CN105834361B - A kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork - Google Patents
A kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork Download PDFInfo
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- CN105834361B CN105834361B CN201610203532.4A CN201610203532A CN105834361B CN 105834361 B CN105834361 B CN 105834361B CN 201610203532 A CN201610203532 A CN 201610203532A CN 105834361 B CN105834361 B CN 105834361B
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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
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Abstract
The present invention relates to high-temperature alloy vacuum stove hot investment casting fields, and in particular to a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork.This formwork is compound shell mould, including face layer and the backing layer by adding the modification of odd-shaped cross section chopped carbon fiber.Its making step includes：Surface layer slurry and backing layer slurry are prepared respectively；Finely dispersed chopped carbon fiber in advance is added in backing layer slurry；It uses surface layer slurry, backing layer slurry to face layer, backing layer hanging respectively, drenches sand；The above hanging, leaching sand operation are repeated, until predetermined number of layers；With surface layer slurry slurry seal, formwork dewaxing；Furnace cooling after roasting.Formwork fiber obtained by the present invention is uniformly dispersed and the failure that is not drawn out easily, and increases form strength, reduces formwork thickness, enhance the heat dissipation performance of formwork, realize the performance requirement of thin-wall high-strength, improves single crystal blade yield rate.
Description
Technical field
The present invention relates to high-temperature alloy vacuum stove hot investment casting fields, and in particular to a kind of odd-shaped cross section chopped carbon fiber changes
The preparation method of property ceramic shell mould.
Background technology
High temperature alloy column crystal/single crystal organization is prepared by directional solidification technique, is aero engine turbine blades and combustion
Key technology in blade of gas turbine manufacture；In order to obtain good high-temperature alloy blades, it is desirable that ceramic shell has enough strong
Degree and excellent heat dissipation performance, common formwork Enhancement Method is the increase formwork number of plies in production, but the method obviously with orientation
The technology for improving temperature gradient in solidifying process by reducing formwork thickness requires to run counter to.
The axial strength and modulus of carbon fiber are high, and specific heat between nonmetallic between metal, stablize by performance, is suitble to be answered
It is prepared for formwork to improve intensity and heat dissipation performance；Chinese patent literature CN103252448A describes " a kind of for single
The thin-wall high-strength mold shell preparation method of brilliant vane manufacturing ", this method are using the formwork after the cladding roasting of continuous carbon fibre cloth
To increase intensity, although the method has certain enhancing effect, but can only strengthen the heat-sinking capability on formwork surface, can not solve thickness
The huge thermal resistance problem of formwork itself, in addition, the method has the shortcomings that complex process, carbon cloth are of high cost.
Chinese patent literature CN103192062A describes " a kind of formwork for the manufacture of high temperature alloy single crystal blade ",
The backing layer of the formwork is directly made using the powder of good conductor the material such as silicon carbide or graphite of heat as floor sand, this formwork is led
Thermal energy power greatly improves, but its backing layer intensity declines apparent, roasting technique complexity oxidizable additionally, due to graphite.
Invention content
Problem to be solved by this invention is that one kind is simple for process, the period is short, intensity in view of the shortcomings of the prior art, providing
Formwork preparation method high, thermal diffusivity is good.
To achieve the above object, the technical solution that the present invention takes is as follows：
(1) the backing layer slurry containing the Irregular Section Carbon Fiber that is chopped is prepared：First, by commercially available chopped Irregular Section Carbon Fiber
It is put into Ludox and soaks, so that it is uniformly dispersed in Ludox with inclined paddle type agitator stirring；Secondly, with L-type slurry bucket system
The Ludox of mixing odd-shaped cross section chopped carbon fiber, is then poured into backing layer size barrel, continuously stirring makes fiber by standby backing layer slurry
It is uniformly dispersed, to the backing layer slurry containing the Irregular Section Carbon Fiber that is chopped.
The mass ratio of the commercially available chopped Irregular Section Carbon Fiber and Ludox is 1：20.
In the backing layer slurry, the mass ratio of refractory powder and Ludox keeps 2:1~3:Between 1.
(2) surface layer slurry is prepared, refractory powder and Ludox mass ratio 3 in surface layer slurry:1.
