CN107737881A - A kind of preparation method of the titanium alloy graphite molds casting with small gaps - Google Patents
A kind of preparation method of the titanium alloy graphite molds casting with small gaps Download PDFInfo
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- CN107737881A CN107737881A CN201710842737.1A CN201710842737A CN107737881A CN 107737881 A CN107737881 A CN 107737881A CN 201710842737 A CN201710842737 A CN 201710842737A CN 107737881 A CN107737881 A CN 107737881A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/002—Removing cores by leaching, washing or dissolving
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A kind of preparation method of the titanium alloy graphite molds casting with small gaps, the cast of group type and the removal of ceramic core of the making of preparation, graphite mould including ceramic core, ceramic core and graphite mould, the ceramic core is using silica, graphite powder and plasticizer as raw material, it is molded through forming machine, high-temperature roasting, surface coated treatment, after baking are made, the coating that obtained ceramic core surface is formed is prevented to react between titanium liquid and ceramic core, and the removal of ceramic core is completed using depoling kettle.Titanium alloy casting of the method production with small gaps that the present invention is combined using processing graphite type with the ceramic core that special process makes, graphite mould titanium alloy casting of the solution with small gaps that can quickly, efficiently, inexpensive produces problem, lift surface finish of casting, the method that chemistry can be used simultaneously, reach the purpose for effectively removing ceramic core.
Description
Technical field
The invention belongs to titanium alloy graphite molds casting field, and in particular to a kind of titanium alloy graphite molds with small gaps
The preparation method of casting.
Background technology
The molding mode of titanium alloy casting mainly has precision-investment casting formed titanium alloy casting to be molded with processing graphite type
Titanium alloy casting.Precision-investment casting formed titanium alloy casting is primarily adapted for use in the field such as Aeronautics and Astronautics, medicine equipment size phase
To small thin-wall titanium alloy casting, the forming method is yielding for the larger titanium alloy casting of size and wall thickness while titanium liquid is easy
Reacted with formwork, cause surface quality of continuous castings poor, therefore the forming method is not suitable for the production of thick large titanium alloy casting.
Processing graphite mold casting forming method is particularly suitable for use in the production of thick large titanium alloy casting.But for the thickness with small gaps
For big titanium alloy graphite molds casting, the graphite core used in the narrow part position mold cavity forming is than narrow, it is difficult to processes, processes
Precision is not high and graphite core narrow and small when pouring is easily broken, it is difficult to mould casting small gaps position, while graphite core
It is broken in cast that cast-internal generation can be caused to be mingled with situation, reduce Internal Quality of Cast, the not high surface light of machining accuracy
Cleanliness difference causes casting small gaps inner surface finish low, and can not be polished because gap is narrow and small and cause surface finish of casting
Customer requirement is not reached.The current ceramic core of titanium alloy is zirconium base material at present, but casting is after producing, zirconia-based ceramic
Core removes more difficult, at present the method for machinery can only be used to remove, in narrow part bit-type chamber ceramic core plant equipment without
Method is entered, therefore ceramic core can be caused to remove sordid situation.
The content of the invention
It is an object of the invention to provide a kind of preparation method of the titanium alloy graphite molds casting with small gaps, using adding
Titanium alloy casting of the method production with small gaps that work graphite mould is combined with the ceramic core that special process makes, can be with
Quickly, graphite mould titanium alloy casting production problem of the solution efficiently, inexpensive with small gaps, lifting cast(ing) surface are bright and clean
Degree, while the method that can use chemistry, reach the purpose for effectively removing ceramic core.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：A kind of titanium with small gaps closes
The preparation method of golden graphite mould casting, including the preparation of ceramic core, the making of graphite mould, the group type of ceramic core and graphite mould
Cast and the removal of ceramic core, preparation of the ceramic core through raw material, forming machine shaping and high-temperature roasting are made, made
The ceramic core obtained carries out coating treatment before being poured into a mould with graphite mould group type, to the surface of ceramic core, to obtain treating group type
Ceramic core, the method for coating treatment are：
（1）According to parts by weight, 85 parts of oxidation yttrium powder is added in 15 parts of zirconium acetate solution and is stirred, stirring speed
Spend for 1500r/min, mixing time 1h, obtain coating paste；
（2）Obtained ceramic core after roasting is put into prepared coating paste and soaked, and by the ceramic core after immersion
Taking-up is put into 23 ± 4 DEG C of temperature, humidity 25%-40% constant-temperature constant-humidity environment, dries 24h；
（3）By the ceramic core that coating paste is hung with after drying be put into roaster carry out after baking, sintering temperature be 1050 DEG C,
Soaking time 6h, then it is furnace-cooled to 300 DEG C of opening fire doors and carries out air cooling, obtain treating the ceramic core of group type after the completion of air cooling.
