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Molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder and preparation method thereof

A spherical powder and molybdenum disilicide technology, which is applied in the field of composite powder materials, can solve the problems of anti-oxidation ablation coatings with many voids, roughness, and powders that are easily broken

Active Publication Date: 2021-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of the tantalum boride-hafnium carbide micro-agglomerated powder prepared by the above method is generally loose and rough, and the bonding strength is low. During the coating preparation process, the powder is easily broken during transportation and difficult to enter the plasma flame center. It is difficult to melt; and the anti-oxidation ablation coating prepared by the atmospheric plasma spraying system has problems such as many voids and loose structure

Method used

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  • Molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder and preparation method thereof
  • Molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder and preparation method thereof
  • Molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder and preparation method thereof

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preparation example Construction

[0027] The invention provides a preparation method of molybdenum disilicide-coated tantalum boride-hafnium carbide spherical powder, comprising the following steps:

[0028] (1) mixing tantalum boride, hafnium carbide, polyvinyl alcohol and absolute ethanol for the first ball milling to obtain the first mixed slurry;

[0029] (2) performing the first spray drying and granulation on the first mixed slurry to obtain an agglomerated powder;

[0030] (3) The agglomerated powder is subjected to induction plasma spheroidization treatment sequentially to obtain a tantalum boride-hafnium carbide spherical powder;

[0031] (4) mixing the tantalum boride-hafnium carbide spherical powder, molybdenum disilicide, water and polyvinyl alcohol for a second ball milling to obtain a second mixed slurry;

[0032] (5) The second mixed slurry is subjected to second spray-drying and granulation to obtain molybdenum disilicide-coated tantalum boride-hafnium carbide spherical powder.

[0033] In th...

Embodiment 1

[0049] (1) 65g of tantalum boride, 35g of hafnium carbide (the volume ratio of tantalum boride and hafnium carbide is 2.1:1), 1g of polyvinyl alcohol and 100g of absolute ethanol are prepared into a suspension, placed in a ball mill jar, and The material ratio is 4:1, and after ball milling for 3h at 250r / min, the first mixed slurry is obtained;

[0050] (2) Transfer the first mixed slurry obtained in step (1) to a spray drying granulation tower for agglomeration and granulation; wherein, the spray drying granulation parameters are: inlet temperature 210°C, outlet temperature 100°C, nozzle speed 25Hz , the speed of the peristaltic pump is 35rpm, the granulated powder is dried and passed through the inspection sieve to obtain BTa / HfC micron spherical agglomerated powder with a particle size of 20-100 μm, the drying temperature is 80°C, and the drying time is 24h.

[0051] (3) The agglomerated powder obtained in step (2) is sent to the induction plasma spheroidization equipment ...

Embodiment 2

[0058] (1) 65g of tantalum boride, 35g of hafnium carbide (the volume ratio of tantalum boride and hafnium carbide is 2.1:1), 3g of polyvinyl alcohol and 150g of absolute ethanol are prepared into a suspension, placed in a ball mill jar, and The material ratio is 4:1, and after ball milling at 100r / min for 6h, the first mixed slurry is obtained;

[0059] (2) Transfer the first mixed slurry obtained in step (1) to a spray drying granulation tower for agglomeration and granulation; wherein, the spray drying granulation parameters are: inlet temperature 300°C, outlet temperature 110°C, nozzle speed 29Hz , the speed of the peristaltic pump is 35rpm, the granulated powder is dried and passed through the inspection sieve to obtain BTa / HfC micron spherical agglomerated powder with a particle size of 20-100 μm, the drying temperature is 80°C, and the drying time is 24h.

[0060] (3) Send the agglomerated powder obtained in step (2) into an improved atmospheric plasma spray gun system ...

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Abstract

The invention relates to the technical field of composite powder materials, and provides a molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder and a preparation method thereof. A tantalum boride-hafnium carbide agglomerated powder is prepared through ball milling and spray drying granulation, then the agglomerated powder is subjected to induction plasma spheroidizing treatment, sintering densification of the powder is achieved, and then the surface of the obtained tantalum boride-hafnium carbide spherical powder is coated with a molybdenum disilicide coating layer to obtain the molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder with the core-shell structure. The prepared molybdenum disilicide coated tantalum boride-hafnium carbide spherical powder is high in density and cohesion, high in sphericity degree and good in fluidity and meets the requirement of plasma spraying for powder, the melting point of molybdenum disilicide is lower than that of tantalum boride, in the plasma spraying process, melting can be more sufficient, the compactness of a coating is improved, the molybdenum disilicide coating layer can also inhibit volatilization of hafnium carbide in the plasma spraying process, and the loss of hafnium carbide is reduced.

Description

technical field [0001] The invention relates to the technical field of composite powder materials, in particular to a molybdenum disilicide-coated tantalum boride-hafnium carbide spherical powder and a preparation method thereof. Background technique [0002] With the development of aerospace technology, the speed of aircraft is getting faster and faster, and the temperature inside the engine and the surface of the substrate is getting higher and higher. Traditional superalloys have long been unable to meet the use requirements. High-speed engines require materials with high strength, low density, excellent thermal shock resistance, corrosion resistance, and oxidation resistance. Usually, a layer of coating is prepared on the surface of the substrate to improve the strength, heat resistance, and corrosion resistance of the substrate. performance. [0003] Tantalum boride (TaB) is a simple close-packed hexagonal metal structure compound, which has the advantages of high melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58064C04B35/622C04B2235/3839C04B2235/3418C04B2235/6562C04B2235/6567C04B2235/666C04B2235/94C04B2235/95
Inventor 柳彦博马壮刘玲高丽红朱时珍委思豪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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