CN102400206B - 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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- CN102400206B CN102400206B CN201110362340.5A CN201110362340A CN102400206B CN 102400206 B CN102400206 B CN 102400206B CN 201110362340 A CN201110362340 A CN 201110362340A CN 102400206 B CN102400206 B CN 102400206B
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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 composite type heat-insulating baffle plate 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 is just a very important gordian technique of aircraft engine development and Weapon Development by single crystal super alloy technology always.At present, mainly by rapid solidification method (HRS), obtain monocrystalline coupon and blade, the processing parameter of directional solidification technique comprises the thermograde G of solid-liquid interface forward position liquid phase in process of setting
lpush ahead speed R with solid, liquid interface.G
l/ R value is to control the important criterion of single crystal growth interface stability.Directional solidification technique and device are being updated, 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 object that improves monocrystalline part quality and qualification rate.
The major equipment of rapid solidification method (HRS) is directional solidification furnace, alloy pig is poured in the casting mold of mould chamber preheating, casting mold is placed on water mold, casting mold pulls out mold heating chamber with certain speed, this process must guarantee to form higher thermograde in solid/liquid interfaces, and this is the key of single crystal alloy foundry goods crystallization.In order to obtain maximum thermograde, process of setting will make the heat loss of early solidification mainly take water mold as main, with the decline of casting mold, is aided with the heat loss through radiation of mo(U)ld face.For heat in minimizing mold heating chamber is to the cold-zone heat loss through radiation of inferior segment, in mold heating chamber bottom, a kind of thermal baffle is set, by thermal baffle, mold heating chamber and cooling zone, bottom are separated, near thermal baffle, produce larger thermograde, therefore, the effect of heat insulation of baffle plate has a direct impact the thermograde in solid-liquid interface forward position.
At present, the thermal baffle that apparatus for directional solidification uses is mainly corundum ring, molybdenum sheet, hard graphite felt etc.Wherein, corundum ring is high temperature resistant, but easily ftractures in applied at elevated temperature, affects effect of heat insulation.Molybdenum sheet processing time consuming, cost is high.Hard graphite felt has good effect of heat insulation, but it is fragile, and work-ing life is short, and easily damaged when shell occurring leaking, and causes production process to interrupt.
Summary of the invention
The object of this invention is to provide thermograde in a kind of raising directional freeze process, easy to use and be not easy the composite type heat-insulating baffle plate of raising monocrystalline temperature of solidification gradient of cracking.
Technical scheme of the present invention is: composite type heat-insulating baffle plate comprises graphite annulus, soft graphite felt, graphite annulus and soft graphite felt are combined as annular solid, the internal diameter of annular solid is greater than the external diameter of shell mould to be cast, graphite annulus is divided into two layers, and lower floor's graphite annulus is directly placed on the water jacket in directional solidification furnace, filled soft graphite felt in the middle of two layers of graphite annulus, there is difference of altitude in the height of the internal diameter of upper strata graphite annulus and external diameter height, internal diameter height seamlessly transits and increases to external diameter height.
There is difference of altitude in 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 composite type heat-insulating baffle plate total height, the internal diameter of upper strata graphite annulus and external diameter difference of altitude are 45 degree, and the internal diameter height of upper strata graphite annulus to external diameter height seamlessly transits.
Gap between the internal diameter of described annular solid and the external diameter of shell mould to be cast is controlled at 5～20mm.
Advantage of the present invention is: have good effect of heat insulation, be conducive to improve thermograde, use cost is low.Because upper strata graphite annulus upper surface is inclined-plane, can effectively prevent bad baffle plate of shell leakage loss, make reflected radiation face increase simultaneously, increase its reflecting effect.Graphite heat conducting coefficient raises and reduces with temperature, and at high temperature, graphite even becomes thermal insulator.At high temperature graphite surface has stronger metalluster, reflected radiation heat effective.The graphite thermal coefficient of expansion is little, and during temperature jump, volume change is little, can not crack.In addition, adopt soft graphite felt to fill between two layers of graphite, can conveniently control shape, reach good effect of heat insulation.
