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A composite protective coating integrating anti-oxidation and interfacial diffusion resistance and its preparation method

A technology of protective coating and anti-diffusion layer, which is applied in the field of composite protective coating and its preparation, can solve the problems of coating interface holes, limited diffusion resistance, poor interface bonding and compatibility, etc., to achieve enhanced interface bonding, good Protective effect, the effect of prolonging the service life

Active Publication Date: 2021-12-28
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the silicide coating has the following problems when it is served at high temperature: (1) The interdiffusion of interface elements induces the formation of internal defects in the anti-oxidation coating, and a large number of pores appear at the coating interface
However, a single refractory metal or noble metal barrier layer has good interfacial bonding, but limited diffusion resistance; oxide and ceramic layers have excellent interfacial diffusion resistance, but poor interfacial bonding and compatibility

Method used

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  • A composite protective coating integrating anti-oxidation and interfacial diffusion resistance and its preparation method
  • A composite protective coating integrating anti-oxidation and interfacial diffusion resistance and its preparation method
  • A composite protective coating integrating anti-oxidation and interfacial diffusion resistance and its preparation method

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Embodiment 1

[0032] A method for preparing a composite protective coating integrating anti-oxidation and interfacial diffusion resistance, the specific steps are as follows:

[0033] (1) Preparation of high-entropy alloy powder: Weigh W, Mo, Nb, Ta, and V five metal powders in equimolar ratio, then put the above five powders into a ball mill jar, and weigh them according to the ball-to-material ratio of 15:1 Take the balls and put them into the ball milling pot, then pass high-purity argon gas into the ball milling pot, and use a planetary ball mill for ball milling. The ball milling parameters are: ball milling time 40h, ball milling speed 400r / min;

[0034] (2) Preparation of the high-entropy alloy diffusion-resistant intermediate layer on the surface of the niobium base: the high-entropy alloy powder obtained in step (1) is coated around the niobium base, and a high-entropy alloy diffusion-resistant layer is prepared on the surface of the niobium base by spark plasma sintering. Sinterin...

Embodiment 2

[0041] A method for preparing a composite protective coating integrating anti-oxidation and interfacial diffusion resistance, the specific steps are as follows:

[0042] (1) Preparation of high-entropy alloy powder: Weigh W, Mo, Nb, Ta, and V five metal powders in equimolar ratio, then put the above five powders into a ball mill jar, and weigh them according to the ball-to-material ratio of 15:1 Take the balls and put them into the ball milling pot, then pass high-purity argon gas into the ball milling pot, and use a planetary ball mill for ball milling. The ball milling parameters are: ball milling time 40h, ball milling speed 400r / min;

[0043] (2) Preparation of the high-entropy alloy diffusion-resistant intermediate layer on the surface of the niobium base: the high-entropy alloy powder obtained in step (1) is coated around the niobium base, and a high-entropy alloy diffusion-resistant layer is prepared on the surface of the niobium base by spark plasma sintering. Sinterin...

Embodiment 3

[0050] A method for preparing a composite protective coating integrating anti-oxidation and interfacial diffusion resistance, the specific steps are as follows:

[0051] (1) Preparation of high-entropy alloy powder: Weigh W, Mo, Nb, Ta, and V five metal powders in equimolar ratio, then put the above five powders into a ball mill jar, and weigh them according to the ball-to-material ratio of 15:1 Take the balls and put them into the ball milling pot, then pass high-purity argon gas into the ball milling pot, and use a planetary ball mill for ball milling. The ball milling parameters are: ball milling time 40h, ball milling speed 400r / min;

[0052] (2) Preparation of the high-entropy alloy diffusion-resistant intermediate layer on the surface of the niobium base: the high-entropy alloy powder obtained in step (1) is coated around the niobium base, and a high-entropy alloy diffusion-resistant layer is prepared on the surface of the niobium base by spark plasma sintering. Sinterin...

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Abstract

The invention discloses a composite protective coating integrating anti-oxidation and interfacial diffusion resistance and a preparation method thereof. The composite protective coating of the present invention includes a middle high-entropy alloy diffusion-resistant layer and an outermost molybdenum disilicide anti-oxidation layer, and its preparation method includes the preparation of high-entropy alloy powder and the preparation of a niobium-based surface high-entropy alloy diffusion-resistant intermediate layer And the preparation of high-temperature anti-oxidation coating of molybdenum disilicide on the surface of high-entropy alloy diffusion resistance layer. The composite protective coating of the present invention is used to improve the high-temperature oxidation resistance of niobium-based alloys and prevent the diffusion between niobium-based and oxidation-resistant coatings, prolong the service life of the coating, and has superior high-temperature oxidation resistance and prevents interface elements The ability to interdiffuse.

Description

technical field [0001] The invention relates to a high-temperature protective coating, in particular to a composite protective coating integrating oxidation resistance and interfacial diffusion resistance and a preparation method thereof. Background technique [0002] Superalloys are important materials for manufacturing high-temperature structural parts in the aerospace field. Due to the limitation of the melting point of the nickel-based single crystal superalloy currently used, the upper limit of the continuous use temperature is only 1100°C. With the rapid development of aerospace technology, there is an urgent need for ultra-high temperature metal materials used in the range of 1100-1400 °C to replace the currently used nickel-based single crystal superalloy high-temperature structural materials. Niobium and niobium alloys have a high melting point, moderate density, corrosion resistance, high-temperature mechanical properties and good machinability. They are one of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00B22F9/04B22F3/105B22F1/02C23C26/00
CPCC22C30/00B22F9/04B22F3/105C23C26/00B22F2009/043B22F1/16
Inventor 颜建辉李茂键康蓉
Owner HUNAN UNIV OF SCI & TECH
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