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Method for preparing MoSi2 (molybdenum disilicide) coating layer by surface laser cladding of molybdenum alloy

A laser cladding, molybdenum alloy technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the problem of easy occurrence of stress and cracks, weak coating adhesion, and high brittleness of the coating. problem, to achieve the effect of improving high temperature oxidation resistance, improving oxidation resistance and improving mechanical properties

Active Publication Date: 2019-01-18
JIANGSU UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, MoSi 2 The coating is brittle and prone to stress and cracks during use
Since molybdenum alloy and MoSi 2 The coefficient of thermal expansion is different, so the bonding force of the coating is not strong, and the phenomenon of coating peeling often occurs in engineering use.

Method used

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  • Method for preparing MoSi2 (molybdenum disilicide) coating layer by surface laser cladding of molybdenum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, the surface of the molybdenum alloy is polished, ultrasonically cleaned with alcohol, dried, and then a thin layer of Si with a thickness of 25 μm is sputtered on the molybdenum alloy by magnetron sputtering, using high-purity argon as the sputtering gas, and the flow rate of the argon gas is 25sccm, the argon sputtering pressure is 0.25Pa. The mass percent is Mo 60%, Nb 3.5%, W 3.0%, Cr 2.5%, Ti 2.0%, Al 2.0%, and the balance is Si for a long time ball milling, the ball milling time is 18h, and the rotating speed is 300r / min. After that, acetone was used to adhere the alloy powder to the surface of the molybdenum alloy sputtered with Si thin layer. The thickness of the alloy powder was preset to be 0.5mm, and then placed in a heating furnace at 140°C for 30 minutes to dry. A laser is used to scan the molybdenum alloy sputtered Si thin layer. The overlapping rate of the laser scanning is 40%, the laser power is 2.0kW, and the scanning speed is 8mm / s to make the...

Embodiment 2

[0031] First, the surface of the molybdenum alloy is polished, ultrasonically cleaned with alcohol, dried, and then a thin layer of Si with a thickness of 20 μm is sputtered on the molybdenum alloy by magnetron sputtering, using high-purity argon as the sputtering gas, and the flow rate of the argon gas is 25sccm, the argon sputtering pressure is 0.25Pa. The mass percentage is Mo 55%, Nb 5.5%, W 4.5%, Cr 3.5%, Ti 2.5%, Al 3.0%, and the balance is Si for a long time ball milling, the ball milling time is 21h, and the rotating speed is 350r / min. After that, acetone was used to adhere the alloy powder to the surface of the molybdenum alloy sputtered with Si thin layer. The thickness of the alloy powder was preset to be 0.8mm, and then placed in a heating furnace at 150°C for 30 minutes to dry. A laser is used to scan the molybdenum alloy sputtered Si thin layer. The overlapping rate of the laser scanning is 40%, the laser power is 2.2kW, and the scanning speed is 6mm / s, and the...

Embodiment 3

[0033] First, the surface of the molybdenum alloy is polished, ultrasonically cleaned with alcohol, dried, and then a thin layer of Si with a thickness of 30 μm is sputtered on the molybdenum alloy by magnetron sputtering, using high-purity argon as the sputtering gas, and the flow rate of the argon gas is 25sccm, the argon sputtering pressure is 0.25Pa. The mass percentage is Mo 50%, Nb 7.5%, W 6.0%, Cr 4.5%, Ti 3.5%, Al 5.5%, and the balance is Si for a long time ball milling, the ball milling time is 24h, and the speed is 400r / min. After that, acetone was used to adhere the alloy powder to the surface of the molybdenum alloy sputtered with Si thin layer. The thickness of the alloy powder was preset to be 1.0 mm, and then it was placed in a heating furnace at 160°C for 40 minutes to dry. A laser is used to scan the molybdenum alloy sputtered Si thin layer. The overlapping rate of the laser scanning is 40%, the laser power is 2.4kW, and the scanning speed is 8mm / s, and the ...

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Abstract

The invention belongs to the technical field of surface laser cladding of refractory metal, in particular to a method for preparing a MoSi2 (molybdenum disilicide) coating layer by surface laser cladding of molybdenum alloy. The method comprises the following steps of firstly, sputtering an Si (silicon) thin layer with thickness of 20 to 30mum at the surface of molybdenum alloy; then, presetting acarbon nitride alloy powder; combining the molybdenum alloy, the sputtered Si thin layer and the preset carbon nitride alloy powder together by laser scanning, so as to obtain the MoSi2 coating layerwith excellent mechanical property and good combining property with molybdenum alloy. The prepared MoSi2 coating layer at the surface of the molybdenum alloy has the advantages that by adopting the magnetron sputtering Si thin layer, and utilizing the laser cladding technology, the Mo-Si element transition layer can be formed, and the bonding strength between the molybdenum alloy and the MoSi2 coating layer is improved; the carbide coating layer is prepared at the surface of the molybdenum alloy sputtered with the Si thin layer, the tissues of the coating layer are uniform and dense, and thecombining is good; under the multi-element alloying function, the service property of the coating layer can be improved.

Description

technical field [0001] The invention relates to the technical field of laser cladding on the surface of refractory metals, in particular to the preparation of MoSi by laser cladding on the surface of a molybdenum alloy 2 Coating method. Background technique [0002] Molybdenum-based alloys have a high melting point, small thermal expansion coefficient, high strength, high elastic modulus, good electrical and thermal conductivity, strong corrosion resistance, and high-temperature mechanical properties. They have been widely used in military industry, aerospace technology, and energy equipment. application. However, the high-temperature oxidation resistance of molybdenum-based alloys is not good, which affects the long-term effective use under high-temperature conditions. [0003] At present, the method to improve the high temperature oxidation performance of molybdenum alloy is to add molybdenum silicide coating. MoSi 2 It is a typical high-temperature alloy thermal barri...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C14/35C23C14/16C23C28/04
CPCC23C14/165C23C14/35C23C24/10C23C28/042
Inventor 孙顺平顾顺胡益丰王洪金张扬
Owner JIANGSU UNIV OF TECH
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