TiAl coating capable of improving high-temperature oxidation resistance of titanium alloy and preparation method of TiAl coating

A high-temperature oxidation-resistant, titanium alloy technology, applied in metal material coating process, coating, ion implantation plating, etc., can solve the problems of limited activation of Al, achieve excellent oxidation resistance, improve bonding strength, and the method is simple Efficient effect

Active Publication Date: 2021-11-16
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a different TiAl coating and its preparation method for the problem that Al activation is limited due to the easy combination of solid-solution F atoms and Ti in the F-modified TiAl coating, specifically comprising an α- AlF 3 Nanoparticle modified TiAl coating and its dual-target magnetron sputtering deposition technology, with α-AlF 3 Nanoparticles replace solid-solution F atoms as the fluorine source, and the obtained coating makes the titanium alloy substrate still have excellent oxidation resistance at 670 °C

Method used

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  • TiAl coating capable of improving high-temperature oxidation resistance of titanium alloy and preparation method of TiAl coating
  • TiAl coating capable of improving high-temperature oxidation resistance of titanium alloy and preparation method of TiAl coating
  • TiAl coating capable of improving high-temperature oxidation resistance of titanium alloy and preparation method of TiAl coating

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Target preparation:

[0037] Alloying elements are distributed according to the following composition: Al: 40at.%; Ti: balance (all particle size is 44μm), the above powder is mixed in a ball mill tank at a speed of 110r / min for 6h, and then pressed into φ20×3mm by hot isostatic pressing machine 3 TiAl target material, the holding temperature is 1250°C, the isostatic pressure is 160MPa, and the holding pressure is 3h. High-purity α-AlF 3 Ceramic powder (particle size 37μm) is dried and pressed into φ20×3mm by hot isostatic press 3 α-AlF 3 For the target material, the holding temperature is 1750°C, the heat isostatic pressure is 160MPa, and the heat preservation and pressure holding are for 2h.

[0038] (2) Coating preparation:

[0039] The prepared TiAl target and α-AlF 3 The target is installed on the magnetron coating instrument, and the Ti60 titanium alloy substrate after the surface pretreatment (polished with 800# and 1500# sandpaper in sequence, followed ...

Embodiment 2

[0052] Same as Example 1, the difference is that α-AlF 3 The power supply of the target was 0.18 kW.

[0053] The measured coating thickness is 12.4 μm, and the matrix phase Al content in the coating is about 38.7 at.%, AlF 3 The content of nanoparticles is about 25.4vol.% (converted F atom content is 12.1 at.%). Coat the surface of the sample except the coating with high-temperature oxidation-resistant coating, weigh it after drying, then place it in a high-temperature tube furnace, keep it warm at 670°C for 500 hours, and then air-cool it to room temperature. Observe the sample, and the coating has no peeling off , and weighed to obtain the oxidation weight gain per unit area of ​​the coating to be 0.05mg / cm 2 .

Embodiment 3

[0055] Same as Example 1, the difference lies in that the power supply of the TiAl target is 0.6kW.

[0056] The measured coating thickness is 7.3 μm, and the matrix phase Al content in the coating is about 38.4 at.%, AlF 3 The nanoparticle content is about 28.4 vol.%. Coat the surface of the sample except the coating with high-temperature oxidation-resistant coating, weigh it after drying, then place it in a high-temperature tube furnace, keep it warm at 670°C for 500 hours, and then air-cool it to room temperature. Observe the sample, and the coating has no peeling off , and weighed to get the oxidation weight gain per unit area of ​​the coating to be 0.09mg / cm 2 .

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Abstract

The invention discloses a TiAl coating capable of improving the high-temperature oxidation resistance of a titanium alloy and a preparation method of the TiAl coating. The TiAl coating comprises alpha-AlF3 nanoparticles, and the content of the alpha-AlF3 nanoparticles accounts for 5 to 30 vol. percent of the TiAl coating. According to the preparation method of the TiAl coating, a TiAl alloy target material and an alpha-AlF3 target material serve as raw materials, and magnetron sputtering deposition is conducted on the surface of a base material to prepare the coating; the magnetron sputtering is double-target co-sputtering, the base material temperature during sputtering is 150 DEG C, the TiAl alloy target material adopts direct current sputtering, the power is 0.5 to 2 kW, the alpha-AlF3 target material adopts radio frequency sputtering, and the power is 0.07 to 0.2 kW; and after the coating is obtained through double-target co-sputtering, heat treatment is conducted on the obtained coating at 600 to 800 DEG C for 5 to 20 hours to obtain a final coating.

Description

technical field [0001] The invention belongs to the technical field of high-temperature protection of titanium alloys, and in particular relates to a TiAl coating capable of improving the high-temperature oxidation resistance of titanium alloys and a preparation method thereof. Background technique [0002] High-temperature oxidation resistance is an important challenge for titanium alloy components to maintain long-term stable service in aero-engines. At present, 600°C is still the limit service temperature of solid-solution-strengthened titanium alloys. TiAl coating has an important application prospect in the anti-oxidation protection of titanium alloy surface due to its similar composition and small difference in thermal expansion coefficient with titanium alloy. However, as the power system indicators of the new generation of aero-engines tend to be extreme, the high-temperature oxidation resistance of TiAl coatings needs to be further improved. [0003] Increasing the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/35C23C14/58C23C14/02
CPCC23C14/165C23C14/3414C23C14/3464C23C14/35C23C14/5806C23C14/028C22C14/00C23C14/06C23C14/0688B22F3/15C22C1/047C22C1/0458C22C32/0089Y10T428/12139B22F2301/052B22F2301/205B22F2302/45C23C14/14C23C14/352
Inventor 欧阳佩旋张淑婷孙伟杨谨赫董志超李航吴艳
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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