High-red-hardness tungsten carbide pure-phase block material and preparation method thereof

A bulk material, tungsten carbide technology, applied in the field of high red hardness tungsten carbide pure phase bulk material and its preparation, can solve the problems of reducing the red hardness of cemented carbide, difficult to densify, unable to refine grains, etc. The effect of improving high temperature mechanical properties, inhibiting grain growth, and excellent high red hardness

Active Publication Date: 2021-08-20
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the metal binder phase in cemented carbide will soften at high temperature, thereby reducing the red hardness of cemented carbide and limiting the high temperature wear resistance and life of cemented carbide
Without the use of a metal binder phase, the existing solutions will face technical difficulties such as difficulty in densification after sintering and inability to refine grains, thus failing to meet the requirements of hard materials

Method used

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  • High-red-hardness tungsten carbide pure-phase block material and preparation method thereof
  • High-red-hardness tungsten carbide pure-phase block material and preparation method thereof
  • High-red-hardness tungsten carbide pure-phase block material and preparation method thereof

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preparation example Construction

[0023] Specifically, the present invention provides a method for preparing a high red hardness tungsten carbide pure-phase bulk material, which comprises the following steps:

[0024] (1) pre-pressing the nanometer tungsten carbide powder into a billet to obtain a pre-pressed billet;

[0025] (2) packaging and isolating the pre-pressed green body with a packaging material to obtain a precursor;

[0026] (3) vacuum purifying the precursor;

[0027] (4) Synthesizing a high red hardness tungsten carbide pure-phase bulk material at a temperature of at least 1000° C. and a pressure of at least 1.5 GPa.

[0028] In step (1), it is preferable to use ultra-fine particle diameter and high-purity nano-tungsten carbide. In the method of this paper, tungsten carbide powder with higher purity and finer particle size is used as raw material, which is conducive to the final synthesis of high red hardness tungsten carbide pure phase bulk material with smaller average grain size and higher p...

Embodiment 1

[0073] 1) Calculate and weigh the nano-tungsten carbide powder with an average particle size of 40nm and a purity of ≥99.7%, put it into a shaping mold and pre-press it under a pressure of 25MPa to form a billet, and then use vanadium foil for packaging and isolation treatment to obtain a semi-dense clean surface precursor , the thickness of the foil is 0.03mm, and the density of the pre-pressed green body is 47%;

[0074] 2) Put the obtained precursor into the conductive thermal insulation and pressure transmission composite device, and place it in a high-temperature tube furnace for high-vacuum purification treatment. The treatment temperature is 900°C, the time is 30min, and the vacuum degree is -3 Pa, and finally completed the high-pressure synthesis in a six-way high-temperature and high-pressure equipment. The synthesis temperature is 1100°C, the pressure is 3GPa, the temperature rise / fall rate is 150°C / min, and the heat preservation and pressure holding time is 15min. Fin...

Embodiment 2

[0076] 1) Calculate and weigh nano-tungsten carbide powder with an average particle size of 240nm and a purity of ≥99.7%, put it into a shaping mold and pre-press it under a pressure of 15MPa to form a billet, and then use niobium foil for packaging and isolation treatment to obtain a semi-dense clean surface precursor , the thickness of the foil is 0.03mm, and the density of the pre-pressed green body is 55%;

[0077] 2) Put the obtained precursor into a conductive thermal insulation and pressure transmission compound device, and place it in a high-temperature tube furnace for high-vacuum purification treatment. The treatment temperature is 600°C, the time is 40min, and the vacuum degree is -3 Pa, and finally high-pressure synthesis was completed in a six-way high-temperature and high-pressure equipment. The synthesis temperature was 1200°C, the pressure was 4GPa, the temperature rising / falling rate was 260°C / min, and the heat preservation and pressure holding time was 20 minutes...

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Abstract

The invention relates to a high-red-hardness tungsten carbide pure-phase block material and a preparation method thereof. The preparation method of the high-red-hardness tungsten carbide pure-phase block material comprises the following steps: (1) pre-pressing nano tungsten carbide powder into a blank to obtain a pre-pressed green body; (2) packaging and isolating the pre-pressed green body by using a packaging material to obtain a precursor; (3) performing vacuum purification on the precursor; and (4) synthesizing the high-red-hardness tungsten carbide pure-phase block material at the temperature of at least 1000 DEG C and the pressure of at least 1.5 GPa. The high-red-hardness tungsten carbide pure-phase block material disclosed by the invention has ultra-fine grains, relatively high compactness and excellent high red hardness.

Description

technical field [0001] The invention relates to the technical field of tungsten carbide pure phase block, in particular to a high red hardness tungsten carbide pure phase block material and a preparation method thereof. Background technique [0002] Tungsten carbide is a compound composed of tungsten and carbon. It has the characteristics of high melting point, high wear resistance, good chemical stability and thermal stability. It is mainly used for the production of hard materials, especially hard alloy materials. matrix phase. [0003] Among the main hard materials at present, tungsten carbide usually needs to be compounded with metal binders such as cobalt and nickel to prepare hard alloys. Cemented carbide is mostly used in cutting tools and wear-resistant parts, such as superhard tool materials and wear-resistant materials, known as "industrial teeth". However, the metal binder phase in the cemented carbide will become soft at high temperature, thereby reducing the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
CPCC04B35/5626C04B35/622C04B35/645C04B2235/6581C04B2235/785C04B2235/96C04B2235/6562C04B2235/6567C04B2235/77
Inventor 赵智胜董洪峰陈俊云马梦冬李宝忠张洋罗坤武英举胡文涛何巨龙于栋利徐波柳忠元田永君
Owner YANSHAN UNIV
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