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Titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating and preparation method thereof

A high-temperature oxidation-resistant, titanium-aluminum alloy technology, used in chemical instruments and methods, metal material coating processes, coatings, etc. Parts, plasma liquid are expensive and other problems, to achieve the effect of improving high temperature oxidation resistance and thermal corrosion resistance, excellent oxidation resistance and thermal corrosion resistance, and excellent thermal shock resistance

Inactive Publication Date: 2015-07-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sun Chao, Wu Duoli, Jiang Sumeng et al prepared an Al-Cr coating on the surface of the nickel-based superalloy DSM11 substrate by using the combined process of arc ion plating deposition of Cr and powder embedding method to infiltrate Al, which significantly improved the high temperature oxidation resistance of the substrate alloy , but this method cannot accurately control the content of Al and Cr in the coating
Ling Guoping and Li Wenchuan of Zhejiang University used ionic liquid plating to prepare Al-Cr alloy coatings on the surface of steel, which can improve the resistance of substrates to high temperature oxidation, water gas corrosion and sulfur-containing medium corrosion. The disadvantage is that plasma liquid is expensive
M and D uses PVD method to prepare Al / Cr, Al / Fe and Cr / Fe composite coatings, but it is not suitable for large or complex parts
Moreover, the coating prepared by the above method is easy to peel off under high temperature and cyclic stress and lose its protective effect.
In summary, the research and application of Al-Cr coatings have made some achievements, but overall it is far from reaching a mature level.

Method used

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  • Titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating and preparation method thereof
  • Titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating and preparation method thereof
  • Titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating and preparation method thereof

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preparation example Construction

[0035] The preparation method of the above-mentioned high-temperature oxidation-resistant and heat-corrosion-resistant Al-Cr coating on the surface of the titanium-aluminum alloy includes first preparing a Cr diffusion layer on the surface of the titanium-aluminum alloy substrate, and then performing an aluminizing treatment on the surface of the Cr diffusion layer to prepare an Al-Cr alloy layer and rich Al deposition layer, the steps are as follows:

[0036] Step 1. Put the titanium-aluminum alloy substrate and the pure Cr target into the arc glow plasma surface metallurgy device, use the titanium-aluminum alloy substrate as the workpiece electrode, and use the pure Cr target as the source electrode; wherein, the pure Cr target The purity of Cr is 99.999wt%.

[0037] Step 2. Vacuumize to 5×10 -4 Pa~8×10 -4 Pa, send argon gas, start glow, and debug process parameters are: arc current: 50-70A; workpiece bias voltage: 250-350V; argon gas pressure: 0.3-0.5Pa; distance between ...

Embodiment 1

[0045] 1) O-Ti 2 AlNb-based alloys and pure Cr targets were loaded into an arc-added glow plasma surface metallurgy device, and O-Ti 2 The AlNb-based alloy is used as the workpiece electrode, and the pure Cr target is used as the source electrode. The purity of Cr in the target is 99.999%;

[0046] 2) Vacuum to 5×10 -4 Pa, send argon gas, start glow, and debug process parameters are: arc current: 50A; workpiece bias voltage: 250V; argon gas pressure: 0.3Pa; target and workpiece distance: 180mm; duty ratio: 0.2; holding time : 0.5h; Working temperature: 880~920℃;

[0047] 3) Stop the glow, cut off the power, and complete the preparation of the Cr diffusion layer;

[0048] 4) Put the sample prepared by the Cr diffusion layer and the pure Al target into the arc glow plasma surface metallurgy device, take the sample prepared by the Cr diffusion layer as the workpiece electrode, and use the pure Al target as the source electrode; , the purity of Al in the pure Al target materi...

Embodiment 2

[0054] 1) Put the γ-TiAl alloy and the pure Cr target into the arc glow plasma surface metallurgy device, use the γ-TiAl alloy as the workpiece electrode, and use the pure Cr target as the source. The purity of Cr in the target is 99.999%;

[0055] 2) Vacuum to 8×10 -4 P, send argon gas, start glow, and debug process parameters are: arc current: 50A; workpiece bias voltage: 350V; argon gas pressure: 0.5Pa; distance between target and workpiece: 150mm; duty cycle: 0.2; : 0.5h; Working temperature: 880~920℃;

[0056] 3) Stop the glow, cut off the power, and complete the preparation of the Cr diffusion layer;

[0057] 4) Put the sample prepared by the Cr diffusion layer and the pure Al target into the arc glow plasma surface metallurgy device, the sample prepared by the Cr diffusion layer is used as the workpiece electrode, and the pure Al target is used as the source electrode; , the purity of Al in the pure Al target material is 99.999wt%.

[0058] 5) Vacuum to 8×10 -4 P, ...

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Abstract

The present invention discloses a titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; an Al-rich deposition layer, an Al-Cr alloy layer and a Cr diffusion layer are successively arranged from surface to a titanium aluminum alloy substrate. The content of Al in the Al-rich deposition layer remains the same. The content of Al in the Al-Cr alloy layer gradually reduces outside-to-inside to 70%-100% of the content of Al in the titanium aluminum alloy substrate, and the rest in the Al-Cr alloy layer is Cr. The contents of Cr and Al in the Cr diffusion layer respectively gradually reduces outside-to-inside to same as the contents of Cr and Al in the titanium aluminum alloy substrate, and the rest in the Cr diffusion layer is other elements in the titanium aluminum alloy substrate, and the contents of other elements in the Cr diffusion layer respectively gradually rise to same as the contents of the other elements in the titanium aluminum alloy substrate from zero. The invention also discloses a preparation method of the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating can give titanium aluminum alloy excellent oxidation resistance and heat resistance corrosion performance under high temperature and long term service conditions, and due to the presence of the diffusion layer of the gradient components, the reliable binding strength and excellent thermal shock resistance can be realized.

Description

technical field [0001] The invention relates to the technical field of high-temperature oxidation-resistant and heat-corrosion-resistant coatings, in particular to an Al-Cr coating on the surface of a titanium-aluminum alloy that is resistant to high-temperature oxidation and heat-corrosion and a preparation method thereof. Background technique [0002] Ti-Al intermetallic compound has high specific strength, and its high-temperature strength and rigidity are higher than Ni-based and Ti-based alloys. It is an ideal new high-temperature structural material for aviation and aerospace vehicles. However, titanium-aluminum alloy has defects such as poor thermal corrosion resistance and a sharp drop in oxidation resistance at high temperatures exceeding 650 °C, which limit its application and cannot meet the working requirements of hot-end components such as aero engines and gas turbines. In order to improve the high-temperature oxidation and hot corrosion resistance of titanium-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C23C14/16C23C14/32
Inventor 梁文萍任蓓蕾缪强潘晓扬刘文胡荣耀陆海峰夏金姣陈博文
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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