Single crystal blade directional solidification device

Abstract

The utility model discloses a single-crystal blade directional solidification device, which relates to the technical field of single-crystal high-temperature alloy blades, and comprises a shell, a cooling area and at least two heating areas, the mold shell moves from the heating areas to the cooling area, all the heating areas are distributed in the moving direction of the mold shell, and every two adjacent heating areas are isolated through a first baffle, so that all the heating areas conduct heating independently; the cooling area and the heating area are isolated through a second baffle. According to the single crystal blade directional solidification device, even if a large-size blade is large in length and low in directional solidification speed, the heating time of the large-size blade at the high temperature can be remarkably shortened, the precision of the size and the shape of the blade is improved, the surface reaction of a shell and alloy is reduced, and meanwhile due to effective temperature control, the production efficiency is improved. High-temperature directional solidification at the solid-liquid front edge during solidification can be realized, and a temperature gradient is formed, so that the qualification rate of large-size blade single crystals is improved.

Description

Technical Field

[0001] The present application relates to the technical field of single crystal high temperature alloy blades, and more specifically, to a single crystal blade directional solidification device. Background Art

[0002] Single-crystal high-temperature alloy turbine blades for aircraft engines and gas turbines require a directional solidification process. Heat transfer is the controlling link in the solidification process. In the preparation of single-crystal blades, the directional solidification method is to obtain a unidirectional heat flow. The shell containing the molten metal in the hot zone is heated to a temperature above the melting point of the alloy. The hot zone and the cold zone are separated by a baffle. When the shell is slowly pulled vertically through the baffle into the cold zone, the shell rapidly cools down and solidifies through radiation heat dissipation. The combination of appropriate temperature control parameters and pulling parameters can ensure that the heat dissipation at the solidification front is in the vertical direction, thereby obtaining directional solidification under an overall vertical directional heat flow.

[0003] In existing technology, during the directional solidification process of single-crystal blades, baffles are typically used to separate the hot and cold zones. The mold shell is slowly pulled vertically through the baffles into the cold zone for directional solidification. The hot zone physically consists of a single space. Although dual-zone heating is commonly used to heat the hot zone, the strong heat exchange between the two zones due to their interconnected space makes it impossible to achieve a significant temperature difference between the two zones.

[0004] Therefore, how to improve the controllability of the mold shell insulation temperature during the directional solidification process of single crystal blades has become a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a single crystal blade directional solidification device to improve the controllability of the mold shell insulation temperature during the single crystal blade directional solidification process.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A single crystal blade directional solidification device comprises a shell, a cooling zone and at least two heating zones, wherein:

[0008] The mold shell moves from the heating zone to the cooling zone, the heating zones are distributed along the moving direction of the mold shell, and two adjacent heating zones are separated by a first baffle, so that the heating zones are heated independently of each other;

[0009] The cooling zone and the heating zone are isolated from each other by a second baffle.

[0010] Optionally, in the above single crystal blade directional solidification device, the number of the heating zones is three, and each of the heating zones is, in the moving direction of the mold shell, a first heating zone, a second heating zone, and a third heating zone in sequence. The first heating zone and the cooling zone are isolated by the second baffle.

[0011] Optionally, in the above single crystal blade directional solidification device, the length of the first heating zone in the moving direction of the mold shell is not greater than the length of the second heating zone in the moving direction of the mold shell, and the length of the third heating zone in the moving direction of the mold shell is not less than the length of the second heating zone in the moving direction of the mold shell.

[0012] Optionally, in the above single crystal blade directional solidification device, the length of the first heating zone in the moving direction of the mold shell is 3 cm to 5 cm; and / or,

[0013] the length of the second heating zone in the moving direction of the mold shell is 5 cm to 10 cm.

[0014] Optionally, in the above single crystal blade directional solidification device, a water cooling ring is arranged in the cooling zone to cool the mold shell.

[0015] Optionally, in the above single crystal blade directional solidification device, a heat preservation housing is further included, and each of the heating zones is located inside the heat preservation housing.

[0016] Optionally, in the above single crystal blade directional solidification device, a moving base is arranged at the bottom of the mold shell, and the moving base is used to drive the mold shell to move from the heating zone to the cooling zone.

[0017] Optionally, in the above single crystal blade directional solidification device, a temperature sensing element is respectively arranged in each of the heating zones to monitor the temperature of the heating zone.

[0018] Optionally, in the above single crystal blade directional solidification device, the first baffle is a heat radiation baffle to block the heat transfer between each of the heating zones.

[0019] Optionally, in the above single crystal blade directional solidification device, a heating device is respectively arranged in each of the heating zones, and the heating device heats the mold shell by induction heating or resistance heating.

[0020] The single-crystal blade directional solidification device provided by the present application sets at least two heating zones, and isolates them through a first baffle between adjacent two heating zones, so that each heating zone can be heated independently, thereby realizing precise temperature control of different heating zones, improving the controllability of the mold shell insulation temperature during the single-crystal blade directional solidification process. At the same time, the heating zone and the cooling zone are isolated by a second baffle, so that the directional solidification effect is achieved when the mold shell moves from the heating zone to the cooling zone. As can be seen from the above example, the single-crystal blade directional solidification device provided by the present application enables large-size blades to significantly reduce their heating time at high temperatures, improve the accuracy of blade size and shape, reduce the surface reaction between the mold shell and the alloy, and at the same time, due to effective temperature control, high-temperature directional solidification of the solid-liquid front can be achieved during solidification, forming a temperature gradient, thereby improving the qualified rate of single crystals of large-size blades.

[0021] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not mutually contradictory. All feasible feature combinations are the technical contents clearly recorded in this article. Any one of the multiple sub-features included in the same sentence can be applied independently without necessarily being applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0023] Figure 1 It is a schematic structural diagram of the single-crystal blade directional solidification device provided by the embodiment of the present application.

[0024] Among them, 100 is the heating zone, 101 is the first baffle, 102 is the first heating zone, 103 is the second heating zone, 104 is the third heating zone, and 105 is the heating device;

[0025] 200 is the cooling zone, 201 is the second baffle, and 202 is the water-cooled ring;

[0026] 300 is the mold shell, and 301 is the moving base;

[0027] 400 is the heat preservation housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The core of the present application lies in providing a single-crystal blade directional solidification device to improve the controllability of the mold insulation temperature during the single-crystal blade directional solidification process.

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0030] Aero-engine and gas turbine single-crystal superalloy turbine blades need to be prepared by the directional solidification process. Heat transfer is the control link in the solidification process. In the preparation of single-crystal blades, the directional solidification method lies in obtaining a unidirectional heat flow. By heating the mold containing the molten metal in the hot zone to a temperature above the alloy melting temperature, a baffle is used to isolate the hot zone and the cold zone. When the mold is slowly pulled vertically through the baffle and enters the cold zone, the mold rapidly cools down by radiative heat dissipation and solidifies. The combination of appropriate temperature control parameters and pulling parameters can ensure that the heat dissipation at the solidification front is along the vertical direction, thus obtaining directional solidification under the overall vertically directional heat flow.

[0031] Single-crystal blades need to be prepared by the directional solidification process. Heat transfer is the control link in the solidification process. In the preparation of single-crystal blades, the directional solidification method lies in obtaining a unidirectional heat flow. By heating the mold containing the molten metal in the hot zone to a temperature above the alloy melting temperature, a baffle is used to isolate the hot zone and the cold zone. When the mold is slowly pulled vertically through the baffle and enters the cold zone, the mold rapidly cools down by radiative heat dissipation and solidifies. The combination of appropriate temperature control parameters and pulling parameters can ensure that the heat dissipation at the solidification front is along the vertical direction, thus obtaining directional solidification under the overall vertically directional heat flow.

[0032] In order to obtain single crystals, it is necessary to avoid the nucleation and growth of new grains during the entire directional solidification process of the blade. The molten alloy at the solidification front needs to be kept at a high temperature and in a liquid state all the time. Blades with complex shapes need to have a large enough temperature gradient to prevent the liquid phase at the solidification front from entering the cold zone. At the same time, the mushy zone where liquid and solid coexist needs to be narrow enough to avoid the fracture of dendrites from becoming new grain cores.

