CN106311980A - Preparing method for ceramic molding shell for casting high-temperature alloy orientation/single crystal blade - Google Patents
Preparing method for ceramic molding shell for casting high-temperature alloy orientation/single crystal blade Download PDFInfo
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- CN106311980A CN106311980A CN201510397608.7A CN201510397608A CN106311980A CN 106311980 A CN106311980 A CN 106311980A CN 201510397608 A CN201510397608 A CN 201510397608A CN 106311980 A CN106311980 A CN 106311980A
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- shell
- ludox
- single crystal
- wetting agent
- temperature alloy
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- 239000000919 ceramic Substances 0.000 title claims abstract description 49
- 239000000956 alloy Substances 0.000 title claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005266 casting Methods 0.000 title claims abstract description 19
- 239000013078 crystal Substances 0.000 title claims abstract description 19
- 238000000465 moulding Methods 0.000 title abstract 7
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 89
- 239000002002 slurry Substances 0.000 claims description 31
- 238000002360 preparation method Methods 0.000 claims description 30
- 239000000080 wetting agent Substances 0.000 claims description 30
- 239000013530 defoamer Substances 0.000 claims description 28
- 239000010410 layer Substances 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 19
- 229910052593 corundum Inorganic materials 0.000 claims description 16
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical group CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 239000002344 surface layer Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 238000013019 agitation Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 3
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 2
- 239000003906 humectant Substances 0.000 claims description 2
- 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 2
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 150000002927 oxygen compounds Chemical class 0.000 claims 1
- -1 yittrium oxide Chemical compound 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 33
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 239000011651 chromium Substances 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 239000011257 shell material Substances 0.000 description 45
- 238000007667 floating Methods 0.000 description 16
- 239000007921 spray Substances 0.000 description 13
- 206010039509 Scab Diseases 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005495 investment casting Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical group O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a preparing method for a ceramic molding shell for casting a high-temperature alloy orientation/single crystal blade and belongs to the technical field of the high-temperature alloy precision investment pattern casting technology. According to the method, a certain amount of a metal oxide mixture is absorbed from a coating of a face layer of the ceramic molding shell in advance, low-valence oxide in the ceramic molding shell can be prevented from reacting with chromium in a fused alloy, and therefore chromium in the fused alloy can be prevented from being transferred into the ceramic molding shell, the chromium transferred into the ceramic molding shell is reduced, the chemical sand burning tendency is eliminated, and the quality of the surface of a casting is improved. The prepared ceramic molding shell is good in chemical stability, high in surface density, capable of ensuring the surface quality and the size precision of a blade blank and capable of meeting the requirement for advanced orientation/single crystal blade production.
Description
Technical field
The present invention relates to high temperature alloy investment precision casting technology technical field, be specifically related to a kind of high temperature alloy fixed
To the preparation method of/single crystal blade casting ceramic shell.
Background technology
High temperature alloy is mainly used in manufacture, and turbo blade and nozzle etc. are complex-shaped, precision is high and surface roughness
Low part, therefore high temperature alloy many employings precision-investment casting forming technology.The production work of precision-investment casting
Skill process is fusible pattern manufacture, shell, alloy remelting, cast and casting cleaning and repairing.Wherein shell material with
Manufacturing process directly affects dimensional accuracy and the surface roughness of foundry goods.
During directional solidification precision casting, shell is casting of molten metal at high operating temperatures, and shell is as one
" container " is filled with motlten metal, it and the interface interaction existing thermomechanical osmosis of metal, has again hot thing
Physicochemical effect.During directional solidification, alloy keep in shell liquid for up to dozens of minutes to several
Hour, each component of type shell material is easy to and liquid alloy generation chemical reaction.Therefore shell moulds in directional solidification surface
Layer refractory material not only wants softening point high, and impurity content is low, and the chemical stability of material itself to be got well, with
Prevent shell surface and molten alloy generation chemical reaction.Shell/metal interface behavior in foundry goods and outward appearance
Quality has a major impact.
