CN104399885A - Method for increasing permeability of investment cast ceramic shell - Google Patents
Method for increasing permeability of investment cast ceramic shell Download PDFInfo
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- CN104399885A CN104399885A CN201410591737.5A CN201410591737A CN104399885A CN 104399885 A CN104399885 A CN 104399885A CN 201410591737 A CN201410591737 A CN 201410591737A CN 104399885 A CN104399885 A CN 104399885A
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- shell
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- ceramic shell
- carbon fiber
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Classifications
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- 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
- 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
-
- 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
Abstract
The invention provides a method for increasing the permeability of an investment cast ceramic shell, and belongs to the field of investment casting. The problem of easy formation of defects of the surface of a cast member in the cast member casting process in the prior art is solved. The method comprises the following steps: adding an adhesive, strengthening layer all-layer powder and carbon-containing fibers into a stirring barrel, adding an antifoaming agent and a wetting agent, and adjusting the viscosity of the obtained coating to a required range by using deionized water to obtain a strengthening layer coating with all layers having the carbon-containing fibers; coating a wax mold with the surface layer coating of the shell according to a routine shell making technology, completing a coating, sanding and drying process by using the all-layer strengthening layer coating, coating a sealing slurry layer without the carbon-containing fibers, and drying to obtain a shell; and dewaxing the shell, and roasting to obtain the net structured ceramic shell with exhaust channels. The method guarantees the strength of the shell, improves the permeability of the shell, eliminates the defects caused by unsmooth exhaust of the surface of the cast member, guarantees the quality of the surface of the cast member, and improves the qualified rate of the cast member.
Description
Technical field
The invention belongs to model casting field, relate generally to a kind of method increasing model casting ceramic shell gas permeability.
Background technology
Increasing complex structural member and wall thickness need to use forging type shaping less than the thin-walled parts of 1mm, shell is made up of powder and sand material compact siro spinning technology, almost there is no space, if when pouring into a mould, shell makes moist, or in alloy, gas content is too high, and the gas in shell cannot be discharged, the defect such as pore or cold shut will be formed at cast(ing) surface, cause foundry goods to scrap.
Therefore, it may be necessary technological improvement and solve the problem that in casting process, gas cannot be discharged from shell.
Summary of the invention
The object of the invention is, in order to solve above-mentioned the problems of the prior art, to provide a kind of method increasing model casting ceramic shell gas permeability.The method is by adding the carbon fiber-containings such as terylene in making shell process in coating, fiber is eliminated by roasting after shell processed, obtain the network structure ceramic shell with exhaust passage, both the intensity of shell can have been ensured, the gas permeability of shell can be improved again, thus ensure that the gas of foundry goods in casting process in alloy or shell can be discharged, eliminate cast(ing) surface owing to being vented the defect freely do not caused, ensure the surface quality of foundry goods, improve the qualification rate of foundry goods.
For achieving the above object, technical scheme of the present invention is as follows:
Increase a method for model casting ceramic shell gas permeability, concrete operation step is as follows:
(1) the carbon fiber-containing coating of shell is prepared
To the ground floor of the second layer of shell and back-up coat powder and add carbon fiber-containing in each back-up coat powder subsequently, last slurry seal layer powder does not add carbon fiber-containing; Agitator is added by binding agent, each layer powder of back-up coat and carbon fiber-containing, mixing speed 400-500r/min, stir 24 ~ 30 hours, add defoamer and wetting agent again, and by deionized water, said mixture viscosity is adjusted to scope needed for each coating of back-up coat, namely obtain the reinforced layered slurry that each layer adds carbon fiber-containing;
Wherein, described carbon fiber-containing is terylene, aramid fiber etc., and addition is the 0.5-3wt% of each layer powder quality of back-up coat, and specification is diameter
length 2-5mm;
Described back-up coat powder is the refractory materials such as electrofused mullite powder, electro-corundum powder or bauxite, preferred 320# electrofused mullite powder and 320# electro-corundum powder; Described binding agent is Ludox, silester etc., preferred GRJ26 type Ludox; Defoamer is n-butanol etc.; Wetting agent is stearic acid etc.;
The mass ratio of described back-up coat each layer powder and each layer binder is 3.5 ~ 4.5:1; Described defoamer addition is 0.5% ~ 1.0wt% of each layer binder quality; Described wetting agent addition is 0.5% ~ 1.0wt% of binding agent quality;
(2) shell is prepared
Conveniently process for making shell coats the ground floor of shell and the coating of superficial layer on wax-pattern, and this coating does not add carbon fiber-containing, and after stucco drying; Use the obtained each layer reinforced layered slurry of step (1) to complete again and hang painting, stucco, dry process, finally coat the slurry seal coating drying that do not add carbon fiber-containing again, obtain shell; Shell is through dewaxing, and roasting in a conventional manner in the roaster such as electric furnace or gas furnace, and after carbon fiber-containing is burnt by insulation for 2-3 hour 700 DEG C-800 DEG C time, then continue to be warming up to and burn temperature eventually, obtains the network structure ceramic shell with exhaust passage.
