CN102166643A - Method for preventing monocrystal blades from having mixed crystal defects - Google Patents
Method for preventing monocrystal blades from having mixed crystal defects Download PDFInfo
- Publication number
- CN102166643A CN102166643A CN 201110077543 CN201110077543A CN102166643A CN 102166643 A CN102166643 A CN 102166643A CN 201110077543 CN201110077543 CN 201110077543 CN 201110077543 A CN201110077543 A CN 201110077543A CN 102166643 A CN102166643 A CN 102166643A
- Authority
- CN
- China
- Prior art keywords
- blade
- heat insulating
- insulating block
- formwork
- single crystal
- 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.)
- Granted
Links
Images
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention relates to the field of directional solidification of alloys, particularly relates to a method for preventing monocrystal blades from having mixed crystal defects. The method is characterized in that in the process of preparing an investment casting mould case for monocrystal blade production, a ceramic fiber insulation block is implanted into the position on a mould case at a blade margin plate at which is easy to have mixed crystal defects, the ceramic fiber insulation block is prefabricated into a U-shaped block according to the shape of the mould case at the blade margin plate, and a U-shaped cavity of the ceramic fiber insulation block contains all mould cases at the blade margin plate. The method disclosed by the invention has the advantages that through using the characteristics that the thermal conductivity of the ceramic fiber insulation block is extremely low, the liquidus temperature TL-isotherm form (see Figure 2) generated when a solidification front reaches the monocrystal blade margin plate in the process of alloy solidification at the monocrystal blade margin plate is controlled reasonably, so that when the margin plate is close to a directional solidification thermal baffle plate area, the heats are mainly outputted by a monocrystal blade body, and the spontaneous nucleation at the margin plate is avoided, thereby ensuring the smooth growth of monocrystals.
Description
Technical field
The present invention relates to alloy directionally solidified field, especially a kind of method that prevents single crystal blade stray crystal defective.
Background technology
Gas turbine is little with its distinctive volume, in light weight, power is big, start fast, the characteristics that auxiliary device waits less, at first obtained extensive use in the aero-engine field, for function and the efficient that improves aero-engine, people successfully utilize the high temperature alloy directional solidification technique that turbine blade is made the monocrystalline form, make the hot operation life-span of blade improve tens times, continuous progress along with gas turbine technology, the single gas turbine that is applied to aviation field of script, at electric power, traffic, the naval vessel, tank, oil, chemical industry, municipal administration, numerous areas such as light textile are widely used, the most in the last thirty years, in the blade manufacturing that the single crystal blade technology of aero-engine is applied to the large scale industry gas turbine, significantly improved industry gas turbine efficient; Because the blade dimensions of industry gas turbine is much larger than aerial blade, make the production of its single crystal casting become very difficult, one of subject matter that runs in the complex-shaped single crystal turbine blade process of directional solidification technique production can form stray crystal exactly at present, at the blade edge plate portion since foundry goods in the long-pending sudden change of vertical heat flow direction upper section, be easy to produce new crystal grain forming core, grow up.Owing to removed the intercrystalline strengthening element in the single crystal alloy, so the crystal boundary of these stray crystals will become the weak link of single crystal blade, become formation of crack in the use, finally cause the fracture of blade, by various technological approaches, improving the Temperature Distribution in the single crystal casting directional solidification process, prevent that stray crystal from appearring in the part, is the important technology of single crystal blade preparation.
Chinese patent CN101537484A discloses a kind of method that can effectively improve Temperature Distribution in the process of single crystal casting solidification, be specially: after molten (wax) mould surface first or second layer ceramic case form, heat conductor is bonded in casting solidification is prone to thermal boundary in outside diabatic process position with the system shell with ceramic size, and heat conductor is graphite or SiC; By the same preparation method of common precise casting mould shell, hang coating, stucco, spread behind the sand and to have carried out sintering after the long-pending sand of heat conductor outer end erased, this invention is by implanting a heat carrier, the heat at integral shroud interior angle A place in time can be shed, it is cooled to rapidly below the liquidus temperature, and the crystal growth of blade our department can enter integral shroud rapidly and to the expansion of outer rim B place, avoid herein because of the cold stray crystal that produces of long-time mistake.
