CN103878372B - A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria - Google Patents
A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria Download PDFInfo
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- CN103878372B CN103878372B CN201310725870.0A CN201310725870A CN103878372B CN 103878372 B CN103878372 B CN 103878372B CN 201310725870 A CN201310725870 A CN 201310725870A CN 103878372 B CN103878372 B CN 103878372B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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Abstract
The invention provides a kind of method that manufacture has the metalwork of the geometry such as thin-walled or stria, by using two kinds of wax-based material alternate injection of different nature and segmentation to carve, it is achieved the wax-pattern of thin-wall construction and stria structure makes.When a kind of wax-based material is carried out Carving Machining, another kind of wax-based material plays a supportive role.If the thin-wall construction material that processing obtains is machinable wax, the wax-pattern of available thin-wall construction；If thin-wall construction material be can water-soluble wax, the wax-pattern of available stria structure.On this basis, apply gel casting process, the slurry of added metal powder is injected wax-pattern, make metalwork base substrate.Further, use vacuum freeze-drying method that base substrate is dried, solve the problem of Cracking that base substrate easily occurs in dry run.Finally, Microwave Sintering Techniques is applied to the sintering process to gel casting forming base substrate, the cracking easily occurred during solving blank sintering and buckling deformation problem.
Description
Technical field
The present invention relates to field of machining, particularly relate to the machining neck of thin-wall construction and stria structure
Territory.
Technical background
Thin-wall construction or the processing of stria structure are difficult points impassable in traditional mechanical processing.Increase material system
Make and open new technological approaches for solution problems.Stanford University proposes molten drop deposition and numerical control
Processing combines, i.e. shaped deposition manufacture (Shape Deposition Manufacturing, SDM),
It is manufactured that the silicon nitride of complicated shape, rustless steel turbine rotor.
Gel casting forming (Gelcasting) technology is U.S.'s Oak Ridge country nineties in 20th century
Laboratory (Oak Ridge National Laboratory) O.Omatete et al. proposes, it
It is addition organic monomer in the suspension of powder particle material, such as acrylamide, then adds one
Quantitative initiator promotes organic monomer to crosslink reaction thus reaches a kind of molding of in-situ solidifying
Technology.Gel injection-moulding has been successfully applied to the molding of multiple ceramic material, as aluminium oxide, zirconium oxide,
Carborundum, silicon nitride and composite thereof etc..In recent years, both at home and abroad some scholars by gel injection-moulding
Application expands to metal powder material.
In order to be beneficial to pour into a mould the minutia such as thin-wall part, stria, gel-casting slurry to have good rheological characteristic,
The i.e. apparent viscosity of slurry is the smaller the better.For metal dust, its viscosity number is not above 1Pa s.Gold
Belonging to slurry and require low viscosity, high solid loading, this is conflict.Therefore before ensureing good fluidity
Put the content as far as possible improving powder particle, particularly important for cast thin-wall part.Additionally, gel injection-moulding
Base substrate contains a certain amount of water, and along with the removal of moisture during body drying, base substrate produces and shrinks, if
Shrink uneven meeting and cause the defect such as blank deformation, cracking.Traditional drying means, is all that base substrate is put into
Vacuum drying oven, removes moisture removal by mode of heating.Thermograde is had owing to base substrate is inside and outside, outside
Moisture evaporation rate is far longer than inside, causes base substrate to shrink uneven, produces internal stress, affects base substrate strong
Degree, can affect follow-up sintering quality simultaneously, causes sintering cracking.
Summary of the invention
The main technical problem to be solved in the present invention is to provide the manufacture method of a kind of metalwork, it is achieved to tool
There is the quick manufacture of the metal pieces of the geometric detail feature such as thin-walled, stria.The secondary skill that the invention solves the problems that
Art problem is, solves the problem that metalwork exists sintering buckling deformation during conventional sintering.
In order to solve above-mentioned technical problem, the invention provides. it is several that a kind of manufacture has thin-walled or stria etc.
