CN113279050A - Flexible heat insulation baffle for improving single crystal solidification temperature gradient - Google Patents
Flexible heat insulation baffle for improving single crystal solidification temperature gradient Download PDFInfo
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- CN113279050A CN113279050A CN202110520517.3A CN202110520517A CN113279050A CN 113279050 A CN113279050 A CN 113279050A CN 202110520517 A CN202110520517 A CN 202110520517A CN 113279050 A CN113279050 A CN 113279050A
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- graphite ring
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- flexible fiber
- fiber plate
- temperature gradient
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention relates to the technical field of directional solidification vacuum precision casting, in particular to a flexible heat insulation baffle for improving the temperature gradient of single crystal solidification, which comprises an upper layer graphite ring, an upper outer layer graphite ring, a lower outer layer graphite ring and a flexible fiber plate, wherein the outer side of one end of the flexible fiber plate is provided with the lower layer graphite ring, the outer side of the other end of the flexible fiber plate is provided with the upper layer graphite ring, the middle part of the flexible fiber plate is provided with a gap, the flexible fiber plate is provided with a casting shell through the gap, the surface of the graphite ring has good metallic luster at high temperature, the effect of anti-radiation heat insulation is good, the flexible fiber plate is woven by SiC fibers, the flexible fiber plate can be used for a long time at high temperature and has flexibility, when the casting shell passes through the flexible fiber plate, the flexible fiber plate can not obstruct the movement of the casting shell and can be tightly attached to the outer surface of the casting shell, so as to reduce heat loss and improve the temperature gradient of the solid-liquid interface.
Description
Technical Field
The invention relates to the technical field of directional solidification vacuum precision casting, in particular to a flexible heat insulation baffle for improving the single crystal solidification temperature gradient.
Background
The nickel-based single crystal superalloy has excellent comprehensive properties of high-temperature creep resistance, fatigue resistance, oxidation resistance, thermal corrosion resistance and the like, so that the nickel-based single crystal superalloy is widely applied to aeroengine blade components with high thrust-weight ratio. At present, the actual preparation of the single crystal blade mainly adopts a directional solidification method, the change of a temperature field in the directional solidification process can cause the change of the form of a mushy zone and the temperature gradient of a solid-liquid front edge, thereby influencing the growth of a single crystal tissue, and the higher temperature gradient is a necessary condition for obtaining a good single crystal tissue. The directional solidification furnace is an important device for producing single crystal blades, in order to shield the radiation heat dissipation from a high-temperature region to a low-temperature region in the directional solidification furnace as much as possible and maintain a higher temperature gradient at the front of solid and liquid, a set of heat insulation baffle is required to be arranged at the bottom of a heating region of the directional solidification furnace, and the heating region and a cooling region are separated by the heat insulation baffle. The influence of the heat insulation effect of the heat insulation baffle on the temperature gradient is obvious, patent CN2495968Y discloses a novel high-temperature heat insulation baffle, but the baffle centre bore is big and can not be adjusted, so when the irregular casting shell of size passes through, there is big hole between heat insulation baffle and the shell surface, and good heat insulation effect is not played, so a flexible heat insulation baffle for improving the single crystal solidification temperature gradient is needed to improve the above problems.
Disclosure of Invention
The invention aims to provide a flexible heat insulation baffle for improving the single crystal solidification temperature gradient so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an improve flexible thermal-insulated baffle of single crystal solidification temperature gradient, includes upper graphite ring, goes up outer graphite ring, lower floor's graphite ring, outer graphite ring and flexible fiberboard down, the outside of flexible fiberboard one end is provided with lower floor's graphite ring, the outside of the flexible fiberboard other end is provided with upper graphite ring, the outside of lower floor's graphite ring is provided with outer graphite ring down, the outer wall of upper graphite ring is provided with outer graphite ring, the gap has been seted up to the centre department of flexible fiberboard, the foundry goods shell is installed through the gap to the flexible fiberboard.
Preferably, two gaps are formed in the center of the flexible fiberboard, and the two gaps are arranged in a cross-shaped structure; or a round hole is formed in the center of the flexible fiber board and corresponds to the gap.
Preferably, the upper outer layer graphite ring and the lower outer layer graphite ring are made of hard graphite carbon, and the upper layer graphite ring and the lower layer graphite ring are made of soft graphite carbon.
