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Controllable temperature gradient unidirectional solidification device and method

A technology of directional solidification and temperature gradient, applied in the field of preparing materials with magnetic anisotropy and tissue anisotropy, can solve the problem of poor consistency of material structure and performance, inability to realize temperature gradient control of solid-liquid interface, low yield, etc. problems, to achieve the effect of good consistency, high yield and stable process

Inactive Publication Date: 2010-09-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods and equipment cannot realize the control of the temperature gradient of the solid-liquid interface during the directional solidification process, and the structure and performance of the prepared material are poor in consistency and the yield is low.

Method used

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  • Controllable temperature gradient unidirectional solidification device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Insert the pouring plug rod 6 into the pouring hole at the bottom of the smelting crucible 7, and then pour the purity not lower than 99.5% Tb, 99.5Dy and high-purity Fe into Tb 0.3 Dy 0.7 Fe 2 (Atomic ratio) 11.26 kg was put into the melting crucible 7 . Start the vacuum system to raise the vacuum to 10 -3 Pa, filled with 0.5atm argon. Start the power supply to heat and melt the raw materials. When the raw materials are completely melted, shake the handwheel of the temperature measuring mechanism to make the temperature measuring rod contact the molten metal for temperature measurement, and adjust the power of the induction power supply to make the melting temperature reach 1300°C. Adjust the movable water-cooling ring 13 to a distance of 10mm from the lower end of the solid-liquid interface during directional solidification, so that the temperature gradient of the solid-liquid interface during the directional solidification process is 500°C / cm. Start the control m...

Embodiment 2

[0022] Insert the pouring plug rod 6 into the pouring hole at the bottom of the smelting crucible 7, and then pour the purity not lower than 99.5% Tb, 99.5Dy and high-purity Fe into Tb 0.3 Dy 0.7 Fe 2 (Atomic ratio) 13.12 kg was put into the melting crucible 7 . Start the vacuum system to raise the vacuum to 10 -3 Pa, filled with 0.5atm argon. Start the power supply to heat and melt the raw materials. When the raw materials are completely melted, shake the handwheel of the temperature measuring mechanism to make the temperature measuring rod contact the molten metal for temperature measurement, and adjust the power of the induction power supply to make the melting temperature reach 1300°C. Adjust the movable water-cooling ring 13 to a distance of 200 mm from the lower end of the solid-liquid interface during directional solidification, so that the temperature gradient of the solid-liquid interface during the directional solidification process is 5° C. / cm. Start the control...

Embodiment 3

[0024] Insert the pouring plug rod 6 into the pouring hole at the bottom of the smelting crucible 7, and then pour the purity not lower than 99.5% Tb, 99.5Dy and high-purity Fe into Tb 0.3 Dy 0.7 Fe 2 (Atomic ratio) 14.61 kg was put into the melting crucible 7 . Start the vacuum system to raise the vacuum to 10 -3 Pa, filled with 0.5atm argon. Start the power supply to heat and melt the raw materials. When the raw materials are completely melted, shake the handwheel of the temperature measuring mechanism to make the temperature measuring rod contact the molten metal for temperature measurement, and adjust the power of the induction power supply to make the melting temperature reach 1300°C. Adjust the movable water cooling ring 13 to a distance of 110mm from the lower end of the solid-liquid interface during directional solidification, so that the temperature gradient of the solid-liquid interface during the directional solidification process is 239.50°C / cm. Start the contr...

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Abstract

The invention belongs to the material preparation field, which provides a controllable temperature gradient unidirectional solidification device and a method and is applicable to the preparation of the material with magnetic anisotropy and structural anisotropy. The unidirectional solidification device consists of fusion, heat preservation, a pull-down mechanism, a cooling system and a control system. The fusion, unidirectional solidification and thermal processing are completed on the same device. By adjusting the relative position of a movable cooling ring (13) and a solid liquid interface, the temperature gradient of the solid liquid interface in the solidification process is controlled. The cooling ring and the solid liquid interface can be regulated and controlled at 10 to 200mm. The temperature gradient of the solid liquid interface can be regulated and controlled at 5 to 500 degrees centigrade / cm. The invention is applicable to the preparation of the rare earth giant magnetostrictive material, the Nd-Fe-B permanent magnet material and the samarium-cobalt permanent magnet material with magnetocrystalline anisotropy and the high temperature ally and steel material with the structural anisotropy. The invention has the advantages of stable technology, the good consistency of the prepared unidirectional solidification material and high finished product rate.

Description

technical field [0001] The invention belongs to the field of material preparation and provides a controllable temperature gradient directional solidification device and method, which are suitable for preparing materials with magnetic anisotropy and tissue anisotropy. Background technique [0002] Directional solidification technology can provide a temperature gradient in a single direction during the metal crystallization process, eliminate the lateral grain boundaries generated during the crystallization process, and make the crystal grow along this direction as much as possible, so that the casting has a single-directional columnar crystal or single crystal structure. This structural feature can strengthen the physical or mechanical properties of castings in a certain direction, so it has irreplaceable value in the fields of magnetic, superalloy, steel and other material preparation. For example: rare earth giant magnetostrictive materials with magnetocrystalline anisotrop...

Claims

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Application Information

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IPC IPC(8): B22D27/04
Inventor 张深根左志军田建军潘德安
Owner UNIV OF SCI & TECH BEIJING
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