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Method for preparing anti-oxidation coating on surface of tantalum alloy material

An anti-oxidation coating, tantalum alloy technology, applied in metal material coating process, coating, solid-state diffusion coating and other directions, can solve problems such as can not meet higher requirements

Active Publication Date: 2015-05-20
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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AI Technical Summary

Problems solved by technology

[0003] Existing engine thrust chamber materials and coating systems cannot meet the higher requirements of the new generation of high specific impulse and long-life orbit attitude control engines for thrust chambers

Method used

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  • Method for preparing anti-oxidation coating on surface of tantalum alloy material
  • Method for preparing anti-oxidation coating on surface of tantalum alloy material
  • Method for preparing anti-oxidation coating on surface of tantalum alloy material

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Embodiment

[0029] A method for preparing an anti-oxidation coating on the surface of a tantalum alloy material, the steps are:

[0030] The first step: preparation of molybdenum coating on the surface of tantalum alloy

[0031] 1) Prepare the cathode molybdenum target according to the shape and size of the thrust chamber of the attitude and orbit control engine. The molybdenum target is a trapezoidal cylinder with a lower circle diameter of 45mm, an upper circle diameter of 8mm, and a height of 80mm. Use acetone to scrub and remove the molybdenum target surface The oil stain pollutants, then installed on the vacuum cathodic arc deposition equipment, as the cathode; vacuum the vacuum cathodic arc deposition equipment, the vacuum degree is 5 × 10 -2 Pa, arcing the molybdenum target under vacuum conditions to remove oxide impurities on the surface of the molybdenum target; the purity of the molybdenum target is greater than 99.9 at.%;

[0032] 2) Mechanically grind the tantalum alloy test ...

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Abstract

The invention relates to a method for preparing an anti-oxidation coating on the surface of a tantalum alloy material, belonging to the technical field of high-temperature coatings. According to the method provided by the invention, the preparation of a molybdenum coating is realized by a vacuum arc deposition method, diffusion between the molybdenum coating and a tantalum alloy matrix is realized by a vacuum heat treatment technology, and the binding force between the coating and the matrix is improved; the preparation of a molybdenum silicide gradient coating is realized by a vacuum activation pack cementation technology; meanwhile, in a silicatization process, a molybdenum silicide composite coating is formed through a silicon diffusion reaction to obtain an anti-oxidation layer, and the middle layer is a middle transition layer of tantalum silicide; and the anti-oxidation life of the coating is 50 hours at 1,800 DEG C, and the thermal shock life at 1,800 DEG C to room temperature reaches 1,300 times. Through the examination of a high-speed high-temperature airflow washout test, when the airflow speed is 1.2km / s, the anti-washout life is 7 hours at 1,600 DEG C, and the anti-washout life is 4 hours at 1,700 DEG C.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation coating on the surface of a tantalum alloy material, which belongs to the technical field of high-temperature coatings, and in particular relates to a preparation method and performance of a high-temperature anti-oxidation coating for a combustion chamber of a rail control engine. Background technique [0002] The bipropellant liquid propellant attitude-orbit control engine is an important part of modern space vehicles and strategic and tactical weapons, and is widely used in orbit control and attitude adjustment. In recent years, the development of new aircraft or weapons has continuously increased the requirements for engine performance. It is required to increase the specific impulse and increase the chamber pressure, thereby reducing the consumption of propellant and reducing the weight of the engine, as well as prolonging the life of the engine or increasing the range of strategic we...

Claims

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Application Information

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IPC IPC(8): C23C14/32C23C14/06C23C14/58C23C12/02
Inventor 李海庆陈道勇徐方涛张绪虎贾中华何开民张春基胡国林贾文军
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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