The method of the metalwork of what structure, it is characterised in that use wax-based material alternate injection and segmentation engraving with solidifying
The method that glue injection molding combines, mainly includes that two kinds of wax-based material alternate injection and segmentation engraving make wax-pattern, coagulate
Glue casting, sintering；
The two wax-based material alternate injection use injection increase material method, make wax material in banking process with
Semi-molten state penetrates；The two wax-based material is respectively machinable wax and water-soluble wax；
Described wax-based material alternate injection and segmentation engraving concretely comprise the following steps: use A wax as support, engraving
Process support die cavity, uses B wax addition type cavity material, engraving support die cavity and obtain the thin-walled using A wax
Support, use B wax to the support die cavity addition type cavity material after engraving；
When described A wax is water-soluble wax, by Soaking treatment, obtain the wax-pattern of stria structure；Described B wax
During for water-soluble wax, by Soaking treatment, obtain the wax-pattern of thin-wall construction.
As preferably, described sintering uses microwave sintering.
As preferably, described gel casting forming mainly include slurry prepare, body drying, the hot melt demoulding.
As preferably, time prepared by described slurry, use the metal powder that binding agent, dispersant and two kinds of thicknesses are different
End mixing match improves the solid concentration of slurry.
As preferably, described body drying uses vacuum lyophilization.
As preferably, described binding agent is gelatin.
As preferably, described dispersant is polyvinyl alcohol, sodium alginate, Triammonium citrate, dodecyl sulfur
Acid ammonium.
As preferably, the metal dust that the two thickness is different be meso-position radius be respectively 11.80 μm and
The water atomization 316L powder of stainless steel of 24.32 μm.
As preferably, the water atomization 316L that described meso-position radius is respectively 11.80 μm and 24.32 μm is stainless
The mixed proportion of powdered steel is 4:6.
As preferably, described vacuum lyophilization detailed process is: by cast base substrate and wax-pattern at-50 DEG C
Under conditions of freezing 4h, base substrate fully charge is become solid-state；Then it is placed on the shelf of freezer dryer and carries out
Sublimation drying, carries out evacuation simultaneously, and holding vacuum is about 10Pa, condenser temperature-50 DEG C, continues
Time 8h；Hot melt is used to remove wax-pattern after body drying: to be put into together with wax-pattern very by dried base substrate
In empty drying baker, being heated to 150 DEG C and keep 30 minutes, wax-pattern can be completely melt, finally obtains complete
Part blanks.
As preferably, the employing microwave frequency of described microwave sintering is 2.45GHz microwave high-vacuum stove.
As preferably, the turntable of described microwave high-vacuum stove is provided with high temperature bucket, is provided with in described high temperature bucket
Mullite crucible.
As preferably, between described high temperature bucket and mullite crucible, it is filled with zirconium oxide, carborundum and insulation
Cotton.
The invention provides a kind of method that manufacture has the metalwork of the geometry such as thin-walled or stria, pass through
Use two kinds of wax-based material alternate injection and segmentation engraving in the course of processing so that two kinds of wax-based material are mutual
Backing, thus realize the wax-pattern to having the geometric detail feature such as thin-walled, stria and make.Material is increased by injection
Method, be that wax material penetrates with semi-molten state in banking process, it is to avoid wax material is in type solid-state version
The hot melt on surface, chamber damages.By one of which wax material is used water miscible wax material, can be gone by water logging
Remove, conveniently, separate with cavity material cleanly.Use the metal dust proportioning mixing that two kinds of thicknesses are different,
On the premise of ensureing that slurry has good rheological performance, it is effectively increased the solid Density of slurry.Use true
The method of vacuum freecing-dry, base substrate shrinkage factor is low, mechanical property is high, and blank forming quality is good, it is possible to very well
Ground keeps blank shape, efficiently solves base substrate fracture, the defect of deformation in traditional drying.Use microwave burns
The mode of knot, can obtain higher consistency and good under relatively low sintering temperature and shorter temperature retention time
Good mechanical property, and solve well complex structural member sintering process exists asking of sintering buckling deformation
Topic.
