Preparation method of molybdenum-based material surface protection coating

A protective coating and molybdenum-based technology, which is applied in the coating process and coating of metal materials, can solve the problems of slow deposition rate of powder embedding method, limit the application range of embedding method, and low utilization rate of raw materials, etc., and achieve good Oxidation resistance, easy slurry composition, and production cost reduction effects

Active Publication Date: 2019-05-07
HENAN UNIV OF SCI & TECH
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Problems solved by technology

Using this method, uniform and dense MoSi with few defects can be prepared on the surface of molybdenum alloy. 2 coating, but the powder embedding method has the problem of slow deposition rate, and the use of powder to embed the sample makes the utilization rate of raw materials low. It needs to be equipped with a special mold, which is not suitable for the preparation of large-scale molybdenum device surface coatings, which limits The scope of application of the embedding method and the cost is relatively high

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  • Preparation method of molybdenum-based material surface protection coating
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  • Preparation method of molybdenum-based material surface protection coating

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[0026] The preparation method of the molybdenum-based material surface protective coating of the present invention includes the following steps: coating the siliconized slurry on the surface of the molybdenum-based material, drying it, placing it in a protective atmosphere, and heat preservation treatment at a temperature of 600-1300°C to form a siliconized coating. Silicon layer, to get final product; the siliconized slurry is mainly composed of Si powder, Na 2 SiF 6 , organic binder and solvent composition, the Si powder and Na 2 SiF 6 The mass ratio of the organic binder is (1~19):1, and the quality of the organic binder is Si powder and Na 2 SiF 6 0.1-3% of the total mass, Si powder and Na 2 SiF 6 The ratio of the total mass to the volume of the solvent is (1-5) g: 1 mL. The temperature of the drying treatment is 80-150°C. The drying time is 1.5-6 hours.

[0027] Preferably, the organic binder is ethyl cellulose, and the solvent is one of terpineol, toluene, xylene...

Embodiment 1

[0043] The preparation method of the molybdenum-based material surface protective coating of the present embodiment, its flow process is as follows figure 1 As shown, it specifically includes the following steps:

[0044] (1) Substrate pretreatment: TZM alloy plates (20mm×15mm×1mm) are firstly polished with 280# and 400# sandpaper to remove surface stains, and then washed in 4wt% NaOH aqueous solution at 75°C for 10min and 10vt% HCl aqueous solution was pickled in a 75°C water bath for 2 minutes to remove oil stains, and finally ultrasonically cleaned with distilled water and ethanol, and then dried in a 70°C drying oven to obtain alloy samples;

[0045] (2) Slurry preparation and coating: 50g Si powder (average particle size 35μm), 50g Na 2 SiF 6 Mix the powder evenly, add 0.1g ethyl cellulose and 100mL terpineol, stir magnetically in a water bath at 85°C for 2 hours to obtain a slurry, and coat the slurry evenly on the surface of the alloy sample with a coating thickness o...

Embodiment 2

[0050] The preparation method of the molybdenum-based material surface protective coating of the present embodiment comprises the following steps:

[0051] (1) Substrate pretreatment: TZM alloy plates (20mm×15mm×1mm) are firstly polished with 280# and 400# sandpaper to remove surface stains, and then washed in 4wt% NaOH aqueous solution at 60°C for 15min and 10vt% HCl aqueous solution was pickled in 80°C water bath for 10 minutes to remove oil stains, and finally ultrasonically cleaned with distilled water and ethanol, and then dried in a 60°C drying oven to obtain alloy samples;

[0052] (2) Slurry preparation and coating: 60g Si powder (average particle size 30μm), 40g Na 2 SiF 6 Mix the powder evenly, add 0.5g ethyl cellulose and 80mL terpineol, stir magnetically in a water bath at 60°C for 4 hours to obtain a slurry, and coat the slurry evenly on the surface of the alloy sample with a coating thickness of 1000μm; then place Dry in a drying oven at 130°C for 3 hours to ob...

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Abstract

The invention belongs to the technical field of high-temperature refractory metal surface oxidation resistance protection and particularly relates to a preparation method of a molybdenum-based material surface protection coating. The preparation method of the molybdenum-based material surface protection coating comprises the following steps of applying siliconizing slurry to the surface of a molybdenum-based material; and after drying treatment is completed, putting the molybdenum-based material in protective atmosphere, and conducting heat preservation treatment at the temperature of 600-1300DEG C, so that a siliconizing layer is formed. The siliconizing slurry is mainly composed of Si powder, Na2SiF6, an organic binding agent and solvent. The mass ratio of the Si powder to the Na2SiF6 is (1-19): 1; the mass of the organic binding agent accounts for 0.1-3% of the total mass of the Si powder and the Na2SiF6; and the ratio of the total mass of the Si powder and the Na2SiF6 to the volume of the Na2SiF6 is (1-5) g: 1 mL. By means of the preparation method, the defects that in the process that a coating is prepared through an embedding method, the raw material utilization rate is low,and a matched special embedding mold is needed are overcome; the siliconizing slurry is directly applied for heating, and MoSi2 is produced; and the process is simple, and the obtained protection coating is good in oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of anti-oxidation protection of high-temperature refractory metal surfaces, and in particular relates to a preparation method of a molybdenum-based material surface protective coating. Background technique [0002] Because of their excellent physical and chemical properties, molybdenum and molybdenum alloys are widely used in aerospace, national defense, electrical and electronic, metallurgy and glass industries. For example, the high-temperature molybdenum alloy (TZM alloy) material synthesized by adding Ti, Zr and other elements into pure molybdenum has been obtained in the high-temperature field because of its high recrystallization temperature, high-temperature strength, good low-temperature toughness and high-temperature creep resistance. It can be used in a wide range of applications, such as heat-resistant components for manufacturing nuclear energy, heat dissipation panels for spacecraft, gas pipes i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00C03C8/00
Inventor 刘伟曹俊李继文朱鹏飞徐流杰潘昆明张国赏魏世忠
Owner HENAN UNIV OF SCI & TECH
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