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High-entropy alloy/Ti3SiC2 multilayer composite coating and preparation method thereof

A high-entropy alloy, multi-layer composite technology, applied in metal material coating process, coating, vacuum evaporation coating and other directions, can solve the problems of anisotropy, low bonding strength, and high brittleness of the coating

Active Publication Date: 2022-07-29
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, the Ti3SiC2MAX phase is generally hexagonal, and slipping between layers is prone to occur. dislocation, and then a certain plastic deformation
In the process of quasi-plastic deformation, its layered structure will produce streamlines similar to metal plastic deformation, which is the stacking and movement of dislocations, making its hardness low, about 4GPa; and Ti3SiC2 material is brittle as a coating, and the bonding part with the substrate is brittle and brittle, and the bonding strength with the substrate is not high; because Ti3SiC2 MAX phase layered structure, defect migration along the layer is much easier than through the layer, which makes Ti3SiC2MAX phase material at high temperature The properties are anisotropic, which limits its application in high temperature field

Method used

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  • High-entropy alloy/Ti3SiC2 multilayer composite coating and preparation method thereof
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  • High-entropy alloy/Ti3SiC2 multilayer composite coating and preparation method thereof

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preparation example Construction

[0055] The present invention provides the above-mentioned high-entropy alloy / Ti 3 SiC 2 The preparation method of the multi-layer composite coating comprises the following steps:

[0056] (1) Deposit the bottom layer and the transition layer on the surface of the substrate in turn;

[0057] (2) Alternately and cyclically deposit TiVNbMoTaW layers and Ti layers on the surface of the transition layer 3 SiC 2 layer to obtain a multi-layer composite coating pre-product;

[0058] The deposition method of the TiVNbMoTaW layer is magnetron sputtering deposition, the Ti 3 SiC 2 The deposition method of the layer is arc ion plating deposition;

[0059] (3) heat-treating the multi-layer composite coating preform to obtain a high-entropy alloy / Ti 3 SiC 2 Multilayer composite coating.

[0060] In the present invention, the bottom layer and the transition layer are sequentially deposited on the surface of the substrate. In the present invention, the substrate is preferably one or...

Embodiment 1

[0125] (1) Preparation of TiVNbMoTaW high-entropy alloy target

[0126] Step 1: The substrate selects a titanium alloy with a thickness of 6 mm as the substrate, and the surface is sandblasted, degreasing, and then ultrasonically cleaned with acetone and anhydrous ethanol, and dried for later use.

[0127]Step 2: The TiVNbMoTaW high-entropy alloy powder (as-cast atomized spherical powder) with a purity of 90% is sieved with a 200-mesh sieve, and dried in a vacuum drying oven at 150° C. for 45 minutes to obtain spray powder;

[0128] Step 3: Turn on the PCS-1000 cold spray equipment, fix the substrate on the spray jig, and use N 2 (99.9%) gas is used as the working air pressure for spraying, and the spraying process parameters are as follows:

[0129] The deposition temperature is 550℃;

[0130] The spraying pressure is 5Pa;

[0131] The nitrogen flow is 6L / min;

[0132] Nozzle size is 2.5×0.25mm 2 ;

[0133] The spraying speed is 1000mm / min;

[0134] The spraying dista...

Embodiment 2

[0143] Using TC4 titanium alloy as matrix, using Ti target, Ti 3 SiC 2 The alloy target was used as the ion arc target, and the TiVNbMoTaW high-entropy alloy target was used as the magnetron sputtering target. The polished substrates were ultrasonically cleaned in acetone and alcohol at 50 °C for 15 min, respectively, and then sucked up with filter paper. After drying, they were hung on the selected sample holder in the coating chamber with a target-to-base distance of 10 mm. Start the power supply, turn on the vacuum pump, the Roots pump, and vacuum the cavity to 5.0×10 -3 After Pa, the temperature in the deposition chamber was heated to 400°C, then argon gas of 300sccm was introduced, the substrate bias was set to -1000V, and the surface of the substrate was cleaned with Ar ions, and the bombardment time was 15min.

[0144] Coating steps:

[0145] (1) First, a layer of Ti metal layer was deposited on the substrate by arc ion plating (AIP) technology. The substrate bias wa...

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Abstract

The invention provides a high-entropy alloy / Ti3SiC2 multilayer composite coating and a preparation method thereof, and belongs to the technical field of composite coatings. According to the invention, the mode that the high-entropy alloy layers and the Ti3SiC2 layers are alternately arranged is adopted, and TiVNbMoTaW can inhibit abnormal growth of Ti3SiC2 grains, so that the anisotropy of a Ti3SiC2MAX phase at a high temperature is relieved, and the high electric conduction and heat conduction performance of Ti3SiC2 at the high temperature is ensured. The TiVNbMoTaW layers and the Ti3SiC2 layers are alternately arranged, so that the brittleness of the Ti3SiC2 material can be improved, and the bonding strength of the composite coating and a matrix is improved. Besides, the TiVNbMoTaW refractory high-entropy alloy layer with a high melting point and high solution strengthening has good high-temperature thermal stability and high-temperature strength, and meanwhile, the TiVNbMoTaW refractory high-entropy alloy layer further contains superconductive Ti, Nb and Ta elements, so that the composite coating has excellent high-temperature strength and also has good conductivity.

Description

technical field [0001] The invention relates to the technical field of composite coatings, in particular to a high-entropy alloy / Ti 3 SiC 2 Multilayer composite coating and preparation method thereof. Background technique [0002] The MAX phase material is a layered compound of ternary carbides and oxides with a total molecular formula of (M n+1 AX n ), where n is 1, 2, 3, M is a transition metal, A is a group A element (mainly IIIA or IVA), and X is a C or N element. Ti 3 SiC 2 It is a layered hexagonal structure compound, the crystal is a plane layer spaced stacking structure, composed of Ti 3 SiC 2 It is composed of layers and Si atoms and is a typical representative of the layered ternary material family because of its unique structure and excellent properties, such as high electrical and thermal conductivity, low density, mechanical processability, excellent thermal shock resistance, High melting point, high thermal stability, high temperature oxidation resistan...

Claims

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Application Information

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IPC IPC(8): C23C14/32C23C14/35C23C14/16C23C14/06C23C14/58
CPCC23C14/325C23C14/35C23C14/3414C23C14/3485C23C14/345C23C14/16C23C14/165C23C14/0635C23C14/5806
Inventor 魏仕勇胡强谌昀万珍珍金莹谢仕芳
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI