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In-situ synthetic method for WC-Co hard alloy

A cemented carbide and in-situ synthesis technology, applied in the field of reaction sintering, to achieve the effects of reducing cost and energy consumption, purifying the surface of particles, and being easy to operate

Inactive Publication Date: 2006-03-22
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of WC-Co cemented carbide by spark plasma sintering method has not been reported at home and abroad.

Method used

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  • In-situ synthetic method for WC-Co hard alloy
  • In-situ synthetic method for WC-Co hard alloy
  • In-situ synthetic method for WC-Co hard alloy

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Embodiment Construction

[0013] 1. 78.0% by weight of WO 3 With 13.0% by weight carbon black and 8.0% by weight Co 3 o 4 Add absolute ethanol to the powder, put it into a high-energy ball mill for powder mixing and ball milling for 20 hours, bake at 120°C for 1 hour, pass through a -120 mesh sieve, put the mixed powder into a φ20 graphite mold, and press it tightly. Then put it into SPS for sintering, evacuate to 3~4Pa, add 10MPa pressure in advance, and heat up rapidly at 100°C / min. to 30MPa, after the vacuum degree returns to 3-4Pa, the temperature is raised at 70°C / min to 1200°C for 2 minutes, then cooled slowly to room temperature and taken out to obtain WC-Co cemented carbide material. The sintered body is not delaminated ( figure 1 ), XRD analysis showed WC and Co phases ( figure 2 ).

[0014] 2. 80.0% by weight of WO 3 With 15.0% by weight carbon black and 5.0% by weight Co 3 o 4 Add absolute ethanol to the powder, put it into a high-energy ball mill for powder mixing and ball milling ...

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Abstract

The present invention belongs to the field of reaction sintering technology. The in-situ synthesis process of hard WC-Co alloy includes the following steps: ball milling the mixture of WO3 in 78-80 wt%, Co3O4 in 5-8 wt% and carbon black in 13-15 wt% with absolute ethanol as protecting medium; stoving and 120 mesh sieving; setting the mixture powder inside mold and sintering in discharging plasma sintering plant; vacuum pumping to 3-4 Pa, applying pressure of 10-15 MPa, raising temperature in 100-120 deg.c / min to 1000-1100 deg.c, maintaining the temperature, raising vacuum degree while increasing the pressure to 30-50 MPa, restoring vacuum degree to 3-4 Pa, raising the temperature in 70-80 deg.c / min to 1200-1300 deg.c, and maintaining for 2-3 before lowering temperature. The process is simple, low in power consumption and low in cost and has hard alloy product with the same structure and component as that obtained in traditional method.

Description

technical field [0001] The invention relates to an in-situ synthesis method of spark plasma reaction sintering WC-Co cemented carbide, which belongs to the technical field of reaction sintering. Background technique [0002] WC-Co cemented carbide is an important material with a large quantity and a wide range in my country. The traditional cemented carbide production process mainly includes WO 3 Preparation of W powder by hydrogen reduction, high-temperature carbonization of W powder to form WC powder, ball milling of WC and Co powder, pressing, sintering and other steps, the process is long and consumes a lot of energy and water resources. It is reported that cemented carbide is prepared by self-propagating (SHS) high temperature synthesis method, but there are problems of low purity of components and poor performance. Spark plasma sintering (SPS) is an energy-saving and environmentally friendly material preparation technology, which has a series of advantages such as sh...

Claims

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Application Information

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IPC IPC(8): C22C1/04
Inventor 张久兴王澈张国珍宋晓艳周美玲
Owner BEIJING UNIV OF TECH
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