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Method for preparing nano tungsten carbide powder

A technology of nano-tungsten carbide and powder, which is applied in the field of powder metallurgy, can solve problems such as the lack of mass production of nano-tungsten carbide powder, the difficulty of mass-stable production of nano-powder, and the large investment in production line transformation, so as to achieve easy control, low product cost, The effect of less investment

Inactive Publication Date: 2016-01-27
王晓伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that undecomposed polymer or free carbon can still be found in the final product, which can affect product performance
[0029] Some of the existing nano-tungsten carbide powder manufacturing methods are quite different from the traditional process, and the investment in production line transformation is large; some are difficult to produce nano-powder in batches stably
In general, there is still no simple and effective method for mass production of nano-tungsten carbide powder, so that nano-tungsten carbide can be produced using traditional cemented carbide production lines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]A preparation method of nanometer tungsten carbide powder is characterized in that comprising the following steps: dissolving chromium nitrate nonahydrate and ammonium metavanadate with deionized water, adding ammonium paratungstate (APT) and ball milling for 3.5 hours to form a slurry, adding nonahydrate to every kilogram of APT 10 grams of chromium nitrate and 8 grams of ammonium metavanadate, then add water-soluble phenolic resin (PF) and continue ball milling for 9 hours, add 50 grams of phenolic resin per kilogram of APT, then spray dry to obtain composite powder; Use liquid nitrogen as the ball milling medium for ball milling for 40 hours. After drying at room temperature, put it in a carbon tube furnace and protect it with hydrogen for carbonization. During the heating process, the temperature is raised to 720°C for 1 hour, and then the temperature is raised to 1060°C at 10°C / min. ℃ for 3 hours to obtain nanometer tungsten carbide powder.

Embodiment 2

[0038] A preparation method of nanometer tungsten carbide powder is characterized in that comprising the following steps: dissolving chromium nitrate nonahydrate and ammonium metavanadate with deionized water, adding ammonium paratungstate (APT) and ball milling for 4 hours to form a slurry, adding nonahydrate to every kilogram of APT 8 grams of chromium nitrate and 10 grams of ammonium metavanadate, then add water-soluble phenolic resin (PF) and continue ball milling for 7 hours, adding 52 grams of phenolic resin per kilogram of APT, then spray drying to obtain composite powder; Use liquid nitrogen as the ball milling medium for ball milling for 38 hours. After drying at room temperature, put it in a carbon tube furnace and protect it with hydrogen for carbonization. During the heating process, the temperature is raised to 680°C for 2 hours, and then the temperature is raised to 1090°C at 5°C / min. °C for 2 hours to obtain nanometer tungsten carbide powder.

[0039] The advant...

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Abstract

The invention relates to the technology for preparing nano tungsten carbide powder and belongs to the technical field of powder metallurgy. Chromic nitrate nonahydrate and ammonium metavanadate are dissolved through deionized water, ammonium paratungstate (APT) is added, ball milling is carried out for 3.5-4 hours, pulp is formed, 8-10 g of chromic nitrate nonahydrate and 8-10 g of ammonium metavanadate are added into each kilogram of APT, then water-soluble phenol-formaldehyde resin (PE) is added, ball milling continues for 7-9 hours, 50-52 g of phenol-formaldehyde resin is added into each kilogram of APT, and then compound powder is obtained through mist spraying and drying; precursor powder is subjected to ball milling for 38-40 hours with liquid nitrogen as a ball milling medium in low-temperature ball milling and placed in a carbon tube furnace after being dried at room temperature, carbonization is performed under protection of hydrogen, the temperature is raised to 680-720 DEG C in the temperature raising process at the speed of 3-5 DEG C / min and kept for 1-2 hours, the temperature is raised to 1060-1090 DEG C at the speed of 5-10 DEG C / min and kept for 2-3 hours, and the nano tungsten carbide powder is obtained. The WC powder preparation process is simple and easy to control, industrial production investment is little, the production process is simple and convenient, product cost is low, and industrial large-scale production is convenient to achieve.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of nanometer tungsten carbide powder. Background technique [0002] Tungsten For WC-Co cemented carbide, refining WC grains is an effective way to improve the hardness and strength of cemented carbide, especially nano-WC-Co cemented carbide has superior performance and is widely used. One of the key technologies for producing nano-hard alloys is to prepare [0003] Nano WC powder or WC-Co composite powder. There are many ways to prepare it, and the more in-depth research methods are as follows: [0004] (1) Spray conversion process [0005] The basic process is to use water-soluble precursors to thermochemically synthesize nano-WC-Co, and the steps are as follows: [0006] 1) Prepare and mix the aqueous solution of the precursor compound, and fix the composition of the starting solution, usually using ammonium metatungstate [0007]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34B82Y30/00C01B32/949
Inventor 王晓伟
Owner 王晓伟