High-temperature oxidation resistant coating on niobium alloy surface and preparation method of high-temperature oxidation resistant coating

A high-temperature anti-oxidation and niobium alloy technology, which is applied to the high-temperature anti-oxidation coating on the surface of niobium alloy and the field of high-temperature anti-oxidation protection. , to achieve the effect of improving strength and toughness, improving thermal cycle life, improving oxidation resistance and high temperature stability

Inactive Publication Date: 2015-04-29
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But MoSi 2 Very brittle at room temperature, oxidized at low temperature (300-700°C), low in strength at high temperature (above 1250°C)
The niobium alloy high-temperature oxidation-resistant coatings obtained in the above-mentioned prior art are all single-layer coatings, and cannot be used in an aerobic environment with a temperature higher than 1400 ° C. Therefore, MoSi 2 Modified to meet its use requirements in high temperature aerobic environment

Method used

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  • High-temperature oxidation resistant coating on niobium alloy surface and preparation method of high-temperature oxidation resistant coating
  • High-temperature oxidation resistant coating on niobium alloy surface and preparation method of high-temperature oxidation resistant coating
  • High-temperature oxidation resistant coating on niobium alloy surface and preparation method of high-temperature oxidation resistant coating

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preparation example Construction

[0036] In the preparation of the coating

[0037]The niobium alloy surface high temperature anti-oxidation coating of the present invention prepares the bottom Mo 1-x W x (Si 1-y-z al y B z ) 2 Coating, and surface layer Mo 1-x W x (Si 1-y-z al y B z ) 2 -(10-20)%wtHfSi 2 Coating, where:

[0038] 1) Bottom Mo 1-x W x (Si 1-y-z al y B z ) 2 The coating is prepared by high-energy plasma spraying process. Mo required 1-x W x (Si 1-y-z al y B z ) 2 The spray powder material is prepared by self-propagating process. Preparation of Mo by self-propagating process 1-x W x (Si 1-y-z al y B z ) 2 Coating powder material method is as follows: Mo powder (Mo content 99.99%, powder particle size 1 ~ 3μm), W powder (W content 99.99%, powder particle size 1 ~ 3μm), Si powder (Si content 99.99%, powder particle size 1 ~ 3μm), Al powder (Al content 99.9%, powder particle size 1-3μm), B powder (B content 99.9%, powder particle size 1-3μm) according to Mo 1-x W x ...

Embodiment

[0048] The present invention provides embodiment 1-5, and the chemical composition of each embodiment is as shown in table 3, adopts following process to prepare:

[0049] 1. Powder preparation

[0050] Mo 1-x W x (Si 1-y-z al y B z ) 2 The chemical composition of the powder materials is shown in Table 3.

[0051] Table 3 Mo 1-x W x (Si 1-y-z al y B z ) 2 Chemical composition of powder materials and corresponding mole percentages

[0052]

[0053] Prepare Mo powder, W powder, Si powder, Al powder, and B powder according to the molar percentages shown in Table 1, and add appropriate amount of alcohol and ZrO 2 Grinding balls, the mass ratio of balls to materials is 3:1, put them into a ball mill tank, and use a high-energy ball mill to mill for 16 hours to fully mix the powder. After the grinding balls are taken out, the powder material is dried and compacted at low temperature to ensure that the compacted density is greater than 40%, and then placed in a self-...

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Abstract

The invention belongs to the field of thermal spraying, and relates to a high-temperature oxidation resistant coating on a niobium alloy surface and a preparation method of the high-temperature oxidation resistant coating. The coating is in a dual-layer structure with a bottom coating Mo1-xWx(Si1-y-zAlyBz)2 and a surface coating Mo1-xWx(Si1-y-zAlyBz)2-(10-20)%wt HfSi2, and prepared on a niobium alloy matrix surface by a high-energy plasma spraying process, wherein a bottom coating powder material Mo1-xWx(Si1-y-zAlyBz)2 is prepared by a self-propagating process, and the spherical particles meeting the requirements of the spraying process are obtained by applying a plasma spheroidizing process; surface coating powder materials Mo1-xWx(Si1-y-zAlyBz)2 and HfSi2 are mixed evenly in a mechanical mixing manner. The coating has excellent high-temperature oxidation resistance at 1500-1800 DEG C, and can be applied to high-temperature protection of niobium alloy parts.

Description

technical field [0001] The invention belongs to the field of thermal spraying, and relates to a high-temperature anti-oxidation coating on the surface of a niobium alloy, and is particularly suitable for high-temperature anti-oxidation protection on the surface of a niobium alloy substrate of key components such as rocket engines, missiles, nuclear reactor aircraft wings and rudders. Background technique [0002] Niobium alloy has the advantages of excellent high-temperature mechanical properties, high melting point, and strong solid solution ability, and can be used to prepare key components such as rocket engines, missiles, nuclear reactors, aircraft wings, and rudders. However, the oxidation resistance of niobium alloys is poor, and pure metal niobium will be oxidized at 600°C, which seriously affects its application in high-temperature aerobic environments. Therefore, it is necessary to improve the high-temperature oxidation resistance of niobium alloys to expand their a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/134
CPCC23C4/06
Inventor 吕艳红王全胜吴子健侯东辉唐建新王玮
Owner CHINA IRON & STEEL RES INST GRP
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