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 and niobium alloy technology, which is applied in the direction of heating inorganic powder coating, etc., can solve the problem that the thermal expansion performance and combination performance of the anti-oxidation coating cannot meet the requirements of use, and achieve strong defect self-healing ability, uniform surface, and microstructure dense effect

Inactive Publication Date: 2013-11-13
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] Take a composite material of 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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Patent Type & Authority Patents(China)
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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