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Cemented carbide and its preparation method

A technology of cemented carbide and hard phase, which is applied in the field of cemented carbide and its preparation, and can solve problems that need to be improved

Active Publication Date: 2018-09-28
崇义恒毅陶瓷复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, fine-grained hard alloys and their preparation methods still need to be improved.

Method used

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  • Cemented carbide and its preparation method
  • Cemented carbide and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for preparing low-binding-phase fine-grain cemented carbide by rapid pressurized sintering of the present invention comprises the following steps:

[0039] (1) Mix pure WC powder, VC powder, and pure cobalt powder at a ratio of 99.95:0.02:0.03, add pure water (deionized water) into a ball mill and perform ball milling for 50 hours, wherein the particle size of WC powder is 0.4 μm.

[0040] (2) Put the ball-milled mixed powder obtained in step (1) into a spray tower for granulation and drying to obtain spherical particles with a particle size of 0.6 μm.

[0041] (3) Pack the spherical particles prepared in step (2) into a mold made of graphite, and carry out rapid pressure and pressure sintering. The sintering process is: vacuum degree of 10Pa, sintering pressure of 30MPa, sintering temperature of 1450°C, heating rate of 50°C / min, holding at 600°C for 3 minutes in the middle, and holding at 600°C for 6 minutes when reaching the sintering temperature.

[0042] ...

Embodiment 2

[0044] A method for preparing low-binding-phase fine-grain cemented carbide by rapid pressurized sintering of the present invention comprises the following steps:

[0045] (1) Mix pure WC powder, CrC powder, and pure cobalt powder at a ratio of 99.98:0.02:0, add absolute ethanol to a ball mill and perform ball milling for 130 hours, wherein the particle size of the WC powder is 0.6 μm.

[0046] (2) Put the ball-milled mixed powder obtained in step (1) into a spray tower for granulation and drying to obtain spherical particles with a particle size of 1.1 μm.

[0047] (3) Put the spherical particles prepared in step (2) into a mold made of C / C composite material, and perform rapid pressure sintering. The sintering process is as follows: vacuum degree 5Pa, sintering pressure 50MPa, sintering temperature 1900°C, heating rate 120°C / min, heat preservation at 750°C for 5 minutes in the middle, and heat preservation for 10 minutes when reaching the sintering temperature.

[0048] Aft...

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Abstract

The invention discloses a hard alloy and a preparation method thereof. The preparation method comprises the following steps of mixing hard phase powder with a solvent, and performing ball milling treatment so as to obtain a ball milling product; performing drying treatment on the obtained ball milling product; and performing pressure sintering treatment on the ball milling product after the drying treatment to obtain the hard alloy. The preparation method disclosed by the invention is easy to operate and low in cost; and the problems that internal organizations are uneven, and the size of crystal grains is greater than an expected size caused by a situation that in the sintering process, the crystal grains grow can be effectively solved by the prepared hard alloy.

Description

technical field [0001] The invention relates to the field of alloy preparation, in particular, the invention relates to cemented carbide and a preparation method. Background technique [0002] Due to its high density, high hardness, high toughness and good wear resistance, WC-Co cemented carbide is widely used in the fields of machining, wear-resistant materials, petroleum, mining, molds and military armor weapons. Especially when the grain of cemented carbide is refined to submicron or even nanometer level, its hardness and toughness will be greatly improved. [0003] However, fine-grained cemented carbide and its preparation methods still need to be improved. Contents of the invention [0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. [0005] The present invention is based on the following recognition and discovery of the inventors: [0006] At present, the preparation of fine-grained cemented c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/051C22C29/08
Inventor 胡庆黄泽兰陈邦明周煜
Owner 崇义恒毅陶瓷复合材料有限公司
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