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A kind of preparation method of wc-co cemented carbide mixture

Active Publication Date: 2021-11-23
NANJING HANRUI COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, cobalt powder is easily alloyed in the process of high energy ball milling, and can be welded into metal cobalt
These factors will affect the uniform distribution of Co among WC particles, resulting in uneven mixing of WC+Co mixture, and the formation of "cobalt pool" during sintering, which will affect the structure and performance of sintered products.

Method used

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  • A kind of preparation method of wc-co cemented carbide mixture
  • A kind of preparation method of wc-co cemented carbide mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the rolling ball mill, add 8kg of hard alloy grinding balls with a diameter of 5mm, 400mL of alcohol with a purity of 95wt%, and then add 1840g of WC powder with an average particle size of 0.6μm and 225g of cobalt oxide with an average particle size of 0.8μm, and the filling factor is 0.5 . The rotational speed of the ball mill is set to 35 rpm, the ball milling time is set to 4 hours, and the ball mill is started for ball milling. After ball milling, use 80-mesh sieve to filter and discharge the slurry, transfer it to a vacuum drying oven for drying, the drying temperature is set at 90°C, the vacuum degree is controlled below 0.03MPa, and it is cooled to room temperature after all the alcohol is volatilized.

[0023] Set the reaction temperature of the continuous push boat reduction furnace to 420 °C, H 2 Flow control at 3.0m 3 / h, the reduction reaction time is 150min, and then put the dried precursor mixture into the reduction furnace for hydrogen reduction rea...

Embodiment 2

[0025] In the rolling ball mill, add 8 kg of cemented carbide grinding balls with a diameter of 5 mm and 400 mL of alcohol with a purity of 95 wt %; then add 1727 g of WC powder with an average particle size of 0.8 μm and 338 g of cobalt oxide with an average particle size of 1.0 μm, and the filling factor is 0.5. The rotating speed of the ball mill is set to 33rpm, the ball milling time is set to 10 hours, and the ball mill is started for ball milling. After ball milling, use 80-mesh sieve to filter and discharge the slurry, transfer it to a vacuum drying oven for drying, set the drying temperature at 90°C, and control the vacuum degree below 0.03MPa, and cool to room temperature after all the alcohol is volatilized.

[0026] Set the reaction temperature of the continuous push boat reduction furnace at 440°C, and control the hydrogen flow rate at 3.0m 3 / h, the reduction reaction time is 180min, and then put the dried mixture into the reduction furnace for hydrogen reduction ...

Embodiment 3

[0028] In the rolling ball mill, add 6 kg of cemented carbide grinding balls with a diameter of 5 mm and 400 mL of alcohol with a purity of 95 wt %; add 1643 g of WC powder with an average particle size of 1.0 μm and 422 g of cobalt oxide with an average particle size of 1.2 μm, and the filling factor is 0.4. The rotating speed of the ball mill is set to 36 rpm, the ball milling time is set to 70 hours, and the ball mill is started for ball milling. After ball milling, use 80-mesh sieve to filter and discharge the slurry, transfer it to a vacuum drying oven for drying, set the drying temperature at 90°C, and control the vacuum degree below 0.03MPa, and cool to room temperature after all the alcohol is volatilized.

[0029] Set the reaction temperature of the continuous push boat reduction furnace at 460°C, and control the flow rate of hydrogen at 2.5m 3 / h, the reduction reaction time is 210min, and then put the dried mixture into the reduction furnace for hydrogen reduction ...

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Abstract

The invention discloses a preparation method of a WC-Co cemented carbide mixture, which comprises the following steps: (1) adding a ball milling medium into a ball mill; (2) putting cobalt oxide powder and tungsten carbide powder into the ball mill for grinding, Mix evenly to make a slurry; (3) vacuum dry the slurry to obtain a primary mixture; (4) reduce the primary mixture with hydrogen in a reduction device, and the reduced material is cooled and sieved to obtain WC- Mixture of Co cemented carbide. The distribution of Co element among the WC particles in the mixture prepared by the present invention is more uniform than that obtained by the traditional method, and the average particle size and particle size distribution of the Co powder before mixing can be maintained, and the prepared mixture has a large bulk density , At the same time, it will not bring in impurities, which is conducive to improving the performance and quality stability of cemented carbide products.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a WC-Co cemented carbide mixture. Background technique [0002] WC-Co cemented carbide is prepared by mixing WC powder and Co powder evenly according to a certain ratio, adding forming agent, and going through molding, sintering, subsequent processing and other processes. WC-Co cemented carbide is widely used in cutting tools, impact tools, wear-resistant and corrosion-resistant parts and other fields because of its high strength and high hardness, and is called "the tooth of industry". Among them, the preparation of WC+Co mixture is a key process in the process of cemented carbide preparation. WC is the chemical name for tungsten carbide. [0003] At present, cemented carbide mixtures are mostly prepared by mechanical mixing of WC powder and Co powder. The process is to select WC powder and Co powder with a particle size that meets...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 卓海鸥陈青林
Owner NANJING HANRUI COBALT