temperature with the furnace afterwards.
It is an advantage of the invention that：Propose a kind of high performance Water-soluble ceramic core material and prepare Water-soluble ceramic type
The method of core, the surface quality of core, dimensional accuracy, the level of getting angry, mechanical strength, heat resistance, water solubility, environmental protection can be taken into account
The performances such as property, meet the needs of research and production.
Embodiment
The present invention is described in further details below.A kind of Water-soluble ceramic core material, it is characterised in that：It is by resistance to
High-temperature ceramic materials, water-soluble inorganic salt and metal oxide, and at least one amorphous ceramic material composition；Water-soluble inorganic
Mass fraction shared by salt is 10%~50%；Mass fraction shared by water soluble metal oxide is 2%~50%；Amorphous is made pottery
Mass fraction shared by ceramic material is 0.1%~30%；Surplus is high temperature ceramic material；Described high temperature ceramic material bag
Include aluminum oxide, silica, zirconium oxide, magnesia, zinc oxide, spinelle, mullite, zircon, wollastonite, aluminium nitride, nitridation
The mixture of one of silicon or different materials, the powder size of high temperature ceramic material are the mesh of 50 mesh~8000；Described water
Soluble inorganic salt is sodium chloride, potassium chloride, potassium carbonate, sodium carbonate, calcium chloride, magnesium chloride, sodium sulphate, magnesium sulfate；Described water
Solube metallic oxide is calcium oxide；Described amorphous ceramic material includes amorphous silicon oxide, montmorillonite or diatomite wherein
One of or different materials mixture, the powder size of amorphous ceramic material is the mesh of 50 mesh~8000.
The preparation method of Water-soluble ceramic core as described above, it is characterised in that：The step of preparation, is as follows：
1st, pretreatment of raw material：
1.1st, high temperature ceramic material is put into Muffle furnace and is heated to 800 DEG C~1000 DEG C, be incubated 2h~5h；
1.2nd, by water-soluble inorganic salt, ball milling 1h~5h, selection pass through under the conditions of rotating speed 300r/min~600r/min
Powder after 120 eye mesh screens；
1.3rd, water soluble metal oxide is put into mortar and ground, chosen the powder after passing through 120 eye mesh screens, be put into horse
800 DEG C~1000 DEG C are not heated in stove, is incubated 1h~5h；
1.4th, amorphous ceramic material is put into Muffle furnace and is heated to 500 DEG C~800 DEG C, be incubated 2h~5h；
2nd, raw material weighing：Pretreated high temperature ceramic material, water-soluble inorganic salt, water-soluble metal are weighed in proportion
Oxide and amorphous ceramic material, prepare solid powder mixture；
3rd, batch mixing：
3.1st, pretreated high temperature ceramic material, water-soluble inorganic salt, water-soluble metal oxidation will be weighed in proportion
Thing, amorphous ceramic material are put into ball mill, and are put into expansible graphite, and the mass fraction of expansible graphite is above-mentioned raw materials solid
The 0.005%~0.05% of mixture of powders, the particle diameter of expansible graphite are the mesh of 100 mesh~200；Rotating speed 200r/min~
Ball milling 1h~5h under the conditions of 400r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Plasticizer is made up of paraffin, beeswax, polyethylene and stearic acid, and its mass fraction ratio is 88：
5：2：5；Load weighted paraffin is put into oil bath pan to melt at 80 DEG C, load weighted polyethylene is then added and is stirred in 120 DEG C of machineries
Mix to being completely dissolved, then sequentially add load weighted beeswax and stearic acid, stir 5min~10min；
3.3rd, by solid powder mixture add melting plasticizer in, under 120 DEG C of temperature conditionss mechanical agitation 1h~
Shared mass fraction is 10%~30% in the slurry for the slurry that 8h is uniformly mixed, wherein plasticizer；
4th, core moulding：
4.1st, the mould after cleaning is put into 20 DEG C~30 DEG C heating 0.5h~2h in baking oven；
4.2nd, by wax injector by injection-compression molding in slurry press-in die, pressure is 0.2MPa~1MPa, and die sinking obtains type
Core base substrate；
5th, degreasing and sintering：
5.1st, by core base substrate embedment equipped with alumina packing crucible in, be put into Muffle furnace with 1 DEG C/min~5 DEG C/
Min heating rate is heated to 200 DEG C of insulation 2h successively, is heated to 300 DEG C of insulation 2h, is heated to 400 DEG C of insulation 2h, is heated to
500 DEG C of insulation 2h；
5.2nd, 700 DEG C~900 DEG C insulation 1h~3h are continuously heating to 1 DEG C/min~10 DEG C/min heating rate, it
After cool to room temperature with the furnace；
6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, after cleaning
Core is put into Muffle furnace is warming up to 750 DEG C~950 DEG C insulation 0.5h~2h with 5 DEG C/min~10 DEG C/min heating rate,
Cool to room temperature with the furnace afterwards.
