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Method for preparing molybdenum silicide coating on surface of molybdenum or molybdenum alloy

A technology of molybdenum alloy and molybdenum silicide, which is applied in the field of high-temperature protective coatings, can solve the problems of further improvement and large difference in thermal expansion coefficients, and achieve good high-temperature oxidation resistance, reduce thermal expansion coefficient mismatch, and high efficiency.

Active Publication Date: 2018-02-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MoSi prepared by a single plasma spraying technique 2 The bonding mode between the coating and the Mo matrix is ​​mainly mechanical occlusion, and there is a relatively obvious interface. Due to the large difference in thermal expansion coefficient (Mo: 5.2×10 -6 ·K -1 , MoSi 2 : 8.8×10 -6 ·K -1 ), so that the bonding performance between the coating and the substrate and the thermal shock resistance need to be further improved

Method used

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  • Method for preparing molybdenum silicide coating on surface of molybdenum or molybdenum alloy
  • Method for preparing molybdenum silicide coating on surface of molybdenum or molybdenum alloy
  • Method for preparing molybdenum silicide coating on surface of molybdenum or molybdenum alloy

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preparation example Construction

[0030] Preparation of silicon coating. Specifically, select silicon powder with a certain particle size distribution and purity, and use plasma spraying technology to prepare a certain thickness of silicon coating on the surface of molybdenum or molybdenum alloy. Among them, the particle size of the selected silicon powder is 10-120 μm, and the purity is greater than 98wt.%. Dry the silicon powder at 100-120°C for 1-3 hours and set aside. The silicon powder is sprayed onto the molybdenum or molybdenum alloy surface by plasma spraying technology to form a silicon coating, and the thickness of the silicon coating is 30-300 μm. The process parameters of plasma spraying silicon coating include: plasma gas Ar: 30-50 slpm (standard liter / min); plasma gas H 2 : 6~15slpm; powder carrier gas Ar: 2~7slpm; spraying distance: 100~200mm; spraying power: 30~50kW; powder feeding rate: 10~30rpm (rev / min). In the invention, by controlling the process parameters of the plasma spraying techno...

Embodiment 1

[0039] A molybdenum silicide coating on a molybdenum metal surface, the preparation of the coating comprises the steps of:

[0040] 1) Sandblasting the surface of the Mo metal substrate with a sandblasting pressure of 0.4 MPa, ultrasonicating twice in absolute ethanol solution for 5 minutes each time, drying at 100°C for 2 hours, and set aside;

[0041] 2) Use silicon powder with a median particle size of about 30 μm and a purity greater than 98wt.% as the raw material for spraying, dry at 100°C for 3 hours, and set aside;

[0042] 3) Using a plasma spraying system (A-2000, Sulzer Metco AG, Switzerland), select the process parameters in Table 2, spray silicon powder onto the surface of the Mo substrate to form a silicon coating, the thickness of the silicon coating is about 110 μm, figure 1 The XRD results show that the silicon coating is a cubic phase;

[0043] Table 2 is the plasma spraying Si coating process parameters:

[0044]

[0045] 4) A vacuum-atmosphere sinterin...

Embodiment 2

[0061] A molybdenum silicide coating on a molybdenum metal surface, the preparation of the coating comprises the steps of:

[0062] 1) Sandblasting the surface of the Mo metal substrate with a sandblasting pressure of 0.4 MPa, ultrasonicating twice in an anhydrous ethanol solution for 5 minutes each time, drying at 100°C for 2 hours, and set aside;

[0063] 2) Use silicon powder with a median particle size of about 30 μm and a purity greater than 98wt.% as the raw material for spraying, dry at 100°C for 3 hours, and set aside;

[0064] 3) Using plasma spraying technology and selecting the process parameters in Table 4, silicon powder is sprayed onto the surface of the Mo substrate to form a silicon coating. The thickness of the silicon coating is about 60 μm, and the silicon coating is a cubic phase;

[0065] Table 4 is the process parameter of plasma spraying Si coating:

[0066]

[0067]

[0068] 4) A vacuum-atmosphere sintering furnace protected by argon gas is used ...

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Abstract

The invention relates to a method for preparing a molybdenum silicide coating on the surface of molybdenum or a molybdenum alloy. Silicon powder serves as a raw material, a plasma spraying technologyis adopted to prepare the silicide coating on the surface of the molybdenum or a molybdenum alloy matrix, then, heat treatment is carried out for 1-10 hours under the inert atmosphere at the temperature of 1,000 DEG C-1,500 DEG C, and therefore the molybdenum silicide coating is formed on the surface of the molybdenum or the molybdenum alloy. The preparation method has the advantages that the process is simple, the cost is low, the efficiency is high, repeatability is good, and method is suitable for scale production.

Description

technical field [0001] The invention relates to a method for preparing a silicide coating, in particular to a method for preparing a molybdenum silicide coating on the surface of molybdenum or a molybdenum alloy, and belongs to the technical field of high-temperature protective coatings. Background technique [0002] Molybdenum (Mo) and its alloys are one of the important high-temperature structural materials. However, when the temperature of the aerobic environment is about 500 ° C, Mo will be oxidized, and as the temperature increases, the degree of oxidation will intensify, and the formed oxide (MoO 3 ) is easy to volatilize, leading to the loose structure of Mo, which eventually leads to material failure, which greatly limits the application of Mo as a high-temperature material. In order to improve its high temperature and oxidation resistance, a more feasible method is to prepare a high temperature and oxidation resistance coating on its surface. [0003] Molybdenum d...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/10C23C4/18
CPCC23C4/10C23C4/134C23C4/18
Inventor 牛亚然翟翠红赵君李红郑学斌孙晋良丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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