CN106734852B - A kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal - Google Patents
A kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal Download PDFInfo
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- CN106734852B CN106734852B CN201611197524.XA CN201611197524A CN106734852B CN 106734852 B CN106734852 B CN 106734852B CN 201611197524 A CN201611197524 A CN 201611197524A CN 106734852 B CN106734852 B CN 106734852B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 239000000919 ceramic Substances 0.000 title claims abstract description 26
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000007711 solidification Methods 0.000 title claims abstract description 23
- 230000008023 solidification Effects 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 title claims abstract description 19
- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims abstract description 76
- 239000002002 slurry Substances 0.000 claims abstract description 69
- 239000001993 wax Substances 0.000 claims abstract description 36
- 238000000576 coating method Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000002344 surface layer Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000012188 paraffin wax Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 140
- 239000000377 silicon dioxide Substances 0.000 claims description 50
- 239000004576 sand Substances 0.000 claims description 41
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000080 wetting agent Substances 0.000 claims description 29
- 239000002518 antifoaming agent Substances 0.000 claims description 28
- 229910044991 metal oxide Inorganic materials 0.000 claims description 13
- 150000004706 metal oxides Chemical class 0.000 claims description 13
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical group CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 3
- 239000011812 mixed powder Substances 0.000 claims description 3
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 3
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 3
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000006386 neutralization reaction Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 14
- 238000009749 continuous casting Methods 0.000 abstract description 6
- 239000002826 coolant Substances 0.000 abstract description 6
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 40
- 238000005266 casting Methods 0.000 description 26
- 238000007667 floating Methods 0.000 description 18
- 239000003110 molding sand Substances 0.000 description 17
- 239000007921 spray Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000009415 formwork Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of preparation methods of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal, belong to ceramic shell preparation technical field.This method includes the configuration of surface layer slurry, the selection of reinforcing layer slurry preparation, sanding material, the roasting for being coated with operation, the dewaxing of shell and shell of shell；Wherein: being coated in operating process: being coated with the one week reservation 5mm height in bottom during first four layers in wax pattern side and be not coated with coating；The paraffin paper of 0.5~1mm thickness is covered on to the position for not being coated with coating after the 4th coating is dry, is then coated with again several layers of below.This method blocks contact of the liquid-metal-coolant with inner casts by shell preparation process, increasing by one layer of intermetallic metal interlayer, so as to improve surface quality of continuous castings.
Description
Technical field
The present invention relates to ceramic shell preparation technical fields, and in particular to a kind of anti-sticking tin liquid metal cooling (LMC) is fixed
To the preparation method of solidification ceramic shell.
Background technique
The temperature gradient in solid, liquid interface forward position significantly affects the microstructure of casting, intensity during directional solidification casting
And quality.High temperature gradient and setting rate can make that cast structure is fine and closely woven, defect is less.It is fixed with the increase tradition of casting length
It can be significantly reduced with the temperature gradient in solidification, lead to easily occur the defects of shrinkage cavity, spot, equiax crystal in casting.LMC orientation
It uses low-melting-point metal for cooling medium in solidification, formwork is directly pulled in low-melting-point metal bath, due to liquid metal and mould
The coefficient of heat transfer is very big between shell, and heat is taken away by heat transfer always, considerably increase temperature gradient in casting solidification process and
Cooling rate, and the temperature gradient of solid liquid interface is influenced very little, setting rate by casting dimension in entire directional solidification process
Fastly, it is especially suitable for the manufacture of large scale orientation and single crystal blade.
In LMC directional solidification, ceramic shell mould is directly drawn into 300 DEG C or so molten from 1500 DEG C or more of high temperature furnace
Pond, mould shell temperature change dramatically, therefore very high requirement is proposed to the thermal shock resistance of formwork；Furthermore large-scale orientation casting
Size is big, and the weight for being poured high temperature alloy is up to 20Kg or so, is influenced by alloy hydraulic coupling, and formwork is easy to become at high temperature
Shape even cracks, this requires formwork intensity with higher.
