Niobic alloy high temperature antioxidation silicide coating and preparation method thereof

A technology of niobium alloy and silicon oxide, which is applied in the field of preparation of high-temperature oxidation-resistant silicide coating of the niobium alloy, can solve the problems of the degradation of high-temperature mechanical properties of the substrate, affecting performance, poor high-temperature oxidation resistance, etc., and achieve the coating composition And the effect of uniform thickness, low equipment requirements and improved density

Inactive Publication Date: 2008-06-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Niobium alloy is an excellent high-temperature structural material widely used in aviation, aerospace, electronics, metallurgy and light industry, but its high-temperature oxidation resistance is poor, which strictly limits its application
Nickel-based and cobalt-based superalloys are the high-temperature structural materials with the best comprehensive performance at present, but their working temperature generally cannot exceed 1100°C; although silicon-based ceramic materials have high high-temperature strength, their working temperature can reach 1600°C, but Their room temperature toughness, fracture toughness and reliability are still difficult to meet the requirements of aerospace structural materials
Niobium alloys have a high melting point and high temperature strength, and are widely used in some high temperature resistant components in aviatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of the molybdenum layer on the surface of the niobium alloy substrate: molybdenum powder with a particle size of mostly 0.6-1.0 μm after ball milling is added with a binder of 0.2% by mass, which is polyvinyl butyral and dissolved in the mass In absolute ethanol with a percentage greater than 99.7%, prepare a slurry, dip or spray the molybdenum powder slurry on the niobium alloy substrate, prepare a molybdenum layer with a thickness of 50 μm on the niobium alloy substrate by vacuum slurry sintering method, and sinter The process is: the sintering temperature is 1500 ° C for 60 minutes, and the heating rate is 5 ° C per minute;

[0021] (2) Silicification: Then, under the protection of argon, MoSi is prepared by siliconization 2 Coating, infiltration activator is NaF, auxiliary agent is Al 2 o 3 , and Si:Al 2 o 3 The mass ratio of :NaF is 40:56:4, the infiltration temperature is 1250° C., and the siliconization time is 300 minutes.

[0022] Coating p...

Embodiment 2

[0026] (1) Preparation of the molybdenum layer on the surface of the niobium alloy substrate: after ball milling, molybdenum powder with a particle size mostly between 0.6 and 1.0 μm is added with a mass percentage of 0.1% as the binder is polyvinyl butyral and dissolved in the mass percentage In more than 99.7% absolute ethanol, prepare a slurry, dip or spray the molybdenum powder slurry on the niobium alloy substrate, and prepare a molybdenum layer with a thickness of 60 μm on the niobium alloy substrate by vacuum slurry sintering method. Sintering process It is: the sintering temperature is 1550°C and the temperature is kept for 55 minutes, and the heating rate is 6°C per minute;

[0027] (2) Silicification: Then, under the protection of argon, MoSi is prepared by siliconization 2 Coating, infiltration activator is NaF, auxiliary agent is Al 2 o 3 , and Si:Al 2 o 3 The mass ratio of :NaF is 35:61:4, the infiltration temperature is 1300° C., and the siliconization time i...

Embodiment 3

[0029] (1) Preparation of the molybdenum layer on the surface of the niobium alloy substrate: after ball milling, molybdenum powder with a particle size mostly between 0.6 and 1.0 μm is added with a mass percentage of 0.3% as the binder is polyvinyl butyral and dissolved in the mass percentage In more than 99.7% absolute ethanol, prepare a slurry, dip or spray the molybdenum powder slurry on the niobium alloy substrate, and prepare a molybdenum layer with a thickness of 80 μm on the niobium alloy substrate by vacuum slurry sintering method, sintering process For: the sintering temperature is 1450°C for 65 minutes, and the heating rate is 4°C per minute;

[0030] (2) Silicification: Then, under the protection of argon, MoSi is prepared by siliconization 2 Coating, infiltration activator is NaF, auxiliary agent is Al 2 o 3 , and Si:Al 2 o 3 The mass ratio of :NaF is 45:51:4, the infiltration temperature is 1200° C., and the siliconization time is 360 minutes.

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Abstract

The invention discloses a niobium alloy high temperature antioxidation silicide coating and a preparation method thereof. Firstly, molybdenum layers, the particle size of most of which is 0.6-1.0 Mu m and the thickness of which is 50 Mu m-80 Mu m, are sintered through vacuum on a niobium alloy substrate surface layer. Under the protection of argon, a MoSi2 coating is made through the pack cementation silicification. The pack cementation silicification activator is NaF, the promoter is Al2O3, and the weight ratio of Si to Al2O3 to NaF is 35-45 to 50-65 to 3-5. The complex pack cementation process is suitable for preparing the silicide coating with high melting point and can coat the inside and the external surface of irregular structural components without the influences of the shape and the size of the components. The components and the thickness of the coating prepared through the method are uniform. The density is greatly improved compared with that of a material pulp reaction sintering method. With simple process and low requirement on equipment, the invention is a novel high temperature coating preparation technology.

Description

technical field [0001] The invention relates to a niobium alloy high-temperature oxidation-resistant silicide coating, and also relates to a preparation method of the niobium alloy high-temperature oxidation-resistant silicide coating. Background technique [0002] Niobium alloy is an excellent high-temperature structural material widely used in aviation, aerospace, electronics, metallurgy and light industry, etc., but its high-temperature oxidation resistance is poor, which strictly limits its application. Nickel-based and cobalt-based superalloys are the high-temperature structural materials with the best comprehensive performance at present, but their working temperature generally cannot exceed 1100°C; although silicon-based ceramic materials have high high-temperature strength, their working temperature can reach 1600°C, but Their room temperature toughness, fracture toughness, and reliability are still difficult to meet the requirements of aerospace structural materials...

Claims

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Application Information

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IPC IPC(8): C23C28/00B22F7/02C23C10/44
Inventor 肖来荣易丹青蔡志刚许谅亮舒学鹏张路怀
Owner CENT SOUTH UNIV
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