Method for compounding WC-based nano composite powder by precursor method

A composite powder and nanocomposite technology, applied in the direction of nanotechnology, can solve problems such as particle agglomeration and complex process routes, and achieve the effects of reducing reaction temperature, simple process, and simplified production process

Pending Publication Date: 2018-09-18
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of process route is complicated, and the particle agglomeration is obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 32.0% ammonium paratungstate, 11.7% cobalt nitrate, 56.0% glucose and water-soluble vanadium / chromium mixed salt (0.1% ammonium metavanadate and 0.2% ammonium dichromate) in deionized In water, prepare a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was microwave sintered under the protection of argon atmosphere. At different reaction temperatures (900-1200 °C) and holding times (1-2.5 h), the average particle size was less than 100 nm and the particle size distribution was uniform. WC-based composite powder.

Embodiment 2

[0027] Dissolve 35.0% ammonium metatungstate, 12.5% ​​cobalt nitrate, 52.0% sucrose and water-soluble vanadium / chromium mixed salt (0.2% ammonium metavanadate and 0.3% ammonium dichromate) Ionized water to prepare a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was microwave sintered under vacuum conditions, and under different reaction temperatures (900-1200 °C) and holding times (1-2.5 h), WC-based composites with an average particle size of less than 100 nm and a uniform particle size distribution were prepared. Compound powder.

Embodiment 3

[0029] Dissolve 45.0% ammonium paratungstate by mass, 10.0% cobalt nitrate, 44.6% starch and water-soluble vanadium / chromium mixed salt (0.2% ammonium metavanadate and 0.2% ammonium dichromate) in deionized water, Prepared as a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was placed in a tube furnace and sintered under the protection of an argon atmosphere. The average particle size was obtained at different reaction temperatures (900~1200°C) and holding times (1~2.5h). Less than 200nm, WC-based composite powder with uniform particle size distribution.

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Abstract

A method for compounding WC-based nano composite powder by a precursor method is characterized by comprising the following steps that firstly, water-soluble tungstate with a mass percent of 32.0%-45.0%, water-soluble cobalt salt with a mass percent of 10.0%-15.0%, water-soluble vanadium / chrome salt mixtures with a mass percent of 0.3%-0.5% and water-soluble organic carbon with a mass percent of40.0%-56.0% are dissolved in deionized water; secondly, solutions in the first step are evenly stirred with a glass rod and then heated and dried to obtain precursor composite powder containing a tungsten source, a cobalt source, a chrome source, a vanadium source and a carbon source; and thirdly, the precursor composite powder obtained in the second step is put in a high temperature reacting furnace, sintering is carried out under the condition of vacuum or argon atmosphere protection, and finally the WC-based composite powder with a nanometer size is prepared. According to the method, the preparation cost can be greatly reduced, the preparation cycle is shortened, and the method has the characteristics of being simple in process, even in product and the like and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for synthesizing WC-based nano-composite powder by a precursor method, and belongs to the technical field of nano-metal-ceramic composite powder preparation. Background technique [0002] WC-Co composite powder and its alloys are extremely important functional materials and tools for modern industry, national defense and new technology applications, and are widely used in aerospace, marine, automotive, electrical, electronics, chemical and other fields. Experiments show that the finer the grain size of the cemented carbide, the better the comprehensive performance. When the grain size is less than 0.5μm, the hardness and strength are greatly improved. It can be seen that the nano-WC-Co composite powder is the key to the preparation of high-performance ultra-fine cemented carbide. . In addition, the surface spraying hard surface material also puts forward higher standards for spraying composite powder, not only requiri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B82Y40/00
CPCB22F9/20B82Y40/00
Inventor 赵志伟郑娟陈利霞王顺赵小苗毛淑芳郑红娟
Owner HENAN UNIVERSITY OF TECHNOLOGY
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