Accompanying drawing explanation
Fig. 1 is that the present invention uses two kinds of wax-based material alternate injection and segmentation engraving to make the block diagram of wax-pattern,
Wherein:
A () uses water-soluble wax as support；(b) process support die cavity；(c) addition type cavity material；(d)
Alternately processing cavity；E () processing thin-walled supports；F () thin-walled supports and is formed；(g) addition type cavity material；
H () removes water-soluble wax.
Fig. 2 is that the base substrate using traditional drying to obtain uses vacuum lyophilization to obtain in the embodiment of the present invention
Base substrate comparison diagram, wherein:
A () is traditional drying, (b) is vacuum lyophilization.
Fig. 3 is that the present embodiment uses fine vacuum micro-wave oven furnace chamber schematic diagram.
Fig. 4 is that the metalwork using conventional sintering to obtain uses microwave sintering to obtain in the embodiment of the present invention
Metalwork comparison diagram, wherein:
A () is conventional sintering, (b) is microwave sintering.
Detailed description of the invention
Hereafter by combining drawings and Examples, the present invention is further elaborated.
1, two kinds of wax-based material alternate injection and segmentation engraving make wax-pattern.
With reference to Fig. 1, process, with removing, the process combined by material stacking, by selecting bi-material to exist
The effect of mutual backing in machining process, it is achieved to the part with the geometric detail feature such as thin-walled, stria
Quick manufacture.
By the method using injection to increase material, make the banking process of wax material be in semi-molten state injection, can keep away
Open the melting temperature of solid state wax, it is ensured that molded mold cavity surface is not melted damage by heat；By to machinable
Wax material makees suitable modification, it is ensured that its machinable performance；The material matched with machinable wax is water-soluble wax,
Can be removed by water logging, conveniently, separate with cavity material cleanly.
Described wax-based material alternate injection and segmentation engraving concretely comprise the following steps: use water-soluble wax as support, make
With water-soluble wax process support die cavity, machinable wax addition type cavity material, engraving is used to support die cavity and obtain
The thin-walled using water-soluble wax supports, and uses machinable wax to the support die cavity addition type cavity material after engraving.
The geometric detail feature such as thin-walled bead structures or stria structure can be obtained by the processing of alternately backing.As
The thin-walled relying on backing material to process is machinable wax, the wax-pattern of available thin-wall construction after water logging；As
The thin-walled processed be can water-soluble wax, the wax-pattern of available stria structure after water logging.Either processing can add by machine
Work wax or water-soluble wax, be all to carry out under the backing of another kind of wax.
2, gel casting forming.
(1) prepared by slurry
Use natural, nontoxic gel rubber system.Using gelatin as binding agent, select polyvinyl alcohol, alginic acid
Sodium, Triammonium citrate, ammonium lauryl sulfate, as dispersant, regulate pH value with NaOH and HCl solution.
Meso-position radius is used to be respectively the water atomization 316L rustless steel that two kinds of thicknesses of 11.80 μm and 24.32 μm are different
Powder, compares grating with different quality.
In the present embodiment, when meso-position radius, to be respectively the water atomization 316L of 11.80 μm and 24.32 μm stainless
When the mixed proportion of powdered steel is 4:6, slurry viscosity is minimum, has the highest solid concentration, base simultaneously
The maximum intensity of body, shrinkage factor is the most minimum.
By the low viscosity prepared, the 316L rustless steel slurry of high solid loading, it is poured in wax-pattern.
(2) body drying
The base substrate of cast is put into freezer dryer together with wax-pattern and carries out lyophilization.Concrete drying process
For: first freezing 4h under conditions of-50 DEG C, base substrate fully charge is become solid-state.Then it is placed on freezing dry
Carrying out sublimation drying on the shelf of dry machine, carry out evacuation simultaneously, holding vacuum is about 10Pa, cold
Trap temperature-50 DEG C, this phase duration is 8h.
