CN103252448B - A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade - Google Patents
A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade Download PDFInfo
- Publication number
- CN103252448B CN103252448B CN201310151402.7A CN201310151402A CN103252448B CN 103252448 B CN103252448 B CN 103252448B CN 201310151402 A CN201310151402 A CN 201310151402A CN 103252448 B CN103252448 B CN 103252448B
- Authority
- CN
- China
- Prior art keywords
- slurry
- formwork
- sand
- ludox
- wax
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade, comprise the following steps: A1, process for making shell: (1) slurry preparation; (2) hanging; (3) sand is drenched; (4) above operation is repeated, until predetermined number of layers; (5) slurry seal, immerses wax-pattern in slurry bucket, fully infiltrates, take out, dry; A2, is wound around carbon fiber and drying.The present invention adopts the coated of carbon fiber, compared with traditional Ludox formwork, under the prerequisite ensureing formwork calorific intensity, decreases the formwork number of plies, thus reduces the integral thickness of formwork, improve the capacity of heat transmission of formwork, be conducive to the raising of thermograde.Carbon cloth of the present invention is micro crystal graphite material, thermal conductivity factor λ
2reaching more than 100, be desirable Heat Conduction Material, and tensile strength is at more than 3400MPa, for the thinning of formwork creates condition.
Description
Technical field
The present invention relates to the manufacturing process problem of high temperature alloy directional solidification field, particularly single crystal turbine blade, be specially and utilize carbon fiber to be coated with to prepare thin-wall high-strength mold shell.
Background technology
Utilize the directional solidification of high temperature alloy to carry out casting single crystal turbo blade, become one of key technology manufacturing efficient aero-engine.The production of current this blade all utilizes Bridgman directional solidification to carry out.For this reason, after ceramic shell mould needs first to be preheating to the melting temperature higher than alloy in the hot-zone of upper of furnace body, pour into the high temperature alloy liquation by induction melting, then formwork slowly declines with predetermined speed, enter the cold-zone of lower portion of furnace body through thermal baffle, whole foundry goods cools gradually from the bottom to top and solidifies.Utilize the spiral crystal selector of shell mould bottom, can make only to have a crystal grain by and expand to whole foundry goods.Owing to eliminating the weakest link under this high temperature operating conditions of crystal boundary, the high-temperature behavior of blade is greatly improved, and the life-span also improves tens times.Along with continuing to increase of blade of aviation engine size, and large scale industry gas turbine is to the active demand of single crystal blade, makes the production of large-scale blades become the key issue being badly in need of solution.
In order to manufacture large-sized single crystal blade or foundry goods, the thickness of ceramic case must be strengthened, to ensure enough intensity to be maintained during cast and long directional solidification.But the increase of formwork thickness, make the cooling of foundry goods become very difficulty, cause freezing interface thermograde to reduce, easily produce casting flaw and the low inferior problem of productivity ratio.In order to improve the cooling velocity of foundry goods, the especially thermograde of freezing interface, people have attempted the way of utilization liquid metals cooling (LMC) and gas cooling (GC).Although these two kinds of methods have certain effect, the heat-sinking capability on formwork surface can only be strengthened, the huge thermal resistance problem of thick formwork itself can not be solved.For large-scale blades, foundry goods is difficult to outwards dispel the heat through formwork.In addition these two kinds of methods need be transformed body of heater, and need add a large amount of auxiliary equipment, and casting process becomes very complicated, and production cost increases greatly.Though therefore these two kinds of methods are through the large quantity research of more than ten years, fail so far to be applied in production.
Therefore set about reducing its wall thickness from formwork manufacture craft, ensure its elevated temperature strength simultaneously, the radiating rate having solidified part can not only be improved in single crystal preparation process, the formation producing the bad defects such as folder crystalline substance can also be greatly reduced.
Summary of the invention
Technical problem to be solved by this invention provides a kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade for the deficiencies in the prior art.