Preferably, the flexible fiber board is made of SiC fiber by weaving.
Preferably, the upper layer graphite ring, the upper outer layer graphite ring, the lower layer graphite ring and the lower outer layer graphite ring are all arranged concentrically with the flexible fiberboard.
Preferably, the flexible fiberboard has at least one gap in the middle to allow the casting shell to pass through the layer of fiberboard.
Compared with the prior art, the invention has the beneficial effects that:
the graphite ring surface adopted in the invention has good metallic luster at high temperature, and the anti-radiation heat insulation effect is good; the flexible fiber board is woven by SiC fiber and is formed, and it can use for a long time under high temperature, and has the flexibility, and when the foundry goods shell passed flexible fiber board, flexible fiber board can not hinder the removal of foundry goods shell, and can realize comparatively inseparable laminating with foundry goods shell surface to reduce calorific loss, improve solid-liquid interface's temperature gradient.
Drawings
FIG. 1 is a schematic sectional view of a flexible baffle structure provided in example 1 of the present invention;
FIG. 2 is a top view of a flexible baffle structure provided in example 1 of the present invention;
FIG. 3 is a top view of a shell of examples 1 and 2 of the present invention as it passes through a flexible baffle structure;
FIG. 4 is a top view of a flexible baffle structure provided in example 2 of the present invention;
FIG. 5 is a top view of a flexible baffle structure provided in example 3 of the present invention;
fig. 6 is a top view of a flexible baffle structure through which a shell passes in example 3 of the present invention.
In the figure: 1. an upper graphite ring; 2. an upper outer layer graphite ring; 3. a lower graphite ring; 4. a lower outer graphite ring; 5. a flexible fiber sheet; 6. a gap; 7. casting shell molding; 8. a circular hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution:
a flexible heat insulation baffle for improving the single crystal solidification temperature gradient comprises an upper layer graphite ring 1, an upper outer layer graphite ring 2, a lower layer graphite ring 3, a lower outer layer graphite ring 4 and a flexible fiber plate 5, wherein the lower layer graphite ring 3 is arranged on the outer side of one end of the flexible fiber plate 5, the upper layer graphite ring 1 is arranged on the outer side of the other end of the flexible fiber plate 5, the lower outer layer graphite ring 4 is arranged on the outer side of the lower layer graphite ring 3, the upper outer layer graphite ring 2 is arranged on the outer wall of the upper layer graphite ring 1, a gap 6 is formed in the middle of the flexible fiber plate 5, a casting shell 7 is installed on the flexible fiber plate 5 through the gap 6, two gaps 6 are formed in the center of the flexible fiber plate 5, and the two gaps 6 are arranged in a cross; or the center of the flexible fiber plate 5 is provided with a round hole 8 corresponding to the gap 6, the upper outer layer graphite ring 2 and the lower outer layer graphite ring 4 are made of hard graphite carbon, the upper layer graphite ring 1 and the lower layer graphite ring 3 are made of soft graphite carbon, the flexible fiber plate 5 is made of SiC fiber by weaving, the upper layer graphite ring 1, the upper outer layer graphite ring 2, the lower layer graphite ring 3 and the lower outer layer graphite ring 4 are all concentrically arranged with the flexible fiber plate 5, at least one gap 6 is arranged in the middle of the flexible fiber plate 5, so that the casting shell 7 can pass through the layer of fiber plate 5, the surface of the graphite ring has good metallic luster at high temperature, the effect of anti-radiation and temperature insulation is good, the flexible fiber plate 5 is woven by SiC fiber, the flexible fiber plate can be used for a long time at high temperature and has flexibility, when the casting shell 7 passes through the flexible fiber plate 5, the flexible fiber plate 5 can not obstruct the movement of the casting shell 7, and can realize relatively close laminating with casting shell 7 surface to reduce calorific loss, improve the temperature gradient of solid-liquid interface.