[0033] During the directional solidification process, the investment shell needs to be heated to a high temperature first, usually higher than 1500 °C. Therefore, during the directional solidification process of single crystal blades, the investment shell needs to be at a high temperature for a long time. In current technology, usually two heaters are used to heat the upper and lower parts of the hot zone respectively. And in order to keep the investment shell at a relatively low temperature when it enters the cold zone, the temperature control setting of the upper heating zone is usually lower than that of the lower part. However, due to the heating effect of the lower heating element on the upper part, even when the upper heater stops heating, the temperature difference between the upper and lower parts of the hot zone will not exceed 30 °C. This makes the investment shell in a high temperature situation throughout the directional solidification process.

[0034] In the prior art, during the directional solidification process of single crystal blades, a baffle is usually used to isolate the hot zone and the cold zone, and the investment shell is slowly pulled vertically through the baffle and into the cold zone for directional solidification. The hot zone physically consists of a space. Although usually a two-zone heating method is used to heat the hot zone, since the two heating zones are connected spaces, there is a strong heat exchange effect between the two zones, and it is impossible to control the temperature of the two heating zones with a significantly different arbitrary temperature difference.

[0035] In addition, the ceramic core and investment shell for preparing single crystal blades are usually composed of porous ceramic materials to form the complex outer shape and inner cavity of the blade, while ensuring sufficient collapsibility, removability and other process properties. However, porous materials tend to sinter and become solid at high temperatures. Sintering leads to deformation and cannot guarantee the dimensional accuracy of the blade. At the same time, sintering causes the collapsibility to degenerate, resulting in excessive casting residual stress in the blade. Therefore, the holding temperature of the directional solidification investment shell and the time of directional solidification are limited.

[0036] At the same time, for large-sized blades, the cross-sectional size is relatively large, and the heat that needs to be dissipated by the solidification front during the directional solidification process is relatively high, resulting in a small temperature gradient during directional solidification. Large-sized blades need to be directionally solidified at a higher investment shell holding temperature and a lower solidification rate. The blade size is relatively large, and the solidification time required by itself is relatively long. The lower speed requirement further increases the directional solidification time, resulting in greater casting difficulty for single crystal blades.

[0037] For this reason, as Figure 1As shown in the figure, the embodiment of the present application discloses a single crystal blade directional solidification device, which includes a mold shell 300, a cooling zone 200, and at least two heating zones 100. By setting at least two heating zones 100 and isolating them through a first baffle 101 between adjacent two heating zones 100, each heating zone 100 can be heated independently, so as to achieve precise temperature control of different heating zones 100, improve the controllability of the heat preservation temperature of the mold shell 300 during the single crystal blade directional solidification process. At the same time, the heating zone 100 and the cooling zone 200 are isolated by a second baffle 201, so as to achieve the effect of directional solidification when the mold shell 300 moves from the heating zone 100 to the cooling zone 200. Even when the large-size blade has a large length and a slow directional solidification speed, it can significantly reduce its heating time at high temperature, improve the accuracy of the blade size and shape, reduce the surface reaction between the mold shell 300 and the alloy. At the same time, due to effective temperature control, high-temperature directional solidification can be realized at the solid-liquid front during solidification, forming a temperature gradient, thereby improving the qualified rate of single crystals of large-size blades.

[0038] Next, a single crystal blade directional solidification device disclosed in the embodiment of the present application will be specifically explained and described in conjunction with Figure 1 This will be specifically explained and described.

