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Nanometer tungsten carbide powder preparing method

A nano-tungsten carbide and powder technology, applied in the field of powder metallurgy, can solve the problems of not mass-producing nano-tungsten carbide powder, difficult to produce nano-powder stably in batches, large investment in production line transformation, etc., achieving easy control, low product cost, The effect of less investment

Inactive Publication Date: 2014-03-26
UNIV OF SCI & TECH BEIJING
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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
[0028] 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

[0042] Dissolve chromium nitrate nonahydrate and ammonium metavanadate with deionized water, add ammonium paratungstate (APT) and ball mill for 2-3 hours to form a slurry, add 7.7 grams of chromium nitrate nonahydrate and 6.4 grams of ammonium metavanadate per kilogram of APT, and then add water to dissolve The permanent phenolic resin (PF) was ball-milled for 6 hours, and 52 grams of phenolic resin was added per kilogram of APT, and then spray-dried to obtain a composite powder; the precursor powder was ball-milled for 12 hours in a low-temperature ball mill with liquid nitrogen as a ball-milling medium, dried at room temperature, and placed Protect the carbonization with hydrogen in a carbon tube furnace. During the heating process, raise the temperature at 3°C / min to 680°C and keep it for 2 hours, then raise the temperature at 5°C / min to 1060°C and keep it for 3 hours to obtain nano-tungsten carbide powder.

Embodiment 2

[0044] Dissolve chromium nitrate nonahydrate and ammonium metavanadate with deionized water, add ammonium paratungstate (APT) and ball mill for 2-3 hours to form a slurry, add 7.7 grams of chromium nitrate nonahydrate and 6.4 grams of ammonium metavanadate per kilogram of APT, and then add water to dissolve The permanent phenolic resin (PF) was ball-milled for 4 hours, and 55 grams of phenolic resin was added per kilogram of APT, and then spray-dried to obtain a composite powder; the precursor powder was ball-milled for 36 hours in a low-temperature ball mill with liquid nitrogen as a ball-milling medium, dried at room temperature, and placed Protect the carbonization with hydrogen in a carbon tube furnace. During the heating process, raise the temperature to 720°C at 5°C / min for 1 hour, then raise the temperature at 10°C / min to 1090°C for 2 hours to obtain nano-tungsten carbide powder.

Embodiment 3

[0046] Dissolve chromium nitrate nonahydrate and ammonium metavanadate with deionized water, add ammonium paratungstate (APT) and ball mill for 2-3 hours to form a slurry, add 7.7 grams of chromium nitrate nonahydrate and 6.4 grams of ammonium metavanadate per kilogram of APT, and then add water to dissolve The permanent phenolic resin (PF) was ball-milled for 5 hours, and 54 grams of phenolic resin was added per kilogram of APT, and then spray-dried to obtain a composite powder; the precursor powder was ball-milled for 24 hours with liquid nitrogen as a ball-milling medium in a low-temperature ball mill, dried at room temperature, and placed Protect the carbonization with hydrogen in a carbon tube furnace. During the heating process, the temperature was raised to 700°C at 4°C / min and kept for 1.5 hours, and then the temperature was raised to 1080°C at 8°C / min for 2.8 hours to obtain nano-tungsten carbide powder.

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Abstract

The invention relates to a nanometer tungsten carbide powder preparing method. The method includes the following steps that chromic nitrate and ammonium metavanadate are dissolved into deionized water, APT is added, ball milling and slurry forming are carried out, water-soluble PF is then added to continue carrying out ball milling, and then spraying and drying are carried out to obtain composite powder; precursor powder is subjected to ball milling under low temperature with liquid nitrogen as the ball milling medium, and the ball milling product is dried under room temperature and is then placed into a carbon tube furnace and carbonized under hydrogen protection to obtain nanometer tungsten carbide powder. Chromium, vanadium and the PF are added at the beginning of processes, and sizes of WC powder particles can be easily and stably kept at the nanoscale through element internal inhibition in the production process, the external wrapping and isolation function of the PF and liquid nitrogen freezing and ball milling; furthermore, because the WC powder preparation process is simple and easy to control, industrialization production investment is small, production processes are simple and convenient to carry out, production cost is low, and industrial batch production is facilitated.

Description

technical field [0001] The invention relates to a technology for preparing nanometer tungsten carbide powder, belonging to the technical field of powder metallurgy. [0002] Background technique [0003] 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 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] Rutgers University in the United States, Nanodyne Corporation, and University of Science and Technology Beijing have all carried out research and development on this method. The basic process is to use water-soluble precursors to thermochemically synthesize nano-WC-Co, and the steps are as follows: [0006] 1) Prepare...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F9/16B82Y40/00
Inventor 林涛柏景雷邵慧萍张深根何新波王志
Owner UNIV OF SCI & TECH BEIJING
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