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Preparation method and application of high-purity dense spherical molybdenum powder

A molybdenum powder and densification technology is applied in the field of spherical metal powder material preparation, which can solve the problems of difficult control of powder particle size, poor fluidity and low density of molybdenum powder, and achieves the effects of low cost, high density and less impurities

Active Publication Date: 2017-11-03
云航时代(重庆)科技有限公司
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing high-purity dense spherical molybdenum powder for the problems of poor fluidity, low density, high oxygen content, and difficulty in controlling the particle size of the molybdenum powder prepared by the existing production process.

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  • Preparation method and application of high-purity dense spherical molybdenum powder

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[0033] The embodiment of the present invention provides a preparation method of high-purity dense spherical molybdenum powder, comprising the following steps:

[0034] Step 1, mixing reduced molybdenum powder, binder and deionized water to make slurry;

[0035] Specifically, the reduced molybdenum powder described in the embodiment of the present invention is a molybdenum powder prepared by a conventional reduction process, and the preferred Fischer particle size range of the reduced molybdenum powder is 0.5 μm-6 μm, and the purity is greater than 99.9% in terms of mass percentage; The binding agent can be polyvinyl alcohol, polyethylene glycol, stearic acid, paraffin and other polymer bases and paraffin-based binding agents, preferably polyvinyl alcohol (PVA);

[0036] In the embodiment of the present invention, first mix the binder and deionized water uniformly to make solution A, then add reduced molybdenum powder into solution A, and stir it until it is evenly mixed to mak...

Embodiment 1

[0062] The preparation of high-purity dense spherical molybdenum powder for 3D printing with a particle size ranging from 10 μm to 20 μm comprises the following steps:

[0063] In step 1, conventional reduced molybdenum powder with a purity greater than 99.9% and a Fischer particle size range of 0.5 μm-1 μm is selected as the basic material. Polyvinyl alcohol was used as a binder, and it was uniformly mixed with deionized water to prepare solution A. The content of polyvinyl alcohol in solution A was 2% by mass fraction. Add the reduced molybdenum powder into the solution A, and mechanically stir until the mixture is evenly mixed to form a slurry B. The mass percentage of the solid phase of the slurry B is 30%.

[0064] Step 2. Spray and granulate the slurry B on a centrifugal spray dryer. The air inlet temperature of the spray drying is 170°C, the air outlet temperature is 130°C, the radius of the atomizing disc is 0.15m, and the rotation speed is 15000r / min. The pressure is...

Embodiment 2

[0073] The preparation of high-purity dense spherical molybdenum powder for 3D printing with a particle size of 20 μm-30 μm comprises the following steps:

[0074] In step 1, conventional reduced molybdenum powder with a purity greater than 99.9% and a Fischer particle size range of 2 μm-4 μm is selected as the basic material. Polyvinyl alcohol was used as a binder, and it was uniformly mixed with deionized water to prepare solution A, and the content of polyvinyl alcohol in solution A was 5% by mass fraction. Add the reduced molybdenum powder into the solution A, and mechanically stir until the mixture is evenly mixed to form a slurry B. The solid phase mass percentage of the slurry B is 40%.

[0075] Step 2. Spray and granulate the slurry B on a centrifugal spray dryer. The air inlet temperature of the spray drying is 200°C, the air outlet temperature is 150°C, the radius of the atomizing disc is 0.15m, and the rotation speed is 12000r / min. The pressure is 0.5MPa, and the o...

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Abstract

The invention provides a preparation method and application of high-purity dense spherical molybdenum powder and belongs to the technical field of spherical metal powder material preparation. Conventional reduction molybdenum powder serves as the raw material, the particle size range of the granulated molybdenum powder is controlled actively by adjusting the granulation process, the molybdenum powder subjected to degumming, impurity removal and sintering is further screened, the particle size of the granulated molybdenum powder before plasma spheroidizing is effectively controlled, and it is beneficial to granularity control over the final granulated molybdenum powder. The particle size distribution of the molybdenum powder subjected to granulation and screening processing is narrow, vaporization and the burning loss of the molybdenum powder in the plasma spheroidizing process can be effectively lowered in cooperation with spherification process parameters, such as the input power, the powder feeding rate and the gas flow, it is beneficial to stability of the production process, and production efficiency and product quality are greatly improved; through introduction of hydrogen gas into the degumming, impurity removal and sintering processes of the molybdenum powder, the impurity content of the molybdenum powder before spherification is effectively lowered; and meanwhile, screening, spherification, cooling and collection of the molybdenum powder are all operated under the protection atmosphere of argon gas, and the oxygen content of a product is effectively lowered.

Description

technical field [0001] The invention relates to a method for preparing high-purity dense spherical molybdenum powder for 3D printing with controllable particle size by using reduced molybdenum powder as a raw material, which belongs to the technical field of spherical metal powder material preparation. Background technique [0002] Molybdenum is an important refractory rare metal. It is widely used in aerospace, atomic energy, national defense, petrochemical, machinery manufacturing, electronic and electrical, Modern industrial technology fields such as metallurgy and iron and steel. With the rapid development of modern technology, especially high-end technologies such as electronic information and aerospace, the demand for high-performance and high-precision molybdenum products with complex shapes and uniform structures has increased dramatically. The additive manufacturing technology represented by 3D printing technology, due to its advantages of fast, flexible, material-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B22F1/00B33Y70/00C23C4/08
CPCC23C4/08B22F9/14B33Y70/00B22F1/065
Inventor 刘金涛陈连忠陈海群朱兴营周法马建平
Owner 云航时代(重庆)科技有限公司
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