Microwave induction catalytic preparation method of nano tungsten carbide

A technology of nano-tungsten carbide and induced catalysis, which is applied in the field of nano-materials and can solve the problems of low specific surface area and purity

Inactive Publication Date: 2008-05-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resulting products have very low specific surface area and purity, th

Method used

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  • Microwave induction catalytic preparation method of nano tungsten carbide

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Embodiment 1

[0018] Dissolve 1.0 g of W in 100 ml of hydrogen peroxide, then add 1 g of activated carbon powder and 100 ml of ethanol, put it into an ultrasonic cleaner for 30 minutes to disperse evenly, take it out and stir until it becomes a viscous slurry. Then the viscous slurry is put into a microwave oven, and the slurry is heated in a manner of alternately operating the microwave for 5 seconds and stopping for 5 seconds to obtain a dry powder. Next, mechanically mix the dry powder with 1 gram of iron powder, put it into a ceramic crucible, and wrap microwave-resistant insulation material around the ceramic crucible. Finally, put the crucible into a microwave oven and continue heating for 20 minutes to obtain nanoscale tungsten carbide particles.

Embodiment 2

[0020] Dissolve ammonium metatungstate containing 1.0g of tungsten in a 300ml beaker filled with 40ml of deionized water, add 30ml of isopropanol, add 1g of carbon nanotubes, and put them into an ultrasonic cleaning machine for ultrasonic dispersion. , take out and stir until viscous slurry. Then put the viscous slurry into a microwave oven with a frequency of 2.54 GHz, and heat the slurry in a manner of alternating microwave operation for 10 seconds and stopping for 20 seconds to obtain a dry powder. Next, mechanically mix the dry powder with 0.5 g of cobalt powder, put it into a ceramic crucible, and wrap a microwave-resistant thermal insulation material with a thickness of 5 cm around the ceramic crucible. Finally, put the crucible into a microwave oven and heat it for 2 minutes to obtain nanoscale tungsten carbide particles.

Embodiment 3

[0022] WO with a tungsten content of 1.0g 3 Dissolve in a 300ml beaker with 40ml of deionized water, add 50ml of acetone, add 3g of carbon microsphere powder, put it into an ultrasonic cleaner for ultrasonic dispersion, take it out and stir until it becomes a viscous slurry. Then the viscous slurry is put into a microwave oven, and the slurry is heated in a manner of alternately operating the microwave for 5 seconds and stopping for 5 seconds to obtain a dry powder. Next, mechanically mix the dry powder with 0.1 g of nickel powder, put it into a crucible, and wrap the microwave-resistant thermal insulation material around the crucible. Finally, put the crucible into a microwave oven and continue heating for 15 minutes to obtain nanoscale tungsten carbide particles.

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Abstract

The invention discloses a microwave-induced catalytic preparation method of nano-sized tungsten carbide. Preparation steps of the invention are that: (1) a certain mass of tungstenic material is dissolved in a microwave resistant absorption vessel which contains solvent, and dispersant and carbon source are added into the vessel in sequence; the mixture is put into an ultrasonic clearing machineto disperse homogeneously with ultrasonic, and then the mixture is taken out to be stirred till the mixture becomes viscous slurry; (2) the viscous slurry is put into a microwave oven, and drying powder can be obtained by a intermittent microwave heating method, namely, the slurry is heated intermittently; (3) a certain proportion of metallic powder is added into the drying powder, and the obtained mixture is put into a crucible after mixing homogeneous mechanically; after surroundings of the crucible are coated with microwave resistant heat preserving materials, the crucible is put into the microwave oven to be heated constantly, and nano tungsten carbide particles are obtained. The invention adopts the microwave-induced catalytic method, thus the tungsten carbide can be heated to high temperature quickly; the invention is characterized by fast preparation speed and low energy consumption, and purity quotient of the prepared nano tungsten carbide particles is high.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a microwave-induced catalytic preparation method of nanometer tungsten carbide. Background technique [0002] Tungsten carbide is a material with unique physical and chemical properties. The properties of this material combine the properties of ionic crystals, covalent compounds and transition metals. They have the high strength, hardness and brittleness of covalent compounds, the high melting point and simple crystal structure of ionic crystals, and their electrical and magnetic properties are similar to those of transition metals. The melting point of tungsten carbide is 2600-2850°C, the hardness is 16-22GPa, the tensile strength is 300GPa, the compressive strength is 5GPa, at 20°C, the breaking strength is 28MPam 1 / 2 . These properties are similar to those of ceramic materials, and their electrical conductivity, magnetic susceptibility and heat capacity are similar to met...

Claims

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Application Information

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IPC IPC(8): B01J27/22C01B31/34C01B32/949
Inventor 沈培康赵祖珍
Owner SUN YAT SEN UNIV
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