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High-temperature-oxidation-resistant and abrasion-resistant AlCrN coating on surface of titanium-aluminum alloy and preparation method thereof

A high-temperature oxidation resistance, titanium-aluminum alloy technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of low bonding strength, low deposition rate, low friction coefficient, etc., to achieve anti-oxidation ability Strong, to achieve the effect of uniform and dense coating composition and organization

Inactive Publication Date: 2016-08-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

Wang Saiyu from Hubei Institute of Technology deposited a TiAlCrN coating on a Ti(C,N)-based cermet substrate by arc ion plating, which significantly improved the high-temperature oxidation resistance of the substrate alloy, but this method could not accurately control the Al in the coating. , Cr content, and the thickness is small, which cannot effectively protect the substrate for a long time; the patent application number 201010597416.8 discloses a high hardness and high elastic modulus CrAlN protective coating and its preparation method, which is obtained by radio frequency reactive sputtering method The inner layer is a Cr transition layer, and the outer layer is a CrAlN dense ceramic layer, which has high resistance to high temperature oxidation and excellent corrosion resistance. The disadvantage is that it is not suitable for large parts or parts with complex shapes; A kind of multi-layer AlCrN cutting tool coating and preparation method thereof, it adopts multi-arc ion plating to prepare the multi-layer structure of Cr / CrN / AlCrN on the surface of the tool substrate, the friction coefficient is as low as 0.3, and the tool life is improved by more than 5 times. Everywhere is complex
The coating prepared by the above method has problems such as large residual stress value, low bonding strength, low deposition rate, and complicated process, which limit its industrial application.
[0005] To sum up, the research and application of AlCrN coatings have made some achievements, but overall it is far from reaching a mature level.

Method used

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  • High-temperature-oxidation-resistant and abrasion-resistant AlCrN coating on surface of titanium-aluminum alloy and preparation method thereof
  • High-temperature-oxidation-resistant and abrasion-resistant AlCrN coating on surface of titanium-aluminum alloy and preparation method thereof
  • High-temperature-oxidation-resistant and abrasion-resistant AlCrN coating on surface of titanium-aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, a high-temperature oxidation-resistant and wear-resistant AlCrN coating on the surface of a titanium-aluminum alloy is deposited on the surface of a titanium-aluminum alloy workpiece using double-glow plasma surface technology. The surface of the coating is an AlCrN deposition layer with a thickness of 7 microns. form dense Al-rich 2 o 3 and Cr oxide oxide layer; inside the coating is an AlCrN diffusion layer with a thickness of 12 microns.

[0036] Al-rich deposits form dense Al at high temperature 2 o 3 The oxide film prevents the matrix from being further oxidized, and solves the problem of poor oxidation resistance of the γ-TiAl alloy at high temperatures above 700°C. The internal AlCrN diffusion layer has no compositional mutation, and it is not easy to produce microcracks under the strong thermal shock of the hot end of the engine, so the reliability is high; the diffusion layer is metallurgically bonded to the substrate, and the bon...

Embodiment 2

[0047] A high-temperature oxidation-resistant and wear-resistant AlCrN coating on the surface of a titanium-aluminum alloy is deposited on the surface of a titanium-aluminum alloy workpiece using double-glow plasma surface technology. The surface of the coating is an AlCrN deposition layer with a thickness of 8 microns, which forms a dense Rich Al 2 o 3 and Cr oxide oxide layer; inside the coating is an AlCrN diffusion layer with a thickness of 13 microns.

[0048] The preparation method comprises the following steps:

[0049] (1) Furnace loading: put the γ-TiAl workpiece and the AlCr target into the double-glow plasma surface alloying furnace, use the γ-TiAl workpiece as the workpiece electrode, and the AlCr target as the source electrode, and the distance between the source electrode and the workpiece electrode is 10mm , the composition ratio of the AlCr target is: Al accounts for 50wt%, and the balance is Cr;

[0050] (2) Vacuuming: Close the furnace body and the air inl...

Embodiment 3

[0057] A high-temperature oxidation-resistant and wear-resistant AlCrN coating on the surface of a titanium-aluminum alloy is deposited on the surface of a titanium-aluminum alloy workpiece using double-glow plasma surface technology. The surface of the coating is an AlCrN deposition layer with a thickness of 10 microns, which forms a dense Rich Al 2 o 3 and Cr oxide oxide layer; inside the coating is an AlCrN diffusion layer with a thickness of 15 microns.

[0058] The preparation method comprises the following steps:

[0059] (1) Furnace loading: Ti 2 AlNb-based alloy workpieces and AlCr targets were loaded into a double-glow plasma surface alloying furnace, and Ti 2 The AlNb-based alloy workpiece is the workpiece electrode, the AlCr target is the source electrode, the distance between the source electrode and the workpiece electrode is 50mm, and the composition ratio of the AlCr target material is: Al accounts for 80wt%, and the balance is Cr;

[0060] (2) Vacuuming: Cl...

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Abstract

The invention discloses a high-temperature-oxidation-resistant and abrasion-resistant AlCrN coating on the surface of a titanium-aluminum alloy and a preparation method thereof. The coating is deposited on the surface of a titanium-aluminum alloy workpiece through the double glow plasma surface technology, an AlCrN deposited layer is located on the surface of the coating and is 5-10 micrometers thick, and a compact oxidized layer rich in Al2O3 and Cr oxide is formed by the AlCrN deposited layer at a high temperature; an AlCrN diffused layer is arranged in the coating and is 12-15 micrometers thick; the hardness of the obtained coating is 30-37 GPa, the room temperature friction coefficient of the coating is 0.3-0.33, and the high-temperature friction coefficient of the coating is 0.47-0.49. The preparation method includes the steps of charging, vacuumizing, workpiece surface activation, plasma permeation of the AlCrN coating, cooling and discharging. The obtained AlCrN coating solves the problem that the titanium-aluminum alloy is poor in high-temperature-oxidation resistance; meanwhile, the gradient structure of the diffused layer achieves metallurgical bonding of the coating and a substrate, and good high-temperature-oxidation resistance and good abrasion resistance are achieved.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a high-temperature oxidation-resistant and wear-resistant AlCrN coating on the surface of a titanium-aluminum alloy 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 also has some performance defects, which limits its application. At high temperatures exceeding 700 °C, the oxidation resistance of titanium-aluminum alloys drops sharply. Due to the infiltration of N and O atoms in the air at high temperatures, the alloy is prone to subsurface embrittlement, which leads to a great reduction in the mechanical properties of titanium-aluminum alloys such as thermal stability, durable str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02C23C14/32C23C14/06
CPCC23C12/02C23C14/0641C23C14/32
Inventor 梁文萍任蓓蕾缪强潘晓扬胡荣耀夏金姣陈博文裴邱旭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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