Summary of the invention
The object of the present invention is to provide a kind of method that prevents single crystal blade stray crystal defective, in the single crystal blade preparation process, use the present invention, can significantly improve the horizontal temperature distribution evenness of single crystal blade listrium at the thermal insulation board near zone, significantly the probability of stray crystal defective appears in reduction, thereby obviously improves the single crystal blade yield rate.
The present invention relates to a kind of method that prevents single crystal blade stray crystal defective, it is characterized by: be used for the process of the investment casting formwork that single crystal blade produces in preparation, the ceramic fibre heat insulating block is implanted in the formwork at blade listrium place that the stray crystal defective appears in single crystal blade easily.
Described ceramic fibre heat insulating block during by 1250 ℃ thermal conductivity be prefabricated into the U type less than the pyroceram fibre module of 0.4 W/ (mK) according to the formwork shape at blade listrium place, and can make the U type inner chamber of ceramic fibre heat insulating block comprise whole formworks at listrium place.
Ceramic fibre heat insulating block method for implantation is specially: prepare according to conventional full form casting process the single crystal blade formwork the first six or after seven layers, the U type inner chamber of the prefabricated ceramic fibre heat insulating block of outer shape according to listrium place formwork this moment, and make U type heat insulating block can cover whole positions of listrium formwork, heat insulating block thickness 3～5mm, as shown in Figure 1; As binding agent the ceramic fibre heat insulating block is bonded in blade edge template die shell outside with system shell slurry then; According to common process the formwork preparation is finished afterwards.
Described pyroceram fibre module is meant anti-ceramic fibre more than 1450 ℃.
The difference of the present invention and Chinese patent CN101537484A is: the present invention utilizes the extremely low characteristics of ceramic fibre heat insulating block thermal conductivity, the liquidus temperature T when solidification front arrives single crystal blade listrium place when rationally having controlled single crystal blade listrium place alloy graining
L-thermoisopleth form (Fig. 2), when making listrium near directional solidification thermal insulation board zone, heat is mainly derived by the single crystal blade main body, has avoided the spontaneous nucleation at listrium place, thereby guarantee the monocrystalline smooth growth, different with Chinese patent CN101537484A by the heat carrier of implanting high thermal conductivity.
The present invention is simple to operate, does not need to transform apparatus for directional solidification, significantly suppresses the stray crystal defective, can significantly improve the single crystal blade yield rate.
Description of drawings
Fig. 1: single crystal blade ceramic fibre heat insulating block schematic diagram;
Fig. 2: the liquidus temperature T when solidification front arrives single crystal blade listrium place in the directional solidification process
L-thermoisopleth form, when a) having the ceramic fibre heat insulating block, solidification front T
L-thermoisopleth is comparatively straight; When b) not having the ceramic fibre heat insulating block, cool region appears crossing on a large scale in the listrium outer end, very easily produces spontaneous nucleation, causes the stray crystal defective;
Single crystal blade structure chart in Fig. 3: embodiment and the Comparative Examples.
The specific embodiment
Embodiment
Apply the present invention to a kind of single crystal blade (Fig. 3) production, blade material is high temperature alloy CMSX-4, the SILCASTACK-160 type ceramic fibre module that the raw material of ceramic fibre heat insulating block selects for use SILCA Service-und Vertriebsgesellschaft fuer Daemmstoffe mbH company to produce, 1600 ℃ of heatproofs, thermal conductivity 0.31 W/ (mK) in the time of 1250 ℃.In blade aluminium oxide formwork preparation process, at first prepare the first seven layer of single crystal blade formwork according to conventional full form casting process; According to the U type inner chamber of outer shape prefabricated thermal insulation piece of blade listrium place formwork this moment, and make heat insulating block can cover whole positions of listrium formwork, heat insulating block thickness 3～5mm; As binding agent heat insulating block is bonded in listrium formwork outside with system shell slurry then; According to common process the formwork preparation is finished afterwards, the directional solidification process is carried out according to the common process parameter, produces 12 in blade altogether, through the check of routine tissue, has 2 blades the small size stray crystal to occur in the listrium outer end position, and the stray crystal ratio of defects is 16.7%.