Combined type graphite high temperature insulating baffle plate of the present invention is easily manufactured, as long as soft graphite felt is pressed to size cutting, is placed on the graphite annulus on water jacket, on the direct placing graphite felt of second layer graphite annulus, do not need bolt, nut to fix, convenient arrangement, and processing is simple, Costco Wholesale is low.Do thermal baffle with hard graphite felt in prior art and compare, thermograde has improved nearly 50%.
Accompanying drawing explanation:
Fig. 1 is this bright section of structure.
Embodiment
Below the present invention is described in further details.Technical solution of the present invention is: as shown in Figure 1, 2, composite type heat-insulating baffle plate 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 shell mould to be cast, and graphite annulus is divided into two layers, lower floor's graphite annulus is directly placed on the water jacket in directional solidification furnace, filled soft graphite felt 2 in the middle of two layers of graphite annulus, there is difference of altitude in the height of the internal diameter of upper strata graphite annulus 3 and external diameter height, and internal diameter height seamlessly transits and increases to external diameter height.
Lower floor's graphite annulus 1 is placed on the water jacket in directional solidification furnace, soft graphite felt 2 obtains the internal-and external diameter identical with lower floor's graphite annulus 1 by cutting out, directly be placed on lower floor's graphite annulus 1, the one side of upper strata graphite annulus 3 planes is directly placed in soft graphite felt 2, and 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 directional solidification furnace vacuum high-temperature environment, is positioned at heating member below.Upper strata graphite annulus 3 at high temperature surface has stronger metalluster, reflected radiation heat effective.Adopt inclined-plane simultaneously, reflected radiation face is increased, increase its reflecting effect.Can effectively prevent that at shell, splitting while leaking thermal baffle is difficult for damagedly, can not cause production process to interrupt simultaneously.Graphite heat conducting coefficient raises and reduces with temperature, and even, at high temperature, graphite becomes thermal insulator.In addition, adopt soft graphite felt 2 to fill between two layers of graphite, utilize the well-insulated feature of graphite felt 2, reach further effect of heat insulation.
Embodiment 1
At ZGD-1 vacuum induction directional solidification furnace, use composite type heat-insulating baffle plate, the inside/outside diameter size of the annular solid of composite type heat-insulating baffle plate 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 common 40～60 ℃/cm.
Embodiment 2
At DSP II type vacuum induction directional solidification furnace, use composite type heat-insulating baffle plate, the inside/outside diameter size of the annular solid of composite type heat-insulating baffle plate 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 common 30～60 ℃/cm.
Claims (2)
1. a composite type heat-insulating baffle plate that improves monocrystalline temperature of solidification gradient, it is characterized in that, composite type heat-insulating baffle plate comprises graphite annulus (1), soft graphite felt (2), graphite annulus (1) is combined as annular solid with soft graphite felt (2), the internal diameter of annular solid is greater than the external diameter of shell mould to be cast, graphite annulus is divided into two layers, lower floor's graphite annulus is directly placed on the water jacket in directional solidification furnace, filled soft graphite felt (2) in the middle of two layers of graphite annulus, there is difference of altitude in height and the external diameter height of the internal diameter of upper strata graphite annulus (3), the external diameter height of upper strata graphite annulus (3) is 2/3 of composite type heat-insulating baffle plate total height, and the internal diameter height of upper strata graphite annulus (3) seamlessly transits and increases to external diameter height.
2. a kind of composite type heat-insulating baffle plate that improves monocrystalline temperature of solidification gradient according to claim 1, is characterized in that, the gap between the internal diameter of described annular solid and the external diameter of shell mould to be cast is controlled at 5～20mm.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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 CN102400206A (en) | 2012-04-04 |
| CN102400206B true CN102400206B (en) | 2014-09-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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 |
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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 |
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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 |