A kind of cemented carbide with high hardness and high toughness and preparation method thereof

A cemented carbide and high-toughness technology, which is applied in the field of high-hardness and high-toughness cemented carbide and its preparation, can solve the problems of insufficient temperature control and insufficient performance of cemented carbide, so as to avoid excessive grain growth, Excellent performance, fine grain effect

Active Publication Date: 2022-02-08
株洲坤锐硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the temperature control of sintering in the prior art is not fine enough, resulting in the lack of performance of the obtained cemented carbide

Method used

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  • A kind of cemented carbide with high hardness and high toughness and preparation method thereof
  • A kind of cemented carbide with high hardness and high toughness and preparation method thereof

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preparation example Construction

[0032] The preparation method of described cemented carbide is as follows:

[0033] (1) Mixing: Mix WC powder, Co powder, Ni powder, and phosphorene, add them to absolute ethanol, ultrasonicate for 10-60 minutes, then put the mixture into a vacuum drying oven, and dry it at 60-100°C until constant weight. Obtain dry mixed powder;

[0034] (2) Sintering: put the above mixed powder into a graphite mold, place it in a spark plasma sintering equipment for sintering, vacuumize to below 20Pa, and after power on, use stepwise temperature control method to raise the temperature to 1000-1600°C, pressurize 10-40MPa, keep warm for 2-5 minutes and then cool naturally to obtain the corresponding high-hardness and high-toughness cemented carbide.

[0035] The step temperature control process is to slowly raise the temperature to 600-800°C at a rate of 20-80°C / min, and then rapidly increase the temperature to 1000-1600°C at a rate of 100-200°C / min.

[0036] Preferably, vacuumize to 1-10Pa....

Embodiment 1

[0038] A high hardness and high toughness cemented carbide, the composition of the cemented carbide is as follows:

[0039] WC powder 87.5wt%, Co powder 8wt%, Ni powder 4wt%, phosphorene 0.5wt%.

[0040] Wherein, the WC powder includes WC powders of different particle sizes, which are respectively nano WC powder and submicron WC powder;

[0041] The particle size of the nanometer WC powder is 80nm;

[0042] The particle size of the submicron WC powder is 0.6 μm;

[0043] The mass ratio of the nanometer WC powder and the submicron WC powder is 3:1;

[0044] The preparation method of described cemented carbide is as follows:

[0045] (1) Mixing: Mix WC powder, Co powder, Ni powder, and phosphorene, add them to absolute ethanol, ultrasonicate for 30 minutes, then put the mixture in a vacuum drying oven, and dry at 90°C to constant weight to obtain a dry mixed Powder;

[0046] (2) Sintering: Put the above mixed powder into a graphite mold, put it in a spark plasma sintering e...

Embodiment 2

[0048] A high hardness and high toughness cemented carbide, the composition of the cemented carbide is as follows:

[0049] WC powder 89.5wt%, Co powder 5wt%, Ni powder 5wt%, phosphorene 0.5wt%.

[0050] Wherein, the WC powder includes WC powders of different particle sizes, which are respectively nano WC powder and submicron WC powder;

[0051] The particle size of the nanometer WC powder is 80nm;

[0052] The particle size of the submicron WC powder is 0.6 μm;

[0053] The mass ratio of the nanometer WC powder and the submicron WC powder is 3:1;

[0054] The preparation method of described cemented carbide is as follows:

[0055] (1) Mixing: Mix WC powder, Co powder, Ni powder, and phosphorene, add them to absolute ethanol, ultrasonicate for 30 minutes, then put the mixture in a vacuum drying oven, and dry at 90°C to constant weight to obtain a dry mixed Powder;

[0056] (2) Sintering: Put the above mixed powder into a graphite mold, put it in a spark plasma sintering e...

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Abstract

The invention relates to the technical field of cemented carbide, in particular to a high-hardness and high-toughness cemented carbide and a preparation method thereof. The cemented carbide is composed as follows: WC powder 60-95wt%, Co powder 5-10wt%, Ni powder 2 ‑5wt%, phosphorene 0.1‑1wt%; the preparation method is: mix WC powder, Co powder, Ni powder, and phosphorene, add them to absolute ethanol, and undergo ultrasonic, vacuum drying and drying to obtain dry mixed powder, and then put the mixed powder into spark plasma sintering equipment for sintering to obtain the corresponding high-hardness and high-toughness cemented carbide. The invention obtains a hard alloy with high hardness and high toughness by modifying the hard alloy, which has excellent application prospects.

Description

technical field [0001] The invention relates to the technical field of cemented carbide, in particular to a high-hardness and high-toughness cemented carbide and a preparation method thereof. Background technique [0002] Cemented carbide is a sintered material composed of a hard refractory metal carbide phase and a binder metal phase. It has the characteristics of high hardness, high strength, high elastic modulus, and good wear resistance and corrosion resistance. It is widely used in various Cutting tools, mining tools and wear-resistant and corrosion-resistant parts, etc. [0003] The improvement and improvement of cemented carbide has been researched, such as high-speed cutting performance, dry cutting performance, machining accuracy and mechanical properties of materials. Traditional cemented carbide mainly uses hard phases such as WC as the matrix, and adds binder phases such as Co and Ni and some additives to make it have high strength and high hardness to achieve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05B22F1/12B22F3/105
CPCC22C29/08C22C1/051B22F3/105B22F2003/1051
Inventor 李世富
Owner 株洲坤锐硬质合金有限公司
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