Comparative Examples
According to identical materials, technological parameter and working condition in the foregoing description, produce 12 in identical blade, but do not adopt ceramic fibre heat insulating block of the present invention, check through the routine tissue, there are 7 blades stray crystal to occur at the listrium place, and most of volume is bigger, wherein has the stray crystal of 5 blades to grow into the blade body position, and the stray crystal ratio of defects is 58.3%.
Claims (3)
1. method that prevents single crystal blade stray crystal defective, it is characterized by: the process that is used for the investment casting formwork of single crystal blade production in preparation, the ceramic fibre heat insulating block is implanted in the formwork at blade listrium place that the stray crystal defective appears in single crystal blade easily, described ceramic fibre heat insulating block is prefabricated into the U type by the pyroceram fibre module according to the formwork shape at blade listrium place, and can make the U type inner chamber of ceramic fibre heat insulating block comprise whole formworks at listrium place.
2. a kind of method that prevents single crystal blade stray crystal defective as claimed in claim 1, it is characterized by: described ceramic fibre heat insulating block method for implantation is specially: prepare according to conventional full form casting process the single crystal blade formwork the first six or after seven layers, the U type inner chamber of the prefabricated ceramic fibre heat insulating block of outer shape according to listrium place formwork this moment, and make U type heat insulating block can cover whole positions of listrium formwork, heat insulating block thickness 3～5mm is bonded in blade edge template die shell outside as binding agent with the ceramic fibre heat insulating block with system shell slurry then; According to common process the formwork preparation is finished afterwards.
3. a kind of method that prevents single crystal blade stray crystal defective as claimed in claim 1 is characterized by: described pyroceram fibre module is meant anti-ceramic fibre more than 1450 ℃, and thermal conductivity is less than 0.4 W/ (mK) in the time of 1250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110077543 CN102166643B (en) | 2011-03-30 | 2011-03-30 | Method for preventing monocrystal blades from having mixed crystal defects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110077543 CN102166643B (en) | 2011-03-30 | 2011-03-30 | Method for preventing monocrystal blades from having mixed crystal defects |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102166643A true CN102166643A (en) | 2011-08-31 |
| CN102166643B CN102166643B (en) | 2013-07-24 |
Family
ID=44488068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110077543 Expired - Fee Related CN102166643B (en) | 2011-03-30 | 2011-03-30 | Method for preventing monocrystal blades from having mixed crystal defects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102166643B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP2801644A1 (en) * | 2013-05-08 | 2014-11-12 | General Electric Company | Composite geometrical design for a grain starter in a bridgmaninvestment casting process |
| CN104259442A (en) * | 2014-09-29 | 2015-01-07 | 江苏大学 | Method for preventing single crystal blade from generating miscellaneous 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 |
| CN104439077A (en) * | 2014-12-15 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Wax tree structure for forming high-temperature alloy single-crystal turbine blade |
| CN104661775A (en) * | 2012-09-25 | 2015-05-27 | 斯奈克玛 | Shell mould having a heat shield |
| CN104690256A (en) * | 2015-02-11 | 2015-06-10 | 西北工业大学 | Directional solidification method for controlling foreign crystal defects of nickel-base superalloy step cast |
| CN105108061A (en) * | 2015-09-30 | 2015-12-02 | 东方电气集团东方汽轮机有限公司 | Method of eliminating stray grain defect in single crystal blade |
| CN105436478A (en) * | 2015-12-30 | 2016-03-30 | 上海大学 | Method for controlling formation of foreign crystals at variable cross section |
| CN108097877A (en) * | 2017-11-02 | 2018-06-01 | 江苏大学 | A kind of method for being used to inhibit monocrystal blades from having mixed crystal defects formation |
| CN109604526A (en) * | 2019-01-17 | 2019-04-12 | 中国科学院金属研究所 | A method of preventing the formation of single crystal super alloy moving blade stray crystal defect |
| CN110083927A (en) * | 2019-04-24 | 2019-08-02 | 西安交通大学 | It is a kind of for controlling the integrated cast design method of single crystal blade listrium stray crystal |
| CN114130994A (en) * | 2021-12-20 | 2022-03-04 | 成都航宇超合金技术有限公司 | Device and method for reducing mixed crystal defects at platform of single crystal blade |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5161602A (en) * | 1991-07-22 | 1992-11-10 | National Science Council | Graphite mold for single crystal growth of active materials and a process for manufacturing the same |
| CN1137577A (en) * | 1995-06-07 | 1996-12-11 | 中国科学院金属研究所 | Technology for preparation of metal material single crystal |
| CN1150185A (en) * | 1995-11-14 | 1997-05-21 | 中国科学院金属研究所 | Technique for preparing monocrystal of metal material |
| CN1226291A (en) * | 1996-06-05 | 1999-08-18 | 通用电气公司 | Method and apparatus for making directional solidification castings |
| CN101537484A (en) * | 2009-03-17 | 2009-09-23 | 江苏大学 | Method for improving temperature distribution in process of single crystal casting solidification |
| EP2223755A1 (en) * | 2009-02-04 | 2010-09-01 | Rolls-Royce plc | Casting method |
| CN101934367A (en) * | 2010-09-07 | 2011-01-05 | 沈阳铸造研究所 | Thermal-insulation baffle plate for liquid metal cooling and oriented solidification casting equipment |
-
2011
- 2011-03-30 CN CN 201110077543 patent/CN102166643B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5161602A (en) * | 1991-07-22 | 1992-11-10 | National Science Council | Graphite mold for single crystal growth of active materials and a process for manufacturing the same |
| CN1137577A (en) * | 1995-06-07 | 1996-12-11 | 中国科学院金属研究所 | Technology for preparation of metal material single crystal |
| CN1150185A (en) * | 1995-11-14 | 1997-05-21 | 中国科学院金属研究所 | Technique for preparing monocrystal of metal material |
| CN1226291A (en) * | 1996-06-05 | 1999-08-18 | 通用电气公司 | Method and apparatus for making directional solidification castings |
| EP2223755A1 (en) * | 2009-02-04 | 2010-09-01 | Rolls-Royce plc | Casting method |
| CN101537484A (en) * | 2009-03-17 | 2009-09-23 | 江苏大学 | Method for improving temperature distribution in process of single crystal casting solidification |
| CN101934367A (en) * | 2010-09-07 | 2011-01-05 | 沈阳铸造研究所 | Thermal-insulation baffle plate for liquid metal cooling and oriented solidification casting equipment |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104661775A (en) * | 2012-09-25 | 2015-05-27 | 斯奈克玛 | Shell mould having a heat shield |
| US9643240B2 (en) | 2012-09-25 | 2017-05-09 | Snecma | Shell mould having a heat shield |
| CN104661775B (en) * | 2012-09-25 | 2017-03-08 | 斯奈克玛 | There is the housing mould of heat cover |
| CN103143678B (en) * | 2013-04-01 | 2015-02-18 | 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 |
| 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 |
| US9068275B2 (en) | 2013-05-08 | 2015-06-30 | General Electric Company | Composite geometrical design for a grain starter in a bridgman investment casting process |
| EP2801644A1 (en) * | 2013-05-08 | 2014-11-12 | General Electric Company | Composite geometrical design for a grain starter in a bridgmaninvestment casting process |
| CN104139175B (en) * | 2013-05-08 | 2017-09-15 | 通用电气公司 | Composite geometry designs for the crystal grain starter motor in BRIDGMAN investment casting process |
| CN104259442A (en) * | 2014-09-29 | 2015-01-07 | 江苏大学 | Method for preventing single crystal blade from generating miscellaneous 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 |
| CN104439077A (en) * | 2014-12-15 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Wax tree structure for forming high-temperature alloy single-crystal turbine blade |
| CN104690256A (en) * | 2015-02-11 | 2015-06-10 | 西北工业大学 | Directional solidification method for controlling foreign crystal defects of nickel-base superalloy step cast |