The present invention compared with prior art, it is advantageous that:
1, in the coating of shell processed, add carbon fiber-containing, object forms exhaust passage in shell.Namely after roasting, carbon fiber-containing decomposes, form reticulated cell gap structure, for the discharge of gas a small amount of in shell during cast provides passage, avoiding cast(ing) surface due to gas discharges the defect such as pore, pit freely do not caused, ensure that the surface quality of foundry goods, improve the casting qualification rate of foundry goods.
2, the carbon fiber-containing diameter added is
length is 2-5mm, and fiber is more tiny, is easily evenly mixed in coating, and fiber can not be deposited in the bottom being coated with slip, and mixed process is simple; And after high-temperature roasting, gap structure is fine and closely woven in shell, not only can improves the gas permeability of shell but also the intensity of shell can be ensured.
3, this method does not add carbon fiber-containing in the ground floor and superficial layer coating of shell, shell space can be made to become large, reduce shell surface smoothness, and make foundry goods scab, cause more defects of foundry goods if add fiber.
4, this method is specially adapted to orientation, single crystal blade and has less wall thickness parts of Casting.
Accompanying drawing explanation
Fig. 1 is shell schematic diagram.
Fig. 2 is cross section enlarged diagram after common shell shell.
Fig. 3 is shell cross section enlarged diagram after interpolation carbon fiber-containing.
Detailed description of the invention
Embodiment 1
Make 10 certain small-sized thin-walled workpiece, contour dimension is about 60mm × 100mm × 250mm.
Each for back-up coat layer refractory material powder 320# bauxite powder and GRJ26 type Ludox are taken material according to the ratio of mass ratio 4-4.5:1, add in agitator together with polyster fibre and mix, mixing speed 400-500r/min, stir 24h, add the defoamer n-butanol accounting for each layer Ludox quality 0.5 ~ 1wt% and the wetting agent stearic acid accounting for each layer Ludox quality 0.5 ~ 1wt% again, and by deionized water, dope viscosity is adjusted to scope needed for each coating of back-up coat, obtain the reinforced layered slurry that each layer adds polyster fibre, last slurry seal coating does not add polyster fibre, wherein, polyster fibre adds 0.5 ~ 0.7wt% that quality is each layer powder quality of back-up coat, and fibre diameter is
length is 2-5mm,
Conveniently process for making shell coats ground floor and the superficial layer coating of shell on wax-pattern, superficial layer is the aluminium oxide coating of not carbon fiber-containing, and after stucco drying, back-up coat coats 5 layers altogether and coats the slurry seal coating slurry seal of not adding carbon fiber-containing again containing after polyster fibre reinforced layered slurry; Shell, after dewaxing, carries out roasting in electric furnace, and roasting technique is 300 DEG C × 1h+500 DEG C × 1h+700 DEG C × 2h+930 DEG C × 2h.
Pour into a mould with this shell, the cast(ing) surface obtained is smooth, eliminates gas hole defect, qualification rate 100%.
Comparative example 1
Make certain small-sized thin-walled workpiece described in 10 embodiments 1.