Further, the ceramic core for coating treatment is prepared according to following steps：
（1）According to parts by weight, the silicon dioxide powder of 70-75 parts, the graphite powder of 5-10 parts and 20 parts of plasticizer conduct are measured
Raw material, wherein plasticizer uniformly mix gained by 93 parts of K512 waxes, 5 parts of K2683 waxes and 2 parts of polyethylene；
（2）The silicon dioxide powder measured, graphite powder are poured into drying receptacle and be thoroughly mixed, obtains mixed material, its
Middle mixing speed is 150r/min, mixing time 1h；
（3）Heating plasticizer dissolves it, it is ensured that its temperature control is within the scope of 110 DEG C ± 5 DEG C to be incubated 30min；
（4）Described mixed material is added in the plasticizer after dissolving with 100g/min speed, and stirred while adding, is stirred
It is 100r/min to mix speed, and 110 DEG C ± 5 DEG C of temperature is kept in whipping process, treats that all mixed materials are added completely into increasing
After moulding agent, continue to stir 5h, obtain shaping slurry；
（5）Ceramic core shaping metal die used is installed, ceramic core shaping forming machine used is injection (mo(u)lding) machine, will
Shaping slurry is poured into the material cylinder of injection (mo(u)lding) machine, by injection (mo(u)lding) machine hot briquetting slurry, make its temperature control 110 DEG C ±
In the range of 5 DEG C, then shaping slurry is expelled in metal die, injection pressure 5MPa and pressurize 20s, treats that it solidifies completely
The ceramic core after shaping is taken out afterwards；
（6）The environment that ceramic core after shaping is put into constant temperature and humidity is dried, and is put into after drying in roaster and carries out height
Temperature roasting, obtains the ceramic core for coating treatment after roasting.
Further, described high-temperature roasting method is：The roasting furnace temperature elevation is to 250 DEG C of insulation 1h, then with per small
The speed that 100 DEG C of Shi Shengwen is warming up to 1150 DEG C, and is incubated 3h, subsequent furnace cooling, when furnace temperature is down to 300 DEG C, opens stove
Door carries out air cooling, when being air-cooled to room temperature, takes out the ceramic core of kiln roasting shaping.
Further, soak time of the ceramic core in coating paste is 10min.
Further, before the ceramic core and the group type of graphite mould are poured into a mould, to the graphite mould made and through coating
The ceramic core of processing gained carries out a group type verification, and qualified graphite mould and ceramic core progress vacuum degassing are verified to group type
Processing, the vacuum of vacuum degassing stove need to be less than 0.009Pa, 900 DEG C ± 14 DEG C of outgassing temperature, soaking time 2h.
Further, the group type pouring procedure of the ceramic core and graphite mould is：Graphite after handling vacuum degassing
Type and ceramic core carry out mould assembly, melt titanium alloy solution, vacuum consumable electric arc skull crucible using vacuum consumable electric arc skull crucible
Vacuum is less than 0.009Pa, thawing electric current is 22-30KA, the titanium alloy solution after thawing is poured into the graphite mould after mould assembly,
With formed titanium alloy casting, and transported fire door is opened after its furnace cooling 1h.
Further, graphite mould is removed using mechanical means to titanium alloy graphite molds casting, closed with taking out be molded titanium
Golden casting, and the removal of ceramic core is completed using depoling kettle to titanium alloy casting, to obtain the titanium alloy with small gaps
Graphite mould casting, depoling pressure is 0.7Mpa, concentration of lye 40%, and depoling temperature is 150 DEG C, the depoling time is 20h.
Preferably, the oxidation yttrium powder is 325 mesh.
Preferably, the silicon dioxide powder and graphite powder are 325 mesh.
