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Preparation method of MoSi2 coating layer on surface of niobium alloy

A niobium alloy and coating technology is applied in the field of surface treatment of refractory metals, which can solve the problems of large difference, coating failure and damage, and achieve the effect of good bonding, small dilution and improving bonding strength.

Active Publication Date: 2019-01-25
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The elastic modulus of niobium is 103GPa, while MoSi 2 The elastic modulus of the niobium alloy is 440GPa, and there is a large difference between the two, which can easily lead to MoSi on the surface of the niobium alloy. 2 The coating is damaged at the interface between the substrate and the coating under small deformation, resulting in coating failure

Method used

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  • Preparation method of MoSi2 coating layer on surface of niobium alloy
  • Preparation method of MoSi2 coating layer on surface of niobium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, the surface of the niobium alloy is polished, cleaned with alcohol and dried, and then a 100 μm thick Mo-W thin layer is sputtered on the surface of the niobium alloy, where the Mo element atomic percentage is 80 at.%, using high-purity argon as the sputtering Gas, the argon flow rate is 30 sccm, and the argon sputtering pressure is 0.2Pa. A planetary ball mill was used to perform long-term ball milling on the alloy powder with the mass percentage composition of Mo 60%, Nb 7.5%, Al 3.0%, W 3.0%, and the balance being Si. The ball milling time was 20h and the rotation speed was 300r / min. Thereafter, the alloy powder was adhered to the surface of the niobium alloy sputtered Mo-W thin layer with acetone, and the thickness of the alloy powder was preset to be 1.0mm, and then placed in a heating furnace at 110°C for 15 minutes to dry. A laser is used to scan the niobium alloy pre-prepared with alloy powder. The overlapping rate of the laser scanning is 40%, the laser ...

Embodiment 2

[0036] First, the surface of the niobium alloy is polished, cleaned with alcohol and dried, and then a thin layer of Mo-W with a thickness of 150 μm is sputtered on the surface of the niobium alloy. The element is Mo80at.% by atomic percentage, and the balance is W. Argon is used as the sputtering gas, the argon flow rate is 30 sccm, and the argon sputtering pressure is 0.2 Pa. A planetary ball mill was used to conduct long-time ball milling on the alloy powder whose mass percent composition was Mo58%, Nb9.0%, Al3.0%, W3.0%, and the balance was Si. The ball milling time was 22h and the speed was 300r / min. Thereafter, the alloy powder was adhered to the surface of the niobium alloy sputtered Mo-W thin layer with acetone, and the thickness of the alloy powder was preset to be 1.0mm, and then placed in a heating furnace at 110°C for 15 minutes to dry. A laser is used to scan the niobium alloy pre-prepared with alloy powder. The overlapping rate of the laser scanning is 40%, the l...

Embodiment 3

[0038] First, the surface of the niobium alloy is polished, cleaned with alcohol and dried, and then a thin layer of Mo-W with a thickness of 150 μm is sputtered on the surface of the niobium alloy. The element is Mo90at.%, the balance is W, and high-purity argon is used Argon is used as the sputtering gas, the argon flow rate is 30 sccm, and the argon sputtering pressure is 0.2 Pa. Using a planetary ball mill, the alloy powder with a mass percentage composition of Mo55%, Nb 11.0%, Al 4.5%, W 6.0%, and the balance being Si was ball milled for a long time, the ball milling time was 22h, and the rotation speed was 300r / min. Thereafter, the alloy powder was adhered to the surface of the niobium alloy sputtered Mo-W thin layer with acetone, and the thickness of the alloy powder was preset to be 1.0mm, and then placed in a heating furnace at 110°C for 15 minutes to dry. A laser is used to scan the niobium alloy pre-prepared with alloy powder. The overlapping rate of the laser scann...

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Abstract

The invention relates to the technology of refractory metal surface treatment, in particular to a preparation method of an MoSi2 coating layer on the surface of niobium alloy. The preparation method comprises the following steps of firstly, sputtering an Mo-W thin layer on the surface of the niobium alloy; preparing the MoSi2 coating layer on the Mo-W thin layer by a laser cladding technology, soas to obtain the MoSi2 coating layer with excellent mechanical property and good bonding property with the niobium alloy. The prepared MoSi2 coating layer on the surface of the niobium alloy has the advantages that a multi-element alloying method is adopted, and magnetron sputtering and laser cladding technologies are adopted for preparation; by adding multiple alloy elements, an alloying functioncan be produced on the MoSi2 coating layer, and the mechanical property of the MoSi2 coating layer can be improved; by forming the Mo-W thin layer via the magnetron sputtering, the bonding strength between the niobium alloy and the MoSi2 coating layer can be improved to a certain degree, and the stripping of the MoSi2 coating layer is reduced.

Description

technical field [0001] The invention relates to the technical field of surface treatment of refractory metals, specifically a kind of niobium alloy surface MoSi 2 Coating preparation method. Background technique [0002] Niobium alloy has a high melting point, excellent high-temperature strength and good low-temperature plasticity. It is the most promising structural material for a new generation of aerospace vehicles. It has been widely used in military industry and aerospace technology. However, the high-temperature oxidation resistance of niobium-based alloys is poor, which affects their long-term effective use under high-temperature conditions. [0003] Adding molybdenum silicide coating on the surface of niobium alloy is an important method to improve the high temperature oxidation performance of niobium alloy. MoSi 2 It is a typical high-temperature alloy thermal barrier coating material, which has excellent high-temperature oxidation resistance and can form dense a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C23C14/35C23C14/16C23C28/00
CPCC23C14/165C23C14/35C23C24/10C23C28/322C23C28/34
Inventor 孙顺平顾顺王洪金张扬李小平
Owner JIANGSU UNIV OF TECH
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