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Method for preparing high-temperature oxidation-resistant coating on niobium tungsten alloy

A high-temperature anti-oxidation and alloying technology, applied in the direction of metal material coating technology, coating, metal processing equipment, etc., can solve the problems of coating peeling, coating brittle fracture, large coating powder gap, etc., to improve the density The effect of sex, dense structure and tight organization

Active Publication Date: 2011-05-25
NINGXIA ORIENT TANTALUM IND
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  • Abstract
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Problems solved by technology

[0004] However, the applicant found that the above-mentioned method uses a micron coating powder and uses a slurry melting method. The coating used in this preparation method is 300-500 mesh, that is, the particle size is 28-48 microns. This micron powder The prepared coating structure is loose, and the coating powder gap is large. In the high-temperature atmospheric environment, due to the erosion of oxygen, the coating first breaks from the powder gap and then diffuses. This local damage leads to the early scrapping of the entire part, which greatly Reduced overall life of parts and coatings
Moreover, the niobium-tungsten alloy (Nb521) high-temperature oxidation-resistant coating coating prepared by this method has weak bonding force with the substrate, and the coating is brittle, and the coating will be brittle when bent more than 45°, and the coating in the bending zone will be damaged. Flaking occurs, making the coating unusable on high-temperature workpieces that need to be bent during installation or work

Method used

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  • Method for preparing high-temperature oxidation-resistant coating on niobium tungsten alloy

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Embodiment 1

[0028] The first step: using liquid nitrogen low-temperature ball milling technology to nano-process Mo and Si powders with a particle size of 28-48 microns to prepare nano-powders with high thermal stability, together with other powders MoSi with a particle size of 28-48 microns 2 , W, HfO 2 , Y are mixed according to the ratio in the patent application CN1948218, and then processed by liquid nitrogen low-temperature ball milling for 15-20 hours for nano-processing.

[0029] Step 2: Fix the sample of niobium-tungsten alloy (Nb521) on the frame, add the Si nano-powder made by liquid nitrogen low-temperature ball milling into the powder feeder, adjust the working air pressure at the inlet of the spray gun nozzle to 3Mpa, and the temperature to 450 ℃, the powder feeding speed is 20 g / min, the working gas is heated to 550 ℃, and the pressure is increased to 3.5Mpa. The nozzle of the spray gun is selected with a throat diameter of 2.7mm and an outlet diameter of 8.6mm. Nitrogen ...

Embodiment 2

[0034] The first step: using liquid nitrogen low-temperature ball milling technology to nano-process Mo and Si powders with a particle size of 28-48 microns to prepare nano-powders with high thermal stability, together with other powders MoSi with a particle size of 28-48 microns 2 , W, HfO 2 , Y are mixed according to the ratio in the patent application CN1948218, and then processed by liquid nitrogen low-temperature ball milling for 15-20 hours for nano-processing.

[0035] Step 2: Fix the niobium-tungsten alloy (Nb521) sample on the frame, add the Mo nano powder obtained by liquid nitrogen low-temperature ball milling into the powder feeder, adjust the working air pressure at the inlet of the spray gun nozzle to 3Mpa, and the temperature to 450 ℃, the powder feeding speed is 20 g / min, the working gas is heated to 550 ℃, and the pressure is increased to 3.5Mpa. The nozzle adopts a throat diameter of 2.7mm and an outlet diameter of 8.6mm. use N 2 For working gas, N 2 The ...

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Abstract

The invention relates to a method for preparing a high-temperature oxidation-resistant nanocomposite coating on the surface of niobium tungsten alloy (Nb521) by cold spraying and laser cladding technology, in particular to a method for preparing a high-temperature oxidation-resistant coating on niobium tungsten alloy. The method is characterized by comprising the following steps of: a, processing molybdenum (Mo) and silicon (Si) components in a high-temperature oxidation-resistant material respectively to be nanopowder for later use, mixing the rest components, and processing the mixture to be nanopowder for later use; b, cold-spraying the Si nanopowder on a niobium tungsten alloy base material; c, cold-spraying the nanopowder of the mixed rest components in the step a on the niobium tungsten alloy base material; d, cold-spraying the Mo nanopowder on the niobium tungsten alloy base material, wherein the total thickness of all the coatings is controlled to be 50 to 140 mu m; and e, irradiating, scanning and melting the coatings of the sprayed niobium tungsten alloy base material by using laser beams. By the method, the tissues among the coating powder are compact; and compactness of the coatings is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature anti-oxidation nanocomposite coating on the surface of niobium-tungsten alloy (Nb521) by cold spraying and laser cladding technology, especially a method for preparing a high-temperature anti-oxidation coating on the niobium-tungsten alloy. Background technique [0002] Our country is currently expanding its space launch vehicle industry to support satellite launch services and human spaceflight and lunar exploration programs. While expanding the space launch vehicle industry, rocket engines are constantly being upgraded. With the upgrading of rocket engines, new high-temperature high-specific-strength niobium-tungsten alloy (Nb521) materials are increasingly used in high-temperature parts of engines. The niobium-tungsten alloy (Nb521) of these high-temperature components is mostly a material with a high-temperature anti-oxidation and anti-corrosion coating on the surface. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34
Inventor 周小军赵刚王立斐王莉王秋迎
Owner NINGXIA ORIENT TANTALUM IND
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