Compared with prior art, the beneficial effects of the invention are as follows：
First, present invention process route is novel, can effectively be solved with the method that ceramic core is combined using processing graphite type
Certainly have small gaps titanium alloy graphite molds casting technical bottleneck, can effectively lift surface quality of continuous castings, for
Small gaps high-volume graphite mould titanium alloy casting is especially suitable, can be with effectively save production cost；
Second, the present invention has carried out coating treatment so that ceramic core after ceramic core is prepared to the surface of ceramic core
Surface formed one layer of yttria coating, with prevent pour into a mould during, titanium liquid with oxidation silicon substrate ceramic core high temperature under
Intense reaction, also, when preparing ceramic core, plasticizer and graphite powder can be during high-temperature roastings in the raw material of use
Melt and reaction disappears, therefore the ceramic core after high-temperature roasting has small hole, these small holes can be ceramics
Whose surfaces coating increases adhesive force so that ceramic core face coat is more uniform, to ensure the performance of coating effect.
Embodiment
Below by specific embodiment, technical scheme and technique effect are further described.
The embodiment selected herein for the open purpose of the present invention, is presently considered to be suitable, but answer
Solution, it is contemplated that all changes and improvement including all embodiments belonged in this design and the scope of the invention.
Embodiment 1
A kind of preparation method of the titanium alloy graphite molds casting with small gaps, its step are as follows：
The preparation of the first step, ceramic core material：Measure 325 mesh silica 35kg, 325 mesh graphite powder 5kg, plasticizer
10kg, the plasticizer are uniformly mixed to prepare by K512 waxes 9.3kg, K2683 wax 0.5kg and polyethylene 0.2Kg；
Second step, 325 mesh silicon dioxide powders and 325 mesh graphite powders are poured into drying receptacle it is thoroughly mixed and mixed
Material, mixing speed 150r/min, mixing time 1h；
3rd step, heating plasticizer dissolve it, and ensured its temperature control within the scope of 110 DEG C ± 5 DEG C, are incubated
30min；
4th step, the mixed material obtained by second step is poured into the heating of the 3rd step in the plasticizer of melting state, pour into speed
For 100g/min, it is stirred while pouring into, mixing speed 100r/min, and 110 DEG C ± 5 is kept in whipping process
DEG C temperature, after all mixed materials are added completely into plasticizer, continue stir 5h so that slurry is sufficiently mixed, and is molded
Slurry；
5th step, injection moulding：The installation of the metal die of forming ceramic core is in place, and after being sufficiently stirred in the 4th step
Shaping slurry is poured into the material cylinder of injection (mo(u)lding) machine, and injection (mo(u)lding) machine is heated to ensure the temperature of shaping slurry at 110 DEG C ± 5
DEG C, shaping slurry is injected in metal die, injection pressure 5MPa and pressurize 20s, after taking out shaping after its completely solidification
Ceramic core；
6th step, high-temperature roasting：Injection molding ceramic core is put into the workshop of constant temperature and humidity and is dried, in workshop
Temperature is 24 ± 3 DEG C, humidity 25%-40%；Dried ceramic core is subjected to high-temperature roasting, to obtain being used for coating treatment
Ceramic core；The implementing process of high-temperature roasting is as follows：By roasting furnace temperature elevation to 250 DEG C of insulation 1h, then to heat up per hour
100 DEG C of speed is warming up to 1150 DEG C, and is incubated 3h, subsequent furnace cooling, when furnace temperature is down to 300 DEG C, opens fire door and carries out
Air cooling, when being air-cooled to room temperature, take out the ceramic core of kiln roasting shaping；Because plasticizer and graphite powder can melt after baking
And reaction disappear, therefore be calcined after ceramic core its there is small hole, the small hole can be ceramic core surface apply
Layer increase adhesive force；
The preparation of 7th step, ceramic core covercoat paste：Weigh 325 mesh oxidation yttrium powder 0.85Kg and zirconium acetate solution
0.15Kg, and 325 mesh oxidation yttrium powder is disposably poured into ready zirconium acetate solution, and entered with 1500r/min speed
Row stirring, mixing time 1h, obtains coating paste；
8th step, it will be put into through the ceramic core obtained by high-temperature roasting in the coating paste obtained by previous step and soak 10min, soaked
Ceramic core is taken out after bubble and is put into temperature as 23 ± 4 DEG C, humidity 25%-40% constant-temperature constant-humidity environment, dries 24h；
9th step, ceramic core after baking：Cated ceramic core will be hung after drying it is put into roaster and carries out secondary roasting