Technical scheme of the present invention is as follows:
For the thin-wall high-strength mold shell preparation method that single crystal blade manufactures, comprise the following steps: A1 process for making shell: (1) slurry preparation, slurry adopts JN-30 Ludox to make binding agent, and high-purity corundum powder is preparation of powder; First a certain amount of Ludox is poured in mixed slurry bucket; Add JFC wetting agent again to ensure the being coated with property of slurry on wax-pattern, its addition is about the 0.1%-0.5% of Ludox quality; Then add schmigel, addition is about 1: 3 according to Ludox and schmigel mass ratio; Finally add XP-1 silicone defoaming agent to ensure uniformity and the integrality of slurry, addition is about the 0.05%-0.02% of Ludox quality; Slurry is stand-by be uniformly mixed 20 ~ 30 hours in barrel after;
(2) hanging, immerses the several seconds in size barrel by the wax-pattern assembled, takes out, brush gently, to remove bubble and to make slurry be coated with evenly with compressed air;
(3) drench sand, namely carry out pouring sand after hanging, repeatedly rotate wax-pattern, sand is uniformly distributed; Before hanging next time, blow floating sand;
(4) above operation is repeated, until predetermined number of layers; More past skin, sand grains diameter is larger, and slurry viscosity should be lower gradually;
(5) slurry seal, immerses wax-pattern in slurry bucket, fully infiltrates, take out, dry;
A2 is wound around carbon fiber and drying;
Carry out routine dewaxing, roasting after making formwork, to be cooled to after room temperature at outer brushing slurry, carbon fiber to be placed in slurry simultaneously and to soak, after taking-up, carbon cloth is wound around along formwork profile, coated, extrude air, be wound around one deck.Then carry out drying, drying condition: baking temperature 25 ± 5 DEG C, humidity≤50%, drying time 20-50h, wind speed 2-8ms
-1.
Beneficial effect of the present invention is:
The present invention adopts the coated of carbon fiber, compared with traditional Ludox formwork, under the prerequisite ensureing formwork calorific intensity, decreases the formwork number of plies, thus reduces the integral thickness of formwork, improve the capacity of heat transmission of formwork, be conducive to the raising of thermograde.The capacity of heat transmission of traditional silicon colloidal sol formwork is by die casing material, and the restriction of porosity, when obtaining enough calorific intensitys, is difficult to reach perfect condition (λ
1< 0.56W/ (mK)).And carbon cloth of the present invention, be micro crystal graphite material, thermal conductivity factor λ
2reaching more than 100, be desirable Heat Conduction Material, and tensile strength is at more than 3400MPa, for the thinning of formwork creates condition.
Accompanying drawing explanation
Fig. 1 is the heat radiation schematic diagram of prior art;
Fig. 2 is heat radiation schematic diagram of the present invention;
Fig. 3 be carbon fiber bundle answer force-stretching curve;
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
1. process for making shell
Different with common precision-investment casting formwork, the formwork for monocrystalline directional solidification not only needs excellent elevated temperature strength, and requires that formwork has stronger heat dispersion.Therefore, mainly adopt low-density ceramic slurry when shell processed, fine granularity sand grains drenches sand.Concrete technology flow process is as follows.
(1) slurry preparation, slurry adopts Ludox to make binding agent (model: JN-30), high-purity corundum powder (Al
2o
3content is greater than 99%, granularity 320 order) be preparation of powder.
First poured into by a certain amount of Ludox in mixed slurry bucket, pouring volume as required consumption is selected; Add wetting agent (JFC, non-ionic surface active agent) again to ensure the being coated with property of slurry on wax-pattern, its addition is about the 0.1%-0.5% of Ludox quality; Then add schmigel, addition is about 1: 3 according to Ludox and schmigel mass ratio; Finally add defoamer (XP-1 organosilicon) to ensure uniformity and the integrality of slurry, addition is about the 0.05%-0.02% of Ludox quality; Slurry is stand-by be uniformly mixed 20 ~ 30 hours in barrel after.
