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Micro-nano composite ceramic cutter material and preparation method thereof

A ceramic tool and micro-nano composite technology, which is applied in the field of mechanical cutting tool manufacturing, can solve the problems of easy agglomeration of composite materials, unclear strengthening and toughening effect, and affecting the performance of graphene, so as to improve the bending strength and fracture toughness, Reduce heat dissipation time and improve the effect of density

Inactive Publication Date: 2019-10-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the inventors have found that the above-mentioned graphene toughened ceramic materials are mostly for single-phase ceramics. At present, there are few studies on graphene toughened multiphase ceramic tool materials, and the toughening effect is still unclear.
In addition, due to the strong van der Waals force between graphene layers, it is easy to agglomerate in composite materials, which affects the performance of graphene.

Method used

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  • Micro-nano composite ceramic cutter material and preparation method thereof
  • Micro-nano composite ceramic cutter material and preparation method thereof
  • Micro-nano composite ceramic cutter material and preparation method thereof

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preparation example Construction

[0033] In another specific embodiment of the present invention, the preparation method of the above-mentioned micro-nano composite ceramic cutting tool material is provided, which specifically includes the following steps:

[0034] Mix the nano-titanium carbide suspension and the graphene suspension, and weigh the Al according to the composition of the raw materials 2 o 3 , WC, MgO, Y 2 o 3 , Co is added to the mixed suspension, and ultrasonic dispersion is continued; the uniformly dispersed mixed suspension is ground, and after drying, a uniformly mixed raw material powder is obtained; the raw material powder is hot-pressed and sintered.

[0035] In yet another specific embodiment of the present invention, the preparation method of the nano-titanium carbide suspension includes: adding nano-titanium carbide to absolute ethanol, and configuring a suspension with a concentration of 1-5% (preferably 2%), Add polyethylene glycol (PEG) after ultrasonic dispersion, adjust the pH ...

Embodiment 1

[0045] (1) With 0.5μm Al 2 o 3 , 0.4μm WC, 40nm TiC, 0.5μm MgO, 0.5μm Y 2 o 3 , 1μm Co is the raw material, and the volume fraction of each raw material is: 72% Al 2 o 3 , 18% WC, 6% TiC, 0.5% MgO, 0.5% Y 2 o 3 , 3% Co.

[0046] (2) Add the weighed nano-TiC to absolute ethanol, configure a suspension with a concentration of 2%, and disperse it ultrasonically for 10 minutes; weigh polyethylene glycol (PEG) accounting for 0.5% of the mass fraction of nano-TiC, add Into the nano-TiC suspension, adjust the pH value to 9 with ammonia water and hydrochloric acid, and continue ultrasonic dispersion for 20 minutes to obtain a nano-TiC suspension with good dispersion performance.

[0047] (3) Weigh Al according to the composition of raw materials 2 o 3 , WC, MgO, Y 2 o 3 , Co, added to the dispersed nano-TiC suspension, and continued to ultrasonically disperse for 2 hours to obtain a stable raw material suspension; the dispersed raw material suspension was added to the ball ...

Embodiment 2

[0051] (1) With 0.5μm Al 2 o 3 , 0.4μm WC, 40nm TiC, 0.5μm MgO, 0.5μm Y 2 o 3 , 1μm Co and single-layer graphene powder (chemical method, thickness: 0.8-1.2nm, sheet diameter: 0.5-5μm) are raw materials, and the volume fraction of each raw material is: 71.75% Al 2 o 3 , 18% WC, 6% TiC, 0.5% MgO, 0.5% Y 2 o 3 , 3% Co, 0.25% graphene.

[0052] (2) Add the weighed nano-TiC to absolute ethanol, configure a suspension with a concentration of 2%, and disperse it ultrasonically for 10 minutes; weigh polyethylene glycol (PEG) accounting for 0.5% of the mass fraction of nano-TiC, add Into the nano-TiC suspension, adjust the pH value to 9 with ammonia water and hydrochloric acid, and continue ultrasonic dispersion for 20 minutes to obtain a nano-TiC suspension with good dispersion performance. Take by weighing the polyvinylpyrrolidone (PVP) that accounts for 60% of graphene quality, join in dehydrated alcohol, be configured into the suspension that concentration is 0.1mg / ml, ultr...

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Abstract

The invention provides a micro-nano composite ceramic cutter material and a preparation method thereof. The cutter material is prepared with micron aluminum oxide as a matrix, micron tungsten carbideand nano titanium carbide as second-phase materials, graphene as a strengthening and toughening phase, micron magnesium oxide and micron yttrium oxide as sintering aids and micron metal cobalt as a metal binder. Based on interface physical regulation and control and interface stress regulation and control, a reasonable graphene / ceramic strong and weak interface ratio is designed and constructed, so that the aluminum oxide / tungsten carbide / titanium carbide / graphene micro-nano composite ceramic cutter material which is compact in structure, fine in particle and excellent in performance is finally prepared. The material is suitable for high-speed cutting machining of quenched steel, ultrahigh-strength steel and other difficult-to-machine materials, and has good practical application value.

Description

technical field [0001] The invention belongs to the technical field of mechanical cutting tool manufacturing, and in particular relates to a micro-nano composite ceramic tool material and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Due to the advantages of high hardness, good heat resistance and wear resistance, and excellent chemical stability, alumina-based ceramics are considered to be ideal tool materials for high-speed cutting of hardened steel and ultra-high-strength steel. However, the low fracture toughness limits the practical application of alumina-based ceramic cutting tools. Therefore, the "toughening and strengthening" of al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/645C04B35/634
CPCC04B35/10C04B35/622C04B35/63444C04B35/63488C04B35/645C04B2235/3206C04B2235/3225C04B2235/3843C04B2235/3847C04B2235/405C04B2235/422C04B2235/5436C04B2235/5454C04B2235/6562C04B2235/6567
Inventor 王旭超赵军孙哲飞
Owner SHANDONG UNIV
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