The preparation method of Water-soluble ceramic core as described above, it is characterised in that：Water-soluble ceramic core is carried out
Water repellent treatment, comprise the following steps that：
1st, organic solution is prepared：Prepare the epoxy resin or phenolic resin organic solution using acetone as solvent, the matter of resin
It is 10%~50% to measure fraction；
2nd, surface size：Core after sintering is immersed into 1min~5min in the organic solution prepared；
3rd, solidify：Core base substrate after starching is taken out, is put into 60 DEG C~200 DEG C heating 0.1h~1h solidifications of baking oven, so
Furnace cooling afterwards.
Water repellent treatment is carried out to core, to prevent its degradation between storage period, while increase core in atmosphere
Intensity be readily transported preservation.
Embodiment 1
A kind of Water-soluble ceramic core material, by alumina powder, sodium chloride, calcium oxide and the granularity that granularity is 2000 mesh
Formed for the amorphous silica powder of 500 mesh；Mass fraction wherein shared by alumina powder is 57%, shared by sodium chloride
Mass fraction is 30%, and the mass fraction shared by calcium oxide is 5%, and the mass fraction shared by amorphous silica is 8%.
By Water-soluble ceramic core material recited above prepare material Water-soluble ceramic core method, its prepare the step of such as
Under：
1st, pretreatment of raw material：
1.1st, alumina powder is put into Muffle furnace and is heated to 850 DEG C, be incubated 3h；
1.2nd, by sodium chloride, ball milling 1h, selection pass through the powder after 120 eye mesh screens under the conditions of rotating speed 500r/min；
1.3rd, calcium oxide is put into mortar and ground, chosen the powder after passing through 120 eye mesh screens, be put into Muffle furnace and heat
To 800 DEG C, 1h is incubated；
1.4th, amorphous silica powder is put into Muffle furnace and is heated to 800 DEG C, be incubated 3h；
2nd, raw material weighing：Weigh alumina powder 57g, sodium chloride 30g, lime powder 5g, SiO 2 powder 8g；
3rd, batch mixing：
3.1st, above raw material is put into ball mill, and is put into the expansible graphite 0.01g that particle diameter is 120 mesh, in rotating speed
Ball milling 1h under the conditions of 300r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Weigh paraffin 17.6g and be placed in stainless steel beaker, and in the thermostatical oil bath that temperature is 80 DEG C
Middle fusing, then adds polyethylene 0.4g, and in 120 DEG C of stirrings, treats that polyethylene is completely dissolved, and then adds beeswax 1.0g, hard
Resin acid 1.0g, stir 5min；
3.3rd, solid powder mixture is added in the plasticizer of melting, mechanical agitation 1h is obtained under 120 DEG C of temperature conditionss
To mixed uniformly slurry；
4th, core moulding：
4.1st, the mould after cleaning is put into 25 DEG C of heating 0.5h in baking oven；
4.2nd, injection-compression molding in slurry press-in die, pressure 1MPa, die sinking are obtained by core base substrate, chi by wax injector
Very little is long 120mm × wide 10mm × thick 4mm；
5th, degreasing and sintering：
5.1st, by crucible of the core base substrate embedment equipped with alumina packing, it is put into Muffle furnace with 2 DEG C/min heating
Speed is heated to 200 DEG C of insulation 2h successively, is heated to 300 DEG C of insulation 2h, is heated to 400 DEG C of insulation 2h, is heated to 500 DEG C of insulations
2h；
5.2nd, 800 DEG C of insulation 2h are continuously heating to 5 DEG C/min heating rate, cool to room temperature with the furnace afterwards；
6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, after cleaning
Core is put into Muffle furnace is warming up to 820 DEG C of insulation 1h with 5 DEG C/min heating rate, cools to room temperature with the furnace afterwards, obtains
Core sample after sintering, bending strength are about 10MPa.