(2) hanging, immerses the several seconds in size barrel by the wax-pattern assembled, takes out, brush gently, to remove bubble and to make slurry be coated with evenly with compressed air;
(3) drench sand, namely carry out pouring sand (melting emergy, it requires as shown in table 1) after hanging, repeatedly rotate wax-pattern, sand is uniformly distributed.Before hanging next time, blow floating sand;
(4) above operation is repeated, until predetermined number of layers.Repeat in hanging sand process, hanging can, according to actual production operating feature, can utilize same slurry to carry out in single-piece or laboratory.Also suitably can regulate the viscosity of slurry when producing in batches according to the change of drenching sand Central Plains fineness of sand, multiple slurry cylinder is set, hanging respectively.In general, more past skin, sand grains diameter is larger, slurry viscosity should gradually lower (as 1-2 layer 100 order, slurry 30s; 3-4 layer 80 order, slurry 25s).
(5) slurry seal, immerses wax-pattern in slurry bucket, fully infiltrates, take out, dry.Slurry seal slurry can adopt same slurry with previous process when single-piece production, can according to aforementioned preparation special sizing agent when producing in batches, and its slurry viscosity should be minimum.
Its technological parameter as listed in table 1.
Table 1 process for making shell parameter
2. be wound around carbon fiber and drying
Carry out routine dewaxing, roasting after making formwork, to be cooled to after room temperature at outer brushing slurry, carbon fiber to be placed in slurry simultaneously and to soak, after taking-up, carbon cloth is wound around along formwork profile, coated, extrude air, be wound around one deck.Then carry out drying, drying condition is as shown in table 2.The performance requirement of the present invention's carbon cloth used meets shown in table 3.
Table 2 Drying Technology Parameter
| Baking temperature/DEG C | Humidity/% | Drying time/h | Wind speed/ms -1 |
| 25±5 | ≤50 | 20-50 | 2-8 |
The performance requirement of table 3 carbon cloth
Fig. 1 is heat radiation schematic diagram, and heat reaches the right (cold house) from the left side (solidifying) by formwork, in traditional formwork, supposes that the formwork number of plies is three layers;
The heat transmitted is
Φ＝(t
1-t
4)/(l
1/λ
1A+l
2/λ
2A+l
3/λ
3A)
Wherein Φ-heat output (W)
λ-thermal conductivity factor (thermal conductivity), λ
1, λ
2, λ
3be respectively the thermal conductivity factor of the 1st, 2,3 layer;
A-heat transfer area (m
2);
T-temperature (K), t
1, t
2, t
3be respectively the temperature of the 1st, 2,3 layer;
L-thickness (m), l
1, l
2, l
3be respectively the thickness of the 1st, 2,3 layer.
Make λ
1=λ
2=λ
3;
l
1＝l
2＝l
3；
l
1/A＝l′
3/A
2＝l
Then Φ=(t
1-t
4)/(3/ λ
1) 1.
And in the present invention, the formwork number of plies is become two-layer, third layer change into carbon fiber winding (l '
3represent carbon fiber layer), as Fig. 2.
The heat then transmitted is
Φ′＝(t
1-t
4)/(2l
1/λ
1A+l′
3/λA
2)
Φ′＝(t
1-t
4)/(2/λ
1+1/λ) ②
More 1., 2., wherein λ > λ
1, then Φ ' > Φ.
Namely compare conventional method, the present invention makes more heats be distributed in cold house in directional solidification, to improve thermograde, is beneficial to the growth of column crystal/monocrystalline.
Fig. 3 be carbon fiber bundle answer force-stretching curve, high tensile strength suffices to show that carbon fibre cloth layer meets the strength demand of experiment.
Embodiment 2
1. formwork technique:
Prepare 6 layers of shell mould, its slurry configuration, hanging, pouring sand, slurry seal process are with embodiment 1, and concrete parameter request is as shown in table 4.
Table 4 process for making shell parameter
2. fiber coating drying process:
The shell mould prepared, with embodiment 1, is carried out dewaxing, after roasting, is wound around fiber, carries out drying by table 5 technique.Obtain shell mould, be applied in VDF-10 single crystal growing furnace and carry out directional solidification, successfully obtain monocrystalline sample.
