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High-wear-resistance WC-Co-based alloy and preparation method thereof

A high wear resistance, base alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problem of uneven distribution of hard alloy fine particles, lack of redistribution of Co binder phase, and uneven internal force and other problems, to achieve the effect of easy control, enhanced wear resistance, and enhanced wear resistance

Active Publication Date: 2022-02-01
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in building a non-uniform structure. If the coarse and fine particles are not mixed uniformly, it will lead to uneven distribution of cemented carbide fine particles in the coarse particle gap, that is, it will not be able to redistribute the Co binder phase. Uneven stress reduces strength

Method used

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  • High-wear-resistance WC-Co-based alloy and preparation method thereof
  • High-wear-resistance WC-Co-based alloy and preparation method thereof
  • High-wear-resistance WC-Co-based alloy and preparation method thereof

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preparation example Construction

[0017] On the one hand, this specific embodiment discloses a preparation method of a high wear resistance WC-Co-based alloy, including the following steps:

[0018] S1. Perform ball milling and wet mixing of coarse tungsten carbide, ultrafine tungsten powder, ultrafine cobalt powder, tantalum carbide, paraffin and stearic acid to obtain a slurry;

[0019] S2, drying the slurry obtained in step S1 after filtering, granulating and pressing to obtain a green body after obtaining the dry material;

[0020] S3. Sintering the green body obtained in step S2. The sintering includes four stages, which are dewaxing, vacuum sintering, low-pressure sintering and cooling in sequence, and finally a WC-Co-based alloy is obtained.

[0021] Wherein, in step S1, by weight, the coarse particle tungsten carbide is 92.1-92.55 parts, the ultra-fine tungsten powder is 1.25-1.7 parts, the ultra-fine cobalt powder is 5.5-6.5 parts, and the tantalum carbide is 0.1 parts -0.3 parts, 1.5-2.5 parts for p...

Embodiment 1

[0039] This embodiment provides a method for preparing a highly wear-resistant WC-Co-based alloy, comprising the following steps:

[0040] S1. Perform ball milling and wet mixing of coarse tungsten carbide, ultrafine tungsten powder, ultrafine cobalt powder, tantalum carbide, paraffin wax, stearic acid and molybdenum carbide powder to obtain a slurry;

[0041] In parts by weight, there are 92.4 parts of coarse tungsten carbide, 1.4 parts of ultrafine tungsten powder, 6.2 parts of ultrafine cobalt powder, 0.1-0.2 parts of tantalum carbide, 2 parts of paraffin, and 0.04 parts of stearic acid. Carbonized molybdenum carbide powder is 0.2 parts.

[0042] Among them, the carbon content of coarse-grained tungsten carbide is 6.15%, the average particle size of coarse-grained tungsten carbide is 28 microns, the average particle size of ultra-fine tungsten powder is 0.4 microns, and the average particle size of ultra-fine cobalt powder is 1 micron.

[0043] Among them, in the process o...

Embodiment 2

[0058] This embodiment provides a method for preparing a highly wear-resistant WC-Co-based alloy, comprising the following steps:

[0059] S1. Perform ball milling and wet mixing of coarse tungsten carbide, ultrafine tungsten powder, ultrafine cobalt powder, tantalum carbide, paraffin wax, stearic acid and molybdenum carbide powder to obtain a slurry;

[0060] In parts by weight, 92.1 parts of coarse tungsten carbide, 1.25 parts of ultrafine tungsten powder, 5.5 parts of ultrafine cobalt powder, 0.1 part of tantalum carbide, 1.5 parts of paraffin, 0.02 parts of stearic acid, molybdenum carbide powder is 0.15 parts.

[0061] Among them, the carbon content of coarse-grained tungsten carbide is 6.145%, the average particle size of coarse-grained tungsten carbide is 26 microns, the average particle size of ultra-fine tungsten powder is 0.3 microns, and the average particle size of ultra-fine cobalt powder is 0.9 microns.

[0062] Among them, in the process of ball milling wet mix...

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Abstract

The invention provides a preparation method of a high-wear-resistance WC-Co-based alloy. The preparation method comprises the following steps that S1, coarse-particle tungsten carbide, superfine tungsten powder, superfine cobalt powder, tantalum carbide, paraffin and stearic acid are subjected to ball milling and wet mixing, and slurry is obtained; S2, the slurry obtained in the step S1 isfiltered and dried to obtain a dry material, granulated, and pressed to obtain a biscuit; and S3, the biscuit obtained in the step S2 is sintered, sintering comprises four stages including dewaxing, vacuum sintering, low-pressure sintering and cooling in sequence, and finally the WC-Co-based alloy is obtained. According to the preparation method of the high-wear-resistance WC-Co-based alloy, the raw material formula of the alloy is compounded, a specific sintering process is combined, and nano-particle decarburization phase precipitation is realized in the Co phase of the alloy, so that the wear resistance of the alloy is obviously enhanced under the condition that the bending strength of the alloy is not obviously reduced, and the service life of the manufactured tool / part is obviously prolonged.

Description

technical field [0001] The invention relates to the technical field of hard alloy wear-resistant materials, in particular to a high wear-resistant WC-Co-based alloy and a preparation method thereof. Background technique [0002] WC-Co cemented carbide is made into various tools due to its high strength and high hardness, which are widely used in machining, mining, road milling, mold processing and other fields. The initial cemented carbide uses WC as the hard phase, Co as the binder phase, and is basically a pure WC-Co alloy. Generally, alