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Method for preparing nanometer tungsten carbide powder by acetylene carbonization

A nano and acetylene technology, applied in the direction of carbides, tungsten/molybdenum carbides, etc., can solve the problems of inability to prepare ultra-fine WC powder, violent oxidation or explosion, and dramatic increase in activity, and achieve low cost and easy access , the effect of low reaction temperature

Inactive Publication Date: 2007-01-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More than 70 years of production practice in various countries in the world have proved that it is impossible to prepare superfine WC powder with an average WC particle size of less than 0.5 μm by this process.
Moreover, the result of intensified ball milling and crushing will lead to powder fouling, a sharp increase in activity, and the danger of violent oxidation or explosion.

Method used

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  • Method for preparing nanometer tungsten carbide powder by acetylene carbonization
  • Method for preparing nanometer tungsten carbide powder by acetylene carbonization
  • Method for preparing nanometer tungsten carbide powder by acetylene carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] With an average particle size of 36nm and a specific surface area BET of 12m 2 / g of tungsten powder as raw material. Acetylene is sent into the preheating chamber at a flow rate of 100ml / min, and after preheating at 320°C, the cracked gas is sent into the gas mixing device, while H 2 It also enters the gas mixing device at a flow rate of 150ml / min, and the two are fully mixed, and then sent into a tubular reaction furnace with a diameter of Φ50mm. The amount of nano-tungsten powder loaded in a boat is 10g / boat, and it is kept at 940°C for 1 hour. Nano WC powder can be obtained.

Embodiment 2

[0020] With an average particle size of 36nm and a specific surface area BET of 12m 2 / g of tungsten powder as raw material. Acetylene is sent into the preheating chamber at a flow rate of 150ml / min. After preheating at 450°C, the cracked gas is sent into the gas mixing device, and the H 2 It also enters the gas mixing device at a flow rate of 400ml / min, and the two are fully mixed, and then sent into a tubular reaction furnace with a diameter of Φ50mm. The amount of nano-tungsten powder loaded in the boat is 22g / boat, and the reaction is carried out at 800°C for 2 hours, that is, Nano WC powder can be obtained.

Embodiment 3

[0022] With an average particle size of 36nm and a specific surface area BET of 12m 2 / g tungsten powder as raw material, acetylene is sent into the preheating chamber at a flow rate of 200ml / min, after preheating at 550°C, the cracked gas is sent into the gas mixing device, and at the same time 2 It also enters the gas mixing device at a flow rate of 650ml / min, and the two are fully mixed, and then sent into a tubular reaction furnace with a diameter of Φ50mm. The amount of nano-tungsten powder loaded in the boat is 35g / boat, and the reaction is carried out at 750°C for 3.5 hours, that is, Nano WC powder can be obtained.

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Abstract

The present invention provides vapor acetylene carbonizing process of preparing nanometer WC powder. The process adopts WO3 powder of average size 36 nm and specific surface area 12 sq m / g as main material, acetylene as carbon source and H2 as auxiliary gas, with the gas flow rate ratio between acetylene and H2 being 1 to 1.5-4. Acetylene is first preheated at 300-550 deg.c and then led to gas mixer for mixing with H2 to constitute carbonizing atmosphere. The gas mixture is led to 50 mm diameter tubular reaction furnace and reacted with nanometer WC in boat of 10-35 g each at 750-950 deg.c for 1-3.5 hr to produce nanometer level WC powder. The present invention has the advantages of low cost, low reaction temperature, low power consumption and stable WC powder production.

Description

technical field [0001] The invention belongs to the technical field of nanometer WC powder preparation, and in particular provides a method for preparing nanometer WC powder by acetylene vapor phase carbonization. Background technique [0002] Tungsten carbide (WC) is a kind of refractory metal carbide and an important component of cemented carbide. Cemented carbide is an important industrial material and is known as "the tooth of industry". Nanocrystalline WC-based cemented carbide is a branch of nanomaterials. After the discovery that nanocrystalline ceramic materials have high fracture toughness and ductility while having high hardness, nanoscale WC / Co powder As raw materials, it produces cemented carbide materials with high hardness, high wear resistance and high toughness. [0003] In the past, to prepare WC powder with a particle size of less than 1 μm, it was necessary to prepare fine-grained tungsten powder first, and then undergo a solid-state carbonization reacti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 郭志猛卢广锋隋延力罗骥张丽英
Owner UNIV OF SCI & TECH BEIJING