Embodiment 2
A kind of Water-soluble ceramic core material, by alumina powder, potassium chloride, calcium oxide and the granularity that granularity is 200 mesh
Formed for the amorphous silica powder of 1000 mesh；Mass fraction wherein shared by alumina powder is 67%, shared by potassium chloride
Mass fraction be 20%, mass fraction shared by calcium oxide is 8%, and the mass fraction shared by amorphous silica is 5%.
By Water-soluble ceramic core material recited above prepare material Water-soluble ceramic core method, its prepare the step of such as
Under：
1st, pretreatment of raw material：
1.1st, alumina powder is put into Muffle furnace and is heated to 820 DEG C, be incubated 3h；
1.2nd, by potassium chloride, ball milling 1h, selection pass through the powder after 120 eye mesh screens under the conditions of rotating speed 500r/min；
1.3rd, calcium oxide is put into mortar and ground, chosen the powder after passing through 120 eye mesh screens, be put into Muffle furnace and heat
To 850 DEG C, 1h is incubated；
1.4th, amorphous silica powder is put into Muffle furnace and is heated to 800 DEG C, be incubated 3h；
2nd, raw material weighing：Weigh alumina powder 67g, potassium chloride 20g, lime powder 8g, SiO 2 powder 5g；
3rd, batch mixing：
3.1st, above raw material is put into ball mill, and is put into the expansible graphite 0.015g that particle diameter is 120 mesh, in rotating speed
Ball milling 1h under the conditions of 300r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Weigh paraffin 17.6g and be placed in stainless steel beaker, and in the thermostatical oil bath that temperature is 80 DEG C
Middle fusing, then adds polyethylene 0.4g, and in 120 DEG C of stirrings, treats that polyethylene is completely dissolved, and then adds beeswax 1.0g, hard
Resin acid 1.0g, stir 5min；
3.3rd, solid powder mixture is added in the plasticizer of melting, mechanical agitation 1h is obtained under 120 DEG C of temperature conditionss
To mixed uniformly slurry；
4th, core moulding：
4.1st, the mould after cleaning is put into 20 DEG C of heating 1h in baking oven；
4.2nd, injection-compression molding in slurry press-in die, pressure 1MPa, die sinking are obtained by core base substrate, chi by wax injector
Very little is long 120mm × wide 10mm × thick 4mm；
5th, degreasing and sintering：
5.1st, by crucible of the core base substrate embedment equipped with alumina packing, it is put into Muffle furnace with 3 DEG C/min heating
Speed is heated to 200 DEG C of insulation 3h successively, is heated to 300 DEG C of insulation 2h, is heated to 400 DEG C of insulation 2h, is heated to 500 DEG C of insulations
2h；
5.2nd, 780 DEG C of insulation 2h are continuously heating to 8 DEG C/min heating rate, cool to room temperature with the furnace afterwards；
6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, after cleaning
Core is put into Muffle furnace is warming up to 800 DEG C of insulation 1h with 8 DEG C/min heating rate, cools to room temperature with the furnace afterwards, obtains
Core sample after sintering, bending strength are about 8MPa.
Embodiment 3
A kind of Water-soluble ceramic core material, by alumina powder, sodium sulphate, calcium oxide and the granularity that granularity is 800 mesh
Formed for the amorphous silica powder of 2000 mesh；Mass fraction wherein shared by alumina powder is 52%, shared by sodium sulphate
Mass fraction be 35%, mass fraction shared by calcium oxide is 10%, and the mass fraction shared by amorphous silica is 3%.