The composition of high-temperature alloy blades is extremely complex, in order to put forward heavy alloyed mobility, and the cast temperature of usual foundry goods
Degree is more than 1400 DEG C, and have even to reach 1600 DEG C.At such high temperatures, ceramic shell is main
Composition silicon dioxide or aluminium oxide all can react with the carbon in high temperature alloy, generation oxide at a low price, and at a low price
Oxide can aoxidize again the chromium in high temperature alloy, so that blade surface forms chemical scab, but due to anti-
Stopping the reasons such as foundry goods recrystallization, cast surface chemistry scab cannot use mechanical means to remove, and therefore, prepares one
Planting Sand sticking-resistant high temperature alloy orientation/single crystal blade casting ceramic shell is problem anxious to be resolved in production.
Summary of the invention
It is an object of the invention to provide the preparation of a kind of high temperature alloy orientation/single crystal blade casting ceramic shell
Method, prepared ceramic shell chemical stability is good, and surface compact degree is high, it is ensured that foundry goods (blade blank)
Surface quality and dimensional accuracy, and essentially eliminate high temperature alloy molten metal bath and shell inner surface at high temperature
In the case of chemical reaction, there is good Sand sticking-resistant performance, it is possible to meet advanced oriented/single crystal blade produce
Needs.
For achieving the above object, the technical solution used in the present invention is as follows:
The preparation method of a kind of high temperature alloy orientation/single crystal blade casting ceramic shell, the method includes as follows
Step:
(1) surface layer slurry preparation:
With Al2O3Ceramics, Ludox, wetting agent, defoamer and oxidate powder are raw material, are fallen by Ludox
Enter in paint can, after adding wetting agent and defoamer, be slowly added to Al under agitation2O3Ceramics, stirs
After mixing 2 hours, add oxidate powder and continue stirring 2 hours, then continue to stir in pouring L-type mould wash mixer into
After mixing 24 hours standby；Capstock slurry viscosity controls 20～35s；
(2) back-up coat slurry preparation:
Ludox is poured in paint can, add wetting agent and defoamer, be slowly added under agitation
Al2O3Ceramics, mixing time stops after being more than 2 hours, prepares back-up coat slip standby；Back-up coat slip
Viscosity controls 5～15s；
(3) shell be coated with operation:
First being coated with 1～2 aspect layered material slurries on wax-pattern, viscosity controls 20～35s, and stucco is emergy,
Natural drying 3～obtain described shell surface layer after 16 hours；Then in shell surface layer, it is coated with back-up coat slip,
Viscosity controls 5～15s, and stucco is emergy, natural drying 3～after 10 hours on surface layer obtain shell add
Gu layer；
(4) dewaxing of shell:
Shell high pressure dewaxing kettle step (3) obtained dewaxes, Stress control 0.6～0.7MPa,
Temperature 165～170 DEG C, the dewaxing time is 15～20 minutes；
(5) roasting of shell:
Shell after step (4) being dewaxed lies in and carries out roasting, sintering temperature on furnace base plate
500～1000 DEG C, roasting time >=2 hour, i.e. obtain described high temperature alloy orientation/single crystal blade casting pottery
Shell.
In above-mentioned steps (1), described Ludox is the colloidal sol of silicon dioxide, micro-by amorphous silica
Little granule is dispersed in water the stable colloidal solutions of formation, selects 830 Ludox in this step, its chemical composition
Middle SiO2Content 29-31%, Na2O≤0.5%；Described wetting agent is JFC wetting agent；Defoamer is n-octyl alcohol；
Oxidate powder is molybdenum oxide (MoO3), yittrium oxide (Y2O3), chromium oxide (Cr2O3) and tungsten oxide (WO3
And WO2One or more in).
In step (1), described Ludox and Al2O3Ceramics part by weight is 1:(2.0～5.5), described profit
The consumption of humectant and defoamer is the 0.1～0.15% of Ludox volume, and described oxidate powder accounts for investment precoat system
The 4～15% of standby raw material gross weight.
In above-mentioned steps (2), described Ludox is 1430 Ludox, and wetting agent is JFC wetting agent, disappears
Infusion is n-octyl alcohol.
In above-mentioned steps (2), described Ludox and Al2O3The part by weight of ceramics is: 1:(1.0～1.8),
The consumption of described wetting agent and defoamer is the 0.1～0.15% of Ludox volume.
In above-mentioned steps (5) roasting process, it is allowed to enter stove less than 500 DEG C, after temperature retention time, allow blow-on
Door cooling.