High temperature alloy is commonly using mullite as the A1 of principal crystalline phase2O3-SiO2System sintered refractory material shell, in liquid gold
When belonging to cooling directional solidification, since temperature gradient is larger, cracking or softening transform are often generated, it is viscous in turn result in liquid cooling medium
It is attached to cast(ing) surface, removal is difficult.Therefore, it is badly in need of exploring a kind of new process improvement Shell cracking, prevents liquid metal is cooling to be situated between
Matter is adhered to cast(ing) surface, prepares a kind of casting of novel high-temperature alloy and is become in research and production with anti-sticking tin ceramic shell and is badly in need of
It solves the problems, such as.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation sides of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal
Method, this method can improve Shell cracking, prevent metal cooling medium from adhering to cast(ing) surface, and guarantee surface quality of continuous castings.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal, this method includes following step
It is rapid:
(1) surface layer slurry preparation:
Surface layer slurry composition is EC95, metal oxide, silica solution 830, wetting agent and defoaming agent；Each component ratio are as follows:
The weight ratio of silica solution and EC95 are 1:(3.5~4.25), the volume of wetting agent is the 0.1~0.15% of silica solution volume,
The volume of defoaming agent is the 0.1~0.15% of silica solution volume, and the weight of metal oxide accounts for the 2~5% of silica solution weight；
(2) reinforcing layer slurry preparation:
Reinforcing layer slurry group becomes silica solution 1430, wetting agent, defoaming agent and EC95；Each component ratio are as follows: silica solution with
The weight ratio of EC95 is 1:(1.5~1.75), the volume of wetting agent is the 0.1%~0.15% of silica solution volume, defoaming agent
Volume be silica solution volume 0.1%~0.15%；
(3) sanding material selects EC95 sand；
(4) shell is coated with operation:
Wax pattern first layer is coated with surface layer slurry, and the wax pattern second layer is coated with surface layer slurry or reinforcing layer slurry；Wax pattern third layer
And reinforcing layer slurry is all coated with after third layer；Wherein: retaining 5mm high in the lower part of wax pattern lateral surface during being coated with first four layers
Degree is not coated with coating；The paraffin paper of 0.5~1mm thickness is covered on to the position (paraffin paper for not being coated with coating after the 4th coating is dry
Around wax pattern lower part one week), then it is coated with several coatings below again on the entire outer surface of wax pattern；
(5) dewaxing of shell:
The shell prepared is dewaxed with high pressure dewaxing kettle, pressure control is 0.6~0.7MPa, temperature 165~170
DEG C, the dewaxing time is 15~20 minutes；
(6) roasting of shell:
Shell after dewaxing lies on furnace base plate and is roasted, and 880-920 DEG C of maturing temperature, calcining time >=2 are small
When；The cooling directional solidification ceramic shell of the anti-sticking tin liquid metal is obtained after roasting.
In above-mentioned steps (1), surface layer slurry process for preparation are as follows: pour into quantitative silica solution in paint can, then in proportion
Wetting agent and defoaming agent are sequentially added, then starts to stir and be slowly added under agitation EC95, after stirring 2 hours, add
Enter metal oxide and continue stirring 2 hours, measures viscosity 1-2 times (viscosity should be slightly bigger than regulation viscosity) in whipping process and pour into again
Continuing 24 hours rears of stirring in L-type blender can be used, and viscosity is controlled in 35~40s.
In above-mentioned steps (1), mixed powder that the metal oxide is made of tungsten oxide, chromium oxide and molybdenum oxide.
In above-mentioned steps (2), reinforcing layer slurry preparation process are as follows: quantitative silica solution is poured into paint can, is added
Then wetting agent and defoaming agent start blender and are slowly added to EC95 while stirring, measurement viscosity 1-2 times (answer by viscosity in stirring
Slightly larger than regulation viscosity), stirring uses after 2 hours, and viscosity is controlled in 12~18s.
The wetting agent is JFC, and defoaming agent is n-octyl alcohol.
In above-mentioned steps (3), the granularity of the EC95 sand is 80#, 60#, 46# or 24#.
In above-mentioned steps (6) roasting process, allow to enter furnace lower than 500 DEG C, to soaking time after allow blow-on door to cool down.
