Preparation method of tungsten carbide-cobalt cemented carbide

A technology of cemented carbide and tungsten carbide, which is applied in the field of preparation of tungsten carbide-cobalt cemented carbide, can solve the problems affecting the structure and performance of the alloy, the growth of WC grains, and the growth of particle bonding, so as to improve the dispersion degree, inhibition of growth, and effect of reducing diffusion pathways

Active Publication Date: 2018-09-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using traditional vacuum and low-pressure sintering technology to prepare cemented carbide, in order to make the densification close to the best and eliminate pores as much as possible, the sintering temperature must exceed the eutectic temperature of the W-Co-C system of 1320°C and keep it for a long time, so that the WC phase meets The dissolution-precipitation phenomenon occurs, which makes

Method used

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  • Preparation method of tungsten carbide-cobalt cemented carbide
  • Preparation method of tungsten carbide-cobalt cemented carbide
  • Preparation method of tungsten carbide-cobalt cemented carbide

Examples

Experimental program
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Effect test

Embodiment 1

[0020] According to the ratio of WC-6%Co, weigh 176.4g of W powder with an average particle size of 0.8μm, 12g of Co powder with an average particle size of 1.0μm, and 11.6g of carbon black with an average particle size of 0.6μm and a purity of 99%. Put in the cemented carbide ball mill tank lined with the ball, add 1000g of cemented carbide balls with a diameter of 10mm according to the ball-to-material ratio of 5:1, the ball milling medium is absolute ethanol, ball mill for 48h, then put the powder into a vacuum oven for drying, Sieve to obtain superfine tungsten-cobalt-carbon mixed powder;

[0021] Put 300mL of absolute ethanol into the beaker, heat it in a water bath to 80°C, weigh 2g of paraffin, pour it into the beaker and keep stirring, pour in the ultra-fine crystal tungsten-cobalt carbon mixed powder prepared by ball milling, continue heating and stirring in a water bath until no Evaporate water and ethanol to a viscous state; put it in a vacuum drying oven to dry, an...

Embodiment 2

[0024] According to the WC-13%Co ratio, weigh 81.7g of W powder with an average particle size of 0.6μm, 13g of Co powder with an average particle size of 0.8μm, and 2.7g of carbon black with an average particle size of 0.3μm and a purity of 99.9%. Put 6.7g of pure glucose into the lined cemented carbide ball mill tank, add 1000g of cemented carbide balls with a diameter of 10mm according to the ball-to-material ratio of 10:1, the ball milling medium is absolute ethanol, ball mill for 24 hours, and then put the powder into Dry in a vacuum drying oven, and sieve to obtain an ultrafine crystal tungsten-cobalt-carbon mixed powder;

[0025] The ultra-fine-grained tungsten-cobalt-carbon mixed powder is put into a high-strength graphite mold, and put into a discharge plasma sintering equipment for in-situ reaction synthesis and densification sintering. The sintering process parameters are: sintering pressure 60MPa, heating rate 100℃ / min, at Insulate at 900°C for 10 minutes, hold at 1...

Embodiment 3

[0027] According to the WC-10%Co ratio, weigh 168.9g of W powder with an average particle size of 0.1μm, 20g of Co powder with an average particle size of 0.1μm, and 5.55g of carbon black with an average particle size of 0.1μm and a purity of 99.99%. Put 13.89g of pure glucose into the lined cemented carbide ball mill tank, add 600g of cemented carbide balls with a diameter of 10mm according to the ball-to-material ratio of 3:1, the ball milling medium is absolute ethanol, ball mill for 96h, and then put the powder into Dry in a vacuum drying oven, and sieve to obtain an ultrafine crystal tungsten-cobalt-carbon mixed powder, and its scanning electron microscope picture is as follows: figure 1 As shown, the dispersibility of the powder after ball milling is better and W and C can be in contact, which is beneficial to the subsequent reaction and sintering;

[0028] Put 400mL of absolute ethanol into the beaker, heat it in a water bath to 60°C, weigh 4g of paraffin, pour it into ...

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Abstract

The invention discloses a method for preparing tungsten carbide-cobalt cemented carbide by one step through discharge plasma in-situ synthesis. The method comprises the steps that tungsten powder, cobalt powder, carbon black, glucose and paraffin are used as raw materials, and the tungsten powder, the cobalt powder, the carbon black and the glucose are subjected to ball milling and mixing in proportion and then are dried and sieved for standby application; the paraffin is heated and dissolved through anhydrous ethyl alcohol and poured into ultrafine-grain tungsten-cobalt mixed powder and is continuously subjected to water-bath heating and stirring until the anhydrous ethyl alcohol is volatilized; the obtained product is dried, sieved and charged into a high-strength graphite mold and is subjected to discharge plasma sintering, and the WC grain controllable compact tungsten carbide-cobalt cemented carbide is prepared by controlling the processes such as the heating rate, the pressurization rate and the heat holding time. Through the method, the preparation process of the cemented carbide can be effectively shortened, and the comprehensive performance of the cemented carbide can be improved.

Description

technical field [0001] The invention relates to a preparation method of tungsten carbide-cobalt hard alloy, in particular to a method for preparing tungsten carbide-cobalt hard alloy in one step by using discharge plasma in-situ synthesis, which belongs to the field of material preparation. Background technique [0002] Tungsten carbide-cobalt cemented carbide is mainly composed of hard and wear-resistant WC phase and Co phase with good toughness. When using traditional vacuum and low-pressure sintering technology to prepare cemented carbide, in order to make the densification close to the best and eliminate pores as much as possible, the sintering temperature must exceed the eutectic temperature of the W-Co-C system of 1320°C and keep it for a long time, so that the WC phase meets The dissolution-precipitation phenomenon occurs, which makes the WC grains grow; at the same time, at this high temperature, solid-phase sintering easily occurs between WC particles, and the parti...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/055C22C29/005C22C29/067C22C29/08
Inventor 易健宏郭圣达鲍瑞刘亮杨平
Owner KUNMING UNIV OF SCI & TECH
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