Table 5 Drying Technology Parameter
| Baking temperature/DEG C | Humidity/% | Drying time/h | Wind speed/ms -1 |
| 25±5 | ≤50 | 30-40 | 3-5 |
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (1)
1. for the thin-wall high-strength mold shell preparation method that single crystal blade manufactures, it is characterized in that, comprise the following steps: A1 process for making shell: (1) slurry preparation, slurry adopts JN-30 Ludox to make binding agent, and high-purity corundum powder is preparation of powder; First a certain amount of Ludox is poured in mixed slurry bucket; Add JFC wetting agent again to ensure the being coated with property of slurry on wax-pattern, its addition is the 0.1%-0.5% of Ludox quality; Then add schmigel, addition is 1: 3 according to Ludox and schmigel mass ratio; Finally add XP-1 silicone defoaming agent to ensure uniformity and the integrality of slurry, addition is the 0.05%-0.02% of Ludox quality; Slurry is stand-by be uniformly mixed 20 ~ 30 hours in barrel after;
(2) hanging, immerses the several seconds in size barrel by the wax-pattern assembled, takes out, brush gently, to remove bubble and to make slurry be coated with evenly with compressed air;
(3) drench sand, namely carry out pouring sand after hanging, repeatedly rotate wax-pattern, sand is uniformly distributed; Before hanging next time, blow floating sand;
(4) above operation is repeated, until predetermined number of layers; More past skin, sand grains diameter is larger, and slurry viscosity should be lower gradually;
(5) slurry seal, immerses wax-pattern in size barrel, fully infiltrates, and takes out, dry;
A2 is wound around carbon fiber and drying;
Carry out routine dewaxing, roasting after making formwork, to be cooled to after room temperature at outer brushing slurry, carbon fiber to be placed in slurry simultaneously and to soak, after taking-up, carbon cloth is wound around along formwork profile, coated, extrude air, be wound around one deck; Then carry out drying, drying condition: baking temperature 25 ± 5 DEG C, humidity≤50%, drying time 20-50h, wind speed 2-8ms
-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310151402.7A CN103252448B (en) | 2013-04-19 | 2013-04-19 | A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310151402.7A CN103252448B (en) | 2013-04-19 | 2013-04-19 | A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103252448A CN103252448A (en) | 2013-08-21 |
| CN103252448B true CN103252448B (en) | 2015-09-09 |
Family
ID=48956852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310151402.7A Expired - Fee Related CN103252448B (en) | 2013-04-19 | 2013-04-19 | A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103252448B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706760B (en) * | 2014-01-06 | 2016-06-22 | 安徽厚林精密金属科技有限公司 | A kind of casting method of meat grinder top cover |
| CN104550728A (en) * | 2014-02-24 | 2015-04-29 | 铜陵深源工贸有限责任公司 | Fabrication method of valve mold shell |
| CN104259442B (en) * | 2014-09-29 | 2017-04-05 | 江苏大学 | A kind of method for preventing single crystal blade from producing stray crystal defect |
| CN104439076A (en) * | 2014-12-08 | 2015-03-25 | 中国南方航空工业(集团)有限公司 | Method for controlling grain size of casting |
| CN104826995A (en) * | 2015-05-25 | 2015-08-12 | 东方电气集团东方汽轮机有限公司 | Vertical ceramic mold shell and molding method thereof |
| CN106311980B (en) * | 2015-07-07 | 2018-06-19 | 中国科学院金属研究所 | A kind of preparation method of high temperature alloy orientation/single crystal blade casting ceramic shell |
| CN105772633B (en) * | 2015-12-28 | 2018-05-11 | 浙江亚辰新材料科技有限公司 | A kind of turbo blade hot investment casting directional freeze method |
| 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 |
| CN108941458B (en) * | 2018-08-30 | 2020-06-23 | 西安航天发动机有限公司 | Preparation method of large semi-closed inner cavity shell |
| CN112371914B (en) * | 2020-10-28 | 2021-12-28 | 上海交通大学 | Pretreatment method for eliminating bubbles in deep groove and corner in product structure in shell manufacturing process |
| CN113182494A (en) * | 2021-05-07 | 2021-07-30 | 西安医学院 | Preparation method of high-strength fiber formwork for single crystal blade |
| CN113649528A (en) * | 2021-08-20 | 2021-11-16 | 泰州市金鹰精密铸造有限公司 | Method for preparing thin-wall high-strength investment casting formwork |
