CN109940152A - A kind of high temperature alloy antigravity casting stalk and its manufacturing method - Google Patents
A kind of high temperature alloy antigravity casting stalk and its manufacturing method Download PDFInfo
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Abstract
A kind of high temperature alloy antigravity casting stalk is had the refractory metal pipe of bulge-structure, rosette, inside and outside ceramic liner and inside and outside coating composition by inside and outside wall.Wherein, metal tube material is heat resisting steel, and the binding force of metal tube and ceramic liner can be improved in the bulge-structure that internal and external walls have.Inside and outside ceramic liner is made of 30-40wt% refractory powder, 50-60wt% refractory aggregate, 5-10wt% refractory fibre, thickness 15-25mm, is had and the close linear expansion coefficient of metal tube.Inside and outside coating is by 75-90wt% high-purity yttrium oxide powder, 8-23wt% acetic acid zirconium, 0.5-1wt% fatty alcohol polyoxy ether, and coating application made of 0.3-1.2wt% n-octyl alcohol forms, thickness 0.2-0.5mm.The advantages that stalk produced by the present invention has high temperature resistant, does not react with aluminium alloy, and thermal stability is good is also suitble to the antigravity casting of the metal materials such as cast steel, cast iron suitable for the vacuum antigravity casting of high temperature alloy.
Description
Technical field
The present invention relates to vacuum Counter-gravity Casting fields, specifically provide a kind of high-temperature alloy vacuum antigravity casting use
Stalk and its manufacturing method.
Background technique
Antigravity casting is a kind of casting forming process to grow up the 1950s.It is the molten metal in crucible
Overcome gravity and other resistances to fill casting mold from bottom to top along stalk under the effect of the pressure, and obtains casting under stress
A kind of method.Antigravity casting early stage is applied to the production of the casting such as copper sheathing and aluminium alloy wheel hub of vehicle.With foundry engieering
Development and the raising required casting product quality, the range of antigravity casting constantly extends at present, from simple casting
It is contour molten that part to thin-walled, complicated casting, from low-melting alloys such as aluminium alloy, magnesium alloys expands to cast iron, cast steel, high temperature alloy
Point alloy.
Hitchiner company, the U.S. has developed a series of vacuum antigravity casting patented technologies in succession, produces combustion gas wheel
The equipments such as machine, aerospace vehicle high temperature alloy precision casting.Howmet company, the U.S. then also uses anti-gravity vacuum pressing and casting
Technological development industry gas turbine high-temperature alloy casting, such as impeller, wheel disc.Due to high-temperature alloy casting high added value and
The advantages that vacuum Counter-gravity Casting bring casting is fine and close, aluminium alloy degree of purity is good, it is steady to fill type, high mechanical properties, state
The research for inside also having carried out some high temperature alloy antigravity castings in recent years is concentrated mainly on vacuum degree to liquid metal filling and coagulates
Gu in the influence of characteristic, the equipment and technique developed are at laboratory stage.
Stalk is one of critical component of antigravity casting.When filling type, under the action of process atmospheric pressures, molten metal passes through
Stalk enters in casting mold from crucible.When release, not solidified molten metal is back in crucible also by stalk.As pouring
Important constituent element in injection system, stalk have the function of water conservancy diversion and feeding, it should have air-tightness, chemical inertness and fill type mistake
Journey reliability plays a crucial role in antigravity casting technique.Currently, the development of domestic stalk is mainly gone back
Aluminium alloy antigravity casting application aspect is concentrated on, a large amount of patented technology is had accumulated.High temperature alloy not only have high density and
The features such as high-melting-point (>=1300 DEG C), also contains a variety of active metal elements such as Al, Ti, is easy to occur with stalk under high temperature acute
Strong physical-chemical reaction requires the stability at elevated temperature of stalk material harsher.Aluminum alloy low-pressure casting rises
700-900 DEG C of liquid pipe operating temperature, commercial aluminum alloy low-pressure casting stalk is for high temperature alloy antigravity casting and does not conform to
It is suitable, if aluminium titanates stalk temperature resistant capability is insufficient, 1200 DEG C of maximum operation (service) temperature, and the ceramic lift tubes such as silicon carbide, silicon nitride
It reacts under high temperature with aluminium alloy, generates gas.