Design principle of the present invention and having the beneficial effect that:
1, the present invention is by a certain amount of metal oxide mixture of investment precoat pre-absorption at ceramic shell,
The low oxide being possible to prevent in ceramic shell reacts with the chromium in molten alloy, thus reduces and prevent from melting
Chromium in alloy proceeds in ceramic shell, eliminates chemical scab tendency, improves the quality of cast(ing) surface.
2, to prepare ceramic shell chemical stability good for the present invention, and surface compact degree is high, it is ensured that blade blank
Surface quality and dimensional accuracy, it is possible to meet advanced oriented/single crystal blade produce needs.
Accompanying drawing explanation
Fig. 1 is the foundry goods sprue of comparative example 1 preparation.
Fig. 2 is the foundry goods sprue of comparative example 2 preparation.
Fig. 3 is the foundry goods sprue of embodiment 1 preparation.
Fig. 4 is surface quality of continuous castings contrast after directional vane example 1 by contrast and embodiment 1 PROCESS FOR TREATMENT；Wherein:
(a) comparative example 1；(b) embodiment 1.
Detailed description of the invention
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
Comparative example 1
1, preparation investment precoat:
Get out Al2O3Ceramics, Ludox (830), wetting agent (JFC), defoamer (n-octyl alcohol)；
Configuration proportion: Ludox and Al2O3Ceramics weight ratio is 1:2.0～5.5, and wetting agent, defoamer are silicon
Sol volume 0.1～0.15%, this example is added without oxidate powder；Process for preparation: pour quantitative Ludox into painting
In charging basket, then it is proportionally added into wetting agent and defoamer, starts blender simultaneously and be slowly added to Al while stirring2O3
Ceramics, mixing time is more than 2 hours, and (it is viscous that viscosity should be slightly bigger than regulation to measure viscosity one to secondary in stirring
Degree) pour into again after the interior continuation of L-type blender is stirred 24 hours and can use；Investment precoat viscosity requirement
20～35s.
2, preparation reinforced layered slurry:
Configuration proportion: Ludox (1430) and Al2O3Ceramics ratio is: 1:1.0～1.8, wetting agent,
Defoamer is the 0.1～0.15% of Ludox volume；Process for preparation: quantitative Ludox is poured in paint can,
Add wetting agent and defoamer, start blender simultaneously and be slowly added to Al while stirring2O3Ceramics, stirring
Middle measurement viscosity one to secondary (viscosity should be slightly bigger than regulation viscosity), mixing time can make after being more than 2 hours
With；Body & mind battle line disunity viscosity controls 5～15s.
3, shell is coated with operation:
First being coated with investment precoat, viscosity requirement 20～35s on wax-pattern, stucco requires 80# emergy, holds
The handle of module or cup, slowly immerse in surface layer slip, takes out module, make unnecessary material after 10～15s
Slurry instills in slip bucket, blows away blind hole, the bubble of narrow slot with spray gun gently, makes each position of module cover equably
One layered material slurry, after repeating above operation, sends module into sand sprinkling machine (manual hanging sand) interior hanging sand, hanging sand time
It is about 10 seconds, then module is hung on module frame natural drying 3～16 hours.
The second layer is coated with reinforced layered slurry: viscosity requirement 5～15s, stucco requires 60# emergy, first with spray
Rifle blows the floating sand of investment precoat gently off, it is important that immerse silicon again after blowing the floating sand at the positions such as groove, hole, gap off
In colloidal sol, leaching Ludox within about 2 seconds, can take out rapidly, control unnecessary Ludox after immerse two layered materials slurry, behaviour
Make coplanar layer operation, after hanging sand, module is hung over and be dried 3～10 hours on closed orbit overhead chain conveyer.
Third layer is coated with reinforced layered slurry: viscosity requirement 5～15s, stucco requires 46# emergy, light with spray gun
The floating sand of upper coating is fallen in featheriness, it is important that after blowing the floating sand at the positions such as groove, hole, gap off, remaining is with first
Layer operation.
4th layer is coated with reinforced layered slurry to layer 6: operating same third layer, stucco requires 24# emergy.
Layer 7 slurry seal, then hangs over module and is dried 3～10 hours on closed orbit overhead chain conveyer.
