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Method of preparing high-temperature oxidation-resistant coating on surface of refractory metal material

A high-temperature anti-oxidation, refractory metal technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of expensive preparation, loss of alloy plastic toughness and processing performance, etc., to improve the combination of coatings The effect of strength, long service life, high hardness

Active Publication Date: 2016-10-26
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alloying is mainly by adding a certain amount of Si, Cr, Al, Ti and other elements to the alloy to form a dense oxide protective film on the surface of the alloy at high temperature to prevent further diffusion and corrosion of oxygen, thereby To achieve the purpose of improving the oxidation resistance of the alloy, however, alloying is usually at the expense of the loss of alloy toughness and processing properties, and the preparation cost is expensive and has its own limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The alloy composition of Mo-35Si-10B is selected as spray welding powder, the powder size is 30 μm, and the pure molybdenum plate is used as the substrate. The workpiece after ultrasonic cleaning of anhydrous ethanol is preheated to 900 ° C by using an in-situ heating platform under the protection of argon. , adjust the non-transferred arc current to 30A, the voltage to 25V, adjust the transferred arc current to 160A, and the voltage to 170V, and start synchronous powder feeding and spray welding after the arc is stable, the spray welding speed is 20mm / min, and the powder feeding rate is 10g / min , spray welding width is 5mm, slow cooling after spray welding is completed. The thickness of the prepared coating is 1mm, and the static oxidation test in the atmospheric environment of 1200 ° C, after 150 hours of long-term oxidation, the oxidation weight loss rate of the coating is 15 mg / cm 2 .

Embodiment 2

[0039] The alloy composition of Mo-12Si-16B is selected as spray welding powder, the powder size is 60 μm, and the niobium alloy plate is used as the substrate. The workpiece after ultrasonic cleaning of anhydrous ethanol is preheated to 930 ° C by using an in-situ heating platform under the protection of argon gas. ℃, adjust the non-transferred arc current to 40A, the voltage to 30V, adjust the transferred arc current to 230A, and the voltage to 190V, and start synchronous powder feeding and spray welding after the arc is stable, the spray welding speed is 40mm / min, and the powder feeding rate is 20g / min, the width of spray welding is 15mm, and it is cooled slowly after spray welding is completed. The thickness of the prepared coating is 2.8mm, and the static oxidation test under the atmospheric environment of 1300 ° C, after 250 hours of long-term oxidation, the oxidation weight loss rate of the coating is 22 mg / cm 2 .

Embodiment 3

[0041] The alloy composition of Mo-25Si-5B is selected as spray welding powder, the powder size is 100 μm, and the tantalum alloy plate is used as the substrate. The workpiece after ultrasonic cleaning of absolute ethanol is preheated to 960°C with an in-situ heating platform under the protection of argon. ℃, adjust the non-transferred arc current to 50A, the voltage to 35V, adjust the transferred arc current to 280A, and the voltage to 220V, and start synchronous powder feeding spray welding after the arc is stable, the spray welding speed is 60mm / min, and the powder feeding rate is 40g / min, the width of spray welding is 23mm, and it is cooled slowly after spray welding is completed. The thickness of the prepared coating is 4.8mm, and the static oxidation test under the atmospheric environment of 1600 ℃, after 200 hours of long-term oxidation, the oxidation weight loss rate of the coating is 30mg / cm 2 .

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Abstract

The invention discloses a method of preparing a high-temperature oxidation-resistant coating on the surface of a refractory metal material. The method is characterized in that by adopting a plasma arc spray welding technology, a Mo-Si-B alloy high-temperature oxidation-resistant coating is prepared on the surface of refractory metal. With the adoption of Mo-Si-B alloy powder containing required components, and by controlling a dilution rate, coating components can be controlled, and a foundation is established for the flexible design of the coating components; compared with the traditional pack cementation method, thermal spraying method and magnetron sputtering method, with the adoption of the plasma arc spray welding technology, the coating bonding strength, the coating thickness and the coating compactness are improved obviously, and a guarantee is provided for the Mo-Si-B alloy high-temperature oxidation-resistant coating which is long in service life. According to the Mo-Si-B alloy high-temperature oxidation-resistant coating, the oxidation resistance at high temperature of refractory metal like molybdenum, niobium, tantalum and alloys of molybdenum, niobium and tantalum is improved effectively, and the service lives of refractory metal spare parts are prolonged obviously.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and relates to a method for preparing a high-temperature anti-oxidation coating on the surface of a refractory metal material. Background technique [0002] Refractory metals molybdenum, niobium, tantalum and their alloys are widely used in high-temperature parts in the fields of aviation, aerospace, energy and transportation due to their high melting point, good high-temperature mechanical properties, creep strength, and wear resistance. superior. As a structural material used in a high-temperature environment, not only is the material required to have high high-temperature strength and fracture toughness, but it can also meet the requirements for oxidation resistance in a high-temperature environment. However, refractory metals molybdenum, niobium, tantalum and their alloys begin to undergo serious oxidation above 600°C in an oxidizing atmosphere, and as the temperature increases, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/131C23C4/134C22C27/04
CPCC22C27/04C23C4/06
Inventor 张国君邓新科任帅王涛
Owner XIAN UNIV OF TECH
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