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High-temperature anti-oxidization niobium alloy surface composite silicide coating and preparing method

A high-temperature anti-oxidation and surface composite technology, which is applied in metal material coating process, coating, superimposed layer plating and other directions to achieve the effect of excellent service effect, short preparation period and excellent high-temperature anti-oxidation performance.

Active Publication Date: 2017-09-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention develops a composite coating system suitable for high temperature resistance and long life surface thermal protection on the surface of niobium-based alloys

Method used

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  • High-temperature anti-oxidization niobium alloy surface composite silicide coating and preparing method
  • High-temperature anti-oxidization niobium alloy surface composite silicide coating and preparing method
  • High-temperature anti-oxidization niobium alloy surface composite silicide coating and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0044] Step 1: Pretreatment of the alloy matrix to prepare alloy surfaces with different roughness: cutting the refractory niobium alloy into 10×10×3mm by wire 3 After grinding the rounded corners with a high-speed grinding wheel, pickle with 40wt.% nitric acid for 10 minutes, and dry at 80°C; roughen the pickled niobium alloy with 30-mesh corundum sand with a pressure of 0.5MPa, and sandblast The angle is 45°, and the sandblasting distance is 10cm; after sandblasting, ultrasonically clean with absolute ethanol for 30min, and the ultrasonic power is 80W. For comparison, a part of the samples after pickling were mechanically ground and polished with No. 300, No. 500 and No. 800 water-grinding paper respectively, and the polished samples were cleaned with 80W ultrasonic; Samples were dried in an oven at 80°C for later use;

[0045] Step 2: Prepare Al-containing 2 o 3 NbSi adsorbed particles 2 Inner coating: Weigh 10% Si powder, 10% NH respectively according to mass fraction ...

Embodiment example 2

[0049] Step 1: Obtain a roughened alloy surface: Wire cut the refractory niobium alloy into 10×10×3mm 3 After grinding the rounded corners with a high-speed grinding wheel, pickle with 50wt.% nitric acid for 10 minutes, and dry at 80°C; roughen the pickled niobium alloy with 30-mesh corundum sand with a pressure of 0.6MPa, and sandblast The angle is 90°, and the sandblasting distance is 5cm; after sandblasting, ultrasonically clean with anhydrous ethanol for 30 minutes, and the ultrasonic power is 80W; the cleaned samples are dried in an oven at 80°C for later use;

[0050] Step 2: Prepare Al-containing 2 o 3 NbSi adsorbed particles 2 Inner coating: Weigh 5% Si powder, 5% NH respectively according to mass fraction 4 F and 90% Al 2 o 3 Add the powder into the ball mill tank and mill it for 1 hour to make the infiltrating powder, the ball milling speed is 70r / min; use the embedding method in Case 1 to put the roughened sample into the graphite crucible, and cover the crucib...

Embodiment example 3

[0054] Step 1: Obtain a roughened alloy surface: Wire cut the refractory niobium alloy into 10×10×3mm 3 After grinding the rounded corners with a high-speed grinding wheel, pickle with 45wt.% nitric acid for 10 minutes, and dry at 80°C; roughen the pickled niobium alloy with 30-mesh corundum sand with a pressure of 0.8MPa, and sandblast The angle is 90°, and the sandblasting distance is 5cm; after sandblasting, ultrasonically clean with anhydrous ethanol for 30 minutes, and the ultrasonic power is 80W; the cleaned samples are dried in an oven at 80°C for later use;

[0055] Step 2: Prepare Al-containing 2 o 3 NbSi adsorbed particles 2 Inner coating: Weigh 15% Si powder, 15% NH respectively according to mass fraction 4 F and 70% Al 2 o 3 Add the powder into the ball mill tank and mill it for 1 hour to make the infiltrating powder, the ball milling speed is 70r / min; use the embedding method in Case 1 to put the roughened sample into the graphite crucible, and cover the cruc...

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Abstract

The invention relates to a high-temperature anti-oxidization niobium alloy surface composite silicide coating and a preparing method. An Nb521 alloy is subjected to acid pickling, sand blasting, ultrasonic cleaning and drying to be used later. A halide gas phase pack seepage method is used for preparing an NbSi2 inner coating containing Al2O3 adsorption particles. An atmosphere inner powder sending supersonic speed plasma spraying method is used for preparing a MoSi2 outer coating. The high-temperature anti-oxidization niobium alloy surface composite silicide coating and the preparing method have the beneficial effects that compared with the heat oxidation performance of the publicly reported niobium alloy surface protection coating, the anti-oxidization performance of the niobium base alloy at the temperature of 1,500 DEG C is obviously improved through a composite coating system prepared through roughing siliconing and heat spraying, and the service life is longer than or equal to 128 h. According to a designed Al2O3 intermediate layer, an element barrier layer can be formed at the high temperature, and the phenomenon of coating erosion due to mutual diffusion of the coating elements can be effectively prevented.

Description

technical field [0001] The invention is in the field of surface engineering, and relates to a high-temperature anti-oxidation niobium alloy surface composite silicide coating and a preparation method, in particular to a refractory high-temperature niobium alloy surface NbSi 2 -Al 2 o 3 -MoSi 2 High-temperature anti-oxidation coating and preparation method thereof. Background technique [0002] The refractory high-temperature niobium alloy is considered to be the most likely candidate material for a new generation of engine blades that can replace the nickel-based ultra-high temperature alloy currently used most widely in the field of turbine blades. It has great application prospect. However, niobium-based alloys are prone to severe oxidation in a high-temperature aerobic environment, and there is a significant difference in the volume ratio of the oxide to the substrate, resulting in delamination of the oxide layer and the loss of its excellent high-temperature structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C8/62C23C24/08C23C4/10C23C4/134
CPCC23C4/10C23C4/134C23C8/62C23C24/08C23C28/04
Inventor 付前刚孙佳李贺军李涛王佩佩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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