[0039] Among them, the mold shell 300 can be pulled and moved from the heating zone 100 to the cooling zone 200 to realize the directional solidification process of the mold shell 300. At the same time, each heating zone 100 can be distributed along the moving direction of the mold shell 300, and adjacent heating zones 100 can be physically isolated by a first baffle 101, so that each heating zone 100 can be heated independently. In addition, the cooling zone 200 and the heating zone 100 can be isolated by a second baffle 201. Specifically, there can be two heating zones 100, and the two heating zones 100 can be isolated by a first baffle 101 to block the heating effect of the lower heating zone 100 on the upper heating zone 100, so that the upper heating zone 100 can be controlled at a lower temperature. At the same time, the heating zone 100 close to the cooling zone 200, that is, the lower heating zone 100, should have a length as small as possible to ensure that the mold shell 300 stays at a high temperature for as short a time as possible. According to the solidification speed of the single crystal blade and the thermal conductivity of the mold shell 300, the length of the lower heating zone 100 can be 3 cm to 5 cm. From the above example, it can be seen that by physically isolating adjacent heating zones 100 through the first baffle 101, each heating zone 100 becomes an independent heating unit, so that different regions separated by the first baffle 101 can be heated separately to improve the controllability of the heat preservation temperature of the mold shell 300 during the directional solidification process of large-size blades. It should be noted that the first baffle 101 can be a thermal radiation baffle to block the heat transfer. Of course, the first baffle 101 can also be a baffle of other forms or materials, as long as it can block the heat transfer, which is not limited herein.

[0040] Of course, the number of heating zones 100 can be two, but is not limited to two. Three, four, etc. can also be used. In some embodiments, as Figure 1 shown, the number of heating zones 100 is three. For ease of understanding, the three heating zones 100 are respectively defined as the first heating zone 102, the second heating zone 103, and the third heating zone 104, and the first heating zone 102, the second heating zone 103, and the third heating zone 104 are sequentially distributed along the moving direction of the mold shell 300. Among them, the first heating zone 102 is located at a position close to the cooling zone 200, and the first heating zone 102 and the cooling zone 200 are isolated by the second baffle 201. At the same time, adjacent two heating zones 100 are physically isolated by the first baffle 101 to enable each heating zone 100 to be heated independently. In addition, the length of the first heating zone 102 along the moving direction of the mold shell 300 is not greater than the length of the second heating zone 103 along the moving direction of the mold shell 300, and the length of the third heating zone 104 along the moving direction of the mold shell 300 is not less than the length of the second heating zone 103 along the moving direction of the mold shell 300, so as to ensure that the first heating zone 102 close to the cooling zone 200 has a length as small as possible, so that the mold shell 300 stays at a high temperature for as short a time as possible. According to the solidification speed of the single crystal blade and the thermal conductivity of the mold shell 300, the length of the first heating zone 102 can be 3 cm to 5 cm. And the second heating zone 103 located in the middle position serves as a transition buffer between the third heating zone 104 and the first heating zone 102, and its length should be moderate. An overly long second heating zone 103 will extend the heating time of the mold shell 300, and an overly short second heating zone 103 will reduce the buffering effect. The length of the second heating zone 103 can be 5 cm to 10 cm.

[0041] In order to achieve independent temperature control of each heating zone 100, in some embodiments, as Figure 1 shown, an independent heating device 105 is provided in each heating zone 100, so as to achieve separate heating of each heating zone 100. At the same time, temperature sensing elements can also be respectively provided in each heating zone 100 to monitor the temperature of each heating zone 100 and achieve precise temperature control of each heating zone 100. Of course, the temperature sensing element can also be built into the heating device 105, so that while the heating device 105 is heating, the temperature monitoring of the heating zone 100 can be achieved. Among them, the heating device 105 can heat the mold shell 300 by induction heating, heat by an induction heating graphite ring, or can also be heated by a resistance method, and heat by directly supplying power to the graphite heating body.

[0042] In order to achieve the cooling effect of the cooling zone 200, in some embodiments, as Figure 1As shown, a water-cooling ring 202 is provided in the cooling zone 200 to cool the mold shell 300. The water-cooling ring 202 uses water as a medium to achieve indirect heat exchange, so that the temperature can be quickly reduced to the required range, has a better heat dissipation effect, and can continuously and stably dissipate heat. During the cooling process, heat is transferred to the circulating water through a water cooler or a radiator, causing the water temperature to rise. Subsequently, the high-temperature circulating water releases heat to the environment through a cooling tower, a condenser or other cooling devices, thereby achieving the cooling of the water; the cooled water returns to the water cooler or radiator again to continue absorbing heat, forming a continuous cooling cycle system.

[0043] As Figure 1 As shown, the single crystal blade directional solidification device further includes a heat preservation shell 400, and each heating zone 100 is located inside the heat preservation shell 400 to avoid heat loss of the heating zone 100. Among them, the heat preservation shell 400 can adopt a multi-layer structure to ensure a stable and efficient heat preservation effect during the directional solidification process. The inner layer of the heat preservation shell 400 can adopt a ceramic thin shell, so that the heat preservation shell 400 has good high-temperature resistance and certain strength, can withstand the pouring pressure of the superalloy melt, and prevent heat from dissipating too quickly. Heat-conducting materials and heat-insulating materials can be alternately filled on the outer periphery of the ceramic thin shell. The heat-conducting materials can adopt metals or some ceramic materials with good heat-conducting properties, so that it can ensure that the heat is evenly distributed inside the heat preservation shell 400, reduce the temperature gradient, and is beneficial to the growth of single crystals. The heat-insulating materials can adopt asbestos, diatomaceous earth, expanded perlite, etc., so that it has good heat-insulating properties, can effectively reduce the heat dissipation to the outside, and improve the heat preservation effect.

[0044] As Figure 1 As shown, a moving base 301 is further provided at the bottom of the mold shell 300, so that the mold shell 300 can be pulled and moved from the heating zone 100 to the cooling zone 200 through the moving base 301, thereby achieving directional solidification. The moving base 301 can be moved by a lead screw motor or a lifting cylinder to drive the mold shell 300 on the moving base 301 to be pulled and moved from the heating zone 100 to the cooling zone 200.

[0045] In some embodiments, the heating device 105 utilizes resistive heating, directly supplying power to the graphite heating element. Two heating zones 100 are physically isolated by a heat radiation baffle, enabling independent temperature control and heating of each heating zone 100 by the corresponding heating device 105. This improves the controllability of the mold shell 300's insulation temperature during the directional solidification process of large-sized blades. Furthermore, to minimize the length of the heating zone 100 near the cooling zone 200 and ensure that the mold shell 300 remains at high temperature for as short a period as possible, the length of the heating zone 100 near the cooling zone 200 can be 5 cm, based on the typical solidification rate of single-crystal blades and the thermal conductivity of the mold shell 300.

[0046] In some embodiments, as Figure 1 As shown, the heating device 105 utilizes induction heating, generating heat through induction heating graphite rings. Three heating zones 100 can be provided, with adjacent heating zones 100 physically isolated by heat radiation barriers. This allows for independent temperature control and heating of each heating zone 100 by its corresponding heating device 105, thereby improving the controllability of the mold shell 300's insulation temperature during the directional solidification process of large-sized blades. Furthermore, to minimize the length of the heating zone 100 near the cooling zone 200 and ensure the shortest possible dwell time of the mold shell 300 at high temperatures, the length of the heating zone 100 near the cooling zone 200 can be 5 cm, based on the typical solidification rate of single-crystal blades and the thermal conductivity of the mold shell 300. The central heating zone 100 serves as a transition buffer between the upper and lower heating zones 100. Its length should be moderate. Excessive length prolongs the heating time of the mold shell 300, while excessive shortness reduces the buffering effect. The central heating zone 100 can be 8 cm long. At the same time, a heat radiation baffle is additionally provided between the middle heating zone 100 and the upper heating zone 100 to enhance the temperature control of the heating zone 100 .

[0047] When directional solidification is performed on large blades, the uppermost heating zone 100, located away from the cooling zone 200, should be temperature-controlled according to the single crystal superalloy directional solidification process to ensure the alloy remains in a liquid state. Furthermore, the temperature should be kept as low as possible to ensure that the mold shell 300 is subjected to the lowest possible temperatures, and should be controlled between 1400°C and 1450°C. The lowermost heating zone 100, located near the cooling zone, should be kept as high as possible within the tolerance range of the single crystal superalloy directional solidification process, and should be controlled between 1550°C and 1600°C. The middle heating zone 100, located between the uppermost and lowermost heating zones 100, should maintain a temperature between 1450°C and 1550°C to minimize drastic changes in the alloy liquid and thus reduce convection caused by the temperature difference.

[0048] In some embodiments, when directionally solidifying large-sized blades, the uppermost heating zone 100 far from the cooling zone 200 should control the temperature according to the directionally solidifying process of single-crystal superalloy to ensure that the alloy is in a liquid state. Moreover, the temperature should be as low as possible to ensure that the mold shell 300 is subjected to the lowest temperature effect, and its temperature is controlled at 1420 °C. The lowermost heating zone 100 close to the cooling zone should control the temperature within the acceptable range according to the directionally solidifying process of single-crystal superalloy as high as possible, and its temperature is controlled at 1550 °C. The heating zone 100 located at the middle position has its temperature controlled between the uppermost heating zone 100 and the lowermost heating zone 100 to reduce the degree of sharp change in the alloy liquid, thereby reducing the convection caused by the temperature difference, and its temperature is controlled at 1450 °C.

[0049] As can be seen from the above embodiments, the single-crystal blade directional solidification device provided by the present application can effectively achieve temperature control at different temperatures by setting at least two heating zones 100 and physically isolating them through the first baffle 101 between two adjacent heating zones 100. Even when the large-sized blade has a large length and a slow directional solidification speed, it can significantly reduce its heating time at high temperatures, improve the accuracy of the blade size and shape, reduce the surface reaction between the mold shell 300 and the alloy. At the same time, due to effective temperature control, high-temperature directional solidification of the solid-liquid front can be achieved during solidification to form a temperature gradient, thereby improving the qualification rate of single crystals of large-sized blades and ensuring the dimensional accuracy and surface metallurgical quality of large-sized blades.

[0050] The terms "first" and "second" etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single crystal blade directional solidification device, characterized in that It includes a shell (300), a cooling zone (200) and at least two heating zones (100), where: The shell (300) moves from the heating zone (100) to the cooling zone (200). Each heating zone (100) is distributed along the moving direction of the shell (300), and adjacent two heating zones (100) are isolated by a first baffle (101) so that each heating zone (100) is heated independently; The cooling zone (200) is isolated from the heating zone (100) by a second baffle (201).

2. The single crystal blade directional solidification device according to claim 1, characterized in that, The number of the heating zones (100) is three, and each heating zone (100) is successively a first heating zone (102), a second heating zone (103) and a third heating zone (104) along the moving direction of the shell (300). The first heating zone (102) is isolated from the cooling zone (200) by the second baffle (201).

3. The single crystal blade directional solidification device according to claim 2, characterized in that, The length of the first heating zone (102) along the moving direction of the shell (300) is not greater than the length of the second heating zone (103) along the moving direction of the shell (300), and the length of the third heating zone (104) along the moving direction of the shell (300) is not less than the length of the second heating zone (103) along the moving direction of the shell (300).

4. The single crystal blade directional solidification device according to claim 3, characterized in that, The length of the first heating zone (102) along the moving direction of the shell (300) is 3 cm to 5 cm; and / or, The length of the second heating zone (103) along the moving direction of the shell (300) is 5 cm to 10 cm.

5. The single crystal blade directional solidification device according to claim 1, characterized in that, The cooling zone (200) is provided with a water cooling ring (202) to cool the shell (300).

6. The single-crystal blade directional solidification device according to claim 1, wherein It further includes a heat preservation housing (400), and each heating zone (100) is located inside the heat preservation housing (400).

7. The single crystal blade directional solidification device according to claim 1, wherein, The bottom of the shell (300) is provided with a moving base (301), and the moving base (301) is used to drive the shell (300) to move from the heating zone (100) to the cooling zone (200).

8. The single crystal blade directional solidification device according to claim 1, characterized in that, Each heating zone (100) is respectively provided with a temperature sensing element to monitor the temperature of the heating zone (100).

9. The single crystal blade directional solidification apparatus according to claim 1, characterized in that, The first baffle (101) is a heat radiation baffle to block the heat transfer between each heating zone (100).

10. The single crystal blade directional solidification device according to any one of claims 1 to 9, characterized in that, Each heating zone (100) is respectively provided with a heating device (105), and the heating device (105) heats the shell (300) by induction heating or resistance method.

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