(3) face layer, transition zone hanging, leaching sand：It is 35~45 seconds by surface layer slurry viscosity-adjusting agent, assembled cleaning is dry
Wax-pattern after dry immerses in bucket vertically, and after allowing slurry fully and uniformly moistening module, taking-up slowly turns to no piling, drop
It when falling phenomenon, is gently brushed with hair-dryer, to remove bubble and slurry is made to be coated with uniformly；Leaching sand is carried out after hanging, is turned repeatedly
Dynamic wax-pattern, makes sand be uniformly distributed, blows floating sand, before next hanging, blows floating sand, transition zone hanging, the leaching coplanar layer of sand.
The layer of face described in step (3) is 2 layers, and transition zone is 1 layer.
(4) backing layer hanging, leaching sand：With the backing layer slurry containing the Irregular Section Carbon Fiber that is chopped prepared in step (1) into
Backing layer slurry viscosity containing chopped Irregular Section Carbon Fiber is adjusted to 20~30 seconds by row hanging, and wax-pattern is immersed in bucket, is allowed
Slurry fully and after uniformly moistening module, with hair-dryer gently blown when slowly turning to no piling, drip phenomenon by taking-up
It strokes, to remove bubble and slurry is made to be coated with uniformly；Leaching sand is carried out after hanging, wax-pattern is rotated repeatedly, sand is made to be uniformly distributed, blow
Floating sand, before next hanging, blows floating sand.
(5) step (5) is repeated until predetermined number of layers.
(6) slurry seal, dewaxing, roasting.
Be chopped Irregular Section Carbon Fiber in step (1), the length of 2~6 millimeters, and monofilament cross-sectional shape is not rounded different
The amount of shape, such as " ten " or Y-shaped, preferably Y-shaped, addition is every liter of 2 grams~10 grams of backing layer slurry.
Slurry viscosity is adjusted to range of viscosities is required with mixing conditioning agent before each hanging of slurry in step (3), (4), is adjusted
Agent is saved as the mixture of Ludox and deionized water, glue, water volume ratio ratio are 3 in mixture:1, viscosity measurement tool is national standard
Zhan Shi glasss.
In step (3), the mass ratio of different grain size sand used is 100 mesh of fineness of sand when face layer drenches sand：80 mesh：60 mesh=
4：3：1, the mass ratio of different grain size sand used is 60 mesh of granularity when transition zone drenches sand：54 mesh=4:3.
The mass ratio of different grain size sand used is 60 mesh of granularity when backing layer leaching sand when leaching sand in step (4)：46 mesh：36 mesh
=1:5:2.
Slurry seal uses surface layer slurry in step (6), formwork dewaxing temperature is 150~160 DEG C, dewaxing pressure be 0.7~
0.8MPa, dewaxing 15~20min of time, dewaxing postcooling 30~40 minutes, formwork calcination temperature are 1000~1200 DEG C, time
It is 1 hour, furnace body power supply is closed after roasting and cools to room temperature with the furnace, takes out formwork.
Due to using technical solution as described above, the present invention to generate following good effect：
The present invention forms composite material by adding odd-shaped cross section chopped carbon fiber in corundum/Ludox formwork, not only
Reduce formwork thickness, increases wet strength, the elevated temperature strength of formwork, and due to adding the different of excellent thermal conductivity in formwork
Tee section chopped carbon fiber improves the heat dissipation performance of formwork, real conducive to big temperature gradient is formed in casting solidification process
The performance requirement of formwork thin-wall high-strength is showed.
Present invention uses the chopped carbon fibers of profiled cross-section, traditional circular cross-section carbon fiber are compared, in formwork
Middle combination is more secured, and resistance to plucking output capacity is stronger, and formwork enhancing effect is more preferable, and chopped carbon fiber used, in building trade
It is widely used, it is at low cost, it easily buys, the method is also applied for other hot investment casting shell moulds.
The present invention is improved on the basis of formwork original production technology, small to formwork original technological process change, and
Formwork obtained by the present invention, under the premise of can guarantee intensity reducing formwork is coated with the number of plies, saves time and shell material
Material, reduces cost, improves efficiency.