4, the dewaxing of shell:
The shell high pressure dewaxing kettle prepared is dewaxed, Stress control 0.6～0.7MPa, temperature
165～170 DEG C, the dewaxing time is 15～20 minutes；
5, the roasting of shell:
Shell lies on furnace base plate, sintering temperature: 500～1000 DEG C, time >=2 hour, it is allowed to be less than
500 DEG C enter stove, allow the cooling of blow-on door after temperature retention time.
Fig. 1 is the foundry goods sprue using this example technique to prepare, from figure 1 it appears that foundry goods running channel scab
Situation is more serious, has and bigger improves space.
Comparative example 2
1, preparation investment precoat:
Get out Al2O3Ceramics, Ludox (830), wetting agent (JFC), defoamer (n-octyl alcohol),
Oxide mixture powder (molybdenum oxide and yittrium oxide)；Configuration proportion: Ludox and Al2O3Ceramics weight ratio
For 1:2.0～5.5, wetting agent, defoamer are Ludox volume 0.1～0.15%, and oxidate powder accounts for surface layer and is coated with
The 2% of material gross mass；Process for preparation: quantitative Ludox is poured in paint can, then is proportionally added into moistening
Agent and defoamer, start blender simultaneously and be slowly added to Al while stirring2O3Ceramics, mixing time is more than 2
After hour, add oxide mixture powder and continue stirring 2 hours, stirring is measured viscosity one to secondary (viscosity
Should be slightly bigger than regulation viscosity) pour into again after the interior continuation of L-type blender is stirred 24 hours and can use；Surface layer is coated with
Material viscosity requirement 20～35s.
2, preparation reinforced layered slurry:
Configuration proportion: Ludox (1430) and Al2O3Ceramics ratio is about: 1:1.0～1.8, wetting agent,
Defoamer is the 0.1%～0.15% of Ludox volume；Process for preparation: pour quantitative Ludox into paint can
In, add wetting agent and defoamer, start blender simultaneously and be slowly added to Al while stirring2O3Ceramics,
Measuring viscosity one to secondary (viscosity should be slightly bigger than regulation viscosity) in stirring, mixing time is more than 2 hours rears
Can use；Viscosity controls 5～15s.
3, shell is coated with operation:
Ground floor is coated with investment precoat: viscosity requirement 20～35s, stucco requires 80# emergy, holds module
Handle or cup, slowly immerse in surface layer slip, take out module after 10～15s, make unnecessary slip drip
Enter in slip bucket, blow away blind hole, the bubble of narrow slot with spray gun gently, make each position of module cover one layer equably
Slip, after repeating above operation, sends module into sand sprinkling machine (manual hanging sand) interior hanging sand, and the hanging sand time is about
10 seconds, then module is hung on module frame natural drying 3～16 hours.
The second layer is coated with reinforced layered slurry: viscosity requirement 5～15s, stucco requires 60# emergy, first with spray
Rifle blows the floating sand of investment precoat gently off, it is important that immerse silicon again after blowing the floating sand at the positions such as groove, hole, gap off
In colloidal sol, leaching Ludox within about 2 seconds, can take out rapidly, control unnecessary Ludox after immerse two layered materials slurry, behaviour
Make coplanar layer operation, after hanging sand, module is hung over and be dried 3～10 hours on closed orbit overhead chain conveyer.
Third layer is coated with reinforced layered slurry: viscosity requirement 5～15s, stucco requires 46# emergy, light with spray gun
The floating sand of upper coating is fallen in featheriness, it is important that after blowing the floating sand at the positions such as groove, hole, gap off, remaining is with first
Layer operation.
4th layer is coated with reinforced layered slurry to layer 6: operating same third layer, stucco requires 24# emergy.
Layer 7 slurry seal, blows the floating sand of upper coating gently off with spray gun, it is important that blow groove, hole, gap etc. off
After the floating sand at position, hold handle or the cup of module, slowly immerse in back-up coat slip, after 10～15s
Take out module, make unnecessary slip instill in slip bucket, blow away blind hole, the bubble of narrow slot with spray gun gently, make
The each position of module covers a layered material slurry equably, is then hung over by module and is dried on closed orbit overhead chain conveyer
3～10 hours.
4, the dewaxing of shell:
The shell high pressure dewaxing kettle prepared is dewaxed, Stress control 0.6～0.7MPa, temperature
165～170 DEG C, the dewaxing time is 15～20 minutes；
5, the roasting of shell:
Shell lies on furnace base plate, sintering temperature: 900 DEG C ± 20 DEG C, time >=2 hour, it is allowed to be less than
500 DEG C enter stove, allow the cooling of blow-on door after temperature retention time.
Fig. 2 is the foundry goods sprue under this example PROCESS FOR TREATMENT, as can be seen from Figure 2 foundry goods running channel scab situation
Relatively comparative example 1 has certain improvement, but still suffers from improving space.
