Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-temperature oxidation-resistant and heat-corrosion-resistant Al-cr coating on the surface of a titanium-aluminum alloy and preparation method thereof

A high-temperature oxidation-resistant, titanium-aluminum alloy technology, applied in chemical instruments and methods, metal material coating technology, coatings, etc., can solve the problem that the content of Al and Cr in the coating cannot be accurately controlled, and it is not suitable for large pieces or complex shapes. Parts and plasma liquid are expensive, etc., 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: 2016-10-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF2 Cites 0 Cited by
  • 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
and Composite coatings of Al / Cr, Al / Fe and Cr / Fe are prepared by PVD method, but it is not suitable for large or complicated 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-temperature oxidation-resistant and heat-corrosion-resistant Al-cr coating on the surface of a titanium-aluminum alloy and preparation method thereof
  • High-temperature oxidation-resistant and heat-corrosion-resistant Al-cr coating on the surface of a titanium-aluminum alloy and preparation method thereof
  • High-temperature oxidation-resistant and heat-corrosion-resistant Al-cr coating on the surface of a titanium-aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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, 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...

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, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com