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A niobium alloy surface mosi 2 Coating Preparation Method

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

Active Publication Date: 2020-07-28
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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  • A niobium alloy surface mosi <sub>2</sub> Coating Preparation Method
  • A niobium alloy surface mosi <sub>2</sub> Coating Preparation Method

Examples

Experimental program
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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 150 μm thick Mo-W thin layer is sputtered on the surface of the niobium alloy. Argon is used as the sputtering gas, the flow rate of argon gas is 30 sccm, and the pressure of argon gas sputtering 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 sputtered Mo-W thin layer of niobium alloy 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 power is 2.3kW, and the scanning speed is 9mm / s. The bonding s...

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 Mo 90at.%, and the balance is W. Argon is used as the sputtering gas, the flow rate of argon gas is 30 sccm, and the pressure of argon gas sputtering 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 sputtered Mo-W thin layer of niobium alloy 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 4...

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Abstract

The invention relates to the surface treatment technology of refractory metals, specifically a kind of niobium alloy surface MoSi 2 Coating preparation method. First sputter a layer of Mo-W thin layer on the surface of niobium alloy, and then prepare MoSi on the Mo-W thin layer by laser cladding process 2 coating, MoSi with excellent mechanical properties and good combination with niobium alloy can be obtained 2 coating. Niobium alloy surface MoSi prepared by the present invention 2 The coating adopts multi-element alloying method and is prepared by magnetron sputtering and laser cladding process. On the one hand, due to the addition of multiple alloying elements, the MoSi 2 The coating creates an alloying effect that can improve the MoSi 2 The mechanical properties of the coating; on the other hand, niobium alloys and MoSi can also be improved to some extent by magnetron sputtering Mo‑W thin layers 2 The bonding strength between coatings can reduce the MoSi 2 Peeling of the coating.

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 Patents(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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