Preparation method of niobium alloy surface high-temperature oxidation resistant coating

A technology of high temperature oxidation resistance and niobium alloy, applied in the direction of metal material coating process, coating, etc., can solve the problem of reducing the high temperature air erosion resistance of silicide coating, the application limitation of single silicide coating, and the inability to meet more and more requirements. Strict service requirements and other issues

Pending Publication Date: 2022-06-28
ZHONGBEI UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0009] With the rapid development of aerospace technology, high-temperature structural devices have higher and higher requirements for high-temperature protective coatings of refractory metals, such as ultra-high temperature resistance (≥1800°C), gas erosion resistance, and long service life. Therefore, the current traditional single The system silicide coating can no longer meet the increasingly stringent service requirements
[0010] Such as Liu Lin (MoSi 2 Research on the preparation and performance of high-temperature oxidation-resistant coatings based on [D]. University of Science and Technology of China, 2021. DOI: 10.27517 / d.cnki.gzkju.2021.000682.) By analyzing a single MoSi 2 coating, pointing to SiO 2 It is easy to decompose under ultra-high temperature (1800°C) and low oxygen pressure environment, and SiO 2 The fluidity at high temperature reduces the high temperature air erosion resistance of the silicide coating, which limits the application of a single silicide coating

Method used

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  • Preparation method of niobium alloy surface high-temperature oxidation resistant coating
  • Preparation method of niobium alloy surface high-temperature oxidation resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh MoSi with a particle size of 200 mesh 2 60 g of powder, 35 g of 300-mesh Al powder, and 5 g of 300-mesh Ce powder were added to a ball mill, mixed for 2 hours, and dried with a dryer to prepare composite powder for coating cladding.

[0035] will C 103 The niobium alloy was cut into a niobium alloy base material with a size of 20×20×20mm. After rough grinding the surface with 150-mesh metallographic sandpaper, it was first cleaned with acetone, wiped clean, and then wiped with anhydrous ethanol and dried to obtain Pretreated niobium alloy matrix material.

[0036] Put the composite powder for coating cladding into the powder cavity of the laser cladding device, adjust the laser cladding process parameters as laser power 1800W, spot diameter 4mm, scanning speed 5mm / s, scanning overlap rate 50%, and set the composite powder. The powder feeding rate was 30 mg / s, and the argon pressure was 0.8 MPa.

[0037] The pretreated niobium alloy base material was placed in a...

Embodiment 2

[0039] Weigh MoSi with a particle size of 200 mesh 2 50 g of powder, 40 g of 300-mesh Al powder, and 10 g of 300-mesh Ce powder were added to a ball mill, mixed for 2 hours, and dried with a dryer to prepare composite powder for coating cladding.

[0040] Put the composite powder for coating cladding into the powder cavity of the laser cladding device, adjust the laser cladding process parameters as laser power 2000W, spot diameter 4mm, scanning speed 7mm / s, scanning overlap rate 50%, and set the composite powder. The powder feeding rate was 40 mg / s, and the argon pressure was 0.8 MPa.

[0041] According to the method of Example 1, C 103 The niobium alloy is pretreated to obtain the pretreated niobium alloy base material. After preheating in a muffle furnace at 800 °C for 30 minutes, it is placed on the laser cladding worktable. The laser cladding method of coaxial powder feeding is used to melt the coating. The cladding composite powder is coated on the surface of the base ...

Embodiment 3

[0043] Weigh MoSi with a particle size of 200 mesh 2 45 g of powder, 45 g of 300-mesh Al powder, and 10 g of 300-mesh Ce powder were added to a ball mill and mixed for 2 hours, and dried with a dryer to prepare composite powder for coating cladding.

[0044] Put the composite powder for coating cladding into the powder cavity of the laser cladding device, adjust the laser cladding process parameters to the laser power of 2200W, the spot diameter of 4mm, the scanning speed of 10mm / s, the scanning overlap rate of 50%, and set the composite The powder feeding rate was 50 mg / s, and the argon pressure was 0.8 MPa.

[0045] According to the method of Example 1, C 103 The niobium alloy is pretreated to obtain the pretreated niobium alloy base material. After preheating in a muffle furnace at 800 °C for 30 minutes, it is placed on the laser cladding worktable. The laser cladding method of coaxial powder feeding is used to melt the coating. The cladding composite powder is coated on ...

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Abstract

The invention relates to a preparation method of a high-temperature oxidation resistant coating on a niobium alloy surface, which comprises the following steps: preparing composite powder for coating cladding by using 55-60 wt% of MoSi2 powder, 35-45 wt% of Al powder and 5-10 wt% of Ce powder, paving the composite powder for coating cladding on the surface of a niobium alloy matrix material, and forming a cladding coating on the surface of the niobium alloy matrix material by using a laser cladding technology. The niobium alloy surface high-temperature oxidation resistant coating prepared through the method is metallurgically bonded with a niobium alloy matrix, the hardness can reach nearly three times that of the niobium alloy matrix, and the oxidation resistance of the niobium alloy surface high-temperature oxidation resistant coating under the high-temperature environment of 1200 DEG C is also remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface coating material preparation, and relates to a method for preparing a coating on the surface of a niobium alloy, in particular to a method for preparing a high-temperature oxidation resistant coating on the surface of a niobium alloy by using laser cladding technology. Background technique [0002] Niobium alloy has excellent high temperature mechanical properties and machinability, moderate density, high melting point and strong solid solution ability. It is widely used in key components of rockets, spacecraft, missiles, high-speed aircraft and other equipment, and is expected to replace nickel-based and cobalt-based high temperature Alloys are used in ultra-high-speed aircraft engines and have broad application prospects. [0003] However, the oxidation resistance of niobium alloy materials is poor. Pure metal niobium oxidizes at 600℃. With the further aggravation of oxidation, the intern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F1/00
CPCC23C24/103
Inventor 李玉新赵学智田苗白培康段瑞斌赵英虎赵占勇王建宏
Owner ZHONGBEI UNIV
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