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A kind of preparation method of rod-shaped purple tungsten

A violet tungsten, rod-shaped technology, applied in the field of powder metallurgy, can solve the problems of affecting the mechanical properties of alloys, coarse inclusions, poor particle size distribution uniformity, etc., and achieve the effects of uniform composition, low cost, and favorable industrial production.

Active Publication Date: 2022-07-08
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the industrially produced violet tungsten is generally acicular violet tungsten. In the process of realizing the present invention, the inventors found that the acicular violet tungsten has shortcomings in the process of preparing WC powder. Coarse, the shape and particle size of the powder in the reduction carbonization process have certain heredity, resulting in very fine powder at the tip of the needle, usually at the nanometer level, while the powder at the rear end is relatively coarse, which is ultrafine powder, resulting in poor particle size distribution uniformity, and In the subsequent preparation of the alloy, the uneven particle size distribution of the powder will easily cause coarse inclusions in the ultrafine / nano cemented carbide, which will seriously affect the mechanical properties of the alloy

Method used

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  • A kind of preparation method of rod-shaped purple tungsten
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preparation example Construction

[0030] A preparation method of rod-shaped violet tungsten in the embodiment of the present invention is specifically carried out according to the following steps:

[0031] S1, weigh tungsten powder with a particle size of 3-5 μm and hydrogen peroxide in a molar ratio of 1:1-8, wherein the hydrogen peroxide concentration is 30 wt.%.

[0032] S2, dissolving the tungsten powder in hydrogen peroxide, and after all the tungsten powder is dissolved, a tungsten solution containing peroxytungstic acid is obtained.

[0033] S3, according to the W:C molar ratio of the tungsten powder and the carbon-containing sugars as 4-24:1, weigh the carbon-containing sugars, add the weighed carbon-containing sugars, and stir evenly.

[0034] S4, after mixing evenly, put it in an oven to dry, the oven drying temperature is 80-160°C, and the drying time is 3-15h, the amorphous carbon is homogeneously compounded with peroxytungstic acid, which effectively avoids the formation of needle-shaped violet tu...

Embodiment 1

[0043] A preparation method of rod-shaped violet tungsten is specifically carried out according to the following steps:

[0044] S1, weigh tungsten powder with a particle size of 3-5 μm and hydrogen peroxide in a molar ratio of 1:1, wherein the hydrogen peroxide concentration is 15 wt.%.

[0045] S2, dissolving the tungsten powder in hydrogen peroxide, and after all the tungsten powder is dissolved, a tungsten solution containing peroxytungstic acid is obtained.

[0046] S3, weigh the starch according to the W:C molar ratio of tungsten powder and starch as 4:1, pour the weighed starch into the tungsten solution containing peroxytungstic acid, and stir evenly.

[0047] S4, after mixing evenly, put it into an oven for drying, and the oven drying temperature is 80°C and the time is 15h.

[0048] S5, after drying, the obtained powder is ground to obtain a precursor powder.

[0049] S6, heat treatment of the precursor powder under the protection of an inert atmosphere such as nit...

Embodiment 2

[0051] A preparation method of rod-shaped violet tungsten is specifically carried out according to the following steps:

[0052] S1, weigh tungsten powder with a particle size of 3-5 μm and hydrogen peroxide in a molar ratio of 1:6, wherein the concentration of hydrogen peroxide is 30 wt.%.

[0053] S2, dissolving the tungsten powder in hydrogen peroxide, and after all the tungsten powder is dissolved, a tungsten solution containing peroxytungstic acid is obtained.

[0054] S3, weigh the sucrose according to the W:C molar ratio of tungsten powder and sucrose as 15:1, pour the sucrose into the tungsten solution containing peroxytungstic acid, and stir evenly.

[0055] S4, after mixing evenly, put it into an oven for drying, and the oven drying temperature is 160° C. and the time is 3 hours.

[0056] S5, after drying, the obtained powder is ground to obtain a precursor powder.

[0057] S6, heat treatment of the precursor powder under the protection of an inert atmosphere such ...

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Abstract

The invention discloses a method for preparing rod-shaped violet tungsten, which comprises the following steps: weighing tungsten powder with a particle size of 3-5 μm and hydrogen peroxide in a molar ratio of 1:1-8; dissolving the weighed tungsten powder in hydrogen peroxide, All the tungsten powder is dissolved; the glucose is weighed according to the W:C molar ratio of the tungsten powder and the glucose as 4-24:1, the weighed glucose is added, and stirred evenly; Grinding to obtain a precursor powder; heat treatment of the precursor powder under the protection of an inert atmosphere, that is, it is obtained. The invention uses tungsten powder, hydrogen peroxide and glucose as raw materials, and obtains rod-shaped purple tungsten through the steps of dissolution, precipitation, crystallization transformation, etc. The preparation method is simple, the cost is low, the reaction is thorough, the product phase is single, the purity is high, and it is suitable for industrial production. , which solves the problems existing in the prior art.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a preparation method of rod-shaped purple tungsten. Background technique [0002] Cemented carbide is an important tool and structural material, which has a wide range of applications in various fields, and its hardness and strength depend on the grain size (WC) of the cemented carbide. The crystallographic integrity, uniformity, surface morphology, particle size and particle size distribution of WC powder will have a great impact on the properties of the alloy, and the properties of these powders depend on the properties of tungsten powder and tungsten oxide. Therefore, the preparation of high-quality, nano-scale tungsten powder is particularly important, and the preparation of nano-tungsten powder also has very high requirements on the selection of tungsten oxide raw materials. At present, in the production of ultrafine tungsten powder, the use of two raw materials, pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02
CPCC01G41/02C01P2002/72C01P2004/61C01P2004/03C01P2004/10Y02E60/36
Inventor 羊求民唐彦渊徐国钻张龙辉陈丽勇毛莉
Owner JIANGXI UNIV OF SCI & TECH
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