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Smelting preparation method of large-sized titanium-aluminum intermetallic ingot

An intermetallic compound and large-scale technology, applied in the metallurgy field of metal alloy materials, can solve problems such as high-density inclusions, composition segregation, etc., and achieve the effects of avoiding pollution, uniform composition, and high purity

Active Publication Date: 2015-03-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies in the above-mentioned prior art and provides a method for smelting and preparing a large-size titanium-aluminum intermetallic compound ingot, the purpose of which is to realize the smelting and preparation of a large-size titanium-aluminum intermetallic compound ingot , to solve the problems of serious composition segregation, high-density inclusions, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The prepared titanium-aluminum intermetallic compound ingot is a TiAl alloy, and the equipment adopts a 20 kg water-cooled copper tongs pot vacuum induction melting furnace. The steps of the method are as follows:

[0032] ⑴ called branch

[0033] According to the composition ratio of the titanium-aluminum intermetallic compound, weigh 7.04kg of titanium sponge, 3.88kg of aluminum beans, 0.76kg of AlNb75 alloy particles, and 0.32kg of chromium powder;

[0034] The purity of titanium sponge is grade A;

[0035] The mass fraction of pure aluminum in aluminum beans or aluminum blocks is not less than 99.99%;

[0036] ⑵Furnace loading

[0037] Put the large-size ingot ingot mold with a diameter of 220mm and a height of 500mm into the furnace pouring position, then put the solidification shell in the crucible, and then put the raw materials in step (1) into the crucible;

[0038] (3) After closing the furnace door, the vacuum degree reaches 2Pa, and backfills with argon t...

Embodiment 2

[0045] The prepared titanium-aluminum intermetallic compound ingot is Ti3Al alloy, and the equipment adopts a 20 kg water-cooled copper tongs pot vacuum induction melting furnace. The steps of the method are as follows:

[0046] ⑴ called branch

[0047] According to the composition ratio of the titanium-aluminum intermetallic compound, weigh 5.67kg of titanium sponge, 1.12kg of aluminum block, 2.77kg of niobium block, 0.37kg of AlMo50 alloy particles, and 0.15kg of AlV50 alloy particles;

[0048] The purity of sponge titanium is 0A grade;

[0049] The mass fraction of pure aluminum in aluminum beans or aluminum blocks is not less than 99.99%;

[0050] ⑵Furnace loading

[0051] Put the large-size ingot ingot mold with a diameter of 220mm and a height of 500mm into the furnace pouring position, then put the solidification shell in the crucible, and then put the raw materials in step (1) into the crucible;

[0052] (3) After closing the furnace door, evacuate to 10Pa, then bac...

Embodiment 3

[0059]The prepared titanium-aluminum intermetallic compound ingot is Ti2AlNb alloy, and the equipment adopts a 20 kg water-cooled copper tongs pot vacuum induction melting furnace. The steps of the method are as follows:

[0060] ⑴ called branch

[0061] According to the composition ratio of the titanium-aluminum intermetallic compound, 4.64kg of titanium sponge, 1.11kg of aluminum block, and 4.25kg of niobium scrap were weighed;

[0062] The purity of sponge titanium is 0A grade;

[0063] The mass fraction of pure aluminum in aluminum beans or aluminum blocks is not less than 99.99%;

[0064] ⑵Furnace loading

[0065] Put the large-size ingot ingot mold with a diameter of 220mm and a height of 500mm into the furnace pouring position, then put the solidification shell in the crucible, and then put the raw materials in step (1) into the crucible;

[0066] (3) After closing the furnace door, the vacuum degree reaches 10Pa, and the argon gas is backfilled to 5000Pa for melting...

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Abstract

The invention provides a smelting preparation method of a large-sized titanium-aluminum intermetallic ingot. The method comprises the following steps: smelting raw materials in a cold crucible vacuum induction suspension smelting furnace for multiple times; repeatedly pouring into a relatively large-sized ingot mold; and connecting by means of the diffusion effect between liquid-state molten metal and solidified alloy in the ingot mold to obtain a large-sized ingot. According to the method, an induction suspension smelting technology is sufficiently utilized to prepare the alloy with uniform ingredients and high purity; the limitation of the induction suspension smelting technology for volumes of raw materials can be overcome, and the large-sized alloy ingot can be prepared by utilizing the diffusion effect between high-temperature liquid-state metal and solid-state metal; molten metal is diluted in the large-diameter ingot mold by means of multiple times of small-amount repeated pouring and is uniformly contracted in the cooling process, so that occurrence of large-sized sinkholes can be avoided. The method is an optimal choice for smelting preparation of large-sized titanium-aluminum intermetallic ingots.

Description

technical field [0001] The invention relates to a method for smelting and preparing a large-size titanium-aluminum intermetallic compound ingot, belonging to the metallurgy field of metal alloy materials. Background technique [0002] Titanium-aluminum intermetallic compounds have the advantages of high strength, light weight, good oxidation resistance, and high-temperature mechanical properties. They are used in aero-engines and aircraft parts, which can effectively reduce the structural weight of aircraft, improve aircraft endurance and flight speed, and at the same time It can also improve fuel efficiency and reduce flight costs, and has great application prospects. [0003] However, due to the large difference in melting point and density of titanium, aluminum and other elements in the titanium-aluminum intermetallic compound, and the short holding time after the electrode material is melted, the high-melting point metal elements cannot be melted in time and cannot be se...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C14/00C22C30/00
Inventor 朱郎平南海李建崇黄东赵嘉琪
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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