Hot melt is used to remove wax-pattern after body drying.Dried base substrate is put into together with wax-pattern vacuum do
In dry case, being heated to 150 DEG C and keep 30 minutes, wax-pattern can be completely melt, finally obtains complete zero
Part base substrate.
With reference to Fig. 2, hygrometric state base substrate is after vacuum lyophilization, and drying shrinkage is substantially reduced.Use tradition
Box-type drying method, body drying shrinkage factor reaches 3.5%, and Fig. 2 is the base substrate and this using traditional drying to obtain
Using the base substrate comparison diagram that vacuum lyophilization obtains in inventive embodiments, a figure in Fig. 2 is traditional drying
Blank cracking occur, for vacuum lyophilization, and after vacuum lyophilization, the shrinkage factor of base substrate is only 0.44%,
Can be good at keeping blank structure and form, as shown in Fig. 2 (b).During vacuum lyophilization, base
Moisture in body, directly by solid state sublimation, eliminates solid, liquid surface tension present in common being dried, thus
Efficiently solve base substrate fracture, the defect of deformation in traditional drying.
3, microwave sintering
Using HAMiLab-HV3 type microwave high-vacuum experimental furnace, microwave frequency is 2.45GHz.As it is shown on figure 3,
Using infrared radiation thermometer to carry out thermometric, during work, work stage slowly rotates, with micro-on base substrate of guarantee effect
Wave field is evenly distributed, and uses circular heat-preserving container to put on a spinstand, and base substrate is placed on special mullite crucible
In, it is filled with zirconium oxide, carborundum and heat-preservation cotton between high temperature bucket and crucible, plays auxiliary heating and insulation effect.
Because the absorbing property of ceramic material is good, in the sintering incipient stage, contribute to being brought rapidly up.Meanwhile, burning
The final stage of knot, powder particle is bound up, metal body gradually densification, and microwave reflection becomes big,
Absorbing microwave ability to decline, be converted into heat energy and tail off, this stage is mainly by assisting the insulation of heating material
Effect heating.A figure in Fig. 4 is the situation that warpage occurs in conventional sintering test specimen.
Use the mode of microwave sintering, can obtain relatively under relatively low sintering temperature and shorter temperature retention time
High consistency and good mechanical property, and solve existence burning in complex structural member sintering process well
The problem of knot buckling deformation.As shown in (b) in Fig. 4.
In sum, the invention provides a kind of manufacture and there is the metalwork of the geometry such as thin-walled or stria
Method possesses following advantage:
(1) wax-based material alternate injection and segmentation engraving being combined with gel injection-moulding, it is right to realize well
In having the part manufacture of the geometric detail feature such as thin-walled, stria, for complicated and there is geometric detail structure
The integration of the metalwork of feature quickly manufactures has obvious advantage.
(2) with 316L powder of stainless steel as raw material, natural free of contamination gel rubber system is used, with 1% (phase
To metal dust mass fraction) gelatin is binding agent, the sodium alginate of 0.8%, as dispersant, selects thickness
Two kinds of different powder of stainless steel can ensure that have higher solid concentration by rational grain composition
Under, slurry possesses the mechanical property of good rheological property and molding blank.
(3) vacuum lyophilization is compared with conventional drying process, and base substrate shrinkage factor is low, mechanical property is high, base
Body formed quality is good, it is possible to keep blank shape well, efficiently solve in traditional drying base substrate fracture,
The defects such as deformation.
(4) microwave sintering is contrasted with conventional sintering mode, can be relatively low sintering temperature and shorter guarantor
Obtain higher consistency and good mechanical property under temperature time conditions, and solve labyrinth well
The problems such as buckling deformation are sintered present in part sintering process.
Above example is only used by the explanation principle of the invention, and the only embodiment of non-invention.Above-mentioned
Embodiment should not be considered as limiting the scope of the present invention.Those skilled in the art read and understand aforementioned
While detailed description, can modify and change.Concrete protection domain should be as the criterion with claims.
Claims (13)
1. a manufacture has the method for metalwork of thin-walled or stria geometry, it is characterised in that
The method using wax-based material alternate injection and segmentation engraving to be combined with gel injection-moulding, mainly includes two kinds
Wax-based material alternate injection and segmentation engraving make wax-pattern, gel casting forming, sintering；
The two wax-based material alternate injection uses the method that injection increases material, makes wax material in banking process
In with semi-molten state penetrate；The two wax-based material is respectively machinable wax and water-soluble wax；
Described wax-based material alternate injection and segmentation engraving concretely comprise the following steps: use A wax as support,
Carving Machining supports die cavity, uses B wax addition type cavity material, engraving support die cavity and obtain use A
The thin-walled of wax supports, and uses B wax to the support die cavity addition type cavity material after engraving；
Described A wax is water-soluble wax, when B wax is machinable wax, by Soaking treatment, has obtained thin
The wax-pattern of groove structure；Described A wax is machinable wax, when B wax is water-soluble wax, by Soaking treatment,
Obtain the wax-pattern of thin-wall construction.
A kind of manufacture the most according to claim 1 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described sintering uses microwave sintering.
A kind of manufacture the most according to claim 1 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described gel casting forming mainly include slurry prepare, body drying,
The hot melt demoulding.
A kind of manufacture the most according to claim 3 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that use binding agent, dispersant and two kinds of thicknesses time prepared by described slurry
Different metal dust mixing match improves the solid concentration of slurry.
A kind of manufacture the most according to claim 3 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described body drying uses vacuum lyophilization.
A kind of manufacture the most according to claim 4 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described binding agent is gelatin.
A kind of manufacture the most according to claim 4 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described dispersant is polyvinyl alcohol, sodium alginate, Triammonium citrate,
The one of ammonium lauryl sulfate.
A kind of manufacture the most according to claim 4 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that the metal dust that the two thickness is different is that meso-position radius is respectively
The water atomization 316L powder of stainless steel of 11.80 μm and 24.32 μm.
A kind of manufacture the most according to claim 8 has thin-walled or the metal of stria geometry
The method of part, it is characterised in that described meso-position radius is respectively 11.80 μm and the water smoke of 24.32 μm
The mixed proportion changing 316L powder of stainless steel is 4:6.
A kind of manufacture the most according to claim 5 has thin-walled or the gold of stria geometry
The method belonging to part, it is characterised in that described vacuum lyophilization detailed process is: by the base substrate of cast
With wax-pattern freezing 4h under conditions of-50 DEG C, base substrate fully charge is become solid-state；Then freezing it is placed on
Carrying out sublimation drying on the shelf of drying machine, carry out evacuation simultaneously, holding vacuum is 10Pa,
Condenser temperature-50 DEG C, persistent period 8h；Hot melt is used to remove wax-pattern after body drying: will be dried
After base substrate put into vacuum drying oven together with wax-pattern, be heated to 150 DEG C and keep 30 minutes,
Wax-pattern can be completely melt, finally obtains complete part blanks.
11. a kind of manufactures according to claim 2 have thin-walled or the gold of stria geometry
The method belonging to part, it is characterised in that described microwave sintering uses microwave frequency to be the microwave of 2.45GHz
High vacuum furnace is carried out.
12. a kind of manufactures according to claim 11 have thin-walled or the gold of stria geometry
The method belonging to part, it is characterised in that the turntable of described microwave high-vacuum stove is provided with high temperature bucket, institute
It is provided with mullite crucible in stating high temperature bucket.