Patent CN104163640A discloses a kind of microwave sintering system of low pressure casting high purity silicon nitride ceramic lift tube
Preparation Method, the stalk are used in the low pressure casting of aluminium alloy, 700~900 DEG C of the operating temperature of stalk；Patent
CN105645956A discloses a kind of preparation method of titanium nitride ceramic stalk, and stalk production is simple, low in cost, fits
Low pressure casting for aluminium alloy；Patent CN101612659B discloses the preparation of an Albatra metal antigravity casting stalk
Method, the method use heat resisting pipe for skeleton, and inside and outside graphite-pipe and steel tube screw thread composite joint, the stalk are suitable for work temperature
Spend the copper alloy antigravity casting at 1100 DEG C.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of high temperature alloy antigravity casting demand of meeting
The manufacturing method of stalk.There is high temperature resistant using stalk produced by the present invention, do not pollute high temperature alloy liquid, good thermal shock
The advantages that.
Technical solution of the present invention is as follows:
A kind of high temperature alloy antigravity casting stalk, it is characterised in that: the stalk is respectively equipped with from inside to outside
Inner coating 6, interior ceramic liner 4, refractory metal pipe 1, outer ceramic liner 3 and external coating 5, stalk top are additionally provided with rosette
2, rosette 2 is connected with metal tube 1.
As a preferred technical scheme:
The metal tube 1 is made of heat-resistant steel, and fusing point is high, and linear expansion coefficient is 12.4~13.5 × 10-6/ DEG C (0~
815℃)。
The inside and outside wall of the metal tube 1 has certain bulge-structure, preferably concaveconvex structure or helicitic texture, it is intended to
Improve the binding force of metal tube 1 and inside and outside ceramic liner.The bulge-structure can be used precision-investment casting and form, and can also pass through machine
Tool is processed and is gone out.
It is enclosed with interior ceramic liner 4 and outer ceramic liner 3 in 1 inside and outside wall of metal tube, thickness is 15-25mm, by resistance to
Fiery powder 30-40wt%, refractory aggregate 50-60wt%, refractory fibre 5-10wt% composition, using binder mixed refractory material
Ramming or grouting shape, in which: refractory powder is preferably SiO2、ZrO2、ZrSiO4、Al2O3、MgO2One of or it is several
Kind；Refractory aggregate be 60-100 mesh magnesium oxide sand, 2800 DEG C of fusing point, linear expansion coefficient 14 × 10-6/ DEG C (0-1000 DEG C), with
The heat resisting steel linear expansion coefficient that metal tube 1 is selected is close；Refractory fibre is alumina fibre and/or Zirconium oxide fibre.Someone
Once vitreous silica castable was selected to be connected as ceramic liner main material with heat resisting pipe, but the two coefficient-of-linear-expansion difference is very big
(vitreous silica linear expansion coefficient 0.5 × 10-6/ DEG C (0-1000 DEG C), much smaller than the linear expansion coefficient of heat resisting steel), stalk cracking
It is inclined to larger.The whole linear expansion coefficient and the metal pipe line coefficient of expansion of inside and outside ceramic liner of the present invention are close, and ceramic liner is anti-
Thermal shock resistance is excellent.
Outer ceramic liner 3 and interior ceramic liner 4, which are located at stalk bottom, is connected to form hollow integral structure.
External coating 5 and inner coating 6 is respectively coated on the outside of outer ceramic liner 3 and interior ceramic liner 4, which is
The stable rareearth oxidate powder of physicochemical properties, the rareearth oxidate powder preferably aoxidize yttrium powder, external coating 5 and inner coating
6 manufacturing method are as follows: by the high-purity yttrium oxide powder 75-90wt% of 100-400 mesh, acetic acid zirconium 8-23wt%, fatty alcohol polyoxy second
Ether 0.5-1wt%, n-octyl alcohol 0.3-1.2wt%, which is stirred evenly, is made coating, in the inside and outside pottery of stalk by the way of brushing
0.2-0.5mm thickness rare earth oxide coating on ceramic liner external coating spontaneously dries.