| CN105108061A (en) * | 2015-09-30 | 2015-12-02 | 东方电气集团东方汽轮机有限公司 | Method of eliminating stray grain defect in single crystal blade |
| CN105436478A (en) * | 2015-12-30 | 2016-03-30 | 上海大学 | Method for controlling formation of foreign crystals at variable cross section |
| CN108097877A (en) * | 2017-11-02 | 2018-06-01 | 江苏大学 | A kind of method for being used to inhibit monocrystal blades from having mixed crystal defects formation |
| CN109604526A (en) * | 2019-01-17 | 2019-04-12 | 中国科学院金属研究所 | A method of preventing the formation of single crystal super alloy moving blade stray crystal defect |
| CN110083927A (en) * | 2019-04-24 | 2019-08-02 | 西安交通大学 | It is a kind of for controlling the integrated cast design method of single crystal blade listrium stray crystal |
| CN114130994A (en) * | 2021-12-20 | 2022-03-04 | 成都航宇超合金技术有限公司 | Device and method for reducing mixed crystal defects at platform of single crystal blade |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102166643B (en) | 2013-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102166643B (en) | Method for preventing monocrystal blades from having mixed crystal defects | |
| CN107745093B (en) | Fine casting module and casting method for preparing nickel-based single crystal guide vane with precisely controllable crystal orientation by utilizing fine casting module | |
| CN103252448B (en) | A kind of thin-wall high-strength mold shell preparation method manufactured for single crystal blade | |
| CN101537484B (en) | Method for improving temperature distribution in process of single crystal casting solidification | |
| Ma | Novel casting processes for single-crystal turbine blades of superalloys | |
| CN100587133C (en) | Method for preparing Ni based single-crystal high-temperature alloy by employing seed crystal | |
| CN106563773B (en) | A kind of method that monocrystal blades from having mixed crystal defects is prevented based on laser heating technique | |
| CN109396400B (en) | Large complex thin-wall fine-grain casting integrated forming method and device | |
| CN109604526B (en) | Method for preventing formation of mixed crystal defects of single crystal high temperature alloy rotating blade | |
| US9144842B2 (en) | Unidirectional solidification process and apparatus and single-crystal seed therefor | |
| CN104259442A (en) | Method for preventing single crystal blade from generating miscellaneous crystal defect | |
| CN104947175A (en) | Method for preparing single crystal high temperature alloy block material through laser 3D printing | |
| CN103894547B (en) | With the casting method of listrium Blade roughcast | |
| CN105108061A (en) | Method of eliminating stray grain defect in single crystal blade | |
| CN103509973A (en) | Precisely cast blade and manufacturing method thereof | |
| CN111168004B (en) | Method for forming single crystal part by gel casting integrated casting based on spiral crystal selector with seed crystal block embedded structure | |
| CN111922322A (en) | Directional solidification device and casting method | |
| CN113458366A (en) | Antigravity effect single crystal high-temperature alloy directional solidification growth equipment and application thereof | |
| CN100587135C (en) | Method for preparing Ni3Al-based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method | |
| JP6401051B2 (en) | Method for producing polycrystalline silicon ingot | |
| CN109475931B (en) | Directional solidification cooling furnace and cooling method using the same | |
| CN112222362B (en) | Silicon-based ceramic core resistant to cold and hot impact, high-temperature creep and easy to remove and preparation process thereof | |
| CN104647586A (en) | Production method of composite ceramic core for single crystal hollow blade of complex structure | |
| CN102127816B (en) | Method for preparing Ni3A1-based rhenium-contained moncrystal alloy with liquid metal cooling method | |
| CN2629875Y (en) | silicon carbide section mould for directional solidification |
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 | ||
| 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: 20130724 Termination date: 20160330 |