Niobium alloy surface high-temperature-resistant high-oxygen-barrier heat-insulating coating and preparation method thereof

A heat-insulating coating and high-temperature-resistant technology, applied in metal material coating process, coating, superimposed layer plating, etc. The effect of reducing surface temperature, improving bonding strength and avoiding oxidation failure

Active Publication Date: 2022-01-25
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, in aerospace applications, the working environment temperature of niobium-based alloys usually exceeds 1000 °C, and metal niobium will be oxidized when the temperature exceeds 700 °C in an aerobic environment, forming niobium pentoxide (Nb 2 o 5 ), but there is a difference in thermophysical properties between niobium metal and niobium pentoxide, which will cause niobium oxide to peel off quickly from the surface of niobium metal, thus making the niobium-based alloy invalid and unusable, reducing its service life

Method used

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  • Niobium alloy surface high-temperature-resistant high-oxygen-barrier heat-insulating coating and preparation method thereof
  • Niobium alloy surface high-temperature-resistant high-oxygen-barrier heat-insulating coating and preparation method thereof
  • Niobium alloy surface high-temperature-resistant high-oxygen-barrier heat-insulating coating and preparation method thereof

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preparation example Construction

[0042] In order to further expand the application range of niobium-based alloy materials, increase its limit working temperature, and solve the problems of metal niobium oxidation failure in high-temperature aerobic environment, combined with figure 1 As shown, the present invention provides a method for preparing a high-temperature-resistant, high-resistance, oxygen-resistant heat-insulating coating on the surface of a niobium alloy. In sequence, an adhesive layer, an anti-oxidation layer, an oxygen-resistant propagation layer, and an insulating layer are prepared on the surface of a niobium-based alloy. The thermal cooling layer comprises the steps of:

[0043] (1) Using metal tantalum to form a bonding layer on the surface of the niobium-based alloy;

[0044] (2) The bonding layer is placed in the air, and the metal tantalum is oxidized, so that a tantalum oxide anti-oxidation layer is formed on the surface of the bonding layer;

[0045] (3) Prepare and form an oxygen barr...

Embodiment 1

[0065] In this example, the GH3044 niobium alloy material is used as the substrate, and a coating composed of "adhesive layer + oxidation resistance layer + oxygen barrier transmission layer + heat insulation and cooling layer" is prepared on the surface of the niobium alloy substrate. The steps are as follows:

[0066] (1) Prepare a metal tantalum coating with a thickness of 80 microns on the surface of the niobium-based alloy by cold spraying, and the particle size of the metal tantalum spherical powder used is 30 to 70 microns; during the cold spraying process, compressed nitrogen is used as the working gas. The spraying pressure is 0.76MPa, the spraying distance is 30mm, the spraying temperature is 1000°C, the powder feeding rate is 40g / min, the coating deposition rate is 20 microns per minute, and the spraying time is 4 minutes.

[0067] (2) After the sprayed metal tantalum bonding layer is placed in the air for more than one hour, the metal tantalum is oxidized, and a den...

Embodiment 2

[0075] In this example, the GH3044 niobium alloy material is used as the substrate, and a coating consisting of "adhesive layer + oxidation resistance layer + oxygen barrier transmission layer + heat insulation and cooling layer" is prepared on the surface of the niobium alloy substrate. The steps are as follows:

[0076] (1) Prepare a metal tantalum coating with a thickness of 60 microns on the surface of the niobium-based alloy by cold spraying, and the particle size of the metal tantalum spherical powder used is 30 to 70 microns; during the cold spraying process, compressed nitrogen is used as the working gas. The spraying pressure is 0.76MPa, the spraying distance is 30mm, the spraying temperature is 1000°C, the powder feeding rate is 40g / min, the coating deposition rate is 20 microns per minute, and the spraying time is 3 minutes.

[0077] (2) After the sprayed metal tantalum bonding layer is placed in the air for more than one hour, the metal tantalum is oxidized, and a d...

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Abstract

The invention discloses a niobium alloy surface high-temperature-resistant high-oxygen-barrier heat-insulating coating and a preparation method thereof. The coating comprises a bonding layer, an anti-oxidation layer, an oxygen propagation resistance layer and a heat-insulating cooling layer. The preparation method comprises the following steps that the bonding layer is prepared on the niobium-based alloy surface through metal tantalum; the bonding layer is placed in air, the metal tantalum is oxidized, and the tantalum oxide anti-oxidation layer is formed on the surface of the bonding layer; the oxygen propagation resistance layer is prepared on the surface of the anti-oxidation layer by using a ceramic material; and the heat-insulating cooling layer is prepared on the surface of the oxygen propagation resistance layer by using a ceramic material. The coating material prepared by the invention has the properties of heat insulation, cooling, high temperature resistance, oxidation resistance, oxygen propagation resistance, corrosion resistance and the like, can enable the niobium-based alloy to serve for a long time at the temperature close to the melting point of the niobium-based alloy, and breaks through the working limit temperature of a traditional niobium alloy material.

Description

technical field [0001] The invention relates to the technical field of alloy surface protective coatings and preparation thereof, in particular to a high-temperature-resistant, high-resistance oxygen heat-insulating coating on the surface of niobium alloys and a preparation method thereof. Background technique [0002] Metal niobium is a refractory metal with a melting point of over 2400°C and has extremely high strength in a very high temperature range (1000-1470°C). At the same time, metal niobium has excellent plasticity, good processing and welding performance, so it can be manufactured into thin plates And parts with complex shapes are often used as thermal protection and structural materials in the aerospace field. In addition, adding different types of metal elements to metal niobium, and through composition regulation and structure control can further improve the various properties of niobium-based alloys, thereby further expanding its application range. However, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/58C23C4/08C23C4/18C23C4/11C23C28/00C23C14/30C23C24/04C23C4/134C23C4/137
CPCC23C14/16C23C14/5853C23C4/08C23C4/18C23C4/11C23C28/322C23C28/3455C23C14/30C23C24/04C23C4/134C23C4/137
Inventor 冯晶陈琳张陆洋王建坤苏涛
Owner KUNMING UNIV OF SCI & TECH
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