By Water-soluble ceramic core material recited above prepare material Water-soluble ceramic core method, its prepare the step of such as
Under：
1st, pretreatment of raw material：
1.1st, alumina powder is put into Muffle furnace and is heated to 900 DEG C, be incubated 3h；
1.2nd, by sodium sulphate, ball milling 1h, selection pass through the powder after 120 eye mesh screens under the conditions of rotating speed 400r/min；
1.3rd, calcium oxide is put into mortar and ground, chosen the powder after passing through 120 eye mesh screens, be put into Muffle furnace and heat
To 900 DEG C, 1h is incubated；
1.4th, amorphous silica powder is put into Muffle furnace and is heated to 800 DEG C, be incubated 3h；
2nd, raw material weighing：Weigh alumina powder 52g, sodium sulphate 35g, lime powder 10g, SiO 2 powder 3g；
3rd, batch mixing：
3.1st, above raw material is put into ball mill, and is put into the expansible graphite 0.015g that particle diameter is 120 mesh, in rotating speed
Ball milling 1h under the conditions of 300r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Weigh paraffin 17.6g and be placed in stainless steel beaker, and in the thermostatical oil bath that temperature is 80 DEG C
Middle fusing, then adds polyethylene 0.4g, and in 120 DEG C of stirrings, treats that polyethylene is completely dissolved, and then adds beeswax 1.0g, hard
Resin acid 1.0g, stir 5min；
3.3rd, solid powder mixture is added in the plasticizer of melting, mechanical agitation 1h is obtained under 120 DEG C of temperature conditionss
To mixed uniformly slurry；
4th, core moulding：
4.1st, the mould after cleaning is put into 30 DEG C of heating 0.5h in baking oven；
4.2nd, injection-compression molding in slurry press-in die, pressure 0.3MPa, die sinking are obtained by core base substrate by wax injector；
5th, degreasing and sintering：
5.1st, by crucible of the core base substrate embedment equipped with alumina packing, it is put into Muffle furnace with 1 DEG C/min heating
Speed is heated to 200 DEG C of insulation 2h successively, is heated to 300 DEG C of insulation 2h, is heated to 400 DEG C of insulation 2h, is heated to 500 DEG C of insulations
2h；
5.2nd, 880 DEG C of insulation 2h are continuously heating to 10 DEG C/min heating rate, cool to room temperature with the furnace afterwards；
6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, after cleaning
Core is put into Muffle furnace is warming up to 900 DEG C of insulation 1h with 10 DEG C/min heating rate, cools to room temperature with the furnace afterwards, obtains
Core sample after sintering.
The preparation method of Water-soluble ceramic core as described above, it is characterised in that：Water-soluble ceramic core is carried out
Water repellent treatment, comprise the following steps that：
1st, organic solution is prepared：The epoxy resin organic solution using acetone as solvent is prepared, the mass fraction of resin is
20%；
2nd, surface size：Core after double sintering is immersed into 3min in organic solution；
3rd, solidify：Core base substrate after starching is taken out, 80 DEG C of heating 1h solidifications of baking oven is put into, then furnace cooling, obtains
The core sample strength arrived is high, easy to maintain.
Embodiment 4
A kind of Water-soluble ceramic core material, by alumina powder, sodium chloride, calcium oxide and the granularity that granularity is 3000 mesh
Formed for the amorphous silica powder of 1200 mesh；Mass fraction wherein shared by alumina powder is 55%, shared by sodium chloride
Mass fraction be 32%, mass fraction shared by calcium oxide is 8%, and the mass fraction shared by amorphous silica is 5%.