The invention has the benefit that in wax pattern lateral surface when the present invention in shell preparation process, is coated with first four layers
Lower part retains 5mm height and is not coated with coating；By the paraffin paper of 0.5~1mm thickness around wax pattern lower part one week after the 4th coating is dry
It pastes, is then coated with several coatings below again；The position that shell pastes paraffin paper after dewaxing process also removes therewith, is formed and is cast
The jacket space that part type chamber is connected；It is also filled with jacket space while molten metal injection type chamber in casting process, after casting
The metallic spacer being connected with casting is formed in the jacket space, the metallic spacer is consistent with casting molten metal, therefore does not have
Pollute virgin metal liquid.Meanwhile connecing for liquid-metal-coolant and inner casts is blocked by increasing by one layer of intermetallic metal interlayer
Touching, so as to improve surface quality of continuous castings.The metallic spacer can be removed by machining mode after casting.
Detailed description of the invention
Fig. 1 is to be coated in operation to reserve metallic spacer layer schematic diagram.
Fig. 2 is the ceramic shell casting of 1 technique of comparative example preparation.
Fig. 3 is the ceramic shell casting of 2 technique of comparative example preparation.
Fig. 4 is the ceramic shell casting of 1 technique of embodiment preparation.
Fig. 5 is that certain model directional vane testpieces is compared through surface quality of continuous castings before and after 1 process modification of embodiment；Wherein:
(a) before improving；(b) after improving.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and embodiments.
The present invention is the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal, this method process are as follows:
Surface layer slurry preparation, reinforcing layer slurry preparation, sanding material selection, shell are coated with operation, the dewaxing of shell and the roasting of shell
It burns；Wherein: shell is coated in operating process, is retained 5mm height in the lower part of wax pattern lateral surface when being coated with first four layers and is not coated with
Coating (as shown in Figure 1)；The paraffin paper of 0.5~1mm thickness is covered on after the 4th coating is dry be not coated with coating position (around
Wax pattern bottom one week), then it is coated with several coatings below again on the entire outer surface of wax pattern；This is coated with mode by increasing by one
The space for the wax-pattern formation metallic spacer layer that layer is connected with wax part matrix, by 0.5~1mm fat pipe by wax disk(-sc) and wax part matrix
Connection both can remove external wax disk(-sc) in dewaxing process in this way, it is de- can also to realize that molten metal enters wax disk(-sc) in casting process
Cavity is formed after wax and forms separation layer, most importantly ensure that separation layer molten metal is consistent with casting molten metal, without dirt
Contaminate virgin metal liquid.Increase by one layer of intermetallic metal interlayer and blocks contact of the liquid-metal-coolant with inner casts, so as to improve
Surface quality of continuous castings.
The mixed powder that metal oxide in following example is made of tungsten oxide, chromium oxide and molybdenum oxide.
Comparative example 1
The preparation process of the present embodiment ceramic shell is as follows:
1, investment precoat is prepared, is getting out EC95 (320 mesh) powder, silica solution (830), wetting agent (JFC), defoaming agent (just
Octanol), metal oxide；Configuration proportion is silica solution and EC95 (320 mesh) weight ratio is 1:4, and wetting agent, defoaming agent are silicon
Sol volume 0.12%；Quantitative silica solution is poured into paint can, then is proportionally added into wetting agent and defoaming agent, is started simultaneously
Blender is slowly added to EC95 (320 mesh) while stirring, and after mixing time is greater than 2 hours, it is small that addition oxidate powder continues stirring 2
When, measurement viscosity one to secondary (viscosity should be slightly bigger than regulation viscosity) pours into L-type blender that continue stirring 24 small again in stirring
Shi Houfang can be used.35~40s of viscosity requirement.
