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Mo-Si-B/TiN composite coating and preparation method thereof

A composite coating, mo-si-b technology, applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems of poor oxidation resistance, brittleness and easy formation of cracks

Inactive Publication Date: 2021-06-29
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing studies have shown that serious interdiffusion between Mo-Si-B coatings and Nb-Si-based alloys is prone to occur, and Si in Mo-Si-B coatings diffuses into the substrate, making Mo-Si-B coatings The Si content is reduced, when the Si content is reduced to a certain extent, MoSi 2 phase will degenerate into a brittle phase with poor oxidation resistance (Mo 5 Si 3 phase), the dense oxide film can no longer be formed, and the brittle phase is easy to form cracks, which all accelerate the failure of the Mo-Si-B coating

Method used

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  • Mo-Si-B/TiN composite coating and preparation method thereof
  • Mo-Si-B/TiN composite coating and preparation method thereof
  • Mo-Si-B/TiN composite coating and preparation method thereof

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preparation example Construction

[0036] Based on the same inventive concept, the present invention also provides a method for preparing a Mo-Si-B / TiN composite coating, comprising the following steps:

[0037] S1: Using Nb-Si-Ti-Cr-Al-Hf six-component alloy as the first synthetic raw material, the first synthetic raw material was sequentially subjected to non-consumable vacuum arc melting and induction melting to obtain Nb-Si-based alloy ingots at 1250 °C Under the condition of annealing for a preset time t, cut a disc sample with a diameter of 8mm to 12mm and a thickness of 2mm to 3mm as the substrate; where, 0h<t≤60h;

[0038] S2: Select the alloying element whose nominal chemical composition is Mo-nSi-mB as the second synthetic raw material, conduct non-consumable vacuum arc melting on the second synthetic raw material to obtain Mo-Si-B alloy ingot, and Mo-Si-B alloy ingot Perform mechanical crushing to obtain Mo-Si-B alloy powder, and use a planetary ball mill to perform ball milling on the Mo-Si-B alloy ...

Embodiment 1

[0045] The first step is the preparation of the matrix.

[0046] Select the alloy element whose nominal chemical composition is Nb-16Si-22Ti-17Cr-2Al-2Hf (atomic percentage, at%) as the first synthetic raw material, and use non-consumable vacuum arc melting and induction melting to obtain Nb-Si based alloy ingots , and then annealed at 1250 ° C for 50 h, and cut into disc samples with a diameter of 12 mm and a thickness of 2 mm as the substrate.

[0047] The second step: preparation of Mo-Si-B mixed layer material.

[0048] Select the alloy element whose nominal chemical composition is Mo-62Si-5B (atomic percentage, at%) as the second synthetic raw material, and use non-consumable vacuum arc melting to obtain Mo-Si-B alloy ingot. For Mo-Si-B alloy ingot Perform mechanical crushing to obtain Mo-Si-B alloy powder, and then use a planetary ball mill to perform ball milling on the Mo-Si-B alloy powder to obtain Mo-Si-B alloy powder with a particle size of 2-4 μm.

[0049] The th...

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Abstract

The invention discloses a Mo-Si-B / TiN composite coating and a preparation method thereof. The Mo-Si-B / TiN composite coating is composed of a TiN diffusion resistance layer and a Mo-Si-B mixed layer, and the TiN diffusion resistance layer can completely prevent mutual diffusion of elements in the coating and a matrix in the preparation process; and after oxidizing is carried out for 100 hours at the high temperature of 1200-1300 DEG C, the oxidation weight is increased by 0.52 mg / cm<3>-0.78 mg / cm<3>, a crystalline SiO2 and amorphous borosilicate mixed layer is formed on the surface of the Mo-Si-B mixed layer, the Mo-Si-B mixed layer can be prevented from being further oxidized, and the TiN diffusion resisting layer can effectively inhibit mutual diffusion between the Mo-Si-B mixed layer and the matrix in the oxidation process, so that it is guaranteed that the Mo-Si-B / TiN composite coating has enough antioxidant elements, and the anti-oxidation service life of the Mo-Si-B / TiN composite coating can be prolonged.

Description

technical field [0001] The invention relates to the technical field of super high temperature alloy coating materials, in particular to a Mo-Si-B / TiN composite coating and a preparation method thereof. Background technique [0002] Nb-Si-based alloys have the advantages of high melting point, low density, and high strength at high temperatures, which make it a potential structural material for a new generation of aircraft engines. However, the poor oxidation resistance of Nb-Si based alloys hinders its application. The oxidation resistance of the alloy can be improved to a certain extent by adding anti-oxidation elements such as Cr, Al, Ti and Hf, but the mechanical properties such as fracture toughness and creep properties of the alloy will be sacrificed. A protective coating with excellent oxidation resistance is an effective method to improve the oxidation resistance of Nb-Si based alloys. [0003] Mo-Si-B alloy has excellent oxidation resistance and is expected to be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/35C23C14/02B22F7/04B22F9/04B22F3/105
CPCB22F3/105B22F7/04B22F9/04B22F2007/042B22F2009/043C23C14/028C23C14/0641C23C14/35
Inventor 周春根侯庆艳
Owner BEIHANG UNIV
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