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Narrow-granularity thermally-stable tungsten carbide powder and preparation method thereof

A tungsten carbide, thermally stable technology, applied in the field of metal powder, can solve the problems of wear, limited application of tungsten carbide, large friction coefficient of friction system, etc.

Inactive Publication Date: 2022-07-22
滁州用朴新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual working environment, tungsten carbide needs to be used in some extreme environments, such as humid environment and acid environment. In these environments, the existing tungsten carbide generally cannot meet the requirements, and due to the high hardness of tungsten carbide, the friction system The large friction coefficient will cause serious wear, which limits the application of tungsten carbide in harsh environments. Therefore, how to prepare a narrow particle size distribution, self-lubricating, and corrosion-resistant tungsten carbide is particularly important.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:

[0032] (1) The graphite was sent into a plasma chamber with a frequency of 0.5 MHz and a power of 500 W, and the hydrogen was fed at 10 sccm to a pressure of 2 kPa, then heated to 300 ° C at 20 ° C / min, kept for 35 min, and then at the same speed. Introduce oxygen to a pressure of 4kPa, heat up to 600°C at 25°C / min, keep the temperature for 25min, repeat the above operation 3 times to obtain a graphene oxide composite;

[0033] (2) after peeling off the graphene oxide composite 5 times with scotch tape, place in the ultrasonic processor with a frequency of 30kHz, abrasive 25min, then place in jet mill equipment, abrasive 20min at 10000rpm, obtain graphene nano-sheet;

[0034] (3) Heating ammonium paratungstate at 280°C for 3 hours, adding deionized ...

Embodiment 2

[0039] A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:

[0040] (1) The graphite is sent into a plasma chamber with a frequency of 0.5 MHz and a power of 900 W, and hydrogen is fed at 40 sccm to a pressure of 5 kPa, then the temperature is raised to 500 ° C at 40 ° C / min, and the temperature is maintained for 15 minutes. Pour oxygen to a pressure of 7kPa, heat up to 800°C at 55°C / min, keep the temperature for 10min, and repeat the above operation once to obtain a graphene oxide composite;

[0041] (2) after peeling off the graphene oxide composite 10 times with scotch tape, place it in the ultrasonic processor with a frequency of 45kHz, abrasive 15min, then place in jet mill equipment, abrasive 10min at 14000rpm, obtain graphene nano-sheet;

[0042] (3) Heating ammonium paratungstate at 360°C for 1 hour,...

Embodiment 3

[0047] A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:

[0048] (1) Put the graphite into a plasma chamber with a frequency of 0.5MHz and a power of 700W, feed hydrogen gas at 25sccm to a pressure of 4kPa, heat it up to 400°C at 30°C / min, keep the temperature for 25min, and then at the same speed Introduce oxygen to a pressure of 6kPa, heat up to 700°C at 40°C / min, keep the temperature for 17min, and repeat the above operation twice to obtain a graphene oxide composite;

[0049] (2) after peeling off the graphene oxide composite 7 times with scotch tape, place in the ultrasonic processor with a frequency of 38kHz, abrasive 20min, then place in the jet mill equipment, abrasive 15min under 12000rpm, obtains graphene nano-sheet;

[0050] (3) Heating ammonium paratungstate at 320°C for 2 hours, adding deioni...

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PUM

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Abstract

The invention discloses narrow-granularity thermally-stable tungsten carbide powder and a preparation method thereof, and relates to the technical field of metal powder. The preparation method comprises the following steps: firstly, alternately etching graphite by using hydrogen and oxygen plasmas, and then stripping by using an adhesive tape and ultrasonic airflow to obtain a narrow-granularity graphene nanosheet; the preparation method comprises the following steps: solidifying an ammonium tungstate solution at an ultralow temperature to wrap all graphene nanosheets, and then growing tungsten carbide nanosheets on the surfaces of the graphene nanosheets through an alternating microwave magnetic field to obtain graphene-tungsten carbide-graphene sandwich type nanosheet powder, so that the surface roughness of the tungsten carbide powder is reduced, and the self-lubricating effect of the tungsten carbide powder is realized; the preparation method comprises the following steps: firstly preparing a graphene nanosheet, then modifying the graphene nanosheet by using dimethyl succinic anhydride, 2-chlorobenzoin aldehyde, 2, 5-dimercapto-1, 3, 4-thiadiazole and hydrazine hydrate to form a thicker and compact protective film and an isolating layer, and effectively blocking corrosion elements. The prepared tungsten carbide powder has the effects of narrow particle size distribution, self-lubrication and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal powders, in particular to a narrow particle size thermally stable tungsten carbide powder and a preparation method thereof. Background technique [0002] Tungsten carbide has the advantages of high melting point, high hardness, high strength, high thermal stability and low expansion coefficient, and is widely used in various engineering applications, such as the manufacture of cemented carbide, rock drill bits and thermal spray coatings. In particular, ultra-fine grained cemented carbide has more excellent mechanical properties, and its mechanical properties are determined by the size of tungsten carbide particles in the alloy. When the grain size of tungsten carbide is ultra-fine / nano-scale, it will have higher High hardness and toughness can effectively overcome the contradiction between hardness and toughness in traditional cemented carbide. [0003] In the actual working environment, tungsten c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/949C01B32/194C01B32/192
CPCC01B32/949C01B32/194C01B32/192
Inventor 李友军项忠楠徐金海叶鑫
Owner 滁州用朴新材料科技有限公司
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