Burn, sintering temperature is 1050 DEG C, soaking time 6h, is then furnace-cooled to 300 DEG C of opening fire doors and carries out air cooling, is obtained after the completion of air cooling
Treat the ceramic core of group type；
Tenth step, processing graphite type：According to institute's mould casting requirement, the graphite mould needed for mould casting is rationally designed, passes through machine
Graphite block is processed into by the method for tool processing meets design shape, the graphite mould of dimension precision requirement；
11st step, graphite mould dimension control：Dimension control is carried out according to design drawing requirement to the graphite mould processed, really
Protect graphite mould and meet Design Requirement Drawing；
12nd step, ceramic core and the verification of graphite mould group type：To meet after processing the graphite mould of Design Requirement Drawing with it is secondary
Ceramic core after roasting carries out a group type verification, with the graphite mould no-float for ensureing ceramic core Yu being processed；
13rd step, vacuum degassing：Qualified graphite mould is verified to group type and ceramic core carries out vacuum degassing, vacuum degassing
Stove vacuum need to be less than 0.009Pa, 900 DEG C ± 14 DEG C of outgassing temperature, soaking time 2h；
14th step, the cast of group type：Mould assembly is carried out to the graphite mould and ceramic core of vacuum degassing processing, using use vacuum certainly
Power consumption arc skull crucible melts titanium alloy solution, and vacuum consumable electric arc skull crucible vacuum is less than 0.009Pa, thawing electric current is 22-
30KA, the titanium alloy solution after thawing is poured into the graphite mould after mould assembly, formed titanium alloy graphite mould casting, and by it with stove
Fire door is opened after cooling 1h to transport, and graphite mould is removed using mechanical means, takes out the titanium alloy casting of shaping；
15th step, remove ceramic core：The removal of ceramic core is completed using depoling kettle to titanium alloy casting, to be had
The titanium alloy graphite molds casting of small gaps, depoling pressure is 0.7Mpa, concentration of lye 40%, and depoling temperature is 150 DEG C, taken off
The core time is 20h.
Embodiment 2
A kind of preparation method of the titanium alloy graphite molds casting with small gaps, its step are as follows：
The preparation of the first step, ceramic core material：Measure 325 mesh silica 37.5kg, 325 mesh graphite powder 2.5kg, plasticizer
10kg, the plasticizer are uniformly mixed to prepare by K512 waxes 9.3kg, K2683 wax 0.5kg and polyethylene 0.2Kg；
Second step, 325 mesh silicon dioxide powders and 325 mesh graphite powders are poured into drying receptacle it is thoroughly mixed and mixed
Material, mixing speed 150r/min, mixing time 1h；
3rd step, heating plasticizer dissolve it, and ensured its temperature control within the scope of 110 DEG C ± 5 DEG C, are incubated
30min；
4th step, the mixed material obtained by second step is poured into the heating of the 3rd step in the plasticizer of melting state, pour into speed
For 100g/min, it is stirred while pouring into, mixing speed 100r/min, and 110 DEG C ± 5 is kept in whipping process
DEG C temperature, after all mixed materials are added completely into plasticizer, continue stir 5h so that slurry is sufficiently mixed, and is molded
Slurry；
5th step, injection moulding：The installation of the metal die of forming ceramic core is in place, and after being sufficiently stirred in the 4th step
Shaping slurry is poured into the material cylinder of injection (mo(u)lding) machine, and injection (mo(u)lding) machine is heated to ensure the temperature of shaping slurry at 110 DEG C ± 5
DEG C, shaping slurry is injected in metal die, injection pressure 5MPa and pressurize 20s, after taking out shaping after its completely solidification
Ceramic core；
6th step, high-temperature roasting：Injection molding ceramic core is put into the workshop of constant temperature and humidity and is dried, in workshop
Temperature is 24 ± 3 DEG C, humidity 25%-40%；Dried ceramic core is subjected to high-temperature roasting, to obtain being used for coating treatment
Ceramic core；The implementing process of high-temperature roasting is as follows：By roasting furnace temperature elevation to 250 DEG C of insulation 1h, then to heat up per hour
100 DEG C of speed is warming up to 1150 DEG C, and is incubated 3h, subsequent furnace cooling, when furnace temperature is down to 300 DEG C, opens fire door and carries out
Air cooling, when being air-cooled to room temperature, take out the ceramic core of kiln roasting shaping；Because plasticizer and graphite powder can melt after baking
And reaction disappear, therefore be calcined after ceramic core its there is small hole, the small hole can be ceramic core surface apply
Layer increase adhesive force；
The preparation of 7th step, ceramic core covercoat paste：Weigh 325 mesh oxidation yttrium powder 0.85Kg and zirconium acetate solution