Embodiment 1
1, preparation investment precoat:
Get out Al2O3Ceramics, Ludox (830), wetting agent (JFC), defoamer (n-octyl alcohol),
Oxide mixture powder (molybdenum oxide and yittrium oxide)；Configuration proportion: Ludox and Al2O3Ceramics weight ratio
For 1:2.0～5.5, wetting agent, defoamer are Ludox volume 0.1～0.15%, and oxide accounts for investment precoat
The 10% of gross mass；Process for preparation: quantitative Ludox is poured in paint can, then is proportionally added into wetting agent
And defoamer, start blender simultaneously and be slowly added to Al while stirring2O3Ceramics, mixing time is little more than 2
Shi Hou, adds oxidate powder and continues stirring 2 hours, and (viscosity should be slightly bigger than to measure viscosity one to secondary in stirring
Regulation viscosity) pour into again after the interior continuation of L-type blender is stirred 24 hours and can use.Investment precoat viscosity is wanted
Ask 20～35s.
2, preparation reinforced layered slurry:
Back-up coat configuration proportion: Ludox (1430) and Al2O3Ceramics ratio is about: 1:1.0～1.8,
Wetting agent, defoamer are the 0.1%～0.15% of Ludox volume；Process for preparation: quantitative Ludox is fallen
Enter in paint can, add wetting agent and defoamer, start blender simultaneously and be slowly added to Al while stirring2O3
Ceramics, measures viscosity one to secondary (viscosity should be slightly bigger than regulation viscosity) in stirring, mixing time is more than 2
Can use after hour；Reinforced layered slurry viscosity controls 5～15s.
3, shell is coated with operation:
Ground floor is coated with investment precoat, viscosity requirement 20～35s, and stucco requires 80# emergy, holds module
Handle or cup, slowly immerse in surface layer slip, take out module after 10～15s, make unnecessary slip drip
Enter in slip bucket, blow away blind hole, the bubble of narrow slot with spray gun gently, make each position of module cover one layer equably
Slip, after repeating above operation, sends module into sand sprinkling machine (manual hanging sand) interior hanging sand, and the hanging sand time is about
10 seconds, then module is hung on module frame natural drying 3～16 hours.
The second layer is coated with reinforced layered slurry, viscosity requirement 5～15s, and stucco requires 60# emergy, first with spray
Rifle blows the floating sand of investment precoat gently off, it is important that immerse silicon again after blowing the floating sand at the positions such as groove, hole, gap off
In colloidal sol, leaching Ludox within about 2 seconds, can take out rapidly, control unnecessary Ludox after immerse two layered materials slurry, behaviour
Make coplanar layer operation, after hanging sand, module is hung over and be dried 3～10 hours on closed orbit overhead chain conveyer.
Third layer is coated with reinforced layered slurry, viscosity requirement 5～15s, and stucco requires 46# emergy, light with spray gun
The floating sand of upper coating is fallen in featheriness, it is important that after blowing the floating sand at the positions such as groove, hole, gap off, remaining is with first
Layer operation.
4th layer is coated with reinforced layered slurry to layer 6, operates same third layer, and stucco requires 24# emergy.
Layer 7 slurry seal, blows the floating sand of upper coating gently off with spray gun, it is important that blow groove, hole, gap etc. off
After the floating sand at position, hold handle or the cup of module, slowly immerse in back-up coat slip, after 10～15s
Take out module, make unnecessary slip instill in slip bucket, blow away blind hole, the bubble of narrow slot with spray gun gently, make
The each position of module covers a layered material slurry equably, is then hung over by module and is dried on closed orbit overhead chain conveyer
3～10 hours.
4, the dewaxing of shell:
The shell high pressure dewaxing kettle prepared is dewaxed, Stress control 0.6～0.7MPa, temperature
165～170 DEG C, the dewaxing time is 15～20 minutes；
5, the roasting of shell:
Shell lies on furnace base plate, sintering temperature: 900 DEG C ± 20 DEG C, time >=2 hour, it is allowed to be less than
500 DEG C enter stove, allow the cooling of blow-on door after temperature retention time.
Fig. 3 is foundry goods sprue under the present embodiment process modification, and scab situation relatively comparative example 1, comparative example 2 have
Bigger improvement, foundry goods running channel surface is hardly visible obvious scab.