By Water-soluble ceramic core material recited above prepare material Water-soluble ceramic core method, its prepare the step of such as
Under：
1st, pretreatment of raw material：
1.1st, alumina powder is put into Muffle furnace and is heated to 850 DEG C, be incubated 4h；
1.2nd, by sodium chloride, ball milling 2h, selection pass through the powder after 120 eye mesh screens under the conditions of rotating speed 500r/min；By oxygen
Change calcium, which is put into mortar, to be ground, and is chosen the powder after passing through 120 eye mesh screens, is put into Muffle furnace and is heated to 800 DEG C, is incubated 1h；
1.3rd, amorphous silica powder is put into Muffle furnace and is heated to 800 DEG C, be incubated 3h；
2nd, raw material weighing：Weigh alumina powder 275g, sodium chloride 160g, lime powder 40g, SiO 2 powder
25g；
3rd, batch mixing：
3.1st, above raw material is put into ball mill, and is put into the expansible graphite 0.08g that particle diameter is 120 mesh, in rotating speed
Ball milling 3h under the conditions of 300r/min obtains solid powder mixture until uniformly mixing；
3.2nd, plasticizer is prepared：Weigh paraffin 88g and be placed in stainless steel beaker, and in the thermostatical oil bath that temperature is 80 DEG C
Fusing, polyethylene 2g is then added, and is stirred at 120 DEG C, treated that polyethylene is completely dissolved, then add beeswax 5g, stearic acid 5g,
Stir 10min；
3.3rd, solid powder mixture is added in the plasticizer of melting, mechanical agitation 3h is obtained under 120 DEG C of temperature conditionss
To mixed uniformly slurry；
4th, core moulding：
4.1st, the mould after cleaning is put into 25 DEG C of heating 1h in baking oven；
4.2nd, injection-compression molding in slurry press-in die, pressure 1MPa, die sinking are obtained by core base substrate by wax injector；
5th, degreasing and sintering：
5.1st, by crucible of the core base substrate embedment equipped with alumina packing, it is put into Muffle furnace with 2 DEG C/min heating
Speed is heated to 200 DEG C of insulation 4h successively, is heated to 300 DEG C of insulation 3h, is heated to 400 DEG C of insulation 3h, is heated to 500 DEG C of insulations
3h；
5.2nd, 800 DEG C of insulation 2h are continuously heating to 5 DEG C/min heating rate, cool to room temperature with the furnace afterwards；
6th, the core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, the core after cleaning is put into
820 DEG C of insulation 1h are warming up to 10 DEG C/min heating rate in Muffle furnace, room temperature are cooled to the furnace afterwards, after being sintered
Core sample.
The preparation method of Water-soluble ceramic core as described above, it is characterised in that：Water-soluble ceramic core is carried out
Water repellent treatment, comprise the following steps that：
1st, organic solution is prepared：The phenolic resin organic solution using acetone as solvent is prepared, the mass fraction of resin is
30%；
2nd, surface size：Core after double sintering is immersed into 5min in organic solution；
3rd, solidify：Core base substrate after starching is taken out, 100 DEG C of heating 2h solidifications of baking oven is put into, then furnace cooling, obtains
The core sample strength arrived is high, easy to maintain.
Claims (3)
- A kind of 1. Water-soluble ceramic core material, it is characterised in that：It is by high temperature ceramic material, water-soluble inorganic salt and metal Oxide, and at least one amorphous ceramic material composition；Mass fraction shared by water-soluble inorganic salt is 10%~50%；Water Mass fraction shared by solube metallic oxide is 2%~50%；Mass fraction shared by amorphous ceramic material for 0.1%~ 30%；Surplus is high temperature ceramic material；Described high temperature ceramic material includes aluminum oxide, silica, zirconium oxide, oxidation The mixing of one of magnesium, zinc oxide, spinelle, mullite, zircon, wollastonite, aluminium nitride, silicon nitride or different materials Thing, the powder size of high temperature ceramic material are the mesh of 50 mesh~8000；Described water-soluble inorganic salt be sodium chloride, potassium chloride, Potassium carbonate, sodium carbonate, calcium chloride, magnesium chloride, sodium sulphate, magnesium sulfate；Described water soluble metal oxide is calcium oxide；It is described Amorphous ceramic material include the mixtures of one of amorphous silicon oxide, montmorillonite or diatomite or different materials, amorphous The powder size of ceramic material is the mesh of 50 mesh~8000.
