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A kind of surface layer decarburization phase gradient cemented carbide material and preparation method thereof

A hard alloy and decarburization technology, applied in the field of hard alloy wear-resistant materials, can solve the problems of long cycle time and complicated preparation process, and achieve the effect of easy process control, simple preparation process and expanded application range

Active Publication Date: 2022-05-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is mainly aimed at WC-Co cemented carbide, and requires two-step sintering and infiltration of ammonium metatungstate solution between the two-step sintering, the preparation process is complicated and the cycle is long.

Method used

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  • A kind of surface layer decarburization phase gradient cemented carbide material and preparation method thereof
  • A kind of surface layer decarburization phase gradient cemented carbide material and preparation method thereof
  • A kind of surface layer decarburization phase gradient cemented carbide material and preparation method thereof

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preparation example Construction

[0042] A second aspect of the present invention provides a method for preparing a surface decarburized cemented carbide material, preferably a method for preparing the surface decarburized cemented carbide material described in the first aspect of the present invention, the method comprising the following steps:

[0043] Step 1. Mix binder, (W,Ti)C powder, WC powder, W powder, carbonitride or nitride.

[0044] According to the present invention, in step 1, the binder, (W,Ti)C powder, WC powder, W powder, carbonitride or nitride are as described in the first aspect of the present invention.

[0045] Step 2, grinding and drying the mixture obtained in step 1, and pressing it into a green body.

[0046] According to the present invention, in step 2, the mixture obtained in step 1 is ground, preferably by using common grinding equipment in the field, such as a ball mill.

[0047] According to the present invention, in step 2, a ball mill is used for grinding, and the grinding bal...

Embodiment 1

[0100] Take the raw material by weight percentage to prepare the surface layer decarburization phase gradient cemented carbide, wherein the Co powder with an average particle size of 1.1 μm accounts for 10%, and the Ti(C) powder with a particle size of 3.0 μm 0.5 ,N 0.5 ) powder accounted for 3.9%, particle size of 2.3μm (Ti 0.42 ,W 0.58 ) C powder accounts for 17.3%, WC powder with a particle size of 6.4 μm accounts for 58%, and the remaining W powder with a particle size of 1.1 μm, the sum of the proportions of each component is 100%;

[0101] Co powder, Ti(C 0.5 ,N 0.5 ) powder, (Ti 0.42 ,W 0.58 ) C powder, WC powder, and W powder are added to the drum ball mill for grinding. The grinding ball is Φ6mm WC-8wt% Co cemented carbide ball, the weight ratio of ball to material is 10:1, and the grinding medium is absolute ethanol , the amount of absolute ethanol added is 300mL, and ground for 25 hours at a grinding speed of 60r / min;

[0102] After grinding, filter through a...

Embodiment 2

[0114] Repeat the preparation process of Example 1, the only difference is that the proportion of Co powder is 11.5%, the proportion of WC powder is 56%, and the other processes are the same as in Example 1.

[0115] The near-surface region and internal microstructure of the prepared decarburized cemented carbide materials were measured as follows: figure 2 (a) and figure 2 (b) shown. From figure 2 It can be seen from (a) that the near-surface region of the prepared cemented carbide is a decarburized phase structure, from figure 2 It can be seen in (b) that the interior is a normal phase structure, indicating that the surface decarburization phase gradient cemented carbide material has been successfully prepared. And there is a smooth transition from the surface layer to the internal composition without sudden changes, and there is no stress concentration on the interface between the surface layer and the interior.

[0116] The surface thickness of the decarburized pha...

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Abstract

The invention discloses a surface-layer decarburized phase gradient cemented carbide material and a preparation method thereof. The cemented carbide material comprises binder, (W, Ti)C powder, carbonitride or nitride, WC powder and W The raw material components of the powder are obtained. The preparation method includes: mixing the binder, (W, Ti)C powder, carbonitride or nitride, WC powder and W powder, grinding, drying and pressing to form a green body, and then The green body is vacuum sintered. The present invention introduces a small amount of carbonitrides or nitrides into the YT (WC-TiC-Co) type cemented carbide, and utilizes the sensitivity of the W-C-Co system to carbon than the W-Ti-C(N)-Co system Higher, adjust the carbon content by W, so that the total carbon content is lower than the lower limit of the W-C-Co system and higher than the lower limit of the W-Ti-C(N)-Co system, so that the surface layer obtains a decarburized phase structure without internal decarburization. Carbon phase structure, so as to obtain surface gradient cemented carbide material with high hardness of surface decarburized phase, good abrasive wear resistance, and good plastic deformation resistance of internal normal structure. The preparation method of the cemented carbide is simple and easy to control.

Description

technical field [0001] The invention belongs to the field of hard alloy wear-resistant materials, and relates to a hard alloy material and a preparation method thereof, in particular to a surface decarburized phase gradient hard alloy material and a preparation method thereof. Background technique [0002] Abrasive wear is a form of mechanical wear that results from the accumulation of damage caused by the plowing action of hard particles on the surface of a component in the absence of impact loads. The higher the hardness of the component material, the stronger its ability to resist the plowing action of external hard particles, and the smaller the damage caused. Small dry wire drawing dies, nozzles of sand blasting machines, spheres and liners of ball mills, centralizers of oil drilling, etc. can be considered as representatives of pure anti-abrasive wear components, and their failure is due to the plowing of abrasive particles on the surface of components. result in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F3/10
CPCC22C29/08C22C29/067C22C1/058B22F3/1021B22F3/1035B22F3/1039
Inventor 杨天恩牛国梁王昊梓轲朱幼宇桑江燕
Owner SICHUAN UNIV
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