The rosette 2 is identical with 1 material of metal tube, is gone out by precision-investment casting integrally casting, and weldering can also be used
It connects mode the two links together.
Stalk manufacturing method provided by the invention includes the following steps:
(1) prepare metal tube 1 and rosette 2: metal tube 1 is made of heat resisting pipe, and internal and external walls have bulge-structure,
1 upper end of metal tube connects the rosette 2 of same material, and the two can also pass through welded connecting by casting integrated forming.
(2) inside and outside ceramic liner is prepared in 1 inside and outside wall of metal tube: resistance to using the mixing of the binders such as waterglass or silica solution
Fiery material ramming or grouting shape.
(3) rare earth oxide coating is prepared on inside and outside ceramic liner surface: coating under high temperature on the surface of inside and outside ceramic liner
Chemically stable coating, forms inner coating 6 and external coating 5, the coating by very thin (preferably 0.2-0.5mm) one layer of rare-earth oxidation
Object is constituted, and can effectively prevent the physical-chemical reaction of the high temperature alloy liquid and stalk under high temperature in crucible, guarantees high temperature alloy
Liquid it is pure.
Stalk of the present invention has an advantage that
1. 1 inside and outside wall of metal tube has uniformly distributed concaveconvex structure or helicitic texture, metal tube 1 and inside and outside ceramics can be improved
The binding force of lining reduces the tearing tendency of stalk during heating.
2. outer ceramic liner 3 and interior ceramic liner 4 are made of the ceramic material close with 1 linear expansion coefficient of metal tube, and are made pottery
Contain refractory fibre inside ceramic liner, thermal shock resistance is excellent.
3. the inside and outside rare earth oxide coating stable coated with physical chemistry under high temperature of stalk, can effectively prevent
The physical-chemical reaction of high temperature alloy liquid and stalk at a temperature of 1300 DEG C or more guarantees the pure of high temperature alloy liquid.
4. stalk produced by the present invention is not reacted since heat-resisting ability is strong with aluminium alloy, height can be not only used for
The antigravity casting of temperature alloy, it can also be used to the antigravity casting of the metal materials such as cast steel, cast iron.
Detailed description of the invention
Fig. 1 is stalk sectional view.
Fig. 2 is the metal tube schematic diagram (left: concaveconvex structure, the right side: helicitic texture) that inside and outside wall has certain structure.
Fig. 3 is stalk cross-sectional structure figure.
Fig. 4 is stalk cross section partial enlarged view.
Appended drawing reference: 1, metal tube, 2, rosette, 3, outer ceramic liner, 4, interior ceramic liner, 5, external coating, 6, inner coating.
Specific embodiment
Below in conjunction with the further elaborate of attached drawing.
Embodiment 1
A kind of manufacturing method of high temperature alloy antigravity casting stalk, process are as follows:
1) metal tube 1 and rosette 2, are prepared.1 material of metal tube is made of heat resisting pipe (1Cr17), is beaten using 3D
Impression method prepares the wax-pattern of metal tube 1 and rosette 2 of the inside and outside wall with concaveconvex structure, then uses precision-investment casting
Method produces the heat resisting pipe precision castings of 2 one of metal tube 1 and rosette.Metal tube 1 will pass through air tightness test,
Not leaking rear under 0.6Mpa pressure can be used.
2) stalk ceramic liner, is manufactured.According to a certain ratio by fire proofed wood feed powder, refractory aggregate, refractory fibre and viscous
It ties agent to be uniformly mixed, wherein fire proofed wood feed powder 35wt%, refractory aggregate 60wt%, refractory fibre 5wt%.The selection of fire proofed wood feed powder
SiO2、ZrO2And ZrSiO4, refractory aggregate selects 60-100 mesh magnesium oxide sand, and refractory fibre selective oxidation aluminum fiber, binder is
Sodium silicate binder.Wall surface prepares outer ceramic liner 3 and is connected with interior ceramic liner 4 inside and outside metal tube 1 by the way of ramming
The ceramic liner wet embryo being integrated.The thickness of the outer ceramic liner 3 and interior ceramic liner 4 is 15-25mm.By metal tube 1, round metal
Disk 2, outer ceramic liner 3 and interior ceramic liner 4 are placed in drying box and dry for 24 hours for 300 DEG C.