- A kind of 2. preparation method of Water-soluble ceramic core as claimed in claim 1, it is characterised in that：The step of preparation, is such as Under：2.1st, pretreatment of raw material：2.1.1, high temperature ceramic material is put into Muffle furnace and is heated to 800 DEG C~1000 DEG C, is incubated 2h~5h；2.1.2, by water-soluble inorganic salt, ball milling 1h~5h, selection pass through 120 under the conditions of rotating speed 300r/min~600r/min Powder after eye mesh screen；2.1.3, water soluble metal oxide is put into mortar and ground, the powder after passing through 120 eye mesh screens is chosen, is put into Muffle 800 DEG C~1000 DEG C are heated in stove, is incubated 1h~5h；2.1.4, amorphous ceramic material is put into Muffle furnace and is heated to 500 DEG C~800 DEG C, is incubated 2h~5h；2.2nd, raw material weighing：Pretreated high temperature ceramic material, water-soluble inorganic salt, water-soluble metal oxygen are weighed in proportion Compound and amorphous ceramic material；2.3rd, batch mixing：2.3.1, will weigh in proportion pretreated high temperature ceramic material, water-soluble inorganic salt, water soluble metal oxide, Amorphous ceramic material is put into ball mill, and is put into expansible graphite, and the mass fraction of expansible graphite is above-mentioned raw materials solid powder The 0.005%~0.05% of last mixture, the particle diameter of expansible graphite are the mesh of 100 mesh~200；Rotating speed 200r/min~ Ball milling 1h~5h under the conditions of 400r/min obtains solid powder mixture until uniformly mixing；2.3.2, prepare plasticizer：Plasticizer is made up of paraffin, beeswax, polyethylene and stearic acid, and its mass fraction ratio is 88：5： 2：5；Load weighted paraffin is put into oil bath pan to melt at 80 DEG C, then adds load weighted polyethylene in 120 DEG C of mechanical agitations To being completely dissolved, load weighted beeswax and stearic acid are then sequentially added, stirs 5min~10min；2.3.3, solid powder mixture is added in the plasticizer of melting, mechanical agitation 1h~8h under 120 DEG C of temperature conditionss Shared mass fraction is 10%~30% in the slurry for the slurry being uniformly mixed, wherein plasticizer；2.4th, core moulding：2.4.1 the mould after cleaning, is put into 20 DEG C~30 DEG C heating 0.5h~2h in baking oven；2.4.2, by wax injector by injection-compression molding in slurry press-in die, pressure is 0.2MPa~1MPa, and die sinking obtains core Base substrate；2.5th, degreasing and sintering：2.5.1, by crucible of the core base substrate embedment equipped with alumina packing, it is put into Muffle furnace with 1 DEG C/min~5 DEG C/min Heating rate be heated to successively 200 DEG C insulation 1h~5h, be heated to 300 DEG C insulation 1h~5h, be heated to 400 DEG C insulation 1h~ 5h, it is heated to 500 DEG C of insulation 1h~5h；2.5.2 700 DEG C~900 DEG C insulation 1h~3h, are continuously heating to 1 DEG C/min~10 DEG C/min heating rate, afterwards Cool to room temperature with the furnace；2.6th, double sintering：The core after oversintering is taken out from buried powder, and surface is cleared up with hairbrush, by the type after cleaning Core is put into Muffle furnace is warming up to 750 DEG C~950 DEG C insulation 0.5h~2h with 5 DEG C/min~10 DEG C/min heating rate, it After cool to room temperature with the furnace.
- 3. the preparation method of Water-soluble ceramic core as claimed in claim 2, it is characterised in that：Water-soluble ceramic core is entered Row water repellent treatment, is comprised the following steps that：3.1st, organic solution is prepared：Prepare the epoxy resin or phenolic resin organic solution using acetone as solvent, the quality of resin Fraction is 10%~50%；3.2nd, surface size：Core after double sintering is immersed into 1min~5min in the organic solution prepared；3.3rd, solidify：Core base substrate after starching is taken out, is put into 60 DEG C~200 DEG C heating 0.1h~1h solidifications of baking oven, then Furnace cooling.
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