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High temperature oxidation resistant composite gradient coating on Ti2AlNb alloy surface and preparation method thereof

A technology of high temperature oxidation resistance and gradient coating, applied in chemical instruments and methods, metal material coating processes, coatings, etc., can solve the problems of poor high temperature oxidation resistance, etc. Efficient effect

Active Publication Date: 2015-02-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the characteristics of poor high temperature oxidation resistance of Ti2AlNb alloy and the problems existing in the prior art, the present invention utilizes arc glow Plasma surface metallurgy technology, providing a composite gradient coating on the surface of Ti2AlNb alloy that resists high temperature oxidation and its preparation method, forming a non-interfaced metallurgical bond between the coating and the substrate, its composition, structure The coating and performance are gradient changes from the surface to the inside, so that there is sufficient and reliable bonding strength between the coating and the substrate, and the high temperature oxidation resistance of Ti2AlNb alloy is greatly improved

Method used

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  • High temperature oxidation resistant composite gradient coating on Ti2AlNb alloy surface and preparation method thereof
  • High temperature oxidation resistant composite gradient coating on Ti2AlNb alloy surface and preparation method thereof
  • High temperature oxidation resistant composite gradient coating on Ti2AlNb alloy surface and preparation method thereof

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Experimental program
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Effect test

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 degree, feed argon gas, start glow, and debug process parameters are: arc current: 35 A; workpiece bias voltage: 300 V; argon gas pressure: 0.4Pa; distance between target and workpiece: 170 mm; duty cycle: 0.2; holding time: 0.5 h; working temperature: 840~880℃.

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Abstract

The invention relates to a high temperature oxidation resistant composite gradient coating on a Ti2AlNb alloy surface and a preparation method thereof. The composite gradient coating sequentially comprises a pure Al layer, an Al-Ti alloy layer and an Al-Ti-Nb mutual diffusion layer from the surface to a substrate; the Al content of the Al-Ti alloy layer is decreased in a slow gradient manner from the surface of an Al-Ti seeping layer from outside to inside, the Ti content is slowly increased, and component mutation is avoided; and Al content of the Al-Ti-Nb mutual diffusion layer is decreased in a gradient manner from the surface of a diffusion layer from outside to inside, and the Ti content and the Nb content are increased from outside to inside in a gradient manner from the surface of the diffusion layer. The preparation method comprises the steps as follows: Ti2AlNb base alloy is taken as a workpiece electrode, an Al-Ti alloy target material is taken as a source electrode, the Al-Ti alloy layer is prepared by adopting an arc-glow plasma surface metallurgy technology, and then a pure Al target material is taken as the source electrode to prepare the pure Al layer on the Al-Ti alloy layer. The technology efficiency is high, the preparation technology is simple, and the obtained coating has high 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/38C23C14/14C23C10/48C23C28/02B32B15/01
CPCC23C14/16C23C10/48C23C14/325C23C28/021C23C28/028
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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