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Tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers, and preparation method thereof

A technology of tungsten carbide composite materials and silicon nitride whiskers, which is applied in the field of tungsten carbide materials and its preparation, can solve the problems of low fracture toughness, hindering the application of materials, and waiting for further development and research, and achieve high hardness, oxidation resistance and resistance Effects of improved corrosion performance and excellent wear resistance

Inactive Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent 200410068022.8 discloses a sintering method of ultra-fine pure tungsten carbide. This method uses spark plasma sintering technology to prepare pure WC material without any binder phase. The obtained dense pure WC material has extremely high hardness and excellent Wear resistance, but due to its low fracture toughness, the application of this material is seriously hindered
However, this method is currently limited to Al 2 o 3 base and Si 3 N 4 Among the few materials such as base, its application still needs to be further developed and researched.

Method used

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  • Tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers, and preparation method thereof
  • Tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers, and preparation method thereof
  • Tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0078] The preparation method of the tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers comprises the following steps and process conditions:

[0079] Step 1: Prepare materials

[0080] Will WC, Al 2 o 3 , a-Si 3 N 4 The powder is proportioned according to the following mass percentages: WC 96%, Al 2 o 3 1%, a-Si 3 N 4 3%, the rest are unavoidable trace impurities; WC powder purity ≥ 98.7%, particle size about 100nm, Al 2 o 3 Powder purity ≥ 99.9%, particle size 1 ~ 2μm, a-Si 3 N 4 The oxygen content on the surface of the powder is 3-5wt.%, and the particle size is 0.8-1 μm.

[0081] Step 2: Powder dispersion and mixing

[0082] Submerge the above-mentioned raw material powder in ethanol, perform ultrasonic vibration and mechanical stirring to disperse the agglomerated powder, and then perform wet low-energy ball milling on the obtained slurry. The ball mill used is planetary, and the ball mill (500mL) and the ball ...

Embodiment 2

[0089] The preparation method of the tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers comprises the following steps and process conditions:

[0090] Step 1: Prepare materials

[0091] Will WC, Al 2 o 3 , a-Si 3 N 4 The powder is proportioned according to the following mass percentages: WC 94%, Al 2 o 3 1%, a-Si 3 N 4 5%, the rest are unavoidable trace impurities; WC powder purity ≥ 98.7%, particle size about 100nm, Al 2 o 3 Powder purity ≥ 99.9%, particle size 1 ~ 2μm, a-Si 3 N 4 The oxygen content on the surface of the powder is 3-5wt.%, and the particle size is 0.8-1 μm.

[0092] Step 2: Powder dispersion and mixing

[0093] Submerge the above-mentioned raw material powder in ethanol, perform ultrasonic vibration and mechanical stirring to disperse the agglomerated powder, and then perform wet low-energy ball milling on the obtained slurry. The ball mill used is planetary, and the ball mill (500mL) and the ball ...

Embodiment 3

[0100] The preparation method of the tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers comprises the following steps and process conditions:

[0101] Step 1: Prepare materials

[0102] Will WC, Al 2 o 3 , a-Si 3 N 4 The powder is proportioned according to the following mass percentages: WC 97%, Al 2 o 3 1%, a-Si 3 N 4 2%, the rest are unavoidable trace impurities; WC powder purity ≥ 98.7%, particle size about 100nm, Al 2 o 3 Powder purity ≥ 99.9%, particle size 1 ~ 2μm, a-Si 3 N 4 The oxygen content on the surface of the powder is 3-5wt.%, and the particle size is 0.8-1 μm.

[0103] Step 2: Powder dispersion and mixing

[0104] Submerge the above-mentioned raw material powder in ethanol, perform ultrasonic vibration and mechanical stirring to disperse the agglomerated powder, and then perform wet low-energy ball milling on the obtained slurry. The ball mill used is planetary, and the ball mill (500mL) and the ball ...

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Abstract

The invention discloses a tungsten carbide composite material containing aluminum oxide particles and silicon nitride whiskers, and a preparation method thereof. The tungsten carbide composite material contains components of, by mass: 0.5 to 3% of aluminum oxide particles, 0.4 to 10% of silicon nitride whiskers, and balance of tungsten carbide and inevitable impurity phases. The silicon nitride whiskers are in-situ synthesized beta-Si3N4 whiskers. The WC composite material provided by the invention contains no metallic binding phase, and has excellent hardness, excellent wear resistance, excellent high-temperature mechanical properties, and medium toughness. With the material and the method provided by the invention, preparation cost of the WC composite material can be reduced, and the application range of the material is widened. The material is suitable to be produced into cutting tools such as indexable inserts, plastic working tools such as wire drawing dies, and shearing tools such as punching shear dies.

Description

technical field [0001] The present invention relates to a kind of tungsten carbide (WC) material and its preparation method, specifically refers to the 2 o 3 ) particles and silicon nitride (β-Si 3 N 4 ) whisker tungsten carbide composite material and preparation method. Background technique [0002] Traditional cemented carbide is composed of hard WC phase and low-melting metal binder phase, in which WC has extremely high hardness and excellent oxidation resistance and corrosion resistance, and the addition of metal binders is inevitable It will weaken the hardness, wear resistance, oxidation resistance and corrosion resistance of the alloy, and it is also likely to reduce the wear resistance of the alloy, especially at high temperatures, the metal bond phase is easy to soften and oxidize, etc. This makes WC cemented carbide prone to premature failure, thereby limiting the application range of WC cemented carbide. For this reason, researchers in this field have been wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/81C04B35/78C04B35/622
CPCC04B35/645C04B35/56C04B2235/6581C04B35/6264C04B2235/6562C04B2235/6565C04B2235/661C04B2235/785C04B2235/6567C04B2235/3873C04B35/5626C04B35/6261C04B35/78C04B2235/3217C04B2235/3895C04B2235/5276C04B35/622C04B2235/5445C04B2235/96C04B2235/666C04B35/6265C04B35/80
Inventor 李元元李小强郑东海屈盛官杨超邵明肖志瑜
Owner SOUTH CHINA UNIV OF TECH
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