CN102400206A - Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient - Google Patents
Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient Download PDFInfo
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- CN102400206A CN102400206A CN2011103623405A CN201110362340A CN102400206A CN 102400206 A CN102400206 A CN 102400206A CN 2011103623405 A CN2011103623405 A CN 2011103623405A CN 201110362340 A CN201110362340 A CN 201110362340A CN 102400206 A CN102400206 A CN 102400206A
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Abstract
The invention relates to a combined type heat-insulating baffle which is applied to directional solidification equipment and is used for increasing monocrystal solidification temperature gradient. The combined type heat-insulating baffle comprises graphite rings and a flexible graphite felt, wherein the graphite rings and the flexible graphite felt are combined into an annular body, the inner diameter of which is more than the outer diameter of a shell mould to be cast; and the graphite rings are divided into two layers, the upper-layer graphite ring is directly placed on a water cooling sleeve in a directional solidification furnace, the flexible graphite felt is filled between the two layers of graphite ring, a height difference exists between the height of the inner diameter of the upper-layer graphite ring and the height of the outer diameter of the upper-layer graphite ring, and the height from the inner diameter to the outer diameter is increased in a smooth transition manner. The combined type graphite high-temperature heat-insulating baffle disclosed by the invention is convenient to manufacture by just clipping the flexible graphite felt according to dimensions and placing the clipped flexible graphite felt on the graphite rings on the water cooling sleeve as well as directly placing the second-layer graphite ring on the graphite felt, no bolts and nuts are needed for fixation, the placement is convenient and the price cost is low. Compared with the prior art in which a hard graphite felt is used as the heat-insulating baffle, the combined type heat-insulating baffle has the advantage that the temperature gradient is increased by almost 50%.
Description
Technical field
The present invention relates to a kind of apparatus for directional solidification that is applied to, improve the combined type thermal baffle of monocrystalline temperature of solidification gradient.
Background technology
Single crystal super alloy is one of important critical material of aircraft engine.Since the eighties in 20th century, turbine blade just is a crucial gordian technique of aircraft engine development and weaponry development with the single crystal super alloy technology always.At present, mainly obtain monocrystalline coupon and blade through rapid solidification method (HRS), the processing parameter of directional solidification technique comprises the thermograde G of solid-liquid interface forward position liquid phase in the process of setting
LPush ahead speed R with the solid, liquid interface.G
L/ R value is the important criterion of control single crystal growth interface stability.Directional solidification technique is being updated with device, and wherein one of gordian technique is to be devoted to improve the thermograde G of solid/liquid interfaces forward position liquid phase
L, to reach the purpose that improves monocrystalline part quality and qualification rate.
The major equipment of rapid solidification method (HRS) is a directional solidification furnace; Alloy pig is poured in the casting mold of mould chamber preheating; Casting mold is placed on the water mold; Casting mold pulls out the mold heating chamber with certain speed, and this process must guarantee to form higher thermograde in solid/liquid interfaces, and this is that single crystal alloy foundry goods crystalline is crucial.In order to obtain maximum thermograde, it is main with water mold mainly that process of setting will make the heat of early solidification scatter and disappear, and with the decline of casting mold, is aided with the heat loss through radiation of mo(U)ld face.For reducing in the mold heating chamber heat to the cold-zone of inferior segment heat loss through radiation; In mold heating chamber bottom a kind of thermal baffle is set; Through thermal baffle mold heating chamber and cooling zone, bottom are separated; Near thermal baffle, produce bigger thermograde, therefore, the effect of heat insulation of baffle plate has direct influence to the thermograde in solid-liquid interface forward position.
At present, the thermal baffle of apparatus for directional solidification use is mainly corundum ring, molybdenum sheet, hard graphite felt etc.Wherein, corundum ring is high temperature resistant, and still easy of crack in high temperature uses influences effect of heat insulation.The molybdenum sheet processing time consuming, cost is high.The hard graphite felt has effect of heat insulation preferably, but it is fragile, and work-ing life is short, and takes place to be prone to be damaged when shell leaks, and causes production process to interrupt.
Summary of the invention
The purpose of this invention is to provide thermograde in a kind of raising directional freeze process, easy to use and be not easy the combined type thermal baffle that rimose improves monocrystalline temperature of solidification gradient.
Technical scheme of the present invention is: the combined type thermal baffle comprises graphite annulus, soft graphite felt, and graphite annulus and soft graphite felt are combined as annular solid; The internal diameter of annular solid is greater than the external diameter of the shell mould of waiting to cast; Graphite annulus is divided into two layers, and lower floor's graphite annulus directly is placed on the water jacket in the directional solidification furnace, filled soft graphite felt in the middle of two layers of graphite annulus; There are difference of altitude in the height of the internal diameter of upper strata graphite annulus and external diameter height, and internal diameter height to external diameter height seamlessly transits and increases.
