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Metallic resistor heating device used for ultrahigh temperature directional solidification

A technology of directional solidification and resistance heating, applied in furnace heating elements and other directions, can solve the problems of material pollution and internal flow of the melt, and achieve the effect of high heating temperature, good stability and accurate temperature control

Active Publication Date: 2013-01-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the prior art that can only meet the requirements below 1300°C, pollute the material, and cause the internal flow of the melt, the present invention proposes a metal resistance heating device for ultra-high temperature directional solidification

Method used

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  • Metallic resistor heating device used for ultrahigh temperature directional solidification
  • Metallic resistor heating device used for ultrahigh temperature directional solidification
  • Metallic resistor heating device used for ultrahigh temperature directional solidification

Examples

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Effect test

Embodiment 1

[0020] Such as figure 2 As shown, this embodiment is made of tungsten, including electrodes 12 , an upper heat conduction ring 13 , a resistance heating body 5 and a lower heat conduction ring 15 . The top of the resistance heating body 5 is connected to the upper heat conduction ring 13 , and the bottom is connected to the lower heat conduction ring 15 , and the electrodes 12 are respectively fixed on the upper surface of the upper heat conduction ring 13 to form a circuit.

[0021] The resistance heating body 5 includes four identical arc-shaped heating blocks 14, and the radian of each arc-shaped heating block is π / 2. Combine four arc-shaped heating blocks into a cylindrical shape to form a resistance heating body 5 . The wall thickness of the arc-shaped heating block is 0.5 mm, and the height is 1.2 times the length of the crucible.

[0022] The upper heat conduction ring 13 is composed of two semicircular rings; the outer diameter of the upper heat conduction ring 13 i...

Embodiment 2

[0027] Such as figure 2 As shown, this embodiment is made of tungsten, including electrodes 12 , an upper heat conduction ring 13 , a resistance heating body 5 and a lower heat conduction ring 15 . The top of the resistance heating body 5 is connected to the upper heat conduction ring 13 , and the bottom is connected to the lower heat conduction ring 15 , and the electrodes 12 are respectively fixed on the upper surface of the upper heat conduction ring 13 to form a circuit.

[0028] The resistance heating body 5 includes four identical arc-shaped heating blocks 14, and the radian of each arc-shaped heating block is π / 2. Combine four arc-shaped heating blocks into a cylindrical shape to form a resistance heating body 5 . The wall thickness of the arc-shaped heating block is 1.5 mm, and the height is 1.7 times the length of the crucible.

[0029] The upper heat conduction ring 13 is composed of two semicircular rings; the outer diameter of the upper heat conduction ring 13 i...

Embodiment 3

[0034] Such as figure 2 As shown, this embodiment is made of tungsten, including electrodes 12 , an upper heat conduction ring 13 , a resistance heating body 5 and a lower heat conduction ring 15 . The top of the resistance heating body 5 is connected to the upper heat conduction ring 13 , and the bottom is connected to the lower heat conduction ring 15 , and the electrodes 12 are respectively fixed on the upper surface of the upper heat conduction ring 13 to form a circuit.

[0035] The resistance heating body 5 includes four identical arc-shaped heating blocks 14, and the radian of each arc-shaped heating block is π / 2. Combine four arc-shaped heating blocks into a cylindrical shape to form a resistance heating body 5 . The wall thickness of the arc-shaped heating block is 1.0 mm, and the height is 1.5 times the length of the crucible.

[0036] The upper heat conduction ring 13 is composed of two semicircular rings; the outer diameter of the upper heat conduction ring 13 i...

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Abstract

The invention discloses a metallic resistor heating device used for ultrahigh temperature directional solidification, which is made of refractory metal tungsten. A resistor heating body (5) is formed by combining four arc heating blocks (14) of which the radian is pi / 4; an upper heat conducting ring (13) consists of two semicircle rings and is positioned at the top end of the resistor heating body (5); a lower heat conducting ring (15) is round and is positioned at the bottom of the resistor heating body (5); the joint surface between the two semicircle heat conducting rings (13) is superposed with the joint surface of a certain pair of the arc heating blocks (14) in the resistor heating body (5); and the top parts of the two semicircle heat conducting rings (13) are provided with two electrodes (12) respectively. The metallic resistor heating device has a low enough vapor pressure at a high temperature, and does not pollute a furnace chamber and workpieces; and the heating body can be used under a neutral atmosphere, cannot form electromagnetic disturbances in the heating process, can reduce the flowage of a fused mass in the process of the directional solidification, and has thecharacteristics of high heating temperature, high stability and long service life.

Description

1. Technical field [0001] The invention relates to the field of solidification processing of metal materials, in particular to a metal resistance heating device for ultra-high temperature directional solidification. 2. Background technology [0002] Directional solidification technology has important applications in advanced structural and functional materials such as superalloys, magnetic materials, and composite materials. Heat flow control is an important link in directional solidification technology, and obtaining and maintaining unidirectional heat flow is an important guarantee for the success of directional solidification. Strengthening and maintaining better heating capacity is one of the necessary conditions for obtaining high temperature gradients. [0003] Commonly used heating methods in directional solidification technology include coil induction heating, coil induction plus graphite sleeve heating, resistance heating, electron beam zone melting and laser zone ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/64
Inventor 刘林赵新宝张军张卫国傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV