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Preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder

A high specific surface, nano technology, applied in the field of WC powder

Active Publication Date: 2021-04-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, to obtain WC powder with a small particle size, the key is to refine the violet tungsten beam so that it breaks into WC particles of tens of nanometers during the carbonization process. However, there is currently no effective method to suppress the coarsening behavior of the violet tungsten beam diameter.

Method used

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  • Preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder
  • Preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder
  • Preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, blue tungsten powder is used as raw material to prepare nano-W powder, and the process steps are as follows:

[0033] (1) Spread the blue tungsten powder on the boat, adjust the loading amount to 150g / boat, and control the thickness of the blue tungsten powder layer to 3mm;

[0034] (2) The heating zones of the five-zone hydrogen reduction furnace are divided into low-temperature zones, medium-temperature zones and high-temperature zones, wherein the first, second and third heating zones are low-temperature zones, and the length is 60% of the total length of the heating zones. The fourth heating zone is a medium temperature zone, and the length is 20% of the total length of the heating zone. The fifth heating zone is a high temperature zone, and the length is 20% of the total length of the heating zone. At 850°C, the temperature of the high temperature zone is set at 950°C;

[0035] (3) Using inverse hydrogen reduction, the determination of the hydroge...

Embodiment 2

[0039] In this example, the high specific surface nano W powder and carbon black prepared in Example 1 are used as raw materials to prepare nano WC powder, and the process steps are as follows:

[0040] (1) Purge the mixing chamber of the roller ball mill with argon gas of 600ml / min to discharge the air in the mixing chamber to prevent spontaneous combustion during mixing;

[0041](2) by WC chemical formula, the mass ratio of C and W is 12:184, and the percentage of ratio is 6.52%, and promptly the mass fraction of required carbon amount is 6.52%; Due to the prepared high specific surface nanometer W powder of embodiment 1 The oxygen content is 1.2%, so the mass fraction of W is 98.8%, and the corresponding mass fraction of C is 6.52%×98.8%=6.44%. The amount of deoxygenated carbon is calculated by completely generating CO from the oxygen in the raw material W powder, that is, 1g Oxygen needs 0.75g of carbon, so the mass fraction of oxygen-removing carbon is 1.2%×75%=0.9%, and ...

Embodiment 3

[0047] In this example, nano-WC powder was prepared from the high-specific-surface nano-W powder and anhydrous glucose prepared in Example 1. The process steps are as follows:

[0048] (1) Purge the mixing chamber of the roller ball mill with argon gas of 600ml / min to discharge the air in the mixing chamber to prevent spontaneous combustion during mixing;

[0049] (2) by WC chemical formula, the mass ratio of C and W is 12:184, and the percentage of ratio is 6.52%, and promptly the mass fraction of required carbon amount is 6.52%; Due to the prepared high specific surface nanometer W powder of embodiment 1 The oxygen content is 1.2%, so the mass fraction of W is 98.8%, and the corresponding mass fraction of C is 6.52%×98.8%=6.44%. The amount of deoxygenated carbon is calculated by completely generating CO from the oxygen in the raw material W powder, that is, 1g Oxygen needs 0.75g of carbon, so the mass fraction of oxygen-removing carbon is 1.2%×75%=0.9%, and the mass fraction...

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Abstract

The invention provides preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder. The preparation method of the high-specific-surface-area nano W powder comprises the steps that blue tungsten powder serves as a raw material, reverse hydrogen reduction is adopted, a heating zone of a hydrogen reduction furnace is divided into a low-temperature zone, a medium-temperature zone and a high-temperature zone, the temperature of the low-temperature zone is set to be 500-800 DEG C, the temperature of the medium-temperature zone is set to be 600-900 DEG C, the temperature of the high-temperature zone is set to be 700-1000 DEG C, and reaction time is 5-9 h. According to the preparation method of the high-specific-surface-area nano WC powder, the high-specific-surface-area nano W powder prepared through the method and a carbon source serve as raw materials, the reaction temperature is set to range from 900 DEG C to 1300 DEG C, and the reaction time ranges from 2 h to 6 h. The BET value of the nano W powder obtained through the method reaches 25.55 m<2> / g, and the BET value of the nano WC powder obtained through the method is larger than 4.0 m<2> / g.

Description

technical field [0001] The invention belongs to the technical field of WC powder, and relates to a preparation method of nano WC powder as a cemented carbide raw material. Background technique [0002] Cemented carbide is a composite material prepared with WC powder as the main raw material. Because of its high hardness, high wear resistance, high strength, and good toughness, it is widely used in cutting tools, drilling, exploration and other projects. . To prepare high-quality cemented carbide, nano WC powder with high specific surface area is needed. The preparation of nano-WC powder with high specific surface is a difficult problem in industrial production, and it is also the focus of industry research. It is of great significance to improve the production technology level of my country's cemented carbide industry and develop high-quality and high value-added deep-processed cemented carbide products. . [0003] Regarding the preparation of WC powder, the commonly used ...

Claims

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Application Information

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IPC IPC(8): B22F9/22C01B32/949B82Y40/00
CPCB22F9/22C01B32/949B82Y40/00C01P2004/03C01P2002/72C01P2006/12
Inventor 叶金文刘颖孔一凡
Owner SICHUAN UNIV
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