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Preparation method of nano hard alloy

A cemented carbide and nanotechnology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of tungsten alloy physical properties, tungsten carbide grain growth, uneven structure, etc., to improve the uniformity of material distribution , reduce the abnormal growth of grains, and improve the effect of transverse fracture toughness

Active Publication Date: 2022-08-05
晋城鸿智纳米光机电研究院有限公司 +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, the abnormal growth of tungsten carbide will occur during the sintering process of ultra-fine and nano-scale cemented carbide, which has a great negative impact on the performance of alloy tools (such as hardness and wear resistance)
For example, in the production process of cemented carbide, due to the uneven distribution of components in the powder, especially the uneven distribution of cobalt, it will cause the rapid growth of tungsten carbide grains in the initial stage of sintering densification, and with the sintering Inhomogeneous microstructure, which in turn negatively affects the physical properties of tungsten alloys

Method used

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preparation example Construction

[0034] The embodiment of the present application provides a preparation method of a nanometer cemented carbide, comprising the following steps:

[0035] Step S1: provide a ball mill, dissolve the dispersant in part of absolute ethanol, add powdered tungsten carbide, powdered cobalt, nucleation inhibitor, paraffin and remaining absolute ethanol into the ball mill, and continue ball milling to obtain the first nano-hard It is made of alloy compound, and the dispersant includes fatty alcohol polyoxyethylene ether, polyglycerol-6 laurate and stearic acid.

[0036] Fatty alcohol polyoxyethylene ether is a good surfactant, which can be well dissolved in paraffin to improve the activity of paraffin molecules and accelerate the dispersing speed of paraffin in the mixture; moreover, fatty alcohol polyoxyethylene ether can also reduce the The surface activity of powdered tungsten carbide and cobalt can improve the dispersibility of the powder; however, the fatty alcohol polyoxyethylene ...

Embodiment 1

[0070] The embodiments of the present application provide a method for preparing a nano-hard alloy, which includes the following components in parts by mass: 89.1 parts of tungsten carbide, 10 parts of cobalt, 0.4 parts of vanadium carbide, 0.5 parts of chromium carbide, 2 parts of parts of paraffin, 27 parts of absolute ethanol, and 2 parts of dispersant. Wherein, the dispersing agent includes 30% by mass of fatty alcohol polyoxyethylene ether, 20% by mass of stearic acid and 50% by mass of polyglycerol-6 laurate.

[0071] The mixture of the above components was put into a ball mill for mixing and mixing to obtain a slurry (a planetary ball mill with a specification of 1.5L was used in this experiment, and the supplier of the ball mill was Changsha Tianchuang). Among them, the ratio of ball to material is 6:1, and the ratio of solid to liquid is 300ml / Kg. This time, the loading amount of each can is 600g, and the ball milling time is 78 hours, so as to obtain the first cemen...

Embodiment 2

[0074] The embodiments of the present application provide a method for preparing a nano-hard alloy, which includes the following components in parts by mass: 89.1 parts of tungsten carbide, 10 parts of cobalt, 0.4 parts of vanadium carbide, 0.5 parts of chromium carbide, 2 parts of parts of paraffin, 27 parts of absolute ethanol, and 2 parts of dispersant. Wherein, the dispersing agent includes 35% by mass of fatty alcohol polyoxyethylene ether, 30% by mass of stearic acid and 35% by mass of polyglycerol-6 laurate.

[0075] The mixture of the above components was put into a ball mill for mixing and mixing to obtain a slurry (a planetary ball mill with a specification of 1.5L was used in this experiment, and the supplier of the ball mill was Changsha Tianchuang). Among them, the ratio of ball to material is 6:1, and the ratio of solid to liquid is 300ml / Kg. This time, the loading amount of each can is 600g, and the ball milling time is 78 hours, so as to obtain the first cemen...

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Abstract

The invention provides a preparation method of a nano hard alloy, which comprises the following steps: providing a ball mill, adding powdered tungsten carbide, powdered cobalt, a nucleation inhibitor, absolute ethyl alcohol, a dispersing agent and paraffin into the ball mill, dissolving the dispersing agent in the absolute ethyl alcohol, adding the mixture into the ball mill, and uniformly stirring; the dispersing agent comprises fatty alcohol-polyoxyethylene ether, polyglycerol-6 laurate and stearic acid, and continuously ball-milling to obtain a first nano hard alloy mixture; the first nano hard alloy mixture is dried to remove absolute ethyl alcohol, and a second nano hard alloy mixture is obtained; and the second nano hard alloy mixture is placed in a mold, dewaxing is conducted on the second nano hard alloy mixture to remove the paraffin and the dispersing agent, and then sintering is conducted to obtain the nano hard alloy.

Description

technical field [0001] The present application relates to the field of material chemical industry, and in particular, to a preparation method of nanometer cemented carbide. Background technique [0002] Cemented carbide is an indispensable part of industrial production because of its high hardness and wear resistance, as well as its good heat and corrosion resistance. However, cemented carbide is a brittle material, and its transverse fracture toughness cannot meet the higher requirements while having high hardness. In addition, because of its high strength and hardness, nano cemented carbide is widely used in various fields of modern technology, such as precision molds and special tools, and has great application prospects. [0003] However, the abnormal growth of tungsten carbide occurs during the sintering process of ultra-fine and nano-level cemented carbides, which has a great negative impact on the performance of alloy tools (such as hardness and wear resistance). Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F9/04B22F1/102C22C29/08B22F3/10
CPCC22C1/051B22F9/04B22F1/102C22C29/08C22C29/067B22F3/1021B22F2009/043Y02P10/25
Inventor 项凤鸣成磊边伟鲍亚楠
Owner 晋城鸿智纳米光机电研究院有限公司
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