2, reinforced layered slurry is prepared, reinforcing layer configuration proportion is that silica solution (1430) and EC95 (320 mesh) weight ratio is about
Are as follows: 1:1.60, wetting agent, defoaming agent are the 0.12% of silica solution volume；Quantitative silica solution is poured into paint can, then plus
Enter wetting agent and defoaming agent, while starting blender and being slowly added to while stirring EC95 (320 mesh), in stirring measure viscosity one to
Secondary (viscosity should be slightly bigger than regulation viscosity), mixing time, which is greater than 2 hours rears, can be used, and viscosity is controlled in 12~18s.
3, the wax pattern organized is carried out being coated with operation, first layer is coated with investment precoat, 35~40s of viscosity requirement, and stucco is wanted
80#EC95 molding sand is sought, the handle or sprue cup of mould group are held, is slowly immersed in surface layer slurry, mould group is taken out after 10~15s, is made
Extra slurry instills in slurry bucket, gently blows away blind hole with spray gun, the bubble of narrow slot makes each position of mould group equably cover one
Mould group after repeating above operation, is sent into sand sprinkling machine (manual hanging sand) interior hanging sand, the hanging sand time is about 10 seconds, then by layered material slurry
Mould group is hung over and is spontaneously dried 13~16 hours on mould group frame.The second layer is coated with reinforced layered slurry, and 16~18s of viscosity requirement is spread
Sand requires 80#EC95 molding sand, gently blows the floating sand of investment precoat off with spray gun first, emphasis is to blow the positions such as slot, hole, gap off
Floating sand after immerse in silica solution again, leaching can take out rapidly for silica solution about 2 seconds, control extra silica solution after immerse two layered materials
Slurry operates coplanar layer operation, hangs over mould group after hanging sand 5~7 hours dry on closing rail suspending conveyer.Third layer, which is coated with, to be added
Gu coating, 12~15s of viscosity requirement, stucco require 60#EC95 molding sand, gently blow the floating sand of upper coating off with spray gun, weight
Point is after blowing the floating sand at the positions such as slot, hole, gap off, remaining is the same as the first layer operation.4th layer is coated with reinforced layered slurry, and operation is same
Third layer, stucco require 46#EC95 molding sand.It coats layer 5 to the 8th coating and applies reinforced layered slurry, operate same third layer, spread
Sand requires 24#EC95 molding sand.9th layer of slurry seal, gently blows the floating sand of upper coating off with spray gun, and emphasis is to blow slot, hole, seam off
After the floating sand at the positions such as gap, the handle or sprue cup of mould group are held, slowly immerses in reinforcing layer slurry, mould is taken out after 10~15s
Group instills extra slurry in slurry bucket, gently blows away blind hole with spray gun, the bubble of narrow slot makes each position of mould group equably
Layered material slurry is covered, is then hung over mould group 5~7 hours dry on closing rail suspending conveyer.Drying time is greater than 24 hours.
4, the dewaxing of shell
The shell prepared is dewaxed with high pressure dewaxing kettle, pressure is controlled in 0.6~0.7MPa, temperature 165~170
DEG C, the dewaxing time is 15~20 minutes.
5, the roasting of shell
Shell is lain on furnace base plate, maturing temperature: 900 DEG C ± 20 DEG C, time >=2 hour allow to enter lower than 500 DEG C
Furnace, to soaking time after allow blow-on door cool down.
6, Fig. 2 casting under technique thus, from figure 2 it can be seen that glue tin situation more serious for casting.
Comparative example 2
The preparation process of the present embodiment ceramic shell is as follows:
1, investment precoat is prepared, is getting out EC95 (320 mesh) powder, silica solution (830), wetting agent (JFC), defoaming agent (just
Octanol), oxide；Configuration proportion is silica solution and EC95 (320 mesh) weight ratio is 1:4, and wetting agent, defoaming agent are silica solution
Volume 0.12%；Quantitative silica solution is poured into paint can, then is proportionally added into wetting agent and defoaming agent, while starting stirring
Machine is slowly added to EC95 (320 mesh) while stirring, and after mixing time is greater than 2 hours, it is small that addition metal oxide powder continues stirring 2
When, measurement viscosity one to secondary (viscosity should be slightly bigger than regulation viscosity) pours into L-type blender that continue stirring 24 small again in stirring
Shi Houfang can be used.35~40s of viscosity requirement.