Fig. 4 is surface quality of continuous castings contrast after directional vane example 1 by contrast and embodiment 1 PROCESS FOR TREATMENT, finds
After through embodiment 1 technique, this enters scab be improved significantly.
Embodiment 2
Difference from Example 1 is, during preparation investment precoat, the oxidate powder of employing is chromium oxide and oxygen
Change tungsten (WO3) mixed oxide, through the present embodiment process after foundry goods running channel surface and single crystal blade surface
Be hardly visible obvious scab, surface appearance be improved significantly.
Claims (6)
1. the preparation method of a high temperature alloy orientation/single crystal blade casting ceramic shell, it is characterised in that:
The method comprises the steps:
(1) surface layer slurry preparation:
With Al2O3Ceramics, Ludox, wetting agent, defoamer and oxidate powder are raw material, are fallen by Ludox
Enter in paint can, after adding wetting agent and defoamer, add Al under agitation2O3Ceramics, stirs 2
After hour, add oxidate powder and continue stirring 2 hours, then pour continuation stirring 24 in L-type mould wash mixer into
After hour standby；Capstock slurry viscosity controls 20～35s；
(2) back-up coat slurry preparation:
Ludox is poured in paint can, add wetting agent and defoamer, add Al under agitation2O3
Ceramics, mixing time stops after being more than 2 hours, prepares back-up coat slip standby；Back-up coat phosphoric acid control
System is 5～15s；
(3) shell be coated with operation:
First being coated with 1～2 aspect layered material slurries on wax-pattern, viscosity controls 20～35s, and stucco is emergy,
Natural drying 3～obtain described shell surface layer after 16 hours；Then in shell surface layer, it is coated with back-up coat slip,
Viscosity controls 5～15s, and stucco is emergy, natural drying 3～after 10 hours on surface layer obtain shell add
Gu layer；
(4) dewaxing of shell:
Shell high pressure dewaxing kettle step (3) obtained dewaxes, Stress control 0.6～0.7MPa,
Temperature 165～170 DEG C, the dewaxing time is 15～20 minutes；
(5) roasting of shell:
Shell after step (4) being dewaxed lies in and carries out roasting, sintering temperature on furnace base plate
500～1000 DEG C, roasting time >=2 hour, i.e. obtain described high temperature alloy orientation/single crystal blade casting pottery
Shell.
The preparation side of high temperature alloy orientation/single crystal blade casting ceramic shell the most according to claim 1
Method, it is characterised in that: in step (1), described Ludox is 830 Ludox, SiO in its chemical composition2
Content 29-31%, Na2O≤0.5%；Described wetting agent is JFC wetting agent；Defoamer is n-octyl alcohol；Oxidation
Thing powder is one or more in molybdenum oxide, yittrium oxide, chromium oxide and tungsten oxide.
The system of high temperature alloy orientation/single crystal blade casting ceramic shell the most according to claim 1 and 2
Preparation Method, it is characterised in that: in step (1), described Ludox and Al2O3Ceramics part by weight is 1:
(2.0～5.5), the consumption of described wetting agent and defoamer is the 0.1～0.15% of Ludox volume, described oxygen
Compound powder accounts for investment precoat and prepares the 4～15% of raw material gross weight.
The preparation side of high temperature alloy orientation/single crystal blade casting ceramic shell the most according to claim 1
Method, it is characterised in that: in step (2), described Ludox is 1430 Ludox, and wetting agent is JFC profit
Humectant, defoamer is n-octyl alcohol.
5. according to the system of the high temperature alloy orientation/single crystal blade casting ceramic shell described in claim 1 or 4
Preparation Method, it is characterised in that: in step (2), described Ludox and Al2O3The part by weight of ceramics is:
1:(1.0～1.8), the consumption of described wetting agent and defoamer is the 0.1～0.15% of Ludox volume.
The preparation side of high temperature alloy orientation/single crystal blade casting ceramic shell the most according to claim 1
Method, it is characterised in that: in step (5) roasting process, it is allowed to enter stove less than 500 DEG C, after temperature retention time
Allow the cooling of blow-on door.
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