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High temperature oxidation-resistant material for low-density niobium alloy and method for preparing high temperature oxidation-resistant coating from high temperature oxidation-resistant material

A high-temperature anti-oxidation, niobium alloy technology, applied in heating inorganic powder coating and other directions, can solve the problem that the thermal expansion performance of anti-oxidation coating cannot meet the requirements of use, and achieve strong defect self-healing ability, excellent mechanical properties, surface uniform effect

Inactive Publication Date: 2012-10-10
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-density niobium alloys contain a large amount of light metal elements, which are quite different from other niobium alloys. Traditional anti-oxidation coatings cannot meet the requirements for thermal expansion or bonding with the substrate, so they must be combined with low-density niobium alloys. Development of anti-oxidation coating on the surface of niobium alloy

Method used

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  • High temperature oxidation-resistant material for low-density niobium alloy and method for preparing high temperature oxidation-resistant coating from high temperature oxidation-resistant material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The high-temperature anti-oxidation material contains the following components by weight percentage:

[0021] Nb: 2Wt%, Si: 13Wt%, B: 1.5Wt%, Ge: 2Wt%, Ti: 2.5Wt%, S: 0.30Wt%, Mo: 1.5Wt%, HfO 2 : 1Wt%, Fe: 3% W: 0.8Wt%, the balance is Al.

[0022] Make the above-listed components into a powder with a particle size of 450 mesh and put it into a container. Use absolute ethanol that is 4 times the volume of the aforementioned powder as a carrier, add 2.5% of the mass of the aforementioned powder to sodium chloride, and mix evenly. Polyethylene glycol with 0.25% of the total mass of the aforementioned powder was used as a binder, mixed with the coating powder and ground for 5 hours in a ball mill to obtain a slurry. Coating the coating slurry on the low-density niobium alloy substrate, the coating thickness is controlled at 100 microns, and then at a temperature of 1300 ° C, a vacuum greater than 1×10 -1 Carry out melting under Pa condition, keep warm for 25 minutes, fina...

Embodiment 2

[0030] Take a composite material of the following components:

[0031] Si is 13Wt%, Ti is 2.5Wt%, Mo is 1.5Wt%, HfO 2 1Wt%, W is 0.8Wt%, and the balance is Al.

[0032] Make the above composite material into a powder with a particle size of 400 mesh and put it into a container, use absolute ethanol with 3.5 times the volume of the aforementioned powder as a carrier, add 3.0% of the aforementioned powder mass of potassium chloride and mix evenly, and add an additional 0.3% of the aforementioned powder mass Mix evenly again after the polyethylene glycol, adopt ball mill to grind 4 hours and make coating slurry, then this coating slurry is coated on the low-density niobium alloy base material, coating thickness is controlled at 80 microns, at temperature 1350℃, vacuum greater than 1×10 -1 Melt and burn under Pa conditions, and keep warm for 15 minutes to form a high-temperature anti-oxidation coating.

Embodiment 3

[0034] Composite material with the following components:

[0035] B is 0.5Wt%, Si is 10Wt%, Ti is 2Wt%, Ge is 1.5Wt%, Mo is 1Wt%, HfO 2 0.8Wt%, W is 0.7Wt%, S is 0.25Wt%, and the balance is Al.

[0036]Make the above-mentioned composite material into a powder with a particle size of 350 mesh and put it into a container, use anhydrous ethanol that is 3 times the volume of the above-mentioned powder as a carrier, add 1.5% of the above-mentioned powder mass of sodium chloride and mix evenly, and add another 0.15% of the above-mentioned powder mass Mix evenly again after the polyethylene glycol, adopt ball mill to grind 3 hours and make coating slurry, then this coating slurry is coated on the low-density niobium alloy base material, coating thickness is controlled at 60 microns, at temperature 1200℃, vacuum greater than 1×10 -1 Melt and burn under Pa conditions, and keep warm for 10 minutes to form a high-temperature anti-oxidation coating.

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Abstract

The invention relates to a high temperature oxidation-resistant material for low-density niobium alloy and a method for preparing a high temperature oxidation-resistant coating from the high temperature oxidation-resistant material. The high temperature oxidation-resistant material is characterized by comprising the following components in weight percentage: 10-15wt% of Si, 2-3wt% of Ti, 1-2wt% of Mo, 0.8-1.2wt% of HfO2, 0.7- 0.9wt% of W and the balance of Al. The high temperature oxidation-resistant coating prepared from the high temperature oxidation-resistant material effectively solves the problem of severe oxidation of low-density niobium alloy in an atmospheric environment above 800-degree C, especially about 1100-degree C, keeps high-temperature mechanical properties of the low-density niobium alloy to the maximum extent, expands the application range of low-density niobium alloy and prolongs the service life of low-density niobium alloy; moreover, the high temperature oxidation-resistant coating prepared from the high temperature oxidation-resistant material has good high temperature oxidation resistance, a uniform coating surface and a dense microstructure.

Description

technical field [0001] The invention relates to a low-density niobium alloy high-temperature oxidation-resistant material and a method for preparing a high-temperature oxidation-resistant coating therefrom. Background technique [0002] Low-density niobium alloy: It is a niobium-titanium-aluminum-chromium alloy with good high-temperature strength, processing plasticity and medium-temperature oxidation resistance. This low-density niobium alloy is a new type of niobium alloy material for aerospace that was developed in the national military scientific research project in 2006 after C-103 and Nb521. The density of C-103 currently used in China is 8.86g / cm 3 , Nb521 density is 8.9g / cm 3 , while the density of niobium-titanium-aluminum-chromium alloy is 5.759g / cm 3 It is a typical low-density niobium-based alloy. Because the alloy has no grade at present, it is called low-density niobium alloy. [0003] Low-density niobium alloy is a niobium-titanium-aluminum-chromium alloy ...

Claims

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Application Information

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IPC IPC(8): C22C21/02C23C24/08
Inventor 周小军王莉王立斐赵刚郑爱国王秋迎于永祥
Owner NINGXIA ORIENT TANTALUM IND
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