Using two size barrels, backing layer is separated with surface layer slurry, and there are two benefits, first backing layer, and carbon fiber is added and increases for this
Intensity and heat dissipation, cast(ing) surface precision can be ensured by being not added with carbon fiber in surface layer slurry, and secondly backing layer, surface layer slurry separately omit
From face layer to adjusting viscosity on a large scale when backing layer hanging, be conducive to the stabilization of slurry, reduce the working time；Odd-shaped cross section carbon
The resistance of spike protein gene, further improves form strength in fiber reinforcement formwork failure procedure；Chopped carbon fiber pre-wets
It ensure that fiber is uniformly dispersed in backing layer slurry.
Description of the drawings
Fig. 1 is a kind of production method flow chart of odd-shaped cross section chopped carbon fiber modified ceramic formwork.
Fig. 2 is odd-shaped cross section chopped carbon fiber modified ceramic formwork pictorial diagram.
Fig. 3 is the profile scanning figure of odd-shaped cross section chopped carbon fiber modified ceramic formwork；Region form matrix is indicated in figure
Local brittle fracture occurs for stand under load, and due to the presence of odd-shaped cross section chopped carbon fiber reinforcement, breaking portion is without departing from matrix.
Specific implementation mode
With the embodiment provided, the present invention is described in further detail below, with the understanding present invention's of complete and accurate
Feature.
It is the specific embodiment that inventor provides below.
A kind of production method of odd-shaped cross section chopped carbon fiber modified ceramic formwork of the present invention, includes the following steps：
(1) two barrels of slurries of A, B are prepared, wherein A barrels is face layer and transition zone slurry, and B barrels are backing layer slurry, and A barrels of slurries are rigid
Beautiful powder is 3 with Ludox mass ratio：1, wherein 320 mesh of schmigel；B barrels of slurry schmigels are 2 with Ludox mass ratio：1, wherein
320 mesh of schmigel and 200 mesh mass ratioes are 4:1.
(2) A, B slurry bucket (L-type) are opened, Ludox is poured into, adds wetting agent, the antifoaming agent of Ludox quality 0.1% respectively,
Then schmigel is uniformly sprinkled into slurry bucket by stirring 10 minutes, each addition is not more than 5 kilograms, per minor tick 2 hours or more.
(3) it after A, B barrels of slurry schmigel additions, continuously stirs 5 hours, it is molten with silicon before A, B barrels of each hangings of slurry
Glue and the mixture of deionized water adjust slurry viscosity to requiring viscosity number, glue, water volume ratio 3 in mixture:1, viscosity is surveyed
Amount tool is Zhan Shi glasss of national standard.
(4) Ludox of 20 times of weight of Y-shaped odd-shaped cross section chopped carbon fiber is soaked, carbon fiber addition is every liter
2 grams of backing layer slurry is stirred 15 minutes with mechanical agitator, so that it is uniformly dispersed in Ludox, then mixing odd-shaped cross section
The Ludox of chopped carbon fiber pours into B barrels, continuously stirs 5 hours.
(5) face layer, transition zone hanging：A barrels of slurry viscosities are adjusted to 40 seconds, by assembled wax-pattern (it is required that thoroughly clear
Clean drying) it immerses in A barrels vertically, after allowing slurry fully and uniformly moistening module, taking-up slowly turns to no piling, drippage
It when phenomenon, is gently brushed with hair-dryer, to remove bubble and slurry is made to be coated with uniformly.
(6) sand is drenched：Leaching sand is carried out after hanging, wax-pattern is rotated repeatedly, sand is made to be uniformly distributed, blow floating sand, next hanging
Before, floating sand is blown, face layer hanging sand is 2 layers, and transition zone is 1 layer, and face 100 mesh of layer fineness of sand, 80 mesh, 60 mesh mass ratioes are 4：3：1,
60 mesh of transition zone fineness of sand, 54 mesh mass ratioes are 4:3.
(7) backing layer hanging：B barrels of slurry viscosities are adjusted to 25 seconds, wax-pattern is immersed in B barrels, make slurry fully and uniform
After moistening module, when taking-up slowly turns to no piling, drip phenomenon, gently brushed with hair-dryer, to remove bubble simultaneously
Slurry is set to be coated with uniformly.
(8) the backing layer leaching same step of sand (6), 60 mesh of backing layer fineness of sand, 46 mesh, 36 mesh mass ratioes are 1:5:2,3 layers of hanging sand.
(9) formwork drying 6 hours after hanging, leaching sand operate every time.
