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NiCoCrAlY / ZrO2 composite coating on gamma-TiAl alloy surface and preparation method thereof

A composite coating and alloy technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the problems of high temperature oxidation resistance, poor tribological performance and bonding force

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

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high temperature oxidation resistance, tribological properties and poor bonding force in the prior art, the present invention provides a NiCoCrAlY / ZrO on the surface of γ-TiAl alloy 2 Composite coating and preparation method improve high temperature oxidation resistance and wear resistance of γ-TiAl alloy surface

Method used

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  • NiCoCrAlY / ZrO2 composite coating on gamma-TiAl alloy surface and preparation method thereof
  • NiCoCrAlY / ZrO2 composite coating on gamma-TiAl alloy surface and preparation method thereof
  • NiCoCrAlY / ZrO2 composite coating on gamma-TiAl alloy surface and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] (1) After cutting the γ-TiAl alloy into a sample of 15×15×5 mm, the surface of the sample was first polished with sandpaper, and then Cr 2 o 3 The polishing powder is polished to a mirror surface, and finally placed in alcohol for ultrasonic cleaning;

[0038] (2) Place NiCoCrAlY (composition Ni-(20~23)Co-(20~24)Cr-(11~13)Al-(0.25~0.45)Y) at the source of the double-layer glow plasma metallization furnace and pure Zr (purity 99.99%) targets, the size is Before loading into the furnace, the target material needs to be polished with sandpaper to expose the fresh surface, ultrasonically cleaned with anhydrous ethanol, and dried;

[0039](3) The γ-TiAl alloy sample is placed on the stage, parallel to the target, the distance between the NiCoCrAlY alloy target and the γ-TiAl alloy sample is controlled at 15-20mm, and then the bell jar is lowered;

[0040] (4) Turn on the mechanical pump to evacuate to below 5pa, pass in argon, adjust the air pressure in the furnace to 35...

Embodiment 2

[0061] Except that the parameters of Zr-O co-infiltration are changed to working pressure of 45Pa, source voltage of 950V, cathode voltage of 450V, pole spacing of 15mm, argon and oxygen flow ratio of 10:1, and heat preservation for 2 hours, other steps are the same as in Example 1 .

[0062] In the room temperature friction and wear test of this embodiment, the friction coefficient of the coating is 0.28, and the wear amount is 0.57mg, which is 77.01% lower than that of the substrate. The high temperature oxidation tests at 750°C, 850°C, and 950°C show that the coating After 100h, it is well bonded to the substrate, the surface does not peel off, and the oxidation weight gain is 25mg / cm 2 , is further reduced than in Example 1, and the oxidation resistance is good.

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Abstract

The invention belongs to the field of titanium alloy surface treatment. The NiCoCrAlY / ZrO2 composite coating comprises a ZrO2 alloying layer, a NiCoCrAlY layer and a NiCoCrAlY diffusion layer from a surface layer to an inner layer. The invention adopts the double glow plasma surface alloying technology to form the NiCoCrAlY alloying layer on the surface of gamma-TiAl alloy surface; then oxygen is introduced for ZrO2 co-alloying to form a ZrO2 alloying layer on the surface of NiCoCrAlY coating; finally a high temperature oxidation-resistant NiCoCrAlY / NiCoCrAlY composite layer is formed on the surface of gamma-TiAl titanium alloy. The ZrO2 alloying layer endows the gamma-TiAl titanium alloy with sufficient high temperature protection ability, the sub-surface NiCoCrAlY alloying layer can overcome the serious decomposition of ZrO2 coating under high temperature; and the NiCoCrAlY / ZrO2 multilayer structure realizes sufficient and reliable bonding strength between the alloy layer and a matrix, so as to improve the high temperature oxidation resistance and wear resistance of the gamma-TiAl alloy.

Description

technical field [0001] The invention belongs to the field of titanium alloy surface treatment, in particular to NiCoCrAlY / ZrO on the surface of a γ-TiAl alloy 2 Composite coating and preparation method. Background technique [0002] In order to increase the thrust-to-weight ratio of aerospace vehicle engines and save fuel, it is an important method to increase the working temperature of materials and reduce their structural weight. The Ti-Al intermetallic compound has high specific strength, and its high-temperature strength and rigidity are higher than those of Ni-based and Ti-based alloys. It is internationally recognized as the most potential high-temperature structure in materials for aviation, aerospace vehicle engines, industrial gas turbines, and automotive engines. One of the materials, it has attracted the attention of scientists and relevant departments at home and abroad. In Ti-Al intermetallic compounds, Ti 3 Al, TiAl and TiAl 3 most widely studied. Among th...

Claims

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Application Information

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IPC IPC(8): C23C14/34C23C14/08C23C14/16C23C28/00
CPCC23C14/0036C23C14/083C23C14/16C23C14/3464C23C28/34
Inventor 缪强陆海峰梁文萍王昉丁铮胡荣耀陈博文李柏强黄彪子
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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