| CN113664184A (en) * | 2021-08-20 | 2021-11-19 | 泰州市金鹰精密铸造有限公司 | Casting process based on high-strength composite carbon fiber single crystal blade |
| CN114082891A (en) * | 2021-11-24 | 2022-02-25 | 江苏永瀚特种合金技术股份有限公司 | Method for reinforcing formwork by adopting carbon fibers |
| CN114570879B (en) * | 2022-03-09 | 2024-06-21 | 上海大学 | Ceramic shell for monocrystal superalloy blade and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1895814A (en) * | 2005-07-14 | 2007-01-17 | 李士良 | Efficient lost-wax composite coating |
| CN101823123A (en) * | 2009-10-30 | 2010-09-08 | 沈阳黎明航空发动机(集团)有限责任公司 | Manufacturing method of shangdian soil type shell used for heavy gas turbine plant guide vane investment casting |
| CN101927321A (en) * | 2010-09-03 | 2010-12-29 | 北京钢研高纳科技股份有限公司 | Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting |
-
2013
- 2013-04-19 CN CN201310151402.7A patent/CN103252448B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1895814A (en) * | 2005-07-14 | 2007-01-17 | 李士良 | Efficient lost-wax composite coating |
| CN101823123A (en) * | 2009-10-30 | 2010-09-08 | 沈阳黎明航空发动机(集团)有限责任公司 | Manufacturing method of shangdian soil type shell used for heavy gas turbine plant guide vane investment casting |
| CN101927321A (en) * | 2010-09-03 | 2010-12-29 | 北京钢研高纳科技股份有限公司 | Method for preparing high-air permeability and high-strength ceramic shell mold for anti-gravity casting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103252448A (en) | 2013-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103252448B (en) | A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade | |
| CN102166643B (en) | Method for preventing monocrystal blades from having mixed crystal defects | |
| CN105834361B (en) | A kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork | |
| CN103880406B (en) | A kind of preparation method of silicon oxide ceramics core of improvement | |
| CN101734910B (en) | Method for preparing porous alumina ceramic core | |
| CN106563773B (en) | A kind of method that monocrystal blades from having mixed crystal defects is prevented based on laser heating technique | |
| CN105290313B (en) | A kind of method for improving titanium-aluminium alloy hot investment casting New Oxide Ceramic Shell Mould deformability | |
| CN102744366B (en) | Preparation method of titanium aluminium-based and niobium silicon-based alloy directional solidification investment precision casting mold shell | |
| CN103192062A (en) | Mold case for producing high-temperature alloy single crystal blades | |
| CN104384449B (en) | A kind of method controlling essence casting turbo blade grain size | |
| CN102366819A (en) | Method for precision casting of titanium alloy | |
| CN110227797B (en) | Preparation process of three-dimensional printing ceramic shell for titanium alloy casting | |
| CN103056340B (en) | Method for casting surface layer by using TiAlC-base ceramic powder as metal and titanium alloy | |
| CN207619552U (en) | A kind of directional solidification furnace center heating and central cooling device | |
| CN103192063A (en) | Casting mold for producing high-temperature alloy single crystal blades and directional solidification device thereof | |
| CN105272181A (en) | Preparation technology of composite ceramic core | |
| CN104384452A (en) | Preparation technique for thin-walled silica-based ceramic mold core | |
| CN104259442A (en) | Method for preventing single crystal blade from generating miscellaneous crystal defect | |
| CN104593630B (en) | Directional solidifying preparation method of lotus-shaped porous aluminum | |
| CN103509973A (en) | Precisely cast blade and manufacturing method thereof | |
| Huo et al. | In-situ synthesis of high-performance Al2O3-based ceramic cores reinforced with core-shell structures | |
| CN106518027A (en) | Preparation method of shell synchronously modified by mineralizing agent and chopped carbon fibers | |
| CN109304424A (en) | Modified oxidized silicon powder and preparation method thereof, ceramic core and preparation method thereof | |
| Liang et al. | Study on the preparation and microstructure of a single-crystal hollow turbine blade | |
| CN101947648A (en) | Method for producing large zirconium and zirconium alloy casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Jiangsu University Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Jiangsu University Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20180419 |