Preparation method for ultra-coarse tungsten carbide hard alloy containing trace cobalt

A technology of cemented carbide and tungsten carbide, which is applied in the field of high-hardness cemented carbide and high-strength preparation. It can solve the problems of fracture toughness and hardness contradiction, achieve uniform composition, improve comprehensive performance, and increase density.

Active Publication Date: 2019-08-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of conflicting fracture toughness and hardness of existing tungsten carbide cemented carbide, the present invention provides a preparation method of ultra-coarse tungsten carbide cemented carbide containing a small amount of cobalt, aiming to obtain high fracture toughness and high strength at the same time Ultra-coarse-grained tungsten carbide composites

Method used

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  • Preparation method for ultra-coarse tungsten carbide hard alloy containing trace cobalt
  • Preparation method for ultra-coarse tungsten carbide hard alloy containing trace cobalt

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The ultra-coarse WC cemented carbide composite material of the present embodiment is carried out as follows:

[0031] 1. Select WC powder with a particle size of 20 μm, nano WC-6Co composite powder with a grain size ≤ 200 nm, and cobalt powder with an average particle size of 3 μm. According to the composition of the required WC cemented carbide, weigh coarse-grained WC powder and nano-WC-6Co composite powder, the mass ratio of the two is 3:1, and add 4wt% Co, and use a mixer to mix mechanically for 2 hours to obtain a mixed Uniform cemented carbide mixture powder; according to the required product size, weigh a certain amount of composite powder;

[0032] 2. Fill the cemented carbide mixture powder weighed in step 1 into the graphite mold covered with graphite paper; use a manual hydraulic press to pre-press the graphite mold filled with the composite powder, and the pressure is ~10MPa;

[0033] 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold fill...

Embodiment 2

[0040] The ultra-coarse WC cemented carbide composite material of the present embodiment is carried out as follows:

[0041] 1. Select WC powder with a particle size of 20 μm, nano WC-6Co composite powder with a grain size ≤ 200 nm, and cobalt powder with an average particle size of 3 μm. According to the composition of the required WC cemented carbide, weigh coarse-grained WC powder and nano-WC-6Co composite powder, the mass ratio of the two is 3:1, and add 4wt% Co, and use a mixer to mix mechanically for 2 hours to obtain a mixed Uniform cemented carbide mixture powder; according to the required product size, weigh a certain amount of composite powder;

[0042] 2. Fill the cemented carbide mixture powder weighed in step 1 into the graphite mold covered with graphite paper; use a manual hydraulic press to pre-press the graphite mold filled with the composite powder, and the pressure is ~10MPa;

[0043] 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold fill...

Embodiment 3

[0050] The ultra-coarse WC cemented carbide composite material of the present embodiment is carried out as follows:

[0051] 1. Select WC powder with a particle size of 20 μm, nano WC-6Co composite powder with a grain size ≤ 200 nm, and cobalt powder with an average particle size of 3 μm. According to the composition of the required WC cemented carbide, weigh coarse-grained WC powder and nano-WC-6Co composite powder, the mass ratio of the two is 3:1, and add 4wt% Co, and use a mixer to mix mechanically for 2 hours to obtain a mixed Uniform cemented carbide mixture powder; according to the required product size, weigh a certain amount of composite powder;

[0052] 2. Fill the cemented carbide mixture powder weighed in step 1 into the graphite mold covered with graphite paper; use a manual hydraulic press to pre-press the graphite mold filled with the composite powder, and the pressure is ~10MPa;

[0053] 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold fill...

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Abstract

The invention discloses a preparation method for an ultra-coarse tungsten carbide hard alloy containing trace cobalt; WC powder and nano WC-6Co composite powder are used as raw materials, and the trace cobalt is added; and the ultra-coarse grain hard alloy is prepared by mixing, prepressing and spark plasma sintering. The invention relates to a method for preparing an ultra-coarse hard alloy by ashort process; the prepared WC has a uniform grain size, which reaches 30 microns; and the alloy has high strength and hardness, good density and high fracture toughness.

Description

technical field [0001] The invention relates to a preparation method of ultra-coarse tungsten carbide cemented carbide containing a trace amount of cobalt. Ultra-coarse WC cemented carbide and nano WC-6Co composite powder are used as raw materials, and metal Co powder is added to prepare high-strength, high-hardness hard alloy. alloy method. The high-performance cemented carbide prepared by this method can be processed into drill bits, milling cutters or wear-resistant abrasive tools. Background technique [0002] Cemented carbide materials have excellent properties such as high hardness, high strength, and high elastic modulus, and are widely used in various cutting tools, mining tools and wear-resistant parts. However, it is difficult for high hardness and high fracture toughness of cemented carbide to coexist. Hardness and toughness are contradictory bodies in cemented carbide. Some scholars believe that through the method of matching the thickness of tungsten carbide i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 张久兴金亚琴胡梦圆潘亚飞
Owner HEFEI UNIV OF TECH
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