There are difference of altitude in the height and the external diameter height of the internal diameter of described upper strata graphite annulus; The external diameter height of upper strata graphite annulus is 2/3 of a combined type thermal baffle total height; The internal diameter of upper strata graphite annulus and external diameter difference of altitude are 45 degree, and internal diameter height to the external diameter height of upper strata graphite annulus seamlessly transits.
The slit that the internal diameter of described annular solid and waiting is cast between the external diameter of shell mould is controlled at 5～20mm.
Advantage of the present invention is: have good effect of heat insulation, help improving thermograde, use cost is low.Because upper strata graphite annulus upper surface is the inclined-plane, can effectively prevent bad baffle plate of shell leakage loss, reflected radiation face is increased, increase its reflecting effect.The graphite heat conducting coefficient raises with temperature and reduces, under high temperature, and graphite even one-tenth thermal insulator.At high temperature graphite surface has stronger metalluster, reflected radiation heat effective.The graphite thermal expansivity is little, and during temperature jump, volume change is little, can not crack.In addition, adopt soft graphite felt between two layers of graphite, to fill, can conveniently control shape, reach effect of heat insulation preferably.
Combined type graphite high temperature insulating baffle plate of the present invention is easily manufactured, as long as soft graphite felt is pressed the size cutting, is placed on the graphite annulus on the water jacket; Second layer graphite annulus is directly placed on the graphite felt and is got final product, and does not need bolt, nut to fix, the convenient arrangement; And processing is simple, and Costco Wholesale is low.Do thermal baffle with hard graphite felt in the prior art and compare, thermograde has improved nearly 50%.
Description of drawings
Fig. 1 is this bright section of structure.
Embodiment
Explain further details in the face of the present invention down.Technical scheme of the present invention is: like Fig. 1, shown in 2, the combined type thermal baffle comprises graphite annulus 1, soft graphite felt 2; Graphite annulus 1 is combined as annular solid with soft graphite felt 2, and the internal diameter of annular solid is greater than the external diameter of the shell mould of waiting to cast, and graphite annulus is divided into two layers; Lower floor's graphite annulus directly is placed on the water jacket in the directional solidification furnace; Filled soft graphite felt 2 in the middle of two layers of graphite annulus, there are difference of altitude in the height of the internal diameter of upper strata graphite annulus 3 and external diameter height, and internal diameter height to external diameter height seamlessly transits and increases.
Lower floor's graphite annulus 1 is placed on the water jacket in the directional solidification furnace; Soft graphite felt 2 obtains the interior external diameter identical with lower floor graphite annulus 1 through cutting out; Directly be placed on lower floor's graphite annulus 1, upper strata graphite annulus 3 planar one side directly is placed on the soft graphite felt 2, and the inclined-plane is simultaneously made progress.
Principle of work of the present invention is: combined type graphite high temperature insulating baffle plate of the present invention is applied in the directional solidification furnace vacuum high-temperature environment, is positioned at the heating member below.Upper strata graphite annulus 3 at high temperature surface has stronger metalluster, reflected radiation heat effective.Adopt the inclined-plane simultaneously, reflected radiation face is increased, increase its reflecting effect.Can prevent effectively simultaneously that thermal baffle is difficult for being damaged when shell splits leakage, can not cause production process to interrupt.The graphite heat conducting coefficient raises with temperature and reduces, even under high temperature, graphite becomes thermal insulator.In addition, adopt soft graphite felt 2 between two layers of graphite, to fill, utilize the well-insulated characteristics of graphite felt 2, reach further effect of heat insulation.
Embodiment 1
Use the combined type thermal baffle at ZGD-1 vacuum induction directional solidification furnace; The inside/outside diameter size of the annular solid of combined type thermal baffle is respectively Φ 200mm, Φ 250mm; The total height of annular solid is 150mm, and upper strata graphite annulus external diameter height is 100mm, and upper strata graphite annulus internal diameter height is 50mm.Through test, thermograde is brought up to 60～80 ℃/cm by 40～60 ℃ common/cm.
Embodiment 2
Use the combined type thermal baffle at DSP II type vacuum induction directional solidification furnace; The inside/outside diameter size of the annular solid of combined type thermal baffle is respectively Φ 220mm, Φ 270mm; The total height of annular solid is 150mm, and upper strata graphite annulus external diameter height is 100mm, and upper strata graphite annulus internal diameter height is 50mm.Through test, thermograde is 50～70 ℃/cm by 30～60 ℃ common/cm.
Claims (3)
1. a combined type thermal baffle that improves monocrystalline temperature of solidification gradient is characterized in that, the combined type thermal baffle comprises graphite annulus (1); Soft graphite felt (2); Graphite annulus (1) and soft graphite felt (2) are combined as annular solid, and the internal diameter of annular solid is greater than the external diameter of the shell mould of waiting to cast, and graphite annulus is divided into two layers; Lower floor's graphite annulus directly is placed on the water jacket in the directional solidification furnace; Filled soft graphite felt (2) in the middle of two layers of graphite annulus, there are difference of altitude in the height and the external diameter height of the internal diameter of upper strata graphite annulus (3), and internal diameter height to external diameter height seamlessly transits and increases.
2. a kind of combined type thermal baffle that improves monocrystalline temperature of solidification gradient according to claim 1; It is characterized in that; There are difference of altitude in the height and the external diameter height of the internal diameter of described upper strata graphite annulus (3); The external diameter height of upper strata graphite annulus (3) is 2/3 of a combined type thermal baffle total height, and the internal diameter of upper strata graphite annulus (3) and external diameter difference of altitude are 45 degree, and internal diameter height to the external diameter height of upper strata graphite annulus (3) seamlessly transits.
3. a kind of combined type thermal baffle that improves monocrystalline temperature of solidification gradient according to claim 1 is characterized in that, the slit that the internal diameter of described annular solid and waiting is cast between the external diameter of shell mould is controlled at 5～20mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110362340.5A CN102400206B (en) | 2011-11-15 | 2011-11-15 | Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient |
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|---|---|---|---|
| CN201110362340.5A CN102400206B (en) | 2011-11-15 | 2011-11-15 | Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient |
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| CN102400206A true CN102400206A (en) | 2012-04-04 |
| CN102400206B CN102400206B (en) | 2014-09-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894018A (en) * | 2017-04-01 | 2017-06-27 | 三峡大学 | A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities and method of coating |
| CN109930199A (en) * | 2017-12-18 | 2019-06-25 | 沈阳航发精密铸造有限公司 | A kind of induction heating directional crystallization furnace |
| CN110102743A (en) * | 2019-05-28 | 2019-08-09 | 深圳市万泽中南研究院有限公司 | A kind of combined heat-insulated plate in high-temperature alloy casting directional solidification stove |
| CN113279050A (en) * | 2021-05-13 | 2021-08-20 | 中国航发北京航空材料研究院 | Flexible heat insulation baffle for improving single crystal solidification temperature gradient |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101934367A (en) * | 2010-09-07 | 2011-01-05 | 沈阳铸造研究所 | Thermal-insulation baffle plate for liquid metal cooling and oriented solidification casting equipment |
| CN102179506A (en) * | 2011-04-07 | 2011-09-14 | 西北工业大学 | Compound heat insulation baffle used for directional solidification |
-
2011
- 2011-11-15 CN CN201110362340.5A patent/CN102400206B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101934367A (en) * | 2010-09-07 | 2011-01-05 | 沈阳铸造研究所 | Thermal-insulation baffle plate for liquid metal cooling and oriented solidification casting equipment |
| CN102179506A (en) * | 2011-04-07 | 2011-09-14 | 西北工业大学 | Compound heat insulation baffle used for directional solidification |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894018A (en) * | 2017-04-01 | 2017-06-27 | 三峡大学 | A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities and method of coating |
| CN106894018B (en) * | 2017-04-01 | 2023-06-02 | 三峡大学 | Preparation of directional growth M by in-situ heterogeneous nucleation 7 C 3 Device and method for preparing coating |
| CN109930199A (en) * | 2017-12-18 | 2019-06-25 | 沈阳航发精密铸造有限公司 | A kind of induction heating directional crystallization furnace |
| CN110102743A (en) * | 2019-05-28 | 2019-08-09 | 深圳市万泽中南研究院有限公司 | A kind of combined heat-insulated plate in high-temperature alloy casting directional solidification stove |
| CN113279050A (en) * | 2021-05-13 | 2021-08-20 | 中国航发北京航空材料研究院 | Flexible heat insulation baffle for improving single crystal solidification temperature gradient |
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| CN102400206B (en) | 2014-09-24 |
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Address after: 100095 box 81, Haidian District, Beijing Patentee after: AECC BEIJING INSTITUTE OF AERONAUTICAL MATERIALS Address before: 100095 mailbox 81, Beijing City Patentee before: AVIC BEIJING INSTITUTE OF AERONAUTICAL MATERIALS |
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Effective date of registration: 20220107 Address after: 550014 shawen ecological science and Technology Industrial Park, Baiyun District, Guiyang City, Guizhou Province Patentee after: GUIYANG HANGFA PRECISION CASTING Co.,Ltd. Address before: 100095 box 81, Haidian District, Beijing Patentee before: AECC BEIJING INSTITUTE OF AERONAUTICAL MATERIALS |