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Method of titanium or titanium alloy melting liquid deoxidizing purification

A technology for titanium alloys and melts, applied in the field of deoxidation and purification of titanium or titanium alloy melts, can solve the problems of affecting performance, affecting the performance of castings, and increasing oxygen content, so as to improve tensile strength, improve protection function, and improve high temperature strength. Effect

Inactive Publication Date: 2007-02-14
SHANGHAI UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the industry, the smelting of titanium and titanium alloys often adopts vacuum consumable electrode arc shell solidification furnace melting and forced water-cooled copper crucible cooling. Protect the titanium melt from being polluted by the crucible material and heat insulation; due to the fast cooling speed of the water-cooled copper crucible and the formed "condensation shell", the temperature field of the titanium melt is not uniform, and the titanium liquid remains in the liquid state for a short time , so that the composition of the casting after pouring is not uniform, thus affecting the performance of the casting; in addition, this method consumes a lot of energy
Someone proposed to use calcium oxide crucible to smelt titanium and titanium alloys, but after melting with calcium oxide crucible, the oxygen content in titanium liquid will increase, which will affect its performance. Therefore, it is necessary to solve the problem of oxygen content control when using calcium oxide crucible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Melting titanium-nickel shape memory alloy in a calcium oxide crucible in a vacuum intermediate frequency induction furnace, when the alloy melts up to 1650 ° C, add a rare earth alloy purifier in a proportion of 0.04% by melt weight; the weight percentage of each component of the rare earth alloy is : La 35%, Ce 25%, Nd 25%, Pr 10%, Y 5%; keep at the above melting temperature for 20 minutes, then cast. After testing, the liquid oxygen content of the titanium alloy is reduced from the original 1200ppm to 290ppm, its plasticity is increased by 20%, and its hardness is reduced by 5%.

Embodiment 2

[0011] Melt Ti6Al4V alloy with calcium oxide crucible in vacuum intermediate frequency induction furnace. When the alloy melts up to 1700°C, add rare earth alloy purifying agent according to the ratio of 0.08% of the melt weight; the weight percentage of each component of rare earth alloy is: La 45 %, Ce 35%, Nd 5%, Pr 10%, Y 5%; keep at the above melting temperature for 20 minutes, then cast. After testing, the liquid oxygen content of the titanium alloy is reduced from 3400ppm to 2000ppm, and the plasticity is increased by 15%.

Embodiment 3

[0013] Use calcium oxide crucible to smelt pure titanium in a vacuum intermediate frequency induction furnace. When the pure titanium is melted to 1720°C, add a rare earth alloy purifier at a ratio of 0.08% of the melt weight; the weight percentage of each component of the rare earth alloy is: La55 %, Ce 25%, Nd 20%; keep at the above melting temperature for 20 minutes, then pour. After testing, the liquid oxygen content of titanium has been reduced from 5400ppm to 4000ppm, and the plasticity has been improved.

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PUM

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Abstract

The invention relates to a method to deoxidize and purify titanium or titanium alloy. It adopts rare earth as element purifying agent to take deoxidizing and purification process to titanium or titanium alloy. The agent includes La 35-55wt%, Ce 25-35wt%, Nd 5-25wt%, Pr 8-10wt%, and Y 4-5wt%. The added quantity agent is 0.01-0.1% of the weight of titanium metal liquation. The titanium or titanium alloy is melted in vacuum middle frequency induction furnace lime crucible. When the temperature reaches to 1650-1720 degree centigrade, the agent would be added and quieting for 15-25 minutes and casting to gain the titanium or titanium alloy with low oxygen content.

Description

technical field [0001] The invention relates to a method for deoxidizing and purifying titanium or titanium alloy melt, which belongs to the technical field of metal purification treatment technology. Background technique [0002] Due to the high melting point of titanium and its very active chemical properties, it can almost react with crucible refractory materials such as zirconia, magnesia, silicon oxide, etc. during smelting, so it is not suitable for induction furnace smelting. At present, in the industry, the smelting of titanium and titanium alloys often adopts vacuum consumable electrode arc shell solidification furnace melting and forced water-cooled copper crucible cooling. Protect the titanium melt from being polluted by the crucible material and heat insulation; due to the fast cooling speed of the water-cooled copper crucible and the formed "condensation shell", the temperature field of the titanium melt is uneven, and the titanium liquid remains in the liquid s...

Claims

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Application Information

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IPC IPC(8): C22B9/10C22B34/12C22C1/06
CPCY02P10/25
Inventor 毛协民欧阳志英徐东李重河朱明刘宏葆周星康迪沈彬张蔷张金龙
Owner SHANGHAI UNIV
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