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Super-wear-resistant tungsten carbide hard alloy discharge plasma sintering method

A discharge plasma and cemented carbide technology, which is applied in the field of cemented carbide powder sintering, can solve the problems of reducing the hardness of WC, and achieve the effect of superior performance.

Inactive Publication Date: 2018-07-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a super wear-resistant tungsten carbide cemented carbide discharge plasma sintering method to solve the problem in the prior art that the hardness of WC gradually decreases with the increase of Co content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Ingredients: prepare WC powder with CaC2 content of 2w% and Co content of 1w%. Put 48.5g of nano-WC powder, 1.00g of CaC2 and 0.50g of Co powder into a ball mill, add an appropriate amount of alcohol, set the speed at 600rad / min, take out the slurry after 48 hours and put it in an oven, bake at 90°C for 24 hours, and pass through a 100-mesh sieve network.

[0019] (2) Firing: Take an appropriate amount of the above-mentioned dried powder and put it into a graphite mold with an internal diameter of 20mm for compaction, and place it together with the mold between the upper and lower electrodes of the SPS device. The temperature is raised to 800°C at a rate of 300°C / min, then to 1400°C at a rate of 300°C / min, and finally to a sintering temperature of 1700°C at a rate of 100°C / min. The sample is taken out.

[0020] (3) Cleaning: grinding and cleaning the products after they are released from the furnace to remove carbon paper slag on the surface to obtain finished pro...

Embodiment 2

[0023] (1) Ingredients: prepare WC powder with CaC2 content of 1.5w%, and Co content of 1.5w%. Put 48.50g of nano-WC powder, 0.75g of CaC2 and 0.75g of Co powder into a ball mill, add an appropriate amount of alcohol, set the speed at 600rad / min, take out the slurry after 48 hours, put it in an oven, bake at 90°C for 24 hours, and pass through a 100-mesh sieve network.

[0024] (2) Firing: Take an appropriate amount of the above-mentioned dried powder and put it into a graphite mold with an internal diameter of 20mm for compaction, and place it together with the mold between the upper and lower electrodes of the SPS device. The temperature is raised to 800°C at a rate of 300°C / min, then to 1400°C at a rate of 300°C / min, and finally to a sintering temperature of 1600°C at a rate of 100°C / min. The sample is taken out.

[0025] (3) Cleaning: grinding and cleaning the products after they are released from the furnace to remove carbon paper slag on the surface to obtain finished ...

Embodiment 3

[0028] (1) Ingredients: prepare WC powder with CaC2 content of 1w% and Co content of 2w%. Put 48.50g of nano-WC powder, 0.50g of CaC2 and 1.00g of Co powder into a ball mill, add an appropriate amount of alcohol, set the speed at 600rad / min, take out the slurry after 48 hours and put it in an oven, bake at 90°C for 24 hours, and pass through a 100-mesh sieve network.

[0029] (2) Firing: Take an appropriate amount of the above-mentioned dried powder and put it into a graphite mold with an internal diameter of 20mm for compaction, and place it together with the mold between the upper and lower electrodes of the SPS device. The temperature is raised to 800°C at a rate of 300°C / min, then to 1400°C at a rate of 300°C / min, and finally to a sintering temperature of 1500°C at a rate of 100°C / min. The sample is taken out.

[0030] (3) Cleaning: grinding and cleaning the products after they are released from the furnace to remove carbon paper slag on the surface to obtain finished pr...

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Abstract

The invention discloses a super-wear-resistant tungsten carbide hard alloy discharge plasma sintering method. The method comprises the following steps: adding Co powder with the purity of 99.9 percentand the granularity of 20 to 30 nm and CaC2 powder with the purity of 99.9 pecent and the granularity of 40 to 50 nm into binding phase-free nano WC powder which is protected by vacuum or inert gas and is used as a raw material; putting the mixture into a high-intensity graphite mold for compaction, and placing the mixture between an upper electrode and a lower electrode of an SPS discharge plasma sintering device; vacuumizing the die till the vacuum degree is 6 Pa, increasing uniaxial pressure to 50 MPa within a tolerance range of the graphite mold, then heating the graphite mold, and preserving the heat for 5 min to obtain a phase-free nano tungsten carbide hard alloy. According to the preparation method disclosed by the invention, a tungsten carbide material is sintered by adopting anSPS technology; the adding amount of Co is maintained at the content close to the content of 1 percent during low-Co sintering; furthermore, CaC2 is added into a sintering aid, so that the shortcomingthat the hardness of WC is gradually reduced with the increase of the Co content; furthermore, the content of Co is more than 1 percent, so that the phase-free nano tungsten carbide hard alloy has the advantage of toughness during cobalt sintering.

Description

technical field [0001] The invention belongs to the field of cemented carbide powder sintering, and relates to a sintering process of tungsten carbide, in particular to a super wear-resistant tungsten carbide cemented carbide discharge plasma sintering method. Background technique [0002] Tungsten carbide is a high-hard ceramic material, hard and brittle, except for grinding materials, tungsten carbide is rarely used directly. Because the hardness of tungsten carbide is second only to diamond, ceramics, gemstones and cubic boron nitride, it has good wear resistance. It is an important hard surface material that provides wear resistance for tools and devices or components subjected to strong forces. It can be made into Improve the wear resistance of components by ten times or dozens of times, or even hundreds of times. WC-Co series cemented carbide has been paid more and more attention. Co is a commonly used binder phase in the sintering process, and the increase of its co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
CPCC04B35/5626C04B35/622C04B35/645C04B2235/3817C04B2235/40C04B2235/5454C04B2235/666C04B2235/77C04B2235/96
Inventor 马认琦鞠少栋徐鸿飞邢洪宪王超王世强
Owner CHINA NAT OFFSHORE OIL CORP
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