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Method for preparing tungsten carbide ceramic material

A ceramic material and tungsten carbide technology, which is applied in the field of preparation of tungsten carbide ceramic materials, can solve the problems of high production cost and complicated process, and achieve the effects of high density, uniform structure distribution and fine grain size.

Inactive Publication Date: 2017-12-29
张家港市华舰五金工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strict requirements on the chemical purity and physical properties of tungsten carbide powder, the process of preparing tungsten carbide powder is very complicated. The production of tungsten carbide from black tungsten concentrate or scheelite concentrate usually requires the production of ammonium paratungstate and tungsten powder. Tungsten carbide produced by many processes such as preparation and carbonization, the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Preparation method of fully dense tungsten carbide ceramic material

[0013] (1), hot pressing sintering

[0014] Put the tungsten carbide powder into the graphite mold, apply 17MPa pressure to cold press first, then remove the pressure, and start to heat up when the vacuum degree is less than 10Pa. Heating to 1600°C, then heating to 2000°C at 3°C / min, keeping the pressure at 30MPa for 30 minutes, and cooling to 1000°C at a rate of 10°C / min.

[0015] After hot pressing and sintering, the relative density of the material is 97.5%, the hardness is 25.6GPa, and the fracture toughness is 4.8MPa m 1 / 2 .

[0016] (2), using the hot isostatic pressing process to carry out hot isostatic pressing post-treatment on the materials after hot pressing and sintering

[0017] The sintering temperature is 1750°C, the sintering pressure is controlled at 150MPa and kept for 2 hours.

[0018] After static pressure post-treatment, the relative density of the material is increased to 99%...

Embodiment 2

[0020] Preparation method of fully dense tungsten carbide ceramic material

[0021] (1), hot pressing sintering

[0022] Put the tungsten carbide powder into the graphite mold, apply 17MPa pressure to cold press first, then remove the pressure, and start to heat up when the vacuum degree is less than 10Pa. Heating to 1500°C, then heating to 1900°C at 3°C / min, keeping the pressure at 30MPa for 30 minutes, cooling to 1000°C at a rate of 10°C / min.

[0023] After hot pressing and sintering, the relative density of the material is 96.8%, the hardness is 24.2GPa, and the fracture toughness is 4.78MPa m 1 / 2 .

[0024] (2), using the hot isostatic pressing process to carry out hot isostatic pressing post-treatment on the materials after hot pressing and sintering

[0025] The sintering temperature is 1800°C, the sintering pressure is controlled at 150MPa and kept for 2 hours.

[0026] After static pressure post-treatment, the relative density of the material is increased to 99%. ...

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Abstract

The invention discloses a method for preparing a tungsten carbide ceramic material, wherein the method comprises the steps: putting a tungsten carbide powder into a graphite mold, firstly, applying the pressure of 17-20 MPa and carrying out cold compression, then removing the pressure, starting to heat up when the vacuum degree is less than 10 Pa, heating up to 1900-2000 DEG C, controlling the pressure to be 25-30 MPa and keeping for 25-30 minutes, and cooling to 800-1000 DEG C. The method can obtain a binder-free tungsten carbide hard alloy having the advantages of high density, fine crystal grains and uniform distribution of microstructure.

Description

technical field [0001] The present application relates to a preparation method of tungsten carbide ceramic material. Background technique [0002] Tungsten carbide has the characteristics of high melting point, high hardness, high toughness, wear resistance, high thermal conductivity, etc. It is widely used in the field of tool materials, and tungsten carbides show extremely high catalytic activity, which is expected to replace precious metal catalysts. Therefore, related research a lot of. Due to the strict requirements on the chemical purity and physical properties of tungsten carbide powder, the process of preparing tungsten carbide powder is very complicated. The production of tungsten carbide from black tungsten concentrate or scheelite concentrate usually requires the production of ammonium paratungstate and tungsten powder. Tungsten carbide produced by many processes such as preparation and carbonization has high production costs. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/645
CPCC04B35/5626C04B35/645C04B2235/77C04B2235/96
Inventor 范思远
Owner 张家港市华舰五金工具有限公司
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