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Ultra-fine grain WC/Co/diamond-C2Cr3 hard alloy and hot-press preparation method thereof

A cemented carbide and diamond technology, which is applied in the field of preparing WC/Co/diamond-C2Cr3 cemented carbide, can solve problems such as undiscovered cemented carbide, and achieve good commercial value, low energy consumption, and excellent mechanical properties.

Active Publication Date: 2015-05-20
SHANGHAI GREENSUN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the mechanical properties of microwave reaction sintered WC-Co cemented carbide need to be further improved in order to adapt to the harsh application environment
[0004] By searching existing patents and literature, no hot pressing method was found to prepare WC / Co / diamond-C 2 Cr 3 Carbide report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: (1): at first particle size is that 0.8 micron weight percentage is 90.70% WC powder and particle size is that 0.8 micron weight percentage is that 7.90% Co powder is mixed in the novel ball mill, rotating speed 100 rpm, the time is After 16 hours, add 1.23% diamond powder with a particle size of 0-0.25 micron and 0.17% chromium carbide powder and mix for 8 hours, take it out and dry it.

[0014] (2): Put the dried raw material in a pressure sintering furnace, the sintering furnace is raised to 900°C at a speed of 30-50°C / min, and the pressure is 9Mpa for sintering to obtain ultra-fine grain WC / Co / diamond-Cr 3 C 2 Carbide.

[0015] The measured flexural strength is 600Mpa, the fracture toughness is 15.3, the Vickers hardness is 1925, and the porosity is 99.5%.

Embodiment 2

[0016] Embodiment 2: (1): at first particle size is that 0.8 micron weight percentage is 89.40% WC powder and particle size is that 0.8 micron weight percentage is that 7.78% Co powder is mixed in the novel ball mill, rotating speed 100 rev / mins, the time is After 16 hours, respectively add 2.55% diamond powder with a particle size of 0-0.25 micron and 0.27% chromium carbide powder and mix for 8 hours, take it out and dry it.

[0017] (2): Put the dried raw material in a pressure sintering furnace, the sintering furnace is raised to 900°C at a speed of 30-50°C / min, and the pressure is 9Mpa for sintering to obtain ultra-fine grain WC / Co / diamond-Cr 3 C 2 Carbide.

[0018] The measured flexural strength is 570Mpa, the fracture toughness is 16.8, the Vickers hardness is 2024, and the porosity is 98.6%.

Embodiment 3

[0019] Embodiment 3: ((1): at first particle size is that 0.8 micron weight percentage is 87.44% WC powder and particle size is that 0.8 micron weight percentage is that 9.72% Co powder is packed in novel ball mill and mixes, and rotating speed 100 rev / mins, time After 16 hours, respectively add 2.58% diamond powder with a particle size of 0-0.25 micron and 0.26% chromium carbide powder and mix for 8 hours, take it out and dry it.

[0020] (2): Put the dried raw material in a pressure sintering furnace, the sintering furnace is raised to 900°C at a speed of 30-50°C / min, and the pressure is 9Mpa for sintering to obtain ultra-fine grain WC / Co / diamond-Cr 3 C 2 Carbide.

[0021] The measured flexural strength is 300Mpa, the fracture toughness is 6.2, the Vickers hardness is 662, and the porosity is 92.0%.

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Abstract

The invention discloses a gas-pressure-sintering ultra-fine grain WC / Co / diamond-C2Cr3 hard alloy. The hard alloy is prepared from the following components by granularity and weight percentage: 0.8-micron (90.70, 89.40 and 87.44) percent of WC powder, 0.8-micron (7.90, 7.78 and 9.72) percent of Co powder, 0.25-micron (1.23, 2.55 and 2.58) percent of diamond powder and (0.17, 0.27 and 0.26) percent of chromium carbide. The preparation method comprises the following steps: (1) mixing WC powder and Co powder at a rotating speed of 100 revolutions / minute for 16 hours by using anhydrous ethanol as a dispersive medium, respectively adding the diamond powder and the chromium carbide to mix for 8 hours, and taking out and baking; and (2) putting the dried raw materials in an air pressure sintering furnace, heating to 900 DEG C at a speed of 30-50 DEG C / min, and sintering at a pressure of 9Mpa. The method is low in sintering temperature and low in energy consumption and can be used for sintering complicated samples, and the hard alloy has excellent mechanical performance and is suitable for volume production.

Description

technical field [0001] The invention relates to a method for preparing cemented carbide, in particular to a method for preparing WC / Co / diamond-C 2 Cr 3 Carbide method. Background technique [0002] WC / Co-based cemented carbide has high strength and hardness, good red hardness and wear resistance, and is widely used in the fields of machining, mining, molds and wear-resistant parts. In recent years, with the continuous development of the cemented carbide industry, the research and development of new nano and ultrafine cemented carbide materials with high hardness, high toughness and high strength has become a research hotspot in the field of materials science and engineering. However, there is an "irreconcilable contradiction" in the cemented carbide material, that is, the hardness and toughness of the material cannot be satisfied at the same time. Diamond belongs to the co-construction valence structure, has a very high melting point, and the hardness is the highest in na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 李坤陈海龑何秋爽董丽华
Owner SHANGHAI GREENSUN ENVIRONMENTAL PROTECTION TECH CO LTD
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