13. a kind of manufactures according to claim 12 have thin-walled or the gold of stria geometry
Belong to part method, it is characterised in that be filled with between described high temperature bucket and mullite crucible zirconium oxide,
Carborundum and heat-preservation cotton.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310725870.0A CN103878372B (en) | 2013-12-25 | 2013-12-25 | A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria |
| PCT/CN2014/094578 WO2015096685A1 (en) | 2013-12-25 | 2014-12-23 | Method for manufacturing metal member having geometric structure such as thin wall or thin groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310725870.0A CN103878372B (en) | 2013-12-25 | 2013-12-25 | A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria |
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| CN103878372A CN103878372A (en) | 2014-06-25 |
| CN103878372B true CN103878372B (en) | 2016-08-17 |
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| CN103878372B (en) * | 2013-12-25 | 2016-08-17 | 华侨大学 | A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria |
| CN105750551A (en) * | 2016-04-07 | 2016-07-13 | 惠州威博精密科技有限公司 | Method for manufacturing pulley sheets of headphones |
| CN109834266A (en) * | 2019-01-24 | 2019-06-04 | 北京工业大学 | A kind of method that microwave sintering prepares immersion-type scandium-containing diffusion cathode |
| CN110434277A (en) * | 2019-09-11 | 2019-11-12 | 武汉工控艺术制造有限公司 | Improve ceramic mould precision investment surface smoothness, the method for precision and service life |
| CN110577822B (en) * | 2019-09-26 | 2022-05-06 | 北京环境特性研究所 | High-temperature-resistant broadband wave-absorbing material with gradually-changed dielectric gradient and preparation method thereof |
| CN111136275A (en) * | 2020-01-20 | 2020-05-12 | 江苏精研科技股份有限公司 | Method for preparing large-area thin-wall part by injection molding |
| CN114110350A (en) * | 2021-12-02 | 2022-03-01 | 浙江天铂云科光电股份有限公司 | Intelligent recognition device based on temperature vision |
| CN114406196B (en) * | 2021-12-31 | 2023-12-15 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN114425598B (en) * | 2021-12-31 | 2023-10-27 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped slit holes |
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| US5824250A (en) * | 1996-06-28 | 1998-10-20 | Alliedsignal Inc. | Gel cast molding with fugitive molds |
| US6375880B1 (en) * | 1997-09-30 | 2002-04-23 | The Board Of Trustees Of The Leland Stanford Junior University | Mold shape deposition manufacturing |
| US6242163B1 (en) * | 1998-08-31 | 2001-06-05 | Board Of Trustees Of The Leland Stanford Junior University | Shape deposition manufacturing of microscopic ceramic and metallic parts using silicon molds |
| GB2417921A (en) * | 2004-09-10 | 2006-03-15 | Dytech Corp Ltd | A method of fabricating a catalyst carrier |
| CN100408512C (en) * | 2006-12-06 | 2008-08-06 | 中国科学院上海硅酸盐研究所 | Method for preparing alumina porous ceramic using gelatin wrapping-freeze drying process |
| CN100999123A (en) * | 2006-12-31 | 2007-07-18 | 华侨大学 | Stage injection/carving composite fast shaping technology |
| CN101397210B (en) * | 2007-09-24 | 2011-08-17 | 深圳市金科特种材料股份有限公司 | Gel-casting moulding technique for preparing silicon nitride ceramics heating element |
| CN101456075B (en) * | 2007-12-14 | 2010-11-24 | 比亚迪股份有限公司 | Preparation method of nano-crystal soft magnetic alloy elements |
| CN101520287A (en) * | 2009-03-31 | 2009-09-02 | 北京科技大学 | Method for preparing radiator element with complicated shape |
| CN102875150B (en) * | 2012-10-16 | 2014-03-26 | 北京科技大学 | Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering |
| CN103113112B (en) * | 2013-02-04 | 2014-06-04 | 西安交通大学 | Preparation method of metal toughened ceramic-based composite material turbine blade |
| CN103360079B (en) * | 2013-07-10 | 2015-04-29 | 西安交通大学 | Method for customizing core and shell of integrated ceramic mold of hollow turbine blade |
| CN103878372B (en) * | 2013-12-25 | 2016-08-17 | 华侨大学 | A kind of manufacture has the method for the metalwork of the geometry such as thin-walled or stria |
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| WO2015096685A1 (en) | 2015-07-02 |
| CN103878372A (en) | 2014-06-25 |
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