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Preparation method for titanium-aluminium alloy

A technology of titanium aluminum alloy and titanium salt, which is applied in the field of alloys, can solve the problems of easy retention, low aluminum content, incomplete alloying, etc., and achieve the effects of easy cleaning, easy separation, and low impurity content

Inactive Publication Date: 2014-10-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] 1. Using waste titanium Ti6Al4V as a soluble anode, it is prepared by electrolysis in an alkali metal oxide salt system (Gao Yupu, Guo Naiming, Rare Metals, 1997), and the titanium-aluminum alloy powder produced by this method alone contains Besides the very low aluminum content, the main disadvantage is that the aluminum content of different particle sizes is different, the smaller the particles, the higher the Han Liangliang, and with the increase of the anode recovery rate, the aluminum content increases, resulting in unstable aluminum content in the alloy powder, and Due to the refinement of aluminum grains, the particles are too fine and the oxygen content is unqualified, which cannot meet the requirements for manufacturing structural parts
However, this method adopts the method of separately refining and alloying titanium and aluminum to produce metal powder, the alloying is not complete, the cathode product in the form of powder is not easy to separate, and it is easy to remain in the molten salt, and the salt inclusion rate of the product is extremely high

Method used

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Effect test

preparation example Construction

[0020] In the preparation method of the titanium-aluminum alloy of the present invention, titanium is used as an anode and liquid aluminum is used as a cathode, and electrolysis is carried out in a molten salt electrolyte to prepare the titanium-aluminum alloy.

[0021] Wherein, in order to make the titanium ions in the molten salt have the driving force of the concentration difference of the reaction, the molten salt electrolyte is composed of the main molten salt NaCl-KCl and the soluble titanium salt; by mass ratio, NaCl-KCl:soluble titanium salt=100: 1-10; preferably NaCl-KCl:soluble titanium salt=100:1-5; the weight of soluble titanium salt is based on the mass of titanium therein.

[0022] Among them, in NaCl-KCl, by weight ratio, NaCl:KCl=70-90:100-120; preferably NaCl:KCl=75-85:100-105.

[0023] Further, as a preferred option, the soluble titanium salt is TiCl X and at least one of titanate, 2≤X≤4, the titanate is at least one of calcium titanate, iron titanate and so...

Embodiment 1

[0030] Take 80g of aluminum block and place it on the bottom of the graphite crucible as the liquid cathode. The graphite crucible is placed in an insulated alumina crucible, and then placed in a stainless steel reactor, with the graphite crucible as the cathode. Place the prepared NaCl-KCl (add 3% TiCl 2 ) as the molten salt system of the whole reaction, wherein, by weight ratio, NaCl:KCl=78:100. Take 50g waste titanium plate (the actual reaction is 20g) as a soluble anode for electrolysis.

[0031] At 750°C, the aluminum at the bottom of the graphite crucible has become liquid and melted, and a current of 3A is applied, and the titanium ions dissolved from the anode and the cathode aluminum form an alloy TiAl 3 . After the reaction is completed, the entire crucible is soaked in 0.5% dilute HCl to remove the molten salt, and the product taken out is washed with 50% alcohol and vacuum-dried to obtain 115g of titanium-aluminum alloy powder.

[0032] It is determined that th...

Embodiment 2

[0034] Get 125g aluminum piece and be placed on the bottom of graphite crucible, as liquid cathode. The graphite crucible is placed in an insulated alumina crucible, and then placed in a stainless steel reactor, with the graphite crucible as the cathode. The prepared NaCl-KCl (with 5% sodium fluotitanate added) was placed in the graphite crucible as the molten salt system for the whole reaction, wherein, by weight ratio, NaCl:KCl=70:100. Take 70g titanium sponge as a soluble anode for electrolysis.

[0035] At 730°C, the aluminum at the bottom of the graphite crucible has become liquid and melted, and a current of 5A is applied, and the titanium ions dissolved from the anode and the cathode aluminum form an alloy TiAl 3 . After the reaction is completed, the entire crucible is soaked in 0.5% dilute HCl to remove the molten salt, and the product taken out is washed with 50% alcohol and vacuum-dried to obtain 178g of titanium-aluminum alloy powder.

[0036] It was determined ...

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Abstract

The invention relates to a preparation method for titanium-aluminium alloy, belongs to the field of alloys and aims to solve the technical problem of providing the preparation method for the titanium-aluminium alloy. The preparation method comprises the following steps: titanium serves as an anode and liquid aluminium serves as a cathode and then titanium and liquid aluminium are electrolyzed in a fused salt electrolyte to prepare the titanium-aluminium alloy, wherein the fused salt electrolyte comprises the main body fused salt NaCl-KCl and soluble titanium salt; the mass ratio of the NaCl-KCl to the soluble titanium salt in the fused salt electrolyte is 100 to 1-10; the weight of the soluble titanium salt is measured by the weight of titanium. According to the preparation method for the titanium-aluminium alloy, as liquid aluminium is adopted to serve as the cathode and is alloyed in a smelting state, the alloyed titanium aluminium alloy sinks at the bottom of a crucible and is easy to separate; the obtained titanium-aluminium alloy products are spongy and easy to wash, the impurity content is less and the follow-up processing is facilitated.

Description

technical field [0001] The invention relates to a preparation method of titanium-aluminum alloy, belonging to the field of alloys. Background technique [0002] Titanium alloy has low density, high specific strength, good corrosion resistance, high temperature creep resistance and welding performance, and excellent biocompatibility. It is widely used in aerospace, navigation, chemical industry, power generation, automobile, sports and leisure, medical treatment and other fields. [0003] There are several types of titanium alloys produced by molten salt electrolysis: [0004] 1. Using waste titanium Ti6Al4V as a soluble anode, it is prepared by electrolysis in an alkali metal oxide salt system (Gao Yupu, Guo Naiming, Rare Metals, 1997), and the titanium-aluminum alloy powder produced by this method alone contains Besides the very low aluminum content, the main disadvantage is that the aluminum content of different particle sizes is different, the smaller the particles, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36C22C21/00
Inventor 闫蓓蕾何安西穆天柱穆宏波邓斌赵三超陈兵朱福兴彭卫星
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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