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A method for preparing nanostructured tungsten carbide composite bulk material by using high temperature and ultra-high pressure

A technology of nano-tungsten carbide and nano-structure, which is applied in the field of cermet materials, and achieves the effect of simple and easy preparation method

Inactive Publication Date: 2017-05-31
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of nanostructured WC composite bulk materials under the extreme conditions of high temperature and ultra-high pressure.

Method used

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  • A method for preparing nanostructured tungsten carbide composite bulk material by using high temperature and ultra-high pressure
  • A method for preparing nanostructured tungsten carbide composite bulk material by using high temperature and ultra-high pressure

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Embodiment 1

[0023] The mixed powder of tungsten carbide with an average particle size of 30 nm and metal cobalt with an average particle size of 0-2μm is selected, and the mass fraction of tungsten carbide is 85%. figure 1 The process flow chart shown prepares a high-performance nanostructured tungsten carbide composite bulk material.

[0024] The mixed powder of tungsten carbide and cobalt is first subjected to continuous washing, powder-liquid separation washing, heating and drying to remove impurities. Then, the fine powder of the raw material after the removal of impurities is put into the pre-designed mold, and the mold is put into the processing cavity of the vacuum hot pressing furnace. Ensure that the vacuum degree is better than 4 x 10 during processing -3 Pa, temperature is 500-700℃, treatment time is 1-3 hours. The raw materials are pre-compressed with a pressure of about 30 MPa, and the raw materials are immediately sealed after the vacuum high-temperature pre-compression.

[0025...

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Abstract

The invention relates to a method for preparing the nanostructure tungsten carbide composite bulk by high temperature and ultra high pressure. Under the condition of high temperature and ultra high pressure, nanometer tungsten carbide or the mixed powder of the nanometer tungsten carbide and cobalt is used as the raw material, and the cobalt accounts for 0-30wt% of the raw material. After mechanical mixing and high-temperature decontamination, a sintering unit is assembled, and the high-performance nanostructure tungsten carbide composite bulk is directly prepared by high temperature and ultra high pressure sintering. The nanostructure tungsten carbide composite bulk has even phase distribution, and the tungsten carbide grain is in the nanoscale. The hardness and the fracture toughness of the high-performance nanostructure tungsten carbide composite bulk prepared with the method disclosed by the invention are higher than those of the traditional product by 50%, and the density of the high-performance nanostructure tungsten carbide composite bulk approaches to the ideal density.

Description

[0001] The invention relates to a method for preparing a nano-structured tungsten carbide composite block material under high temperature and ultra-high pressure conditions using nano tungsten carbide or nano tungsten carbide and cobalt mixed powder as raw materials, and belongs to the field of cermet materials. [0002] technical background [0003] Tungsten carbide (WC) is a structural cermet material with high melting point, high wear resistance, high hardness, good chemical stability and thermal stability. WC is usually mixed and sintered with metallic cobalt to form a WC-cobalt composite bulk material, commonly known as cemented carbide. Cemented carbide is currently the most used tool material and is known as the "industrial tooth". However, the particle size of tungsten carbide in conventional cemented carbide is micron or sub-micron, and high-performance ultra-fine and nano-scale cemented carbide is very difficult to prepare. The fundamental problem is that the key preparat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 王海阔赵志伟彭进邹文俊王惠芬
Owner HENAN UNIVERSITY OF TECHNOLOGY
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