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A method of purifying metal materials under temperature difference

A technology for metal materials and metal purification, applied in the field of metal purification, can solve the problems of accelerated diffusion of impurity atoms, interdiffusion pollution, compound slag inclusion, etc., and achieve the effects of avoiding secondary pollution, high efficiency and low cost

Inactive Publication Date: 2016-01-27
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the getter will interdiffuse with the material to be purified to cause pollution, or form compounds inside the molten material to cause slag inclusions and inclusions, which will bring disadvantages to the purification work
In addition, the temperature gradient is the driving force for accelerating the diffusion of impurity atoms, and the research on directly using the temperature difference to purify metals, semi-metals and alloys needs further development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Saw the rare earth gadolinium to be purified (oxygen content 1600massppm) into a 2*2*10mm cuboid, and take a piece. Saw yttrium (oxygen content 16600massppm) into the same size and take a piece. The gadolinium block and the yttrium block are separated by 10mm, and placed in a tube furnace for heating, the heating temperature at the gadolinium end is 1100°C, and the heating temperature at the yttrium end is about 1080°C. The vacuum in the tube furnace is 10 3 Pa, heating time 12h. After the reaction, the surface of the gadolinium block was polished, and the oxygen content was detected to drop to about 500 massppm.

Embodiment 2

[0024] Saw the metallurgical grade silicon to be purified (oxygen content 1000massppm) into a cube of 2*2*2mm, and take a piece. Take calcium (analytical pure) about twice the volume of silicon block, cut into small pieces. Put the gadolinium block and the calcium block into the tantalum boat with a distance of 80mm, and place them together in a tube furnace for heating. The heating temperature at the silicon end is 900°C, and the heating temperature at the calcium end is about 700°C. High-purity hydrogen is introduced into the tube furnace with a pressure of about 10 2 Pa, heating time 12h. After the reaction, the calcium coated on the silicon surface was removed, the surface of the silicon block was polished, and the oxygen content was detected to drop to about 500 massppm.

Embodiment 3

[0026] Saw the samarium-iron alloy to be purified (hydrogen and oxygen contents are 500 and 2000massppm respectively) into a cube of 2*2*2mm, and take a piece. Take the Ti-Zr (7:3) alloy and saw it into the same size, and take a piece. The samarium-iron block and the Ti-Zr alloy block are separated by 0.1mm, and they are placed together in a tube furnace for heating. The heating temperature at the end of the samarium-iron alloy is 900°C, and the heating temperature at the end of the Ti-Zr alloy is about 899°C. Fill the tube furnace with argon gas at a pressure of about 10 3 Pa, holding time 1min. After the reaction, the surface of the samarium-iron alloy block was polished, and it was detected that the oxygen content dropped to about 1950massppm and the hydrogen content dropped to 450massppm.

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PUM

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Abstract

The invention discloses a method for purifying a metal material under a temperature difference. According to the method, a metal material to be purified and a degassing agent are placed into a closed system and the inner part of the closed system is vacuum or is in an appropriate atmosphere; a certain distance is kept between a raw material and the degassing agent to heat under the temperature difference; in the heating process, impurities enter the closed system from the metal material to be purified and then are absorbed by the degassing agent. The method for purifying the metal material under the temperature difference has low requirements on a geometric dimension of the metal material, original impurity content and vacuum degree, is low in cost and high in efficiency, and has a great potential for realizing industrialization.

Description

technical field [0001] The invention relates to the field of metal purification, in particular to a method for removing one or more non-metallic impurities from metal materials in the presence of a getter. Background technique [0002] For a long time, getters have been widely studied and applied due to their special properties. The getter and some gases in the surrounding environment (such as N 2 , O 2 、H 2 etc.) has a strong affinity, and at a certain temperature, it can reduce the partial pressure of certain gases in the environment to an extremely low level in equilibrium. Utilizing this characteristic, the getter is used to obtain ultra-high vacuum and refine and purify materials. [0003] Getters have always played an important role in the field of metal, semi-metal and alloy refining. The external getter method using Ti, Zr, etc. as getters is used for the purification of high melting point metals (such as Nb, V, etc.); the internal getter method using Al, Fe, et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/10
Inventor 田丰李星国王志强颜世宏李里李国玲
Owner PEKING UNIV
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