By back-up coat each layer refractory material powder 320# bauxite powder identical for same embodiment 1 ratio and GRJ26 type Ludox, add mix and blend 24h in agitator, mixing speed 400-500r/min, add the defoamer n-butanol accounting for Ludox quality 0.5 ~ 1wt% and the wetting agent stearic acid accounting for Ludox quality 0.5 ~ 1wt% again, and by deionized water, dope viscosity is adjusted to scope needed for each coating of back-up coat, namely obtain each layer reinforced layered slurry;
Conveniently process for making shell coats ground floor and the superficial layer coating of shell on wax-pattern, and superficial layer is aluminium oxide coating, and back-up coat coats slurry seal layer slurry seal after coating 5 layers of reinforced layered slurry altogether again; Shell is after dewaxing, and in electric furnace, carry out roasting, roasting technique for be warmed up to 930 DEG C from 300 DEG C and to be incubated 2h for 4 hours.
Pour into a mould with this shell, the part cast(ing) surface out-of-flatness obtained, has gas hole defect, qualification rate 60%.
Fig. 1 is conventional casting shell molds schematic diagram, if cast time shell or alloy in gas flow more, not by shell wall discharge, gas will be gathered in shell inwall (outer surface of foundry goods), thus form the defect such as pore or cold shut at cast(ing) surface, cause foundry goods to scrap.
Fig. 2 is cross section enlarged diagram after comparative example 1 shell shell, and whole cross section is made up of sand material and powder, powder compact siro spinning technology, almost very close to each other.
Fig. 3 is the shell schematic cross-section after embodiment 1 adds fiber, can see, leave netted passage after fiber roasting, different interchannel overlaps in length and breadth, and define the passage that gas is discharged, gas is easily discharged, thus decreases casting defect, improves the qualification rate of foundry goods.
Embodiment 2
Make 10 certain blade parts, contour dimension is about 150mm × 50mm × 20mm.
Each for back-up coat layer refractory material powder 320# electrofused mullite powder and GRJ26 type Ludox are taken material according to the ratio of mass ratio 3.5-4:1, part Ludox is poured in agitator, being divided by load weighted each layer powder pours in agitator 3 ~ 4 times, limit bevelling uses mixer to stir, mixing speed 400-500r/min, aramid fiber is blended in last batch of powder and adds agitator, add remaining Ludox mix and blend 27h again, finally add the defoamer n-butanol accounting for each layer Ludox quality 0.5 ~ 1wt% and the wetting agent stearic acid accounting for each layer Ludox quality 0.5 ~ 1wt%, and by deionized water, dope viscosity is adjusted to scope needed for each coating of back-up coat, obtain the reinforced layered slurry that each layer adds carbon fiber-containing, last slurry seal coating does not add aramid fiber, wherein, aramid fiber adds 1.3 ~ 1.5wt% that quality is back-up coat powder quality, and fibre diameter is
length is 2-5mm,
Conveniently process for making shell coats ground floor and the superficial layer coating of shell on wax-pattern, superficial layer adopts the electro-corundum powder coating of not carbon fiber-containing, and after stucco drying, back-up coat coats 6 layers altogether containing after aramid fiber reinforced layered slurry, then coat and do not add carbon fiber-containing slurry seal coating slurry seal; Shell, after dewaxing, carries out roasting in gas furnace, and roasting technique is 300 DEG C × 1h+500 DEG C × 1h+750 DEG C × 3h+980 DEG C × 2h.
Pour into a mould with this shell, cast(ing) surface is smooth, the surface fluorescence display problem eliminated gas hole defect and cause due to shell poor air permeability, qualification rate 100%.
Embodiment 3
Make 4 certain large-sized annular parts, contour dimension is about
Each for back-up coat layer refractory material powder 320# electro-corundum powder and GRJ26 type Ludox are taken material according to the ratio of 3.5-4.5:1, part Ludox is poured in agitator, load weighted powder is divided and pours in agitator 3 ~ 4 times, limit bevelling uses mixer to stir, mixing speed 400-500r/min, aramid fiber is blended in last batch of powder and adds agitator, add remaining Ludox mix and blend 30h again, finally add the defoamer n-butanol accounting for each layer Ludox quality 0.5 ~ 1wt% and the wetting agent stearic acid accounting for each layer Ludox quality 0.5 ~ 1wt%, and by deionized water, dope viscosity is adjusted to scope needed for each coating of back-up coat, obtain the reinforced layered slurry that each layer adds aramid fiber, last slurry seal coating does not add aramid fiber, wherein, aramid fiber adds 2.5 ~ 3wt% that quality is back-up coat powder quality, and aramid fiber diameter is
length is 2-5mm,
Conveniently process for making shell coats ground floor and the superficial layer coating of shell on wax-pattern, superficial layer adopts the cobalt aluminate coating of not carbon fiber-containing, back-up coat coats 11 layers altogether containing after aramid fiber reinforced layered slurry, then coats and do not add carbon fiber-containing slurry seal coating slurry seal; Shell, after dewaxing, carries out roasting in electric furnace, and roasting technique is 300 DEG C × 1h+500 DEG C × 1h+800 DEG C × 3h+930 DEG C × 2h.。
Pour into a mould with this shell, foundry goods eliminates pore, surface crater defect, and sub-surface porosity defect reduces, qualification rate 100%.
Claims (10)
1. increase a method for model casting ceramic shell gas permeability, it is characterized in that, concrete operation step is as follows:
(1) the carbon fiber-containing coating of shell is prepared
Binding agent, each layer powder of back-up coat and carbon fiber-containing are added agitator, after stirring, add defoamer and wetting agent again, and by deionized water, said mixture viscosity is adjusted to scope needed for each coating of back-up coat, namely obtain the reinforced layered slurry that each layer adds carbon fiber-containing;
Wherein, described carbon fiber-containing is terylene, aramid fiber;
(2) shell is prepared
Conveniently process for making shell coats the superficial layer coating of shell on wax-pattern, and this coating does not add carbon fiber-containing, and after stucco drying; Use the obtained each layer reinforced layered slurry of step (1) to complete again and hang painting, stucco, dry process, finally coat the slurry seal layer drying that do not add carbon fiber-containing again, obtain shell; Shell is through dewaxing, and roasting in a conventional manner in roaster, and 700 DEG C-800 DEG C insulations after 2-3 hour, then continue to be warming up to and burn temperature eventually, obtains the network structure ceramic shell with exhaust passage.
2. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the addition of carbon fiber-containing described in step (1) is the 0.5-3wt% of each layer powder quality of back-up coat.
3. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the specification of the carbon fiber-containing described in step (1) is diameter
length 2-5mm.
4. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the back-up coat powder described in step (1) is electrofused mullite powder, electro-corundum powder or bauxite; Described binding agent is Ludox or silester.
5. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the mass ratio of the back-up coat each layer powder described in step (1) and each layer binder is 3.5 ~ 4.5:1.
6. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the defoamer described in step (1) is n-butanol; Described wetting agent is stearic acid.
7. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the defoamer addition described in step (1) is 0.5% ~ 1.0wt% of each layer binder quality; Described wetting agent addition is 0.5% ~ 1.0wt% of each layer binder quality.
8. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the agitating mode described in step (1) is: mixing speed 400-500r/min, stirs 24 ~ 30 hours.
9. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the back-up coat described in step (2) is hung and is coated with the number of plies is 5 ~ 11 layers.
10. a kind of method increasing model casting ceramic shell gas permeability according to claim 1, is characterized in that, the roaster described in step (2) is electric furnace or gas furnace.
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| CN105290313A (en) * | 2015-10-27 | 2016-02-03 | 上海航天精密机械研究所 | Method for improving deformability of oxide ceramic shells precisely cast by titanium-aluminum alloy |
| CN105834361A (en) * | 2016-04-01 | 2016-08-10 | 江苏大学 | Method for preparing modified ceramic mold shell through special-shaped cross section short carbon fibers |
| CN105921679A (en) * | 2016-05-12 | 2016-09-07 | 杜忠维 | Modified ceramic shell mold and manufacturing method thereof |
| CN106975729A (en) * | 2017-03-07 | 2017-07-25 | 宁波麦克潘特电动工具有限公司 | A kind of lost-wax casting method of drill bit |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |