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A kind of graphene modified cemented carbide and preparation method thereof

A technology of graphene modification and cemented carbide, which is applied in the field of preparation of cemented carbide materials and graphene modified cemented carbide. Efficient and rapid preparation, avoiding cumbersome processes, and improving the effect of sintering stability

Active Publication Date: 2021-02-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the cumbersome process and high cost of preparing high-quality graphene, especially graphene oxide, it is difficult to meet the needs of large-scale applications

Method used

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  • A kind of graphene modified cemented carbide and preparation method thereof
  • A kind of graphene modified cemented carbide and preparation method thereof
  • A kind of graphene modified cemented carbide and preparation method thereof

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preparation example Construction

[0019] see figure 1 As shown, one aspect of the embodiments of the present invention provides a method for preparing a graphene-modified cemented carbide, which includes:

[0020] Uniformly mix graphite, dispersant, cemented carbide and solvent, and perform high-energy ball milling to exfoliate graphite into graphene to obtain cemented carbide composite powder containing graphene and cemented carbide;

[0021] The cemented carbide composite powder is granulated, pressed, degummed and sintered to obtain a graphene-modified cemented carbide.

[0022] Further, the graphite includes natural flake graphite and / or expanded graphite.

[0023] Furthermore, the graphite sheet diameter is 1 μm-5 mm.

[0024] Further, the content of graphite in the cemented carbide composite powder is 0.05-5 wt%.

[0025] Further, the cemented carbide includes a combination of at least one of carbides such as WC, CrC and TaC, and Co.

[0026] Furthermore, the cemented carbide contains 80-95wt% WC, 0....

Embodiment 1

[0047]Mix natural flake graphite (mass fraction of 1wt%) with a sheet diameter of 1mm, polyvinylpyrrolidone (mass fraction of 1wt%), WC, CrC, Co and other powders (YG8 cemented carbide powder) in ethanol, and pass through planetary Ball milling, the grinding medium is a cemented carbide ball with a diameter of 5 mm, the rotation speed is 500 rpm, and the grinding is performed for 48 hours, followed by drying to obtain a cemented carbide composite powder of graphene and cemented carbide powder. The cemented carbide composite powder was mixed and granulated with 2wt% polyvinyl alcohol solution, and then molded under a pressure of 200MPa, followed by degumming at 400°C for 2 hours, and the heating rate was 2°C / min. Then sintering at 1350° C. under low pressure for 5 hours to prepare a graphene-modified cemented carbide material. The bending strength was tested by a three-point bending test method, and the hardness was tested by a Rockwell hardness tester. The test results are sho...

Embodiment 2

[0049] The natural flake graphite (mass fraction is 3wt%) with a sheet diameter of 500 μm is mixed with sodium lauryl sulfate (mass fraction is 1.5wt%), WC, CrC, Co and other powders (YG8 cemented carbide powder) in water, Grinding by planetary ball milling, the grinding medium is a cemented carbide ball with a diameter of 5 mm, the rotation speed is 200 rpm, and the grinding is carried out for 96 hours, followed by drying to obtain a cemented carbide composite powder of graphene and cemented carbide powder. The cemented carbide composite powder was mixed and granulated with 2wt% polyvinyl alcohol solution, and then molded under a pressure of 300MPa, followed by degumming at 400°C for 2 hours, with a heating rate of 2°C / min. Then sintering at 1350° C. under low pressure for 5 hours to prepare a graphene-modified cemented carbide material. The bending strength was tested by a three-point bending test method, and the hardness was tested by a Rockwell hardness tester. The test re...

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Abstract

The invention discloses a graphene modified hard alloy and a preparation method thereof. The preparation method includes: uniformly mixing graphite, dispersant, hard alloy and solvent, and performing high-energy ball milling treatment to exfoliate the graphite into graphene to obtain a cemented carbide composite powder comprising graphene and hard alloy, and then carry out Drying, granulation, press molding, degumming, sintering and other treatments to obtain graphene modified hard alloy. The invention utilizes the cemented carbide powder ball milling process, which can realize the exfoliation and dispersion of graphene and the ball milling refinement of cemented carbide powder at the same time, avoid the cumbersome process of exfoliating graphene alone, and precisely combine the powder metallurgy process without changing the existing process conditions. At the same time, the graphene exfoliated in situ by mechanical ball milling has the advantages of complete structure and low defect level, which can significantly improve its sintering stability, and has a significant effect on the performance of cemented carbide and grain refinement. effect and has important industrial application prospects.

Description

technical field [0001] The invention relates to a hard alloy material, in particular to a preparation method of a graphene-modified hard alloy, and belongs to the technical field of new materials. Background technique [0002] Cemented carbide has a high melting point carbide as the hard phase, metal Co or Ni as the binder of the cermet composite material, has ultra-high hardness and strength, excellent red hardness, is widely used in machinery, mining, petroleum, Drilling and other industries, known as industrial teeth. With the growth of economic level and scale, the demand for cemented carbide in the industrial field is increasing, and more stringent requirements are put forward for its performance. It is necessary to take into account the matching of hardness, strength and toughness to be competent for high precision and high efficiency. cutting process. The improvement of strength and toughness can be achieved by further refining the grain size, which has become a res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/05C22C29/08C01B32/19
CPCC22C1/051C22C29/067C22C29/08C01B32/19
Inventor 陈名海马青龙刘宁李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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