3) the inside and outside coating of rare earth oxide, is manufactured.By the high-purity yttrium oxide powder 75wt% of 100-400 mesh, acetic acid zirconium
23wt%, fatty alcohol polyoxy ether 1wt%, n-octyl alcohol 1wt%, which is stirred evenly, is made the coating with certain viscosity, using brushing
Mode the rare earth oxide coating of 0.2-0.5mm thickness is painted in the inside and outside wall of stalk, spontaneously dry.
Stalk toasts at adequately being spontaneously dried with 400-500 DEG C.Use the preceding heating rate with≤3 DEG C/min
1000 DEG C are heated slowly to, heat preservation uses after 2 hours.
Embodiment 2
A kind of manufacturing method of high temperature alloy antigravity casting stalk, process are as follows:
1) heat resisting steel metal tube 1 and rosette 2, are prepared.Metal tube 1 is made of heat resisting pipe (1Cr17), inside and outside
Wall processes internal and external threads by machining mode, then metal tube 1 and rosette 2 are connected to one by welding manner
It rises.Metal tube 1 will pass through air tightness test, and not leaking rear under 0.6Mpa pressure can be used.
2) stalk ceramic liner, is manufactured.According to a certain ratio by fire proofed wood feed powder, refractory material sand, refractory fibre and
Binder is uniformly mixed, wherein fire proofed wood feed powder 40wt%, refractory material sand 50wt%, refractory fibre 10wt%.Refractory material
Powder is ZrO2And Al2O3, refractory aggregate selection 60-100 mesh magnesium oxide sand, refractory fibre is Zirconium oxide fibre, and binder is that silicon is molten
Glue.The ceramic liner wet embryo that outer ceramic liner 3 and interior ceramic liner 4 are connected as one is prepared by the way of grouting forming.It is described outer
The thickness of ceramic liner 3 and interior ceramic liner 4 is 15-25mm.By metal tube 1, rosette 2, outer ceramic liner 3 and interior ceramic liner 4
It is placed on 300 DEG C of drying box drying for 24 hours.
3) the inside and outside coating of rare earth oxide, is manufactured.By the 90wt% high-purity yttrium oxide powder of 100-400 mesh, acetic acid zirconium
18wt%, fatty alcohol polyoxy ether 0.8wt%, n-octyl alcohol 1.2wt%, which is stirred evenly, is made coating, is being risen by the way of brushing
The inside and outside wall of liquid pipe paints the rare earth oxide coating of 0.2-0.5mm thickness, spontaneously dries.
Stalk toasts at adequately being spontaneously dried with 400-500 DEG C.Use the preceding heating rate with≤3 DEG C/min
1000 DEG C are heated slowly to, heat preservation uses after 2 hours.
The stalk that above embodiments are prepared has high temperature resistant, does not react with aluminium alloy, and it is excellent that thermal stability is good etc.
Point can guarantee the pure of high temperature alloy liquid, can be not only used for the antigravity casting of high temperature alloy, it can also be used to cast steel, casting
The antigravity casting of the metal materials such as iron.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of high temperature alloy antigravity casting stalk, it is characterised in that: in the stalk is respectively equipped with from inside to outside
Coating (6), interior ceramic liner (4), refractory metal pipe (1), outer ceramic liner (3) and external coating (5), stalk top are additionally provided with
Rosette (2), rosette (2) are connected with metal tube (1).
2. according to high temperature alloy antigravity casting stalk described in claim 1, it is characterised in that: metal tube (1) is by heat-resisting
Steel is made, and linear expansion coefficient is 12.4~13.5 × 10-6/℃。
3. according to high temperature alloy antigravity casting stalk described in claim 1, it is characterised in that: metal tube (1) it is inside and outside
Wall has certain bulge-structure.
4. according to the high temperature alloy antigravity casting stalk of claim 1 or 3, it is characterised in that: metal tube (1) it is interior
Outer wall has concaveconvex structure or helicitic texture.
5. according to high temperature alloy antigravity casting stalk described in claim 1, it is characterised in that: outer ceramic liner (3) and interior
The thickness of ceramic liner (4) is 15-25mm, by refractory powder 30-40wt%, refractory aggregate 50-60wt%, refractory fibre 5-
10wt% composition, is shaped using binder mixed refractory material ramming or grouting.
