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Gasifying synthetic tungsten carbide nanometer microcrystalline and preparing process thereof

A tungsten carbide nano, gas phase synthesis technology, applied in the direction of carbides, tungsten/molybdenum carbides, etc., can solve the problems of high impurity content, not reaching the nanometer level, affecting product quality, etc.

Inactive Publication Date: 2006-08-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tungsten carbide powder produced by the above methods has uneven particle size and high impurity content, even not reaching the nanometer level, which affects the quality of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0012] In the reactor negative pressure 60cm water column, plasma power 6kw, WCl 6 The vaporization temperature is 300°C, the pressure is 0.5MPa, the flow rate of acetylene is 10l / min, the solid tungsten chloride is 50g / min, the hydrogen is 30l / min, and the argon is 30l / min. 6 , C 2 h 2 , H 2 Pass it into the reactor for reaction, and obtain nano-tungsten carbide microcrystals after quenching and refinement, the carbon content is 1%, the tungsten content is 99%, the average particle size is 20nm, and the shape is spherical or nearly spherical.

Embodiment approach 2

[0014] Reactor negative pressure 95cm water column, plasma power 10kw, vaporization temperature 400°C, pressure 1.0MPa, flow rate of acetylene 15l / min, solid tungsten chloride 85g / min, hydrogen 400l / min, argon 40l / min. The obtained nanometer tungsten carbide microcrystal has a carbon content of 10%, a tungsten content of 90%, an average particle diameter of 50nm, and a spherical or nearly spherical shape.

Embodiment approach 3

[0016] Reactor negative pressure 120cm-water column, plasma power 15kw, vaporization temperature 500°C, pressure 1.5MPa, flow rate of acetylene 20l / min, solid tungsten chloride 110g / min, hydrogen 1500l / min, argon 50l / min. The obtained nanometer tungsten carbide microcrystal has a carbon content of 20%, a tungsten content of 80%, an average particle diameter of 80nm, and a spherical or nearly spherical shape.

[0017] The purity of tungsten carbide produced according to the above process can be greater than 96%, the free silicon content is less than 1.3%, the total oxygen content is less than 1.5%, the average particle size is 20-80nm, and the specific surface area is greater than 20m 2 / g, the carbon content is 1% to 20%, the tungsten content is 99% to 80%, and the shape is spherical or nearly spherical. The overall cost has obvious commercial value, and the equipment investment is small, the process is simple, the operation is convenient, the energy consumption is low, and th...

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Abstract

A process for gas-phase synthesis of tungsten carbide nanocrystals includes such steps as proportionally adding solid tungsten chloride and carbon-contained gas source into a sealed reactor containing plasma generator, gas-phase synthesizing, sudden cooling by airflow guide and free settling in reactor to become nanoparticles, and posttreating to remove chloride impurities.

Description

1. Technical field [0001] The invention relates to a gas phase synthesis method for preparing tungsten carbide nanocrystals, which belongs to a new gas phase synthesis method of inorganic carbides and belongs to the field of chemical materials. 2. Technical background [0002] The development and application of nanomaterials is a high-tech developed in the 1980s. Because nanoparticles have many excellent properties, they can transform traditional industries: such as composite materials, coatings, rubber, pigments, ceramics, cosmetics, environmental protection materials, etc., which can greatly improve product performance and increase product value. Due to the excellent performance of the product, after my country's entry into the WTO, the product quality can challenge the world, so it is of great significance. [0003] Nano tungsten carbide microcrystals are ideal base materials for hard alloys, wear-resistant materials, cutting tool materials and optical materials. In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 孙彦平展红全王俊文陈新谋
Owner TAIYUAN UNIV OF TECH
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