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Molybdenum-alloy MoSi2-ZrO2-Y2O3 coating, preparation method therefor and application of molybdenum-alloy MoSi2-ZrO2-Y2O3 coating

A mosi2-zro2-y2o3, molybdenum alloy technology, applied in the field of ultra-high temperature anti-oxidation coating preparation, can solve the problems of reduced Si element concentration, cracks, poor anti-oxidation performance, etc., to achieve good thermal matching, low evaporation rate, The effect of reducing the oxygen diffusion coefficient

Active Publication Date: 2016-11-16
CENT SOUTH UNIV
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Problems solved by technology

A large number of scientific research institutes such as China National Institute of Aerospace Materials and Central South University have carried out the research and development of molybdenum alloy silicide coatings. In the existing molybdenum alloy protective silicide coating system, MoSi 2 Coating is the main coating system used, but it currently has the following problems: (1) There is still a certain thermal stress between the coating and the substrate. At the ductile-brittle transition temperature, due to the MoSi 2 Poor plasticity, thermal stress exceeds that of MoSi 2 cracks
(2) During the high temperature oxidation process, MoSi 2 The Si in the coating has a secondary diffusion phenomenon, resulting in a decrease in the Si element concentration in the coating, and MoSi 2 Convert to Mo 5 Si 3 , thereby reducing the high temperature oxidation resistance of the coating
(3) The low-temperature oxidation resistance of MoSi2 is poor. Due to the low diffusion rate of Si element at low temperature, the reaction with O is slow and complete SiO cannot be formed. 2 thin film, leading to chalking and oxidation of the coating
[0005] Through the above search and analysis, it can be found that the current technology mainly focuses on the research of anti-oxidation coatings at temperatures below 1700 °C, while there are few reports and applications of high-temperature anti-oxidation coatings at temperatures above 1700 °C.

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  • Molybdenum-alloy MoSi2-ZrO2-Y2O3 coating, preparation method therefor and application of molybdenum-alloy MoSi2-ZrO2-Y2O3 coating
  • Molybdenum-alloy MoSi2-ZrO2-Y2O3 coating, preparation method therefor and application of molybdenum-alloy MoSi2-ZrO2-Y2O3 coating
  • Molybdenum-alloy MoSi2-ZrO2-Y2O3 coating, preparation method therefor and application of molybdenum-alloy MoSi2-ZrO2-Y2O3 coating

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Experimental program
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Effect test

Embodiment 1

[0053] (1) Pretreatment of molybdenum alloy substrate: Molybdenum alloy substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali cleaning are performed, and the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 11, then ultrasonically cleaned in alcohol, and then put into a drying box for drying.

[0054] (2) Slurry preparation: MoSi with a particle size of 0.6 μm 2 Powder, ZrO with a particle size of 200nm 2 Powder and Y with a particle size of 100nm 2 o 3 Powder by mass percentage MoSi 2 60%, ZrO 230%, Y 2 o 3 9%, 1% of additives (including Si0.5%, SiC 0.5%, particle size 1μm) (the purity of the above substances is not less than 99.7%), put them into a ball mill jar, and the PVB mass percentage is 0.2%. The ethanol solution was used as a dispersant, the cemented carbide ball was used as a grinding ball, and the slurry was obtained by wet ball milling for...

Embodiment 2

[0059] (1) Pretreatment of molybdenum alloy substrate: Molybdenum alloy substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali cleaning are performed, and the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is a NaOH solution with a pH value of 12, and then ultrasonically cleaned in alcohol, then put into a drying box for drying.

[0060] (2) Slurry preparation: MoSi with a particle size of 1.2 μm 2 Powder, ZrO with a particle size of 240nm 2 Powder and Y with a particle size of 150nm 2 o 3 Powder by mass percentage MoSi 2 77%, ZrO 2 10%, Y 2 o 3 10%, 3% additives (including Si 2%, SiC 1%, particle size 0.1μm) (the purity of the above substances is not less than 99.6%), put it into a ball mill jar, and the PVB mass percentage is 0.2% Ethanol solution was used as dispersant, cemented carbide balls were used as grinding balls, and wet ball milled for 12 hours to obtain slurry; the amount ...

Embodiment 3

[0065] (1) Pretreatment of molybdenum alloy substrate: Molybdenum alloy substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali cleaning are performed, and the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 13, then ultrasonically cleaned in alcohol, and then put into a drying box for drying.

[0066] (2) Slurry preparation: MoSi with a particle size of 2 μm 2 Powder, ZrO with a particle size of 300nm 2 Powder and Y with a particle size of 200nm 2 o 3 Powder by mass percentage MoSi 2 80%, ZrO 2 13%, Y 2 o 3 5%, 2% additives (including Si 1.5%, SiC 0.5%, particle size 0.5μm) (the purity of the above substances is not less than 99.5%), put it into a ball mill jar, and the PVB mass percentage is 0.2% The ethanol solution is used as a dispersant, the cemented carbide ball is used as a grinding ball, and the slurry is obtained by wet ball milling for 15 ho...

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Abstract

The invention relates to a molybdenum-alloy-material MoSi2-ZrO2-Y2O3 coating, a preparation method therefor and an application of the molybdenum-alloy-material MoSi2-ZrO2-Y2O3 coating and belongs to the technical field of preparation of ultrahigh-temperature oxidation-resistant coatings. The coating disclosed by the invention contains the following ingredients in percentage by mass: 60% to 80% of MoSi2, 10% to 30% of ZrO2, 5% to 10% of Y2O3 and 1% to 3% of additive, wherein the additive is at least one selected from Si powder and SiC powder. The preparation method comprises the steps: weighing the raw materials according to the designed ingredients, then, carrying out wet-process ball-milling so as to prepare slurry; and then, coating the surface of molybdenum alloy with the slurry, and carrying out vacuum sintering for 40 to 100 minutes at the temperature of 1,550 DEG C to 1,650 DEG C, thereby preparing the coating. According to the coating disclosed by the invention, the ingredient design is reasonable, the preparation process is simple, the production cost is low, the coating is dense and uniform and has high bonding strength with the molybdenum alloy and a coefficient of thermal expansion matched with the molybdenum alloy, and thus the ultrahigh-temperature oxidation resistance of the molybdenum alloy can be effectively improved.

Description

technical field [0001] A kind of molybdenum alloy material MoSi of the present invention 2 -ZrO 2 -Y 2 o 3 The coating and its preparation method and application; belong to the technical field of ultra-high temperature anti-oxidation coating preparation. Background technique [0002] Molybdenum alloy is an excellent structural material with high melting point, high hardness and high strength, which can be widely used in aerospace, military industry, electronics, metallurgy and other fields, especially in aerospace vehicles. However, the oxidation resistance of this material is poor. At 200°C, molybdenum begins to oxidize, and a film-like oxide layer will be formed on the surface; when the temperature continues to rise and reaches above 700°C, the oxide MoO on the surface of molybdenum 2 and MoO 3 A eutectic reaction will occur, causing the surface layer to fall off, greatly reducing the performance of the material. However, with the rapid development of the current aer...

Claims

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Application Information

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IPC IPC(8): C04B35/58
CPCC04B35/58092C04B2235/3225C04B2235/3244
Inventor 肖来荣蔡圳阳宋宇峰唐新阳赵小军张贝胡子首明铭
Owner CENT SOUTH UNIV
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