6. according to high temperature alloy antigravity casting stalk described in claim 5, it is characterised in that: refractory powder SiO2、
ZrO2、ZrSiO4、Al2O3、MgO2One or more of, refractory aggregate is 60-100 mesh magnesium oxide sand, and refractory fibre is oxidation
Aluminum fiber and/or Zirconium oxide fibre.
7. according to high temperature alloy antigravity casting stalk described in claim 1, it is characterised in that: external coating (5) and interior painting
Layer (6) basis material is rareearth oxidate powder.
8. according to high temperature alloy antigravity casting stalk described in claim 7, it is characterised in that: the rareearth oxidate powder
To aoxidize yttrium powder, the manufacturing method of external coating (5) and inner coating (6) are as follows: by the high-purity yttrium oxide powder 75- of 100-400 mesh
90wt%, acetic acid zirconium 8-23wt%, fatty alcohol polyoxy ether 0.5-1wt%, n-octyl alcohol 0.3-1.2wt%, which is stirred evenly, is made painting
Material, by the way of brushing on the inside and outside ceramic liner external coating of stalk 0.2-0.5mm thickness rare earth oxide coating, from
It is so dry.
9. according to high temperature alloy antigravity casting stalk as claimed in claim 1 or 2, it is characterised in that: rosette (2) and
Metal tube (1) material is identical, integrally formed by precision-investment casting, or the two is linked together using welding manner.
10. the manufacturing method of high temperature alloy antigravity casting stalk described in a kind of claim 1, which is characterized in that including
Following steps:
1), prepare metal tube (1) and rosette (2): metal tube (1) is made of heat resisting pipe, and internal and external walls have protrusion knot
Structure, metal tube (1) upper end connect the rosette (2) of same material, and the two is by casting integrated forming, or passes through welded connecting；
2), in metal tube (1), inside and outside wall prepares inside and outside ceramic liner: inside and outside ceramic liner is by refractory powder 30-40wt%, fire resisting bone
Expect 50-60wt%, refractory fibre 5-10wt% composition, is shaped using binder mixed refractory material ramming or grouting；
3), in inside and outside ceramic liner surface prepares coating: by the high-purity yttrium oxide powder 75-90wt% of 100-400 mesh, acetic acid zirconium 8-
23wt%, fatty alcohol polyoxy ether 0.5-1wt%, n-octyl alcohol 0.3-1.2wt%, which is stirred evenly, is made coating, using the side of brushing
Formula 0.2-0.5mm thickness rare earth oxide coating on the inside and outside ceramic liner external coating of stalk spontaneously dries.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711391173.0A CN109940152B (en) | 2017-12-21 | 2017-12-21 | Liquid lifting pipe for high-temperature alloy antigravity casting and manufacturing method thereof |
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|---|---|---|---|
| CN201711391173.0A CN109940152B (en) | 2017-12-21 | 2017-12-21 | Liquid lifting pipe for high-temperature alloy antigravity casting and manufacturing method thereof |
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| CN109940152B CN109940152B (en) | 2021-10-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199006A (en) * | 2021-04-15 | 2021-08-03 | 江苏迅隆铝业有限公司 | Composite lift pipe for sand mold low pressure |
| CN114799130A (en) * | 2022-04-08 | 2022-07-29 | 浙江万丰精密制造有限公司 | Composite liquid lifting pipe |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115007796A (en) * | 2022-05-30 | 2022-09-06 | 中信戴卡股份有限公司 | Riser tube coating for cast aluminum alloy and application method thereof |
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| CN109940152B (en) | 2021-10-01 |
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Address after: 110000 No.17, Yunfeng South Street, Tiexi District, Shenyang City, Liaoning Province Patentee after: Shenyang Foundry Research Institute Co., Ltd. of China National Machinery Research Institute Group Address before: 110000 No.17, Yunfeng South Street, Tiexi District, Shenyang City, Liaoning Province Patentee before: SHENYANG RESEARCH INSTITUTE OF FOUNDRY Co.,Ltd. |