A kind of high-temperature oxidation-resistant and wear-resistant Alcrn coating on the surface of titanium-aluminum alloy and preparation method thereof

A high-temperature oxidation-resistant, 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 friction coefficient, low deposition rate, etc., and achieve oxidation resistance Strong, uniform and dense structure, to achieve the effect of coating components

Inactive Publication Date: 2018-08-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Wang Saiyu et al. 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 content 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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  • A kind of high-temperature oxidation-resistant and wear-resistant Alcrn coating on the surface of titanium-aluminum alloy and preparation method thereof
  • A kind of high-temperature oxidation-resistant and wear-resistant Alcrn coating on the surface of titanium-aluminum alloy and preparation method thereof
  • A kind of high-temperature oxidation-resistant and wear-resistant Alcrn coating on the surface of titanium-aluminum alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0036] Aluminium-rich deposits form dense Al at high temperatures 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 sudden change in composition. Under the strong thermal shock such as the hot end of the engine, micro-cracks are not easily generated, so the reliability is high; the diffusion layer is metallurg...

Embodiment 2

[0047] An AlCrN coating with high temperature oxidation resistance and wear resistance on the surface of titanium aluminum alloy, which is deposited on the surface of titanium aluminum alloy workpiece by double-glow plasma surface technology. Al rich 2 O 3 and the oxide layer of Cr oxide; the inside of the coating is an AlCrN diffusion layer with a thickness of 13 microns.

[0048] The preparation method includes the following steps:

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

[0050] (2) Vacuuming: close the furnace body and the air inlet, open the cooling water, open the vacuum pump and vacuumize until the pressure in the fur...

Embodiment 3

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

[0058] The preparation method includes the following steps:

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

[0060] (2) Vacuuming: close the furnace...

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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 compounds have high specific strength, and their high-temperature strength and rigidity are higher than those of Ni-based and Ti-based alloys. They are ideal new high-temperature structural materials for aviation and aerospace vehicles. However, titanium-aluminum alloys also have some performance defects, which limit their application. At high temperatures over 700 °C, the oxidation resistance of titanium-aluminum alloys decreases sharply. Due to the infiltration of N and O atoms in the air at high temperature, the alloy is prone to subsurface embrittlement, which leads to a great decrease in the thermal stability, lasting strength, creep resistance, fatigue strength an...

Claims

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Application Information

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Patent Type & Authority Patents(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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