Industrialized preparation method of WC-Co hard alloy with low cost and high performance

A cemented carbide, high-performance technology, applied in the field of cemented carbide and powder metallurgy, can solve the problems of limited material quantity, high price, and inability to promote, and achieve the effects of saving resources, shortening the cycle, and simplifying production equipment and process routes

Active Publication Date: 2010-01-13
北硬科技香河有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the current production equipment, these new sintering equipment are quite expensive, and the amount of materials prepared at one time is very limited, so the sintering process developed for this type of equipment can only be applied in the laboratory, but cannot be extended to practice. In industrial production

Method used

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  • Industrialized preparation method of WC-Co hard alloy with low cost and high performance
  • Industrialized preparation method of WC-Co hard alloy with low cost and high performance
  • Industrialized preparation method of WC-Co hard alloy with low cost and high performance

Examples

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example 1

[0022] The final product is WC-6wt.%Co(YG6) cemented carbide bulk material. Take WO 2.9 , Co 3 O 4 And carbon black powder as raw materials, according to the requirements of the Co content in YG6 cemented carbide, the weight ratio of WO is 110.9:8.2:24.2 2.9 , Co 3 O 4 It is mixed with carbon black and ball milled, and the powder after ball milling is cold pressed and sent to a vacuum furnace with a vacuum gas pressure less than 0.004Pa. The WC-Co composite powder was prepared in a vacuum furnace with the following process parameters: the heating rate was 30 / ℃ min, the holding temperature was 1050℃, and the holding time was 3 hours. The microstructure of the WC-Co composite powder prepared by the above process is shown in figure 1 , The average particle size is about 210 nanometers. The WC-Co composite powder prepared above is directly ball milled without adding a grain growth inhibitor, using anhydrous ethanol as the grinding medium, the volume ratio of material to liquid is 1...

example 2

[0024] The final product is WC-10wt.%Co(YG10) cemented carbide bulk material. Take WO 2.9 , Co 3 O 4 And carbon black powder as raw materials, according to the requirement of Co content in YG10 cemented carbide, according to the mass ratio of 106.2:13.6:23.3 WO 2.9 , Co 3 O 4 It is mixed with carbon black and ball milled, and the powder after ball milling is cold pressed and sent into a vacuum furnace with a vacuum gas pressure of less than 0.001 Pa. The WC-Co composite powder was prepared in a vacuum furnace using the following process parameters: the heating rate was 20°C / min, the holding temperature was 1100°C, and the holding time was 3.5 hours. Add 0.4wt.%VC+0.4wt.%Cr to the WC-Co composite powder prepared above 3 C 2 The mixed powder is then ball milled with absolute ethanol as the grinding medium, the volume ratio of material to liquid is 1:2, the mass ratio of ball to material is 3:1, the speed of the ball mill is 200r / min, and the ball mill The time is 30 hours, 6 hour...

example 3

[0026] The final product is WC-12wt.%Co(YG12) cemented carbide bulk material. Take WO 2.9 , Co 3 O 4 And carbon black powder as raw materials, according to the requirements of the Co content in YG12 cemented carbide, the WO will be combined with a mass ratio of 103.8:16.3:22.8 2.9 , Co 3 O 4 It is mixed with carbon black and ball milled, and the powder after ball milling is cold pressed and sent to a vacuum furnace with a vacuum gas pressure less than 0.0004Pa. The WC-Co composite powder was prepared in a vacuum furnace with the following process parameters: the heating rate was 15 / ℃ min, the holding temperature was 1150℃, and the holding time was 3 hours. Add 1.0wt.% VC crystal growth inhibitor to the WC-Co composite powder prepared above, and then ball mill the mixed powder with absolute ethanol as the grinding medium. The volume ratio of material to liquid is 1:3. The material mass ratio is 1:1, the ball mill speed is 100r / min, the ball milling time is 50 hours, and the form...

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Abstract

The invention relates to an industrialized preparation method of a WC-Co hard alloy with low cost and high performance, which belongs to the technical field of hard alloys and powder metallurgy. The method comprises the following steps: taking WO2.9, Co3O4 and carbon soot as raw materials, and computing the usage ratio of the three materials according to the requirement of the Co content in a final hard alloy block material; adding 0-1.0 percent by weight of grain growth inhibitor into the prepared WC-Co composite powder, and adding polyethylene glycol as a forming agent into a ball milling tank 4-8 hours before ball milling is finished, wherein 30-80ml of polyethylene glycol is added into the powder material per kilogram; acquiring WC-Co mixed powder with a nanocrystal structure after ball milling, and putting the mixed powder into a mould for press forming after vacuum drying; and sintering the mixed powder stock after press forming in a mode of vacuum sintering or low-pressure sintering. The industrialized preparation method markedly shortens a production period, the provided integrated preparation course markedly reduces the production cost while ensuring the high performance of the hard alloy and has a high performance-price ratio, and the preparation method is suitable for industrialized scale production.

Description

Technical field [0001] The invention relates to an industrialized preparation method of WC-Co cemented carbide with low cost and high performance, belonging to the technical field of cemented carbide and powder metallurgy. Background technique [0002] WC-Co cemented carbide is widely used in cutting tools, molds, mining tools and wear-resistant parts due to its unique properties such as high hardness, wear resistance, bending strength and good fracture toughness. It is generally believed that the key technology for preparing high-performance cemented carbide is the preparation of WC and Co mixed powder and its sintering and densification. At present, the basic route for preparing cemented carbide materials is to prepare WC powder and Co powder separately, then mix them uniformly by ball milling, and finally sinter and densify to obtain cemented carbide bulk materials. [0003] The first step in the preparation of cemented carbide is the preparation of high-quality WC and Co raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 宋晓艳魏崇斌赵世贤
Owner 北硬科技香河有限公司
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