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Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating

A niobium-based alloy, mo-si-b technology, applied in the field of high-temperature oxidation-resistant coatings, can solve the problems of reduced strength of the base metal, high processing temperature, and long time, and achieve high-temperature oxidation resistance and flow improvement properties, viscosity-lowering effect

Inactive Publication Date: 2014-10-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high temperature and long time of the embedding infiltration method, the strength and other properties of the matrix metal may be reduced.

Method used

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  • Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating
  • Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating
  • Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating

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preparation example Construction

[0033] The invention relates to a method for preparing a Mo-Si-B coating on an Nb-based superalloy by combining plasma spraying and embedding infiltration technology. The coating preparation method has the following steps:

[0034] The first step: pretreatment of the substrate

[0035] (A) Nb-16Si-22Ti-17Cr-2Al-2Hf alloy matrix is ​​carried out surface polishing treatment with SiC water abrasive paper of 800#, makes the first sample;

[0036] The surface roughness of the first sample is Ra=1.6~2.0;

[0037] (B) Put the first sample into absolute ethanol and perform ultrasonic cleaning for 10 to 20 minutes to obtain the second sample;

[0038] In the present invention, the purpose of grinding and cleaning the substrate is to obtain a clean surface with a certain roughness, and the surface of the substrate with a small roughness is conducive to the compact deposition of the Mo material.

[0039] The second step: plasma spraying Mo layer

[0040] The second sample was sprayed ...

Embodiment 1

[0058] The first step: pretreatment of the substrate

[0059] (A) Nb-16Si-22Ti-17Cr-2Al-2Hf alloy matrix is ​​carried out surface polishing treatment with the SiC water abrasive paper of 800#, makes the first sample; The surface roughness of described first sample is Ra= 1.6;

[0060] (B) The first sample is put into absolute ethanol, and after ultrasonic cleaning is carried out for 15 minutes under the condition of ultrasonic frequency of 30 KHz, the second sample is obtained by natural air drying after cleaning;

[0061] The second step: plasma spraying Mo layer

[0062] The second sample was sprayed with atmospheric plasma to form a Mo layer to obtain the third sample;

[0063] The particle size of Mo powder is 100μm;

[0064] Atmospheric plasma spraying process parameters: the current of atmospheric plasma spraying is 450 A, the voltage is 65 V, the flow rate of argon gas is 60 l / min, and the flow rate of hydrogen gas is 20 l / min; the average temperature of the substrat...

Embodiment 2

[0083] The first step: pretreatment of the substrate

[0084] (A) Nb-16Si-22Ti-17Cr-2Al-2Hf alloy matrix is ​​carried out surface polishing treatment with the SiC water abrasive paper of 800#, makes the first sample; The surface roughness of described first sample is Ra= 1.8;

[0085] (B) After the first sample was put into absolute ethanol and ultrasonically cleaned for 15 minutes, the second sample was obtained;

[0086] The second step: plasma spraying Mo layer

[0087] The second sample was sprayed with atmospheric plasma to form a Mo layer to obtain a third sample;

[0088] The particle size of Mo powder is 75μm;

[0089] Atmospheric plasma spraying process parameters: the current of atmospheric plasma spraying is 450 A, the voltage is 65 V, the flow rate of argon gas is 60 l / min, and the flow rate of hydrogen gas is 20 l / min; the average temperature of the substrate surface during the deposition process is 300 °C; the spraying distance is 100 mm, and the powder feedi...

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Abstract

The invention discloses a Mo-Si-B coating on niobium-based alloy and a preparation method of the Mo-Si-B coating. The method comprises the steps of firstly, preparing a Mo layer on a Nb-based alloy by using an atmospheric plasma spraying process; then, enabling Si-B to be infiltrated to the Mo layer by using a pack cementation process to obtain a composite Mo-Si-B coating. Mo reacts with Si-B in the pack cementation process to generate MoSi2 and dispersed B. The Mo-Si-B coating disclosed by the invention is 100-140mu m thick and is structurally composed of the Mo layer in contact with a Nb-based alloy matrix and a MoSi2+B dispersed phase layer distributed outside the Mo layer. The coating can form a continuous, compact and good-cohesiveness borosilicate oxide layer when oxidizing at high temperature of 1250 DEG C, so that the high temperature oxidation resistance of the matrix is improved.

Description

technical field [0001] The present invention relates to a high-temperature oxidation-resistant coating, more particularly, refers to a composite Mo-Si-B coating prepared by spraying first and then embedding, specifically, the inner Mo layer of the coating, and the outer Mo layer. Layer is MoSi 2 +B dispersed phase layer. Background technique [0002] Nb-16Si-22Ti-17Cr-2Al-2Hf alloy has high melting point, good ductility and thermal conductivity, high strength and specific strength, and moderate density, so this alloy is the most promising ultra-high temperature metal structure material to replace nickel-based superalloys. However, the Nb-16Si-22Ti-17Cr-2Al-2Hf alloy will be violently oxidized in air above 600 °C, so that it cannot be used in an oxygen-containing environment without protection. An effective measure to solve this problem is to prepare a high-temperature protective coating on the surface of the alloy. [0003] Plasma spraying is a material surface strengthen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/08C23C8/72C23C4/134
Inventor 周春根王皖吴晶艳
Owner BEIHANG UNIV
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