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Hard alloy, and preparation method and application thereof

A cemented carbide and hardness technology, applied in the field of cemented carbide, can solve the problems that the material cannot produce uniform and deepening effect, the experimental data is difficult to be accurate, and the smooth progress of ball milling is hindered, so as to achieve low pressing pressure, uniform structure, The effect of uniform mixture

Active Publication Date: 2014-04-09
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems such as dead ends at the bottom of the tank, which cannot be fundamentally resolved
The above problems are technical problems that affect the effect of ball milling or even hinder the smooth progress of ball milling, which will make the material unable to produce a uniform and deepening effect during the alloying process, the experimental data is difficult to be accurate, and the stability of the process is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] WC / Co composite powder containing 6% cobalt is selected as the raw material, dispersant stearic acid, molding agent polyethylene glycol and alcohol medium are added, the grinding body is cemented carbide, the ball-to-material ratio is 5.2:1, and the carbon balance calculated by the ingredients The value is +0.09%, start the stirring rod to stir at low speed to form a slurry, start the circulating pump to form a circulating stirring ball mill.

[0042] The formula Y=aX+b (Y is the slurry flow rate, X is the compressed air pressure, and a and b are the characteristic value constants of the composite powder) of the circulation pump pressure and the slurry flow rate is obtained through the following experiments:

[0043] The specific gravity of the above-mentioned slurry was measured in the laboratory as 2.5kg / L, and the pressure of the circulating pump was set to 0.05, 0.08, 0.1, 0.12, 0.15Mpa respectively, and the time and weight of the above-mentioned slurry in the grindi...

Embodiment 2

[0046] WC / Co composite powder containing 8.5% cobalt is selected as raw material, and dispersant stearic acid, molding agent polyethylene glycol and alcohol medium are added. The grinding body is cemented carbide, the ball-to-material ratio is 5.5:1, and the carbon balance calculated by the ingredients The value is +0.09%, start the stirring rod to stir at low speed to form a slurry, start the circulating pump, the compressed air pressure of the circulating pump is 0.13Mpa, and form a circulating stirring ball mill. According to the formula Y=aX+b (Y is the flow rate of the slurry, X is the compressed air pressure, a and b are the characteristic value constants of the composite powder, see Table 1 for the specific values) according to the formula Y=aX+b of the pressure of the circulating pump and the flow rate of the slurry invented. The slurry flow rate was controlled at 26L / min. The ball milling time was 14.5 hours to prepare the mixture, which was pressed, dewaxed, and sint...

Embodiment 3

[0048] Choose WC / Co composite powder containing 10% cobalt as raw material, add dispersant stearic acid, molding agent polyethylene glycol and alcohol medium, the grinding body is hard alloy, the ratio of ball to material is 6.5:1, and the carbon balance calculated by the ingredients The value is +0.07%, start the stirring bar to stir at low speed to form a slurry, start the circulating pump, the compressed air pressure of the circulating pump is 0.11Mpa, and form a circulating stirring ball mill. According to the formula Y=aX+b (Y is the flow rate of the slurry, X is the compressed air pressure, a and b are the characteristic value constants of the composite powder, see Table 1 for the specific values) according to the formula Y=aX+b of the pressure of the circulating pump and the flow rate of the slurry invented. The slurry flow rate was controlled at 24L / min. The ball milling time was 16 hours to prepare the mixture, which was pressed, dewaxed, and sintered at 1430° C. for ...

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Abstract

The invention provides a hard alloy which comprises 6.0-13.2 wt% of cobalt and 86.3-93.5 wt% of tungsten carbide (WC). The average grain size of the hard alloy is 0.6-1.0 mu m, the structure is uniform, the hardness is HRA91.5-93.0, the bending strength is 3000-4500 MPa, and the fracture toughness value is 9-15 Mpam<1 / 2>. The invention also provides a preparation method of the hard alloy, which comprises the following steps: carrying out ball milling on the raw material WC / Co composite powder for 13-20 hours while stirring to obtain a mixture, pressing, dewaxing and sintering under low pressure. The invention also provides application of the hard alloy in the field of high-pressure and wear-resistant parts, preferably application in the field of synthesis of artificial diamonds.

Description

technical field [0001] The invention relates to a cemented carbide, a preparation method and an application thereof. Background technique [0002] Fine-grained, ultra-fine cemented carbide has become an ideal material for high-efficiency precision tools and other fields requiring wear resistance and stability due to its excellent properties of high hardness and high strength. With the promotion of application fields, in addition to good wear resistance, the requirements for rigidity and toughness are also getting higher and higher. The preparation method of fine-grained alloys is usually: add Co and inhibitors with 0.6-1.0 μm fine-grained WC, prepare the mixture by rolling ball milling, drying, pressing, dewaxing and sintering. After 100 hours, WC has high activity and many defects, and the grain size of WC and Co cannot reach the micron-level sufficient uniformity, which may easily cause uneven structure or even cobalt pools, which will reduce the performance of use. Poor...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05B01J3/06
Inventor 彭文卿林李重渐龚南雁吴志坚金鹏孔德方
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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