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Binding-phase-free WC-based hard alloy cutter material and preparation method thereof

A cemented carbide and no binder phase technology, which is applied in the field of no binder phase WC-based cemented carbide tool materials and its preparation, can solve problems such as uneven heat distribution, adverse effects of material densification, and impact on tool heat dissipation

Inactive Publication Date: 2020-04-24
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stacking of graphene sheets and the agglomeration of carbon nanotubes have become the main factors restricting the further improvement of its strengthening and toughening effect. In addition, graphene has a two-dimensional planar structure for heat conduction, and carbon nanotubes have a one-dimensional columnar structure. For axial heat conduction, using it alone as a strengthening and toughening phase of ceramic tool materials will often lead to uneven distribution of heat along the vertical graphene plane or carbon nanotube axis during sintering, which will adversely affect the densification of the material and affect the cutting tool at the same time. The cooling capacity of the tool cannot effectively meet the requirements of the tool material

Method used

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preparation example Construction

[0030] A method for preparing a binder-free WC-based cemented carbide cutting tool material, comprising the following steps:

[0031] 1) According to mass percentage, nano carbide ceramics: 2.5% to 5%, nano oxide ceramics: 2.5% to 5%, graphene / carbon nanotube hybrid powder: 0.1 to 0.5%, and the balance is tungsten carbide Binder;

[0032] 2) Nano-composite ceramics doped phase dispersion: mix and disperse nano-carbide ceramics and nano-oxide ceramics evenly to obtain a nano-ceramic suspension;

[0033] Specifically: fully mix the nano-carbide ceramics and nano-oxide ceramics in the dispersion medium and the compound dispersant; add the nano-carbide ceramics to the dispersion medium and the compound dispersant to disperse to obtain a nano-carbide ceramic suspension; similarly Obtain nano-oxide ceramic suspension, then mix nano-oxide ceramic suspension and nano-carbide ceramic suspension, adjust the pH to 7-10 with ammonia water and hydrochloric acid, heat and ultrasonically di...

Embodiment 1

[0050] (1) With 0.3μm tungsten carbide (WC), 40nm silicon carbide whisker (SiC), 50nm zirconia (ZrO 2 ), multilayer graphene and carbon nanotubes as raw materials, according to 91.8% WC, 3% SiC, 5% ZrO 2 And 0.2% graphene / carbon nanotube hybrid powder mass ratio.

[0051] (2) Nano-SiC and nano-ZrO 2 For dispersion, use absolute ethanol as the dispersion medium, add 1.5% compound dispersant (polyethylene glycol: polyvinylpyrrolidone = 1:1) relative to the mass of nano-composite ceramic particles to form a suspension, and adjust the pH to 9 with ammonia water and hydrochloric acid. Heat and ultrasonically disperse in a water bath at 80° C. for 30 minutes to obtain a nanocomposite ceramic suspension.

[0052] (3) According to the proportioning of step (1), and keeping the mass ratio of graphene and carbon nanotubes at 2:1, the graphene and carbon nanotubes are oxidized to introduce carboxyl groups, and then the oxidized carbon nanotubes are hydroxylated. A hydroxyl group is in...

Embodiment 2

[0057] (1) 0.3μm tungsten carbide (WC), 80nm chromium carbide (Cr 3 C 2 ), 60nm yttrium oxide (Y 2 o 3 ), graphene and carbon nanotubes as raw materials, according to 94.5% WC, 2.5% Cr 3 C 2 , 2.5% Y 2 o 3 And 0.5% graphene / carbon nanotube hybrid powder mass ratio.

[0058] (2) Nano-Cr 3 C 2 and Nano Y 2 o 3 For dispersion, use absolute ethanol as the dispersion medium, add 1.5% compound dispersant (polyethylene glycol: polyvinylpyrrolidone = 1:1) relative to the mass of nano-composite ceramic particles to form a suspension, and adjust the pH to 9 with ammonia water and hydrochloric acid. Heat and ultrasonically disperse in a water bath at 80° C. for 45 minutes to obtain a nanocomposite ceramic suspension.

[0059] (3) Proportioning according to step (1), and keeping the mass ratio of graphene oxide and carbon nanotubes at 1.5:1, graphene adopts deionized water as dispersion medium, adds 75% mass ratio polyvinylpyrrolidone, at 80 DEG C Heat and ultrasonically dispe...

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Abstract

The invention discloses a binding-phase-free WC-based hard alloy cutter material and a preparation method thereof. According to the invention, tungsten carbide is used as a base material; nano complexphase ceramic doping is adopted, and the effects of defect reinforced sintering and liquid-phase reinforced sintering are synergistically exerted; meanwhile, two-dimensional graphene nanosheets and one-dimensional carbon nanotubes are hybridized to serve as a synergistic strengthening and toughening phase and a densification phase of the binding-phase-free WC-based hard alloy cutter material; thegraphene is loaded with carbon nanotube, the graphene is supported by the carbon nanotubes; a three-dimensional strengthening and toughening and rapid heat conduction network is constructed; dispersing agents which enable the two components to be mutually dispersed; a contact area of the graphene-carbon nano tube and a cutter material matrix is increased, and a graphene and carbon nano tube synergistic toughening mechanism and a synergistic heat conduction mechanism are formed in the aspect of function, so that the bending strength, Vickers hardness and fracture toughness mechanical properties of the obtained binding-phase-free WC-based hard alloy cutter material are greatly improved. The adopted graphene-carbon nanotube three-dimensional space structure has a high heat conduction coefficient, and the heat dissipation capacity of the cutter is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of cutting tool materials, and in particular relates to a WC-based cemented carbide cutting tool material without a binder phase and a preparation method thereof. Background technique [0002] As one of the most important common technologies in advanced manufacturing technology, high-speed cutting technology is an important guarantee for improving the quality of parts and processing efficiency. Among them, high-speed cutting tool technology is the most critical core element in high-speed cutting. The research and development is suitable for high-efficiency, High-quality machined tool materials are one of the basic prerequisites for giving full play to the effectiveness of high-speed cutting. At present, the tool materials used for high-speed cutting mainly include: diamond, cubic boron nitride, ceramics, hard alloy and high-speed steel. The hardness of cemented carbide is slightly lower than diamond, cubic ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/56
CPCC04B35/5626C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3244C04B2235/3826C04B2235/3839C04B2235/3843C04B2235/425C04B2235/5288C04B2235/6562C04B2235/6565C04B2235/6567
Inventor 孙加林皇志富闫柯陈飞坚永鑫杨贺杰李博
Owner XI AN JIAOTONG UNIV
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