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Method and application of improving oxidation resistance of niobium-based alloy and anti-oxidation niobium-based alloy

A technology of anti-oxidation performance and niobium-based alloys, which is applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve the problems of "pest" oxidation and poor oxidation resistance, and achieve good bonding and thickness Uniform and enhance the effect of service performance

Active Publication Date: 2022-07-01
BEIJING CISRI GAONA TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The first object of the present invention is to provide a method for improving the oxidation resistance of niobium-based alloys, so as to solve the technical problems of poor oxidation resistance of niobium-based alloys and occurrence of "pest" oxidation phenomenon in the prior art

Method used

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  • Method and application of improving oxidation resistance of niobium-based alloy and anti-oxidation niobium-based alloy
  • Method and application of improving oxidation resistance of niobium-based alloy and anti-oxidation niobium-based alloy
  • Method and application of improving oxidation resistance of niobium-based alloy and anti-oxidation niobium-based alloy

Examples

Experimental program
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Embodiment 1

[0068] The present embodiment provides a method for improving the oxidation resistance of a niobium-based alloy, comprising the following steps:

[0069] (1) Using machining to cut Nb521 alloy, the sample is cut into circular samples with a diameter of Φ20mm and a height of 3.5mm, and then each circular sample is equally divided into 4 fan-shaped samples;

[0070] (2) Use 120#, 320#, 800#, 1500# water-grinding paper to polish both sides of the sample, ultrasonically clean for 10 minutes, and then blow dry to obtain a pretreated niobium-based alloy Nb521 matrix for use;

[0071] (3) Use the machining method to open a rectangular groove at the bottom of the alumina ceramic boat of 72 × 40 × 15 mm, the groove length is 10 mm, and the groove width is 5 mm, and the ceramic boat after the groove is ultrasonically decontaminated;

[0072] (4) The niobium-based alloy Nb521 matrix obtained in step (2) is stuck in the porcelain boat groove obtained in step (3), and then placed in the ni...

experiment example 1

[0086] The surface of the sample before and after nitriding of the niobium-based alloy Nb521 matrix of Example 1 was analyzed by XRD equipment. The XRD pattern is as follows: figure 1 shown. from figure 1 It can be seen from the above that the matrix of the niobium-based alloy Nb521 is a single-phase material, and only the Nbss solid solution phase exists. The nitrided layer formed on the surface of the niobium-based alloy Nb521 after nitriding is mainly Nb 2 N and Nb 4 N 3 Mutually.

[0087] figure 2 The scanning electron microscope image of the cross section of the nitrided layer formed after nitriding the niobium-based alloy Nb521 matrix provided in Example 1 of the present invention. It can be seen from the figure that the thickness of the nitrided layer is uniform and dense, and the bonding with the substrate is good.

[0088] image 3 The macroscopic topography of the surface of the niobium-based alloy Nb521 matrix and the nitrided niobium-based alloy Nb521 provi...

experiment example 2

[0092] In order to compare and illustrate the effects of different nitriding process parameters on the properties of the niobium-based alloy after nitriding, the effects of the niobium-based alloy Nb521 after nitriding treatment in Example 1 of the present invention and Comparative Examples 1-4 were tested and compared. The cross-sectional scanning electron microscope backscattering pictures of the 5 groups of niobium-based alloy Nb521 samples after nitriding treatment and the surface distribution maps of Nb and N elements are shown in the following figures, respectively. Figure 6 to Figure 8 shown.

[0093] As can be seen from the figure, the thicknesses of the nitrided layers of Example 1 and Comparative Examples 1 to 4 are 12 to 13 μm, about 10 μm, about 10 μm, about 10 μm, and 6 to 7 μm, respectively.

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Abstract

The invention relates to the technical field of oxidation protection of high-temperature structural materials, in particular to a method, application and anti-oxidation niobium-based alloy for improving the oxidation resistance of niobium-based alloys. The method for improving the oxidation resistance of niobium-based alloys includes the following steps: forming a nitriding layer on the surface of a niobium-based alloy substrate by gas nitriding; It is 8-16h; the nitriding gas includes a volume ratio of 1:(0.45-0.55):(0.08-0.12) nitrogen, argon and hydrogen. Aiming at the niobium-based alloy, the invention uses a specific gas nitriding method to obtain a nitriding layer with continuous compactness, uniform thickness and stable composition on the niobium-based alloy, thereby improving the oxidation resistance of the niobium-based alloy and further improving its service performance.

Description

technical field [0001] The invention relates to the technical field of oxidation protection of high-temperature structural materials, in particular to a method, application and anti-oxidation niobium-based alloy for improving the oxidation resistance of niobium-based alloys. Background technique [0002] Niobium (Nb)-based alloys are one of the important candidates for high-temperature structural materials for hot-end components in the aerospace field. The service temperature of niobium-based alloy is higher than that of traditional nickel-based superalloy and cobalt-based superalloy, and it still has good mechanical properties at its extreme working temperature, and can still maintain high strength at 1100 ~ 1650 ℃. Has good weldability and good machinability. Therefore, niobium-based alloys are expected to be the hot-end component materials for next-generation engines or hypersonic vehicles. [0003] However, due to the poor oxidation resistance of niobium-based alloys, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/24C22C27/02
CPCC23C8/24C22C27/02
Inventor 甘斌毕中南于鸿垚李云沙江波
Owner BEIJING CISRI GAONA TECH
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