Example 1: as shown in fig. 1 and fig. 2, the graphite plate comprises an upper graphite ring 1, an upper outer graphite ring 2, a lower graphite ring 3, a lower outer graphite ring 4 and a flexible fiber plate 5, wherein the lower graphite ring 3 is arranged outside one end of the flexible fiber plate 5, the upper graphite ring 1 is arranged outside the other end of the flexible fiber plate 5, the lower outer graphite ring 4 is arranged outside the lower graphite ring 3, the upper outer graphite ring 2 is arranged on the outer wall of the upper graphite ring 1, a gap 6 is arranged in the middle of the flexible fiber plate 5, a casting shell 7 is arranged on the flexible fiber plate 5 through the gap 6, the upper outer graphite ring 2 and the lower outer graphite ring 4 are made of hard graphite carbon, the upper graphite ring 1 and the lower graphite ring 3 are made of soft graphite carbon, the flexible fiber plate 5 is made of SiC fiber by weaving, the upper graphite ring 1, the upper outer graphite ring 2, the lower graphite ring 3 and the lower outer graphite ring 4 are all concentrically arranged with the flexible fiber plate 5, during the use, arrange the upper surface of water-cooling jacket in with flexible baffle to be located heating member shielding layer, when foundry goods shell 7 passed flexible fiber board 5, flexible fiber board 5 can not obstruct the removal of foundry goods shell 7, and can realize comparatively inseparable laminating with foundry goods shell 7 surface, as shown in fig. 3.
Example 2: as shown in fig. 1 and 4, the graphite plate comprises an upper graphite ring 1, an upper outer graphite ring 2, a lower graphite ring 3, a lower outer graphite ring 4 and a flexible fiber plate 5, wherein the lower graphite ring 3 is arranged outside one end of the flexible fiber plate 5, the upper graphite ring 1 is arranged outside the other end of the flexible fiber plate 5, the lower outer graphite ring 4 is arranged outside the lower graphite ring 3, the upper outer graphite ring 2 is arranged on the outer wall of the upper graphite ring 1, a gap 6 is arranged in the middle of the flexible fiber plate 5, a casting shell 7 is arranged on the flexible fiber plate 5 through the gap 6, a round hole 8 can be arranged in the center of the flexible fiber plate 5 corresponding to the gap 6, the upper outer graphite ring 2 and the lower outer graphite ring 4 are made of hard graphite carbon, the upper graphite ring 1 and the lower graphite ring 3 are made of soft graphite carbon, the flexible fiber plate 5 is made of woven SiC fibers, the upper graphite ring 1, Go up outer graphite ring 2, lower floor's graphite ring 3, outer graphite ring 4 all sets up with flexible fiber board 5 is concentric down, during the use, arrange the upper surface of water-cooling jacket in with flexible baffle to be located the heating member shielding layer, when foundry goods shell 7 passed flexible fiber board 5, the round hole 8 at flexible fiber board 5 center can make the removal of foundry goods shell 7 easier, and can realize comparatively inseparable laminating with 7 surfaces of foundry goods shell, as shown in fig. 3.
Example 3: as shown in fig. 1 and 5, the graphite plate comprises an upper graphite ring 1, an upper outer graphite ring 2, a lower graphite ring 3, a lower outer graphite ring 4 and a flexible fiber plate 5, wherein the lower graphite ring 3 is arranged outside one end of the flexible fiber plate 5, the upper graphite ring 1 is arranged outside the other end of the flexible fiber plate 5, the lower outer graphite ring 4 is arranged outside the lower graphite ring 3, the upper outer graphite ring 2 is arranged on the outer wall of the upper graphite ring 1, a gap 6 is arranged in the middle of the flexible fiber plate 5, a casting shell 7 is arranged on the flexible fiber plate 5 through the gap 6, two gaps 6 can be opened in the center of the flexible fiber plate 5, the two gaps 6 are arranged in a cross structure, the upper outer graphite ring 2 and the lower outer graphite ring 4 are made of hard graphite carbon, the upper graphite ring 1 and the lower graphite ring 3 are made of soft graphite carbon, the flexible fiber plate 5 is made of fiber by weaving SiC, the upper graphite ring 1, the upper outer graphite ring 2, the lower graphite ring 3 and the lower outer graphite ring 4 are all arranged concentrically with the flexible fiber board 5, and when the flexible baffle plate is used, the flexible baffle plate is arranged on the upper surface of the water cooling jacket and is positioned in the heating body shielding layer. When the casting shell 7 passes through the flexible fibreboard 5, the flexible fibreboard 5 does not obstruct the movement of the casting shell 7 and a relatively close fit to the outer surface of the casting shell 7 is achieved, as shown in figure 6.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides an improve single crystal solidification temperature gradient's flexible thermal-insulated baffle, includes upper graphite ring (1), goes up outer graphite ring (2), lower floor's graphite ring (3), outer graphite ring (4) and flexible fiber board (5) down, its characterized in that: a lower-layer graphite ring (3) is arranged on the outer side of one end of the flexible fiberboard (5), an upper-layer graphite ring (1) is arranged on the outer side of the other end of the flexible fiberboard (5), a lower-layer graphite ring (4) is arranged on the outer side of the lower-layer graphite ring (3), and an upper-layer graphite ring (2) is arranged on the outer wall of the upper-layer graphite ring (1);
at least one gap (6) is arranged in the middle of the flexible fiber board (5) so that a casting shell (7) can penetrate through the fiber board (5); when the casting shell (7) is installed on the flexible fiberboard (5) through the gap (6), the flexible fiberboard (5) is tightly attached to the outer surface of the casting shell (7).
