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A vacuum smelting method for titanium-aluminum intermetallic compound

An intermetallic compound and vacuum melting technology, applied in the field of material processing, can solve the problems of increased oxygen content, performance impact, and high reactivity of the melt, and achieve the effects of reducing contact, reducing the degree of reaction, and preventing entrainment and turbulence

Inactive Publication Date: 2018-09-14
QINGDAO R & D INST XIAN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the powder used in 3D printing is generally obtained by vacuum casting into ingots after smelting, followed by secondary smelting and atomization powder production. In the process of vacuum smelting and pouring, the purity of the alloy melt is guaranteed. For The product performance in the follow-up pulverization and even 3D printing process is very important. The vacuum melting currently used is generally through vacuum induction melting in the crucible of the induction furnace and then pouring. However, the titanium-aluminum intermetallic compound in the liquid state The reactivity is very high, it is easy to react with the alumina crucible, bring in inclusions and increase the oxygen content of the melt, which will affect the performance

Method used

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Embodiment Construction

[0018] The present invention will be further described below in combination with specific embodiments.

[0019] The selected alloy components include Al: 39-40%, Cr: 1.2-1.5-%, Nb: 1.6-1.8%, Si: 0.05-0.11%, Mo: 0.2-0.3%, V: 2.2- 2.8%, B: 0.03-0.04%, La: 0.02-0.04%, and the balance is Ti.

[0020] After converting the above components into mass percentages, select the corresponding mass parts of titanium sponge, use acetone to ultrasonically clean it for 10-15 minutes, cut the corresponding mass parts of Al blocks, polish off the surface oxide film, clean the surface oil, and mix the rest of the trace elements. Separately weighed for later use,

[0021] Put the titanium sponge and 1 / 4 of the aluminum block into the crucible of the vacuum induction melting furnace, there is a secondary feeding hopper above the crucible, the secondary feeding hopper includes two silos, put the rest of the aluminum blocks into the first feeding silo, and the remaining trace elements are put into...

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Abstract

The invention discloses a vacuum melting method for a titanium aluminum intermetallic compound. The vacuum melting method comprises the steps that raw materials are selected and added into a crucible and a secondary charging hopper respectively, a first inert gas pipe and a second inert gas pipe on the wall of the crucible are used for argon blowing after the raw materials are heated, different argon blowing moments and pressure are selected, the temperature in the crucible is ensured in the initial stage, the raw materials are molten rapidly, after the raw materials are molten completely, a gas curtain wall is guaranteed to be formed at the wall of the crucible and is prevented from reacting with the alloy liquid, after trace elements are added, the mixture is stirred to enable the trace elements to be mixed uniformly and molten, and the alloy liquid is enabled to be stable in the pouring process so as to prevent air entrapment and flow turbulence.

Description

technical field [0001] The invention belongs to the technical field of material processing, in particular to a vacuum melting method for titanium-aluminum intermetallic compounds. Background technique [0002] Titanium-aluminum intermetallic compounds have low density, high strength, high hardness, high temperature resistance, high corrosion resistance and friction resistance, especially TiAl intermetallic compounds because of their high specific strength, high specific stiffness, corrosion resistance and wear resistance. , high temperature resistance and excellent oxidation resistance, etc., are becoming one of the excellent candidate structural materials in the contemporary aerospace industry, civil industry and other fields, especially in the field of aeroengine blades, which have broad application prospects. 3D printing, or additive manufacturing, is a rapid prototyping process that has emerged in recent years. It adopts layer-by-layer powder coating, laser or electron b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22B9/04
CPCC22B9/04C22C1/02Y02P10/25
Inventor 张建勋余钊辉刘喜候晓翠
Owner QINGDAO R & D INST XIAN JIAOTONG UNIV