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Preparation method of hard alloy mixture

Inactive Publication Date: 2020-04-17
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the crushing effect of ball milling, the particle size distribution range of the powder after ball milling is widened, the obtained powder has many defects, high activity, and the tendency of grain growth during sintering is large, resulting in the distribution of WC in the metallographic structure of cemented carbide. Wider, resulting in fluctuations in cemented carbide properties
[0005] Therefore, the existing cemented carbide ball milling process has problems such as powder oxidation, widening of WC powder particle size distribution, many WC crystal defects, and wide WC grain size distribution of the prepared alloy.

Method used

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  • Preparation method of hard alloy mixture
  • Preparation method of hard alloy mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] WC powder with a particle size of 4.5 μm and Co powder with a particle size of 1.3 μm are used to mix the powder according to the weight ratio WC:Co=90:10, and the dispersion medium is alcohol, which is added at a rate of 350ml per kilogram of powder, and 2.5% ( weight ratio) of emulsified paraffin wax, add 0.01% sorbitan monostearate by powder weight ratio, add Carboresin by 0.5% powder weight ratio, to improve the viscosity of slurry, dispersion cylinder airtight, Fill with nitrogen to prevent the air from entering, the speed of the dispersion disc is 2000rpm, after 6 hours of high-speed dispersion, the powder is dried at a temperature of 100°C, pressed into shape, and sintered at 1390°C for 60 minutes in a low-pressure sintering furnace integrating the release agent and sintering .

Embodiment 2

[0042] WC powder with a particle size of 0.5 μm and Co powder with a particle size of 0.8 μm are used, and the powder is mixed according to the weight ratio WC:Co=88:12. The dispersion medium is water, and the ratio of 200ml per kilogram of powder is added, and 2% ( weight ratio) of PEG, add 1% sorbitan monostearate by powder weight ratio, add methyl cellulose by 0.5% powder weight ratio, to improve the viscosity of slurry, disperse after vacuumizing The cylinder is sealed, the rotating speed of the dispersing disc is 3000rpm. After 10 hours of high-speed dispersion, the powder is dried at a temperature of 90°C, pressed into shape, and sintered at 1450°C for 30 minutes in a low-pressure sintering furnace integrating the release agent and sintering.

Embodiment 3

[0044] WC powder with a particle size of 1.0 μm and Co powder with a particle size of 1.0 μm are used to mix the powder according to the weight ratio WC:Co=90:10, and the dispersion medium is acetone, which is added at a rate of 500ml per kilogram of powder, and 5% ( weight ratio) of emulsified paraffin wax, add 2% sorbitan monostearate by powder weight ratio, add ethyl cellulose by 2% powder weight ratio, to improve the viscosity of slurry, dispersing cylinder pumping After vacuuming, fill it with nitrogen gas and seal it. The rotating speed of the dispersion disc is 500rpm. After 15 hours of high-speed dispersion, the powder is dried at a temperature of 100°C, pressed and formed, and sintered at 1360°C for 90 minutes in a low-pressure sintering furnace integrating the release agent and sintering. .

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Abstract

The invention relates to a preparation method of a hard alloy mixture. A dispersion medium is input according to the material weight ratio being 100-500 ml / Kg, a rotor is stretched into a dispersion barrel of a dispersion machine, a dispersion disc is installed on the rotor and rotates along with the rotor at the rotating speed being 10-200 rpm, 0.01%-2% of the dispersion agent, 0.1%-2% of an anti-setting agent and 0.1%-5% of a forming agent are added, component powder of the hard alloy is then input into the dispersion barrel, the rotating speed of the dispersion disc is increased to 200-3000rpm, and the dispersion time is 5-24 h; and the component powder of a hard alloy is mixed through the dispersion disc, and slurry sufficiently flows so that dispersing and mixing of the powder can beachieved. The existing material crystal structure and size distribution cannot be damaged by high-speed mixing or dispersing, breakage of WC particles in the ball milling process is avoided, a more uniform metallographic structure is obtained, and higher transverse breaking strength and breaking tenacity are achieved.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide mixture. Background technique [0002] At present, in the cemented carbide production process, wet ball milling and stirring ball milling are usually used to prepare cemented carbide mixtures. The ball mill consists of a metal cylinder and balls. Its working principle is that when the cylinder rotates, the grinding body (ball) and the object to be ground (material) installed in the cylinder rotate with the cylinder under the action of friction and centrifugal force. It reaches a certain height and then falls automatically. The stirring effect of the ball will mix the materials evenly. In addition, the impact and grinding effect on the materials in the cylinder will also grind the materials; the factors that affect the efficiency of the ball mill are mainly the ball mill besides the structure of the ball mill. The rotating speed, the size and quantity of the grinding body, the volume of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/044
Inventor 徐纯芳罗蒙黄庆明
Owner SHAREATE TOOLS
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