0.15Kg, and 325 mesh oxidation yttrium powder is disposably poured into ready zirconium acetate solution, and entered with 1500r/min speed
Row stirring, mixing time 1h, obtains coating paste；
8th step, it will be put into through the ceramic core obtained by high-temperature roasting in the coating paste obtained by previous step and soak 10min, soaked
Ceramic core is taken out after bubble and is put into temperature as 23 ± 4 DEG C, humidity 25%-40% constant-temperature constant-humidity environment, dries 24h；
9th step, ceramic core after baking：Cated ceramic core will be hung after drying it is put into roaster and carries out secondary roasting
Burn, sintering temperature is to be warming up to 1050 DEG C with 100 DEG C of the speed of heating up per hour and be incubated 6h, is then furnace-cooled to 300 DEG C of openings
Fire door carries out air cooling, obtains treating the ceramic core of group type after the completion of air cooling；
Tenth step, processing graphite type：According to institute's mould casting requirement, the graphite mould needed for mould casting is rationally designed, passes through machine
Graphite block is processed into by the method for tool processing meets design shape, the graphite mould of dimension precision requirement；
11st step, graphite mould dimension control：Dimension control is carried out according to design drawing requirement to the graphite mould processed, really
Protect graphite mould and meet Design Requirement Drawing；
12nd step, ceramic core and the verification of graphite mould group type：To meet after processing the graphite mould of Design Requirement Drawing with it is secondary
Ceramic core after roasting carries out a group type verification, with the graphite mould no-float for ensureing ceramic core Yu being processed；
13rd step, vacuum degassing：Qualified graphite mould is verified to group type and ceramic core carries out vacuum degassing, vacuum degassing
Stove vacuum need to be less than 0.009Pa, 900 DEG C ± 14 DEG C of outgassing temperature, soaking time 2h；
14th step, the cast of group type：Mould assembly is carried out to the graphite mould and ceramic core of vacuum degassing processing, using use vacuum certainly
Power consumption arc skull crucible melts titanium alloy solution, and vacuum consumable electric arc skull crucible vacuum is less than 0.009Pa, thawing electric current is 22-
30KA, the titanium alloy solution after thawing is poured into the graphite mould after mould assembly, formed titanium alloy graphite mould casting, and by it with stove
Fire door is opened after cooling 1h to transport, and graphite mould is removed using mechanical means, takes out the titanium alloy casting of shaping；
15th step, remove ceramic core：The removal of ceramic core is completed using depoling kettle to titanium alloy casting, to be had
The titanium alloy graphite molds casting of small gaps, depoling pressure is 0.7Mpa, concentration of lye 40%, and depoling temperature is 150 DEG C, taken off
The core time is 20h.
The present invention uses overall process innovative technology design concept, by formulating rational ceramic core manufacture craft and full stream
The production technology scheme of journey.Ceramic core that the inventive method is produced and titanium alloy are suitable for having narrow without obvious reaction
The shaping of small gap position titanium alloy casting.Meanwhile the invention of the ceramic core can effectively lift the casting of small gaps position
The surface quality of part, while can effectively reduce the production cost with small gaps titanium alloy graphite molds casting batch.
Claims (9)
1. a kind of preparation method of the titanium alloy graphite molds casting with small gaps, include preparation, the graphite mould of ceramic core
Making, the cast of group type and the removal of ceramic core of ceramic core and graphite mould, preparation of the ceramic core through raw material,
Forming machine is molded and high-temperature roasting is made, it is characterised in that：Obtained ceramic core with graphite mould group type before pouring into a mould, to pottery
The surface of porcelain core carries out coating treatment, and to obtain treating the ceramic core of group type, the method for coating treatment is：
（1）According to parts by weight, 85 parts of oxidation yttrium powder is added in 15 parts of zirconium acetate solution and is stirred, stirring speed
Spend for 1500r/min, mixing time 1h, obtain coating paste；
（2）Obtained ceramic core after roasting is put into prepared coating paste and soaked, and by the ceramic core after immersion
Taking-up is put into 23 ± 4 DEG C of temperature, humidity 25%-40% constant-temperature constant-humidity environment, dries 24h；
（3）By the ceramic core that coating paste is hung with after drying be put into roaster carry out after baking, sintering temperature be 1050 DEG C,
Soaking time 6h, then it is furnace-cooled to 300 DEG C of opening fire doors and carries out air cooling, obtain treating the ceramic core of group type after the completion of air cooling.
2. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 1, its feature
It is：Ceramic core for coating treatment is prepared according to following steps：
（1）According to parts by weight, the silicon dioxide powder of 70-75 parts, the graphite powder of 5-10 parts and 20 parts of plasticizer conduct are measured
Raw material, wherein plasticizer uniformly mix gained by 93 parts of K512 waxes, 5 parts of K2683 waxes and 2 parts of polyethylene；
（2）The silicon dioxide powder measured, graphite powder are poured into drying receptacle and be thoroughly mixed, obtains mixed material, its
Middle mixing speed is 150r/min, mixing time 1h；
（3）Heating plasticizer dissolves it, it is ensured that its temperature control is within the scope of 110 DEG C ± 5 DEG C to be incubated 30min；
（4）Described mixed material is added in the plasticizer after dissolving with 100g/min speed, and stirred while adding, is stirred
It is 100r/min to mix speed, and 110 DEG C ± 5 DEG C of temperature is kept in whipping process, treats that all mixed materials are added completely into increasing
After moulding agent, continue to stir 5h, obtain shaping slurry；
（5）Ceramic core shaping metal die used is installed, ceramic core shaping forming machine used is injection (mo(u)lding) machine, will
Shaping slurry is poured into the material cylinder of injection (mo(u)lding) machine, by injection (mo(u)lding) machine hot briquetting slurry, make its temperature control 110 DEG C ±
In the range of 5 DEG C, then shaping slurry is expelled in metal die, injection pressure 5MPa and pressurize 20s, treats that it solidifies completely
The ceramic core after shaping is taken out afterwards；
（6）The environment that ceramic core after shaping is put into constant temperature and humidity is dried, and is put into after drying in roaster and carries out height
Temperature roasting, obtains the ceramic core for coating treatment after roasting.
3. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 1, its feature
It is：Described high-temperature roasting method is：The roasting furnace temperature elevation is to 250 DEG C of insulation 1h, then to heat up per hour 100 DEG C
Speed is warming up to 1150 DEG C, and is incubated 3h, subsequent furnace cooling, when furnace temperature is down to 300 DEG C, opens fire door and carries out air cooling, empty
When being cooled to room temperature, the ceramic core of kiln roasting shaping is taken out.
4. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 1, its feature
It is：Soak time of the ceramic core in coating paste is 10min.
5. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 1, its feature
It is：Before the ceramic core and the cast of the group type of graphite mould, to the graphite mould made and through the pottery obtained by coating treatment
Porcelain core carries out a group type verification, and qualified graphite mould and ceramic core progress vacuum degassing processing are verified to group type, and vacuum is removed
The vacuum of steam stove need to be less than 0.009Pa, 900 DEG C ± 14 DEG C of outgassing temperature, soaking time 2h.
6. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 5, its feature
It is：The group type pouring procedure of the ceramic core and graphite mould is：Graphite mould and ceramic core after handling vacuum degassing
Mould assembly is carried out, titanium alloy solution is melted using vacuum consumable electric arc skull crucible, vacuum consumable electric arc skull crucible vacuum is less than
0.009Pa, thawing electric current are 22-30KA, the titanium alloy solution after thawing are poured into the graphite mould after mould assembly, to be molded titanium conjunction
Golden casting, and transported fire door is opened after its furnace cooling 1h.
7. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 6, its feature
It is：Graphite mould is removed using mechanical means to titanium alloy graphite molds casting, to take out be molded titanium alloy casting, and to titanium
Alloy-steel casting completes the removal of ceramic core using depoling kettle, to obtain the titanium alloy graphite molds casting with small gaps, takes off
Core pressure is 0.7Mpa, concentration of lye 40%, and depoling temperature is 150 DEG C, the depoling time is 20h.
8. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 1, its feature
It is：The oxidation yttrium powder is 325 mesh.
9. a kind of preparation method of titanium alloy graphite molds casting with small gaps according to claim 2, its feature
It is：The silicon dioxide powder and graphite powder are 325 mesh.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112317695A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Casting method of marine reversible turbine blade |
| WO2022029388A1 (en) * | 2020-08-06 | 2022-02-10 | Safran | Protection against oxidation or corrosion of a hollow part made of a superalloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112317695A (en) * | 2020-11-05 | 2021-02-05 | 山东瑞泰新材料科技有限公司 | Casting method of marine reversible turbine blade |
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