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Method for improving high-temperature oxidation resistance of Nb-Si-based multicomponent alloy

A high-temperature oxidation resistance and alloy technology, which is used in the field of improving the high-temperature oxidation resistance of Nb-Si-based multi-component alloys by using laser surface remelting technology, and improving the high-temperature oxidation resistance of ultra-high temperature alloys, can solve the problem of Nb-Si-based multi-component alloys. problems such as poor oxidative properties, to achieve the effects of simple preparation, improved short-term high-temperature oxidation resistance, and simple and practical methods

Inactive Publication Date: 2015-12-09
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is aimed at the problem of poor oxidation resistance of Nb-Si-based multi-component alloys under high temperature conditions, and provides a method for improving the high-temperature oxidation resistance of Nb-Si-based multi-component alloys under the premise of taking into account the mechanical properties

Method used

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  • Method for improving high-temperature oxidation resistance of Nb-Si-based multicomponent alloy
  • Method for improving high-temperature oxidation resistance of Nb-Si-based multicomponent alloy

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Embodiment 1

[0035] Use laser surface remelting technology to improve the high temperature oxidation resistance of Nb-Si based multi-component alloys. The laser melting system used mainly includes: Nd-YAG laser, computer system and argon atmosphere protection device. The steps are as follows:

[0036] 1. Using Nb, Si, Ti, Cr, Al, Hf as synthetic raw materials, using vacuum non-consumable arc melting technology to obtain Nb-16Si-24Ti-2Cr-2Al-2Hf alloy master ingot, using wire cutting to cut samples, Polish the surface of the sample, clean it and dry it for later use;

[0037] 2. Fix the Nb-16Si-24Ti-2Cr-2Al-2Hf alloy sample on the workbench, first evacuate the sealed forming cavity into a vacuum state, and then fill it with high-purity argon (99.99%) for protection;

[0038] 3. The laser beam performs preheating scanning on the surface of the Nb-16Si-24Ti-2Cr-2Al-2Hf alloy sample according to the preset scanning path and parameters. The specific preheating parameters: laser power 300W, scan...

Embodiment 2

[0046] Use laser surface remelting technology to improve high temperature oxidation resistance of Nb-Si based multi-component alloys. The laser melting system used mainly includes: Nd-YAG laser, computer system and argon atmosphere protection device. The steps are as follows:

[0047] 1. Using Nb, Si, Ti, Cr, Al, Hf as synthetic raw materials, using vacuum non-consumable arc melting technology to obtain Nb-20Si-24Ti-2Cr-2Al-2Hf alloy master ingot, using wire cutting to cut samples, Polish the surface of the sample, clean it and dry it for later use;

[0048] 2. Fix the Nb-20Si-24Ti-2Cr-2Al-2Hf alloy sample on the workbench, first evacuate the sealed forming cavity into a vacuum state, and then fill it with high-purity argon (99.99%) for protection;

[0049] 3. The laser beam preheats and scans the surface of the Nb-20Si-24Ti-2Cr-2Al-2Hf alloy sample according to the preset scanning path and parameters. The specific preheating parameters: laser power 300W, scanning speed 1800mm...

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Abstract

The invention discloses a method for improving the high-temperature oxidation resistance of Nb-Si-based multicomponent alloy and belongs to the field of ultrahigh-temperature alloy materials. According to the method, high-energy laser beams are made to act on the surface of an Nb-Si-based multicomponent alloy sample under the protection of argon gas by means of a laser melting device by conducting preheating and setting melting technological parameters reasonably, so that the surface of the alloy is molten and solidified rapidly, and a surface remelting layer with fine, a uniform and compact structure is formed, and thus the high-temperature oxidation resistance of the Nb-Si-based multicomponent alloy is improved by refining the structure. According to the method, the phenomenon that cracks are generated easily in the rapid solidification process of brittle alloy is avoided effectively by adding the preheating procedure; meanwhile, the surface remelting layer and a base body are combined in a metallurgy mode, falling is unlikely to happen when the alloy is in service, and the practicability is high.

Description

technical field [0001] The invention belongs to the field of ultra-high-temperature alloy materials, and relates to a method for improving the high-temperature oxidation resistance of ultra-high-temperature alloys, in particular to a method for improving the high-temperature oxidation resistance of Nb-Si-based multi-element alloys by using laser surface remelting technology. Background technique [0002] With the development of aero-vehicles towards the direction of long endurance, high speed, high airworthiness and high safety, the requirements for aero-engines are getting higher and higher, which is reflected in the specific indicators of the engines with higher thrust-to-weight ratios, longer Overhaul cycle. With the improvement of engine thrust-to-weight ratio and working efficiency, the performance requirements for the most core engine blade material also increase accordingly. At present, nickel-based alloys are widely used in aeroengine turbine blades, which have exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00
Inventor 贾丽娜张虎郭跃岭
Owner BEIHANG UNIV
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