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Device for directionally solidifying by locally and forcibly heating with resistance at high gradient

A technology of resistance heating and directional solidification, which is applied in the field of directional solidification material preparation, can solve the problems of low temperature gradient and insufficient melting of samples, and achieve the effect of high temperature gradient

Inactive Publication Date: 2010-08-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects in the prior art that the temperature gradient is low due to the overall heating and melting of the sample; or the insufficient melting of the sample due to regional induction heating, the present invention proposes a local enhanced resistance heating high-gradient directional solidification device

Method used

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  • Device for directionally solidifying by locally and forcibly heating with resistance at high gradient
  • Device for directionally solidifying by locally and forcibly heating with resistance at high gradient
  • Device for directionally solidifying by locally and forcibly heating with resistance at high gradient

Examples

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Effect test

Embodiment 1

[0021] This embodiment is a local enhanced resistance heating high-gradient directional solidification device, including a power line 1, a thermocouple 2, a heat shield 3, a crystallizer 4, a furnace body, a liquid metal 5, a drawing system 6, a crucible 9, tungsten Barrel 10, shielding layer 11, resistance ring 13 and tantalum electrode 15. The alloy heated in this example is DZ125 directionally solidified nickel-based superalloy, the local strengthening temperature is 2000°C, the overall heating temperature is 1500°C, and a temperature gradient of 600°C / cm is obtained on the basis of ensuring the complete melting of the sample.

[0022] The furnace body includes an upper furnace body 14 and a lower furnace body 7. In the lower furnace body 7, from the center of the lower furnace body to the outside, there are successively a drawing system 6 and a crystallizer 4. Liquid metal 5 is housed in the crystallizer 4; The pulling system 6 passes through the furnace bottom of the lowe...

Embodiment 2

[0030] This embodiment is a local enhanced resistance heating high-gradient directional solidification device, including a power line 1, a thermocouple 2, a heat shield 3, a crystallizer 4, a furnace body, a liquid metal 5, a drawing system 6, a crucible 9, tungsten Barrel 10, shielding layer 11, resistance ring 13 and tantalum electrode 15. The alloy heated in this example is AM3 single crystal superalloy alloy, the local strengthening temperature is 1650°C, the overall heating temperature is 1500°C, and a temperature gradient of 290°C / cm is obtained on the basis of ensuring the complete melting of the sample.

[0031]The furnace body includes an upper furnace body 14 and a lower furnace body 7. In the lower furnace body 7, from the center of the lower furnace body to the outside, there are sequentially a drawing system 6 and a crystallizer 4, and the crystallizer 4 is equipped with liquid metal 5; The pulling system 6 passes through the bottom of the lower furnace body 7 and...

Embodiment 3

[0039] This embodiment is a locally enhanced resistance heating high gradient directional solidification device, including a power cord 1, a thermocouple 2, a heat shield 3, a crystallizer 4, a furnace body, a liquid metal 5, a drawing system 6, a crucible 9, a tungsten The barrel 10 , the shielding layer 11 , the resistance ring 13 and the tantalum electrode 15 . The alloy heated in this example is DZ125 directional solidification nickel-based superalloy, the local strengthening temperature is 2000 °C, and the overall heating temperature is 1500 °C, and a temperature gradient of 600 °C / cm is obtained on the basis of ensuring the complete melting of the sample.

[0040] The furnace body includes an upper furnace body 14 and a lower furnace body 7. In the lower furnace body 7, from the center of the lower furnace body to the outside, there are sequentially a drawing system 6 and a crystallizer 4, and the crystallizer 4 is equipped with liquid metal 5; The pulling system 6 passe...

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Abstract

The invention relates to a device for directionally solidifying by locally and forcibly heating with resistance at high gradient, comprising an upper oven and a lower oven. A crucible, a resistance ring, a tungsten cylinder and a shielding layer are arranged in sequence from the center of the upper oven to the outside of the upper oven, and the crucible, the resistance ring and the tungsten cylinder are arranged in the shielding layer; power leads are respectively connected to the upper surfaces of both the tungsten cylinder and the resistance ring; the power lead of the tungsten cylinder and the power lead of the resistance wire are respectively and independently connected with a power supply and are used for wholly heating the sample in the crucible through the tungsten cylinder and partially and forcibly heating the sample in the crucible through the resistance ring which is arranged on the lower part of the crucible; and two thermocouples are respectively on the upper part and the lower part of the tungsten cylinder and are respectively used for measuring the temperature of the tungsten cylinder and the resistance ring. The device can wholly heat the sample and locally and forcibly heat the sample to ensure that the sample obtains the high-temperature gradient and can be fully melted on the front edge of the solid / liquid interface and can reduce the burning loss of the low melting point elements. In addition, the device can be used for more materials of different size and can eliminate the forced convection of the melt, which is caused by the traditional induction heating.

Description

technical field [0001] The invention relates to the field of directional solidification material preparation, in particular to a locally enhanced resistance heating high-gradient directional solidification device. Background technique [0002] Directional solidification technology can arrange the solidified structure of the material in a specific direction, obtain directional and single crystal structure, and improve material performance. In the directional solidification process of materials, high temperature gradient is the guarantee to obtain ultra-fine structure, reduce composition segregation, control microscopic defects and phase distribution. In addition, high temperature gradients can increase the draw rate while ensuring an optimized solidification structure, thereby increasing production efficiency. Therefore, high temperature gradient is the goal pursued by directional solidification equipment. The development history of directional solidification technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
Inventor 张军刘林傅恒志黄太文王常帅赵新宝
Owner NORTHWESTERN POLYTECHNICAL UNIV
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