(10) slurry seal：Wax-pattern is immersed in slurry bucket, is fully infiltrated, is taken out, it is 12 hours dry.
(11) formwork dewaxes：Formwork is put into dewaxing kettle, set dewaxing temperature as 160 DEG C, dewaxing pressure be 0.75MPa,
Dewax time 15min, dewaxing postcooling 30 minutes.
(12) formwork roasts：Formwork is put into box roaster, calcination temperature is 1200 DEG C, the time is 1 hour, after roasting
It closes furnace body power supply and cools to room temperature with the furnace, take out formwork；
(13) the sheet formwork sample made according to process above, its 3 points of curved intensity are tested using molding sand analyzer, wet
Intensity is 2.7MPa, corresponding that the sample wet strength of fibre reinforced is not added to be 1.4MPa, and circular cross-section carbon fiber is added
Sample wet strength is 2.4MPa.
Sintering strength is 4.9MPa, corresponding that the sample sintering strength of fibre reinforced is not added to be 2.3MPa, and circle is added
The sample sintering strength of tee section carbon fiber is 4.7MPa, and enhancing effect is apparent；Its thermal resistance is measured, than not plus under carbon fiber sample
Drop about 15%, heat dissipation performance also has improvement.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork, formwork be compound shell mould, including face layer with
And the backing layer being modified by adding odd-shaped cross section chopped carbon fiber, it is characterised in that be as follows：
(1) surface layer slurry and backing layer slurry are prepared respectively；
(2) the uniform odd-shaped cross section chopped carbon fiber of advance wetting and dispersing is added in backing layer slurry；
(3) slurry adjusts slurry viscosity using preceding with mixing conditioning agent every time；
(4) sand is drenched to face layer, transition zone hanging with surface layer slurry, gives backing layer hanging with backing layer slurry, drenches floor sand；
(5) the above hanging, leaching sand operation, until predetermined number of layers are repeated；
(6) surface layer slurry slurry seal, dry, dewaxing, roasting are used；
The uniform odd-shaped cross section chopped carbon fiber of advance wetting and dispersing is added in backing layer slurry to refer to：First, commercially available abnormity is cut
Face chopped carbon fiber, which is put into Ludox, to be soaked, and so that it is uniformly dispersed in Ludox with inclined paddle type agitator stirring；Secondly, it uses
L-type slurry bucket prepares backing layer slurry, the Ludox of mixing odd-shaped cross section chopped carbon fiber is then poured into backing layer size barrel, continuously
Stirring makes fiber be uniformly dispersed, and obtains the backing layer slurry containing odd-shaped cross section chopped carbon fiber；The commercially available odd-shaped cross section is chopped
The mass ratio of carbon fiber and Ludox is 1：20, in the backing layer slurry, the mass ratio of refractory powder and Ludox keeps 2:1~
3:Between 1；The odd-shaped cross section chopped carbon fiber, the length of 2~6 millimeters, monofilament cross-sectional shape is not rounded abnormity, is added
The amount entered is every liter of 2 grams~10 grams of backing layer slurry；The monofilament cross-sectional shape of the odd-shaped cross section chopped carbon fiber is Y-shaped.
2. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork as described in claim 1, feature exist
In：Formwork drying 6 hours after each hanging, leaching sand operation；With drying 12 hours after surface layer slurry slurry seal.
3. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork as described in claim 1, feature exist
In with surface layer slurry, to face layer, transition zone hanging, leaching sand refers to：It is 35~45 seconds by surface layer slurry viscosity-adjusting agent, it will be assembled
Wax-pattern after cleaning is dry immerses in bucket vertically, and after allowing slurry fully and uniformly moistening module, taking-up slowly turns to no slurry
When accumulation, drip phenomenon, gently brushed with hair-dryer, to remove bubble and slurry is made to be coated with uniformly；Leaching sand is carried out after hanging,
Wax-pattern is rotated repeatedly, sand is made to be uniformly distributed, blows floating sand, before next hanging, blows floating sand, transition zone hanging, the leaching coplanar layer of sand；
The face layer is 2 layers, and transition zone is 1 layer；The mass ratio of different grain size sand used is 100 mesh of fineness of sand when the layer leaching sand of face：80
Mesh：60 mesh=4：3：1, the mass ratio of different grain size sand used is 60 mesh of granularity when transition zone drenches sand：54 mesh=4:3.
4. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork as described in claim 1, feature exist
In giving backing layer hanging with backing layer slurry, drenches floor sand and refer to：It is carried out with the backing layer slurry containing odd-shaped cross section chopped carbon fiber of preparation
Backing layer slurry viscosity containing odd-shaped cross section chopped carbon fiber is adjusted to 20~30 seconds by hanging, and wax-pattern is immersed in bucket, allows slurry
Material when taking-up slowly turns to the accumulation of no slurry, drip phenomenon, is gently brushed fully and after uniformly moistening module with hair-dryer,
To remove bubble and slurry made to be coated with uniformly；Leaching sand is carried out after hanging, wax-pattern is rotated repeatedly, sand is made to be uniformly distributed, blow floating
Sand before next hanging, blows floating sand；The mass ratio of different grain size sand used is 60 mesh of granularity when backing layer drenches sand：46 mesh：36 mesh
=1:5:2.
5. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork as described in claim 1, feature exist
In：Adjust slurry viscosity to requiring range of viscosities with mixing conditioning agent before each hanging of slurry, conditioning agent be Ludox and go from
The mixture of sub- water, glue, water volume ratio 3 in mixture:1, viscosity measurement tool is Zhan Shi glasss of national standard.
6. a kind of preparation method of odd-shaped cross section chopped carbon fiber modified ceramic formwork as described in claim 1, feature exist
In：Slurry seal uses surface layer slurry in step (6), formwork dewaxing temperature is 150~160 DEG C, dewaxing pressure be 0.7~0.8MPa,
Dewax 15~20min of time, and dewaxing postcooling 30~40 minutes, formwork calcination temperature is 1000~1200 DEG C, the time is 1 small
When, furnace body power supply is closed after roasting and cools to room temperature with the furnace, takes out formwork.
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| CN106518027A (en) * | 2016-10-11 | 2017-03-22 | 江苏大学 | Preparation method of shell synchronously modified by mineralizing agent and chopped carbon fibers |
| CN108543911A (en) * | 2018-05-24 | 2018-09-18 | 东营嘉扬精密金属有限公司 | Pure white sand improves investment casting formwork collapsibility technique |
| 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 |
| CN108838333A (en) * | 2018-06-19 | 2018-11-20 | 霍山县忠福机电科技有限公司 | A kind of Improving Shell Making with Silica Sol |
| CN109128037A (en) * | 2018-07-20 | 2019-01-04 | 江苏大学 | A kind of composite modified ceramic shell and preparation method thereof |
| CN110814287A (en) * | 2019-10-22 | 2020-02-21 | 东风精密铸造安徽有限公司 | Shell manufacturing method for composite precision casting silica sol shell |
| CN114682729B (en) * | 2020-11-03 | 2023-10-20 | 福建省亿达精密铸造有限公司 | Preparation method of silica sol shell of precision casting |
| CN112276008B (en) * | 2020-11-05 | 2022-01-04 | 山东瑞泰新材料科技有限公司 | Manufacturing method of formwork for double-layer reversible turbine blade |
| CN112676535B (en) * | 2020-12-07 | 2021-09-07 | 中国科学院金属研究所 | Preparation method of ceramic shell for single crystal high-temperature alloy blade |
| CN113385640B (en) * | 2021-04-29 | 2022-11-11 | 洛阳双瑞精铸钛业有限公司 | Preparation method of reinforcing layer shell for casting thick-wall medium and small titanium alloy |
| 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 |
| 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 |
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| US6364000B2 (en) * | 1997-09-23 | 2002-04-02 | Howmet Research Corporation | Reinforced ceramic shell mold and method of making same |
| US7004230B2 (en) * | 2000-11-10 | 2006-02-28 | Buntrock Industries, Inc. | Investment casting shells and compositions including rice hull ash |
| CN102527937A (en) * | 2012-03-15 | 2012-07-04 | 哈尔滨工业大学 | Method for preparing fiber-reinforced thin-wall shell for casting titanium alloy smelting mold |
| CN203737936U (en) * | 2014-03-15 | 2014-07-30 | 内蒙古工业大学 | Fiber-reinforced investment casting composite shell |
| CN104399885B (en) * | 2014-10-28 | 2017-01-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for increasing permeability of investment cast ceramic shell |
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