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ti 2 Alnb alloy surface anti-high temperature oxidation composite gradient coating and preparation method thereof

A technology of anti-high temperature oxidation and gradient coating, which is applied in the direction of chemical instruments and methods, metal material coating technology, coating, etc., can solve the problems of poor high temperature oxidation resistance, etc., and achieve strong anti-oxidation ability, uniform and dense structure, high efficiency effect

Active Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For Ti 2 The characteristics of poor high-temperature oxidation resistance of AlNb alloys and the problems existing in the prior art, the present invention utilizes arc-added glow plasma surface metallurgy technology to provide a Ti 2 Composite gradient coating for anti-high temperature oxidation on the surface of AlNb alloy and its preparation method, the metallurgical bond without interface is formed between the coating and the substrate, and its composition, structure and performance are all gradient changes from the surface to the inside, so that the coating can be made It has sufficient and reliable bonding strength with the matrix, greatly improving Ti 2 High Temperature Oxidation Resistance of AlNb Alloy

Method used

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  • ti <sub>2</sub> Alnb alloy surface anti-high temperature oxidation composite gradient coating and preparation method thereof

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Experimental program
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Embodiment 1

[0031] 1) Put Ti 2 AlNb-based alloy and Al-Ti alloy targets are put into the arc glow plasma surface alloying device, and Ti 2 The AlNb-based alloy is used as the workpiece electrode, and the Al-Ti alloy target is used as the source electrode. The composition ratio of the Al-Ti alloy target material is: Al accounts for 75wt%, and Ti accounts for 25wt%.

[0032] 2) Evacuate to the ultimate vacuum, feed argon gas, start glow, and debug process parameters are: arc current: 20 A; workpiece bias voltage: 250 V; argon gas pressure: 0.3 Pa; distance between target and workpiece: 200 mm; Duty cycle: 0.2; Holding time: 0.5 h; Working temperature: 840~880℃;

[0033] 3) Stop the glow, cut off the power, and complete the preparation of the Al-Ti infiltrated layer in the middle layer;

[0034] 4) Put the prepared Al-Ti infiltrated layer sample and pure Al alloy target into the arc glow plasma surface alloying device, use the Al-Ti infiltrated layer sample as the workpiece electrode, and...

Embodiment 2

[0041] 1) Put Ti 2 AlNb-based alloy and Al-Ti alloy targets are put into the arc glow plasma surface alloying device, and Ti 2 The AlNb-based alloy is used as the workpiece electrode, and the Al-Ti alloy target is used as the source electrode. The composition ratio of the Al-Ti alloy target material is: Al accounts for 55wt%, and Ti accounts for 45wt%.

[0042] 2) Evacuate to the ultimate vacuum, feed argon gas, start glow, and debug process parameters are: arc current: 30 A; workpiece bias voltage: 350 V; argon gas pressure: 0.5 Pa; distance between target and workpiece: 150 mm; Duty cycle: 0.2; Holding time: 0.5 h; Working temperature: 840~880℃;

[0043] 3) Stop the glow, cut off the power, and complete the preparation of the Al-Ti infiltrated layer in the middle layer;

[0044] 4) Put the prepared Al-Ti infiltrated layer sample and pure Al alloy target into the arc glow plasma surface alloying device, use the Al-Ti infiltrated layer sample as the workpiece electrode, and...

Embodiment 3

[0050] Except following content, all the other are identical with embodiment 1 content:

[0051] Step 1) The composition ratio of the Al-Ti alloy target material is: Al accounts for 45wt%, and Ti accounts for 55wt%.

[0052] The debugging process parameters of step 2) are: arc current: 35A; workpiece bias voltage: 300V; argon gas pressure: 0.4Pa; distance between target and workpiece: 170mm; duty cycle: 0.5; holding time: 1h; working temperature: 840 ~880°C;

[0053] Step 5) Vacuumize to the ultimate vacuum, feed in argon, start the glow, and debug the process parameters as follows: arc current: 35A; workpiece bias: 300 V; argon pressure: 0.4Pa; distance between the target and the workpiece: 170 mm; Duty cycle: 0.2; Holding time: 0.5h; Working temperature: 840~880℃.

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Abstract

The invention relates to a high-temperature oxidation-resistant composite gradient coating on the surface of a Ti2AlNb alloy and a preparation method thereof. The composite gradient coating consists of a pure Al layer, an Al-Ti alloy layer and an Al-Ti-Nb interdiffusion layer in sequence from the surface to a substrate. The Al content of the Al-Ti alloy layer gradually decreases from the surface of the Al-Ti infiltrated layer from the outside to the inside, and the Ti content increases slowly without a sudden change in composition; the Al content of the Al-Ti-Nb interdiffusion layer has a gradient from the outside to the inside of the diffusion layer surface The content of Ti and Nb increases from the surface of the diffusion layer from the outside to the inside. The preparation method is to use the Ti2AlNb-based alloy as the workpiece electrode, and the Al-Ti alloy target as the source, and use the arc glow plasma surface metallurgy technology to prepare the Al-Ti alloy layer, and then use the pure Al target as the source. ‑Ti alloy layer prepared pure Al layer. The process efficiency is high, the preparation process is simple, and the obtained coating has strong oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of high temperature oxidation resistant coatings, in particular to a Ti 2 High-temperature oxidation-resistant composite coating on the surface of AlNb-based alloy and its preparation method. Background technique [0002] Ti 2 AlNb-based alloy is a newly developed alloy system in Ti-Al intermetallic compound alloy, which is based on Ti 3 It is formed by adding β-stabilizing element Nb to Al. Because Ti 2 AlNb-based alloys have high high-temperature yield strength, high creep resistance and fracture toughness, and low notch sensitivity, showing great potential as a new generation of high-temperature structural materials. However Ti 2 AlNb alloy also has some defects in performance, which limits its application, and the most prominent problem is that the high temperature oxidation resistance is seriously insufficient. At high temperatures exceeding 700 °C, Ti 2 The oxidation resistance of AlNb-based all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/38C23C14/14C23C10/48C23C28/02B32B15/01
Inventor 缪强任蓓蕾梁文萍王力夏金姣蒋穹徐一
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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