2, reinforced layered slurry is prepared, reinforcing layer configuration proportion is that silica solution (1430) and EC95 (320 mesh) weight ratio is about
Are as follows: 1:1.6, wetting agent, defoaming agent are the 0.12% of silica solution volume；Quantitative silica solution is poured into paint can, then plus
Enter wetting agent and defoaming agent, while starting blender and being slowly added to while stirring EC95 (320 mesh), in stirring measure viscosity one to
Secondary (viscosity should be slightly bigger than regulation viscosity), mixing time, which is greater than 2 hours rears, can be used, and viscosity is controlled in 12~18s.
3, the wax pattern organized is carried out being coated with operation, first layer is coated with investment precoat, 35~40s of viscosity requirement, and stucco is wanted
80#EC95 molding sand is sought, the handle or sprue cup of mould group are held, is slowly immersed in surface layer slurry, mould group is taken out after 10~15s, is made
Extra slurry instills in slurry bucket, gently blows away blind hole with spray gun, the bubble of narrow slot makes each position of mould group equably cover one
Mould group after repeating above operation, is sent into sand sprinkling machine (manual hanging sand) interior hanging sand, the hanging sand time is about 10 seconds, then by layered material slurry
Mould group is hung over and is spontaneously dried 13~16 hours on mould group frame.The second layer is coated with reinforced layered slurry, and 16~18s of viscosity requirement is spread
Sand requires 80#EC95 molding sand, gently blows the floating sand of investment precoat off with spray gun first, emphasis is to blow the positions such as slot, hole, gap off
Floating sand after immerse in silica solution again, leaching can take out rapidly for silica solution about 2 seconds, control extra silica solution after immerse two layered materials
Slurry operates coplanar layer operation, hangs over mould group after hanging sand 5~7 hours dry on closing rail suspending conveyer.Third layer, which is coated with, to be added
Gu coating, 12~15s of viscosity requirement, stucco require 60#EC95 molding sand, gently blow the floating sand of upper coating off with spray gun, weight
Point is after blowing the floating sand at the positions such as slot, hole, gap off, remaining is the same as the first layer operation.4th layer is coated with reinforced layered slurry, and operation is same
Third layer, stucco require 46#EC95 molding sand.The one week reservation 5mm height in bottom of wax pattern side is paid attention to during being coated with first four layers
Wax pattern not expire brush coating of wax packet being reserved at 5mm wax pattern outside shell by wax pattern bottom after drying by coating, the 4th coating
Casting.Layer 5 reinforced layered slurry is coated after having brushed wax, operates same third layer, stucco requires 46#EC95 molding sand.6th to the 8th
Coating applies reinforced layered slurry, operates same third layer, and stucco requires 24#EC95 molding sand.9th layer of slurry seal, is gently blown off with spray gun
The floating sand of upper coating, emphasis are to hold the handle or sprue cup of mould group, slowly after blowing the floating sand at the positions such as slot, hole, gap off
It immerses in reinforcing layer slurry, mould group is taken out after 10~15s, instill extra slurry in slurry bucket, gently blown away with spray gun blind
Hole, the bubble of narrow slot make each position of mould group equably cover layered material slurry, then hang over mould group on closing rail suspending conveyer
It is 5~7 hours dry.Drying time is greater than 24 hours.
4, the dewaxing of shell
The shell prepared is dewaxed with high pressure dewaxing kettle, pressure is controlled in 0.6~0.7MPa, temperature 165~170
DEG C, the dewaxing time is 15~20 minutes；
5, the roasting of shell
Shell is lain on furnace base plate, maturing temperature: 900 DEG C ± 20 DEG C, time >=2 hour allow to enter lower than 500 DEG C
Furnace, to soaking time after allow blow-on door cool down.
6, Fig. 3 casting under technique thus, makes moderate progress from figure 3, it can be seen that casting glues tin situation, but still has improvement empty
Between.
