Prepn process of high-performance superfine crystal hard WC-10 wt.% Co alloy

A technology of wc-10wt.%co, cemented carbide, applied in the field of powder metallurgy

Inactive Publication Date: 2007-01-03
BEIJING UNIV OF TECH
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  • Prepn process of high-performance superfine crystal hard WC-10 wt.% Co alloy
  • Prepn process of high-performance superfine crystal hard WC-10 wt.% Co alloy
  • Prepn process of high-performance superfine crystal hard WC-10 wt.% Co alloy

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example 1

[0016] Example 1. Firstly, Co powder is ball-milled, the ball-to-material ratio is 10:1, the ball-milling speed is 500r / min, the ball-milling time is 20 hours, and argon is used for protection. A Co powder with an average particle size of 16 μm and a nanocrystalline microstructure (e.g. figure 1 with figure 2 ). Then, the 0.2 micron WC powder and the Co powder after ball milling were mixed and ball milled at a mass ratio of 9:1, the ball to material ratio was 3:1, the ball milling speed was 300r / min, the ball milling time was 24 hours, and the ball milling medium was absolute ethanol . The mixed powder after ball milling was dried in a vacuum oven at a set temperature of 100°C for 24 hours to obtain a starting powder for sintering (such as image 3 ). Put this powder into graphite mold and press molding. into the vacuum sintering chamber of the SPS system. The sintering process parameters are: sintering temperature 1120°C; sintering heating rate 120°C / min; no pressure i...

example 2

[0017] Example 2. Firstly, the Co powder is ball milled, the ball-to-material ratio is 10:1, the ball milling speed is 600r / min, the ball milling time is 16 hours, and argon gas protection is used. A Co powder with an average particle size of 22 microns and a nanocrystalline microstructure was obtained. Then, the 0.2 micron WC powder and the Co powder after ball milling were mixed and ball milled at a mass ratio of 9:1, the ball to material ratio was 3:1, the ball milling speed was 400r / min, the ball milling time was 20 hours, and the ball milling medium was absolute ethanol . The mixed powder after ball milling was dried in a vacuum oven with a set temperature of 100° C. for 24 hours to obtain the starting powder for sintering. Put this powder into graphite mold and press molding. into the vacuum sintering chamber of the SPS system. The sintering process parameters are: sintering temperature 1150°C; sintering heating rate 100°C / min; no pressure is applied at the beginning ...

example 3

[0018] Example 3. First, the Co powder is ball-milled, the ball-to-material ratio is 10:1, the ball-milling speed is 500r / min, the ball-milling time is 24 hours, and argon is used for protection. A Co powder with an average particle size of 14 microns and a nanocrystalline microstructure was obtained. Then, the 0.2 micron WC powder and the Co powder after ball milling were mixed and ball milled at a mass ratio of 9:1, the ball to material ratio was 3:1, the ball milling speed was 300r / min, the ball milling time was 24 hours, and the ball milling medium was absolute ethanol . The mixed powder after ball milling was dried in a vacuum oven with a set temperature of 100° C. for 24 hours to obtain the starting powder for sintering. Put this powder into graphite mold and press molding. into the vacuum sintering chamber of the SPS system. The sintering process parameters are: sintering temperature 1150°C; sintering heating rate of about 80°C / min; no pressure is applied at the begi...

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Abstract

The preparation process of high performance superfine crystalline hard WC-10wt%Co alloy belongs to the field of powder metallurgy technology. The preparation process includes the following steps: ball milling pure Co powder of 30-60 micron size under Ar protection for over 16 hr to obtain micron level Co powder with nanometer crystal structure; mixing 0.2 micron size WC powder and the Co powder in the weight ratio of 9, ball milling the mixture in anhydrous ethanol for 20-24, vacuum drying to obtain mixture powder, filling into mold and cold pressing to form; and sintering in a discharging plasma sintering apparatus. The technological process is simple, and prepared WC-10wt%Co alloy has high performance.

Description

technical field [0001] The invention discloses a preparation method of a high-performance ultrafine grain WC-Co cemented carbide material, which belongs to the technical field of powder metallurgy. Background technique [0002] The hardness and toughness of traditional coarse-grained WC-Co cemented carbide materials have always been a pair of mutually restrictive contradictions. In recent years, studies have found that when the WC grain size is reduced below 0.5 μm, the hardness and fracture toughness of cemented carbide materials can maintain high values ​​at the same time. In the existing preparation methods of cemented carbide materials, such as improved hot isostatic pressing sintering, ultra-high pressure sintering and rapid hot isostatic pressing sintering for the shortcomings of traditional hot pressing sintering, although the sintering process has been reduced to a certain extent The temperature and the sintering time are shortened, but usually it still needs to be ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
Inventor 宋晓艳张久兴赵世贤刘雪梅
Owner BEIJING UNIV OF TECH
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