2. A flexible thermal shield to enhance single crystal solidification temperature gradient according to claim 1, wherein: two gaps (6) are formed in the center of the flexible fiber board (5), and the two gaps (6) are arranged in a cross-shaped structure; or the center of the flexible fiber board (5) is provided with a round hole (8) corresponding to the gap (6).
3. A flexible thermal shield to enhance single crystal solidification temperature gradient according to claim 1, wherein: go up outer graphite ring (2) and outer graphite ring (4) down and adopt hard graphite carbon preparation, upper graphite ring (1) and lower floor's graphite ring (3) adopt soft graphite carbon preparation.
4. A flexible thermal shield to enhance single crystal solidification temperature gradient according to claim 1, wherein: the flexible fiber board (5) is made of SiC fibers in a weaving mode.
5. A flexible thermal shield to enhance single crystal solidification temperature gradient according to claim 1, wherein: the upper-layer graphite ring (1), the upper outer-layer graphite ring (2), the lower-layer graphite ring (3) and the lower outer-layer graphite ring (4) are all arranged concentrically with the flexible fiberboard (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520517.3A CN113279050A (en) | 2021-05-13 | 2021-05-13 | Flexible heat insulation baffle for improving single crystal solidification temperature gradient |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520517.3A CN113279050A (en) | 2021-05-13 | 2021-05-13 | Flexible heat insulation baffle for improving single crystal solidification temperature gradient |
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| CN113279050A true CN113279050A (en) | 2021-08-20 |
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| CN202110520517.3A Pending CN113279050A (en) | 2021-05-13 | 2021-05-13 | Flexible heat insulation baffle for improving single crystal solidification temperature gradient |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5429176A (en) * | 1992-09-25 | 1995-07-04 | T&N Technology Limited | Thermal radiation baffle for apparatus for use in directional solidification |
| CN1853826A (en) * | 2005-04-29 | 2006-11-01 | 中国科学院金属研究所 | Heat-insulated baffle for oriented freezing cast |
| CN202070753U (en) * | 2011-04-07 | 2011-12-14 | 西北工业大学 | Composite heat insulation baffle for directional solidification |
| CN102400206A (en) * | 2011-11-15 | 2012-04-04 | 中国航空工业集团公司北京航空材料研究院 | Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient |
| CN109355697A (en) * | 2018-11-27 | 2019-02-19 | 沈阳航发精密铸造有限公司 | A kind of crystallographic orientation furnace temperature thermal baffle |
-
2021
- 2021-05-13 CN CN202110520517.3A patent/CN113279050A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5429176A (en) * | 1992-09-25 | 1995-07-04 | T&N Technology Limited | Thermal radiation baffle for apparatus for use in directional solidification |
| CN1853826A (en) * | 2005-04-29 | 2006-11-01 | 中国科学院金属研究所 | Heat-insulated baffle for oriented freezing cast |
| CN202070753U (en) * | 2011-04-07 | 2011-12-14 | 西北工业大学 | Composite heat insulation baffle for directional solidification |
| CN102400206A (en) * | 2011-11-15 | 2012-04-04 | 中国航空工业集团公司北京航空材料研究院 | Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient |
| CN109355697A (en) * | 2018-11-27 | 2019-02-19 | 沈阳航发精密铸造有限公司 | A kind of crystallographic orientation furnace temperature thermal baffle |
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Application publication date: 20210820 |
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