Embodiment 1
The preparation process of the present embodiment ceramic shell is as follows:
1, investment precoat is prepared, is getting out EC95 (320 mesh) powder, silica solution (830), wetting agent (JFC), defoaming agent (just
Octanol), metal oxide；Configuration proportion is silica solution and EC95 (320 mesh) weight ratio is 1:4, and wetting agent, defoaming agent are silicon
Sol volume 0.12%；Quantitative silica solution is poured into paint can, then is proportionally added into wetting agent and defoaming agent, is started simultaneously
Blender is slowly added to EC95 (320 mesh) while stirring, after mixing time is greater than 2 hours, metal oxide powder is added and continues to stir
It mixes 2 hours, viscosity one is measured in stirring and is poured into L-type blender again to secondary (viscosity should be slightly bigger than regulation viscosity) and continues to stir
Rear can be used within 24 hours.35~40s of viscosity requirement.
2, reinforced layered slurry is prepared, reinforcing layer configuration proportion is silica solution (1430) and EC95 (320 mesh) weight ratio are as follows:
1:1.60, wetting agent, defoaming agent are the 0.12% of silica solution volume；Quantitative silica solution is poured into paint can, is added
Wetting agent and defoaming agent, while starting blender and being slowly added to while stirring EC95 (320 mesh), viscosity one to two is measured in stirring
Secondary (viscosity should be slightly bigger than regulation viscosity), mixing time, which is greater than 2 hours rears, can be used, and viscosity is controlled in 12~18s.
3, the wax pattern organized is carried out being coated with operation, first layer is coated with investment precoat, 35~40s of viscosity requirement, and stucco is wanted
80#EC95 molding sand is sought, the handle or sprue cup of mould group are held, is slowly immersed in surface layer slurry, mould group is taken out after 10~15s, is made
Extra slurry instills in slurry bucket, gently blows away blind hole with spray gun, the bubble of narrow slot makes each position of mould group equably cover one
Mould group after repeating above operation, is sent into sand sprinkling machine (manual hanging sand) interior hanging sand, the hanging sand time is about 10 seconds, then by layered material slurry
Mould group is hung over and is spontaneously dried 13~16 hours on mould group frame.The second layer is coated with reinforced layered slurry, and 16~18s of viscosity requirement is spread
Sand requires 80#EC95 molding sand, gently blows the floating sand of investment precoat off with spray gun first, emphasis is to blow the positions such as slot, hole, gap off
Floating sand after immerse in silica solution again, leaching can take out rapidly for silica solution about 2 seconds, control extra silica solution after immerse two layered materials
Slurry operates coplanar layer operation, hangs over mould group after hanging sand 5~7 hours dry on closing rail suspending conveyer.Third layer, which is coated with, to be added
Gu coating, 12~15s of viscosity requirement, stucco require 60#EC95 molding sand, gently blow the floating sand of upper coating off with spray gun, weight
Point is after blowing the floating sand at the positions such as slot, hole, gap off, remaining is the same as the first layer operation.4th layer is coated with reinforced layered slurry, and operation is same
Third layer, stucco require 46#EC95 molding sand.The one week reservation 5mm wide wax in bottom of wax pattern side is paid attention to during being coated with first four layers
1.0mm paraffin paper is not covered on wax pattern bottom after drying and is not coated at the reserved 5mm wax pattern of coating type by coating, the 4th coating,
The metal layer packet of the position expires casting when with for being poured.Paraffin paper coats layer 5 reinforced layered slurry after having pasted, operate same third
Layer, stucco require 46#EC95 molding sand.6th to the 8th coating applies reinforced layered slurry, operates same third layer, and stucco requires 24#
EC95 molding sand.9th layer of slurry seal, gently blows the floating sand of upper coating off with spray gun, and emphasis blows the positions such as slot, hole, gap off
After floating sand, the handle or sprue cup of mould group are held, is slowly immersed in reinforcing layer slurry, mould group is taken out after 10~15s, it is extra to make
Slurry instills in slurry bucket, gently blows away blind hole with spray gun, the bubble of narrow slot makes each position of mould group equably cover a layered material
Then slurry hangs over mould group 5~7 hours dry on closing rail suspending conveyer.Drying time is greater than 24 hours.
4, the dewaxing of shell
The shell prepared is dewaxed with high pressure dewaxing kettle, pressure is controlled in 0.6~0.7MPa, temperature 165~170
DEG C, the dewaxing time is 15~20 minutes；
5, the roasting of shell
Shell is lain on furnace base plate, maturing temperature: 900 DEG C ± 20 DEG C, time >=2 hour allow to enter lower than 500 DEG C
Furnace, to soaking time after allow blow-on door cool down.
6, casting under process modification, viscous tin situation have larger improvement, cast(ing) surface compared with comparative example 1 and comparative example 2 to Fig. 4 thus
It is hardly visible viscous tin.In summary example finds that 1 technique of embodiment has larger improvement to casting scab, almost without obvious
Viscous tin situation occurs.
Fig. 5 is that certain model directional vane testpieces is compared through surface quality of continuous castings before and after 3 process modification of embodiment, discovery warp
1 technique of embodiment should into rear cast(ing) surface glue tin be improved significantly.
Claims (7)
1. a kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal, it is characterised in that: this method packet
Include following steps:
(1) surface layer slurry preparation:
Surface layer slurry composition is EC95, metal oxide, silica solution 830, wetting agent and defoaming agent；Each component ratio are as follows: silicon is molten
The weight ratio of glue and EC95 are 1:(3.5~4.25), the volume of wetting agent is the 0.1~0.15% of silica solution volume, defoaming
The volume of agent is the 0.1~0.15% of silica solution volume, and the weight of metal oxide accounts for the 2~5% of silica solution weight；
(2) reinforcing layer slurry preparation:
Reinforcing layer slurry group becomes silica solution 1430, wetting agent, defoaming agent and EC95；Each component ratio are as follows: silica solution and EC95
Weight ratio be 1:(1.5~1.75), the volume of wetting agent is the 0.1%~0.15% of silica solution volume, the body of defoaming agent
Product is the 0.1%~0.15% of silica solution volume；
(3) sanding material selects EC95 sand；
(4) shell is coated with operation:
Wax pattern first layer is coated with surface layer slurry, and the wax pattern second layer is coated with surface layer slurry or reinforcing layer slurry；Wax pattern third layer and
Reinforcing layer slurry is all coated with after three layers；Wherein: retaining 5mm height not in the lower part of wax pattern lateral surface during being coated with first four layers
It is coated with coating；The paraffin paper of 0.5~1mm thickness is covered on to the position for not being coated with coating after the 4th coating is dry, then in wax
Several layers of reinforced layered slurries below are coated on the entire outer surface of type again；
(5) dewaxing of shell:
The shell prepared is dewaxed with high pressure dewaxing kettle, pressure control be 0.6~0.7MPa, 165~170 DEG C of temperature,
The dewaxing time is 15~20 minutes；
(6) roasting of shell:
Shell after dewaxing lies on furnace base plate and is roasted, and 880-920 DEG C of maturing temperature, calcining time >=2 hour；Roasting
The cooling directional solidification ceramic shell of the anti-sticking tin liquid metal is obtained after burning.
2. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 1, special
Sign is: in step (1), surface layer slurry process for preparation are as follows: quantitative silica solution is poured into paint can, then is successively added in proportion
Enter wetting agent and defoaming agent, then starts to stir and be slowly added under agitation EC95, after stirring 2 hours, addition metal
Oxide continue stirring 2 hours, measure viscosity 1-2 times in whipping process, then pour into L-type blender continue stir 24 hours after
It can use, viscosity is controlled in 35~40s.
3. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 2, special
Sign is: in step (1), mixed powder that the metal oxide is made of tungsten oxide, chromium oxide and molybdenum oxide.
4. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 1, special
Sign is: in step (2), reinforcing layer slurry preparation process are as follows: quantitative silica solution is poured into paint can, wetting agent is added
And defoaming agent, it then starts blender and is slowly added to EC95 while stirring, measured viscosity 1-2 times in stirring, stirring makes after 2 hours
With viscosity is controlled in 12~18s.
5. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 1, special
Sign is: in step (1) neutralization procedure (2), the wetting agent is JFC, and defoaming agent is n-octyl alcohol.
6. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 1, special
Sign is: in step (3), the granularity of the EC95 sand is 80#, 60#, 46# or 24#.
7. the preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal according to claim 1, special
Sign is: in step (6) roasting process, enter furnace lower than 500 DEG C, to soaking time after blow-on door cool down.
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| CN109894579A (en) * | 2017-12-08 | 2019-06-18 | 汪风珍 | A kind of " lost-wax process " metal/alloy casting technique |
| CN108127082A (en) * | 2017-12-22 | 2018-06-08 | 株洲九方铸造有限责任公司 | A kind of shell anti-deformation process |
| CN108723297B (en) * | 2018-05-29 | 2020-06-16 | 中国科学院金属研究所 | Preparation method of ceramic shell for large-size complex-structure directionally solidified alloy |
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| CN110465625B (en) * | 2019-09-11 | 2021-01-12 | 中国科学院金属研究所 | Preparation method of ceramic shell for improving physical sand adhesion of high-temperature alloy directional solidification casting |
| TWI718785B (en) * | 2019-11-28 | 2021-02-11 | 財團法人金屬工業研究發展中心 | Method for manufacturing a mold |
| US11267044B2 (en) | 2019-12-23 | 2022-03-08 | Metal Industries Research & Development Centre | Method for manufacturing a shell mold |
| CN111545711B (en) * | 2020-05-19 | 2022-04-05 | 中国科学院金属研究所 | Preparation method of thermal shock resistant ceramic shell for high-temperature alloy LMC (melt-solidified metallic) directional solidification |
| CN114178486B (en) * | 2021-12-14 | 2024-04-09 | 贵阳航发精密铸造有限公司 | Shell for improving sand sticking on surface of high-temperature alloy after casting and preparation method thereof |
| CN115971819A (en) * | 2022-11-21 | 2023-04-18 | 苏州东岱电子科技有限公司 | Laser steel mesh processing technology for improving poor continuous tin |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537484A (en) * | 2009-03-17 | 2009-09-23 | 江苏大学 | Method for improving temperature distribution in process of single crystal casting solidification |
| CN102847875A (en) * | 2012-07-09 | 2013-01-02 | 沈阳黎明航空发动机(集团)有限责任公司 | Shell making process method for vane directional solidification and alloy sand-burning prevention |
| CN103143678A (en) * | 2013-04-01 | 2013-06-12 | 东方电气集团东方汽轮机有限公司 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
| CN103934410A (en) * | 2014-04-16 | 2014-07-23 | 青岛润乾钛业科技有限公司 | Preparation method of oxide surface layer shell for titanium alloy precision casting |
| CN104550731A (en) * | 2014-12-06 | 2015-04-29 | 沈阳工业大学 | Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade |
| CN105642831A (en) * | 2016-01-27 | 2016-06-08 | 北京工业大学 | Mold shell for precision casting or directional solidification of TiAl-based alloy and method for manufacturing mold shell |
-
2016
- 2016-12-22 CN CN201611197524.XA patent/CN106734852B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537484A (en) * | 2009-03-17 | 2009-09-23 | 江苏大学 | Method for improving temperature distribution in process of single crystal casting solidification |
| CN102847875A (en) * | 2012-07-09 | 2013-01-02 | 沈阳黎明航空发动机(集团)有限责任公司 | Shell making process method for vane directional solidification and alloy sand-burning prevention |
| CN103143678A (en) * | 2013-04-01 | 2013-06-12 | 东方电气集团东方汽轮机有限公司 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
| CN103934410A (en) * | 2014-04-16 | 2014-07-23 | 青岛润乾钛业科技有限公司 | Preparation method of oxide surface layer shell for titanium alloy precision casting |
| CN104550731A (en) * | 2014-12-06 | 2015-04-29 | 沈阳工业大学 | Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade |
| CN105642831A (en) * | 2016-01-27 | 2016-06-08 | 北京工业大学 | Mold shell for precision casting or directional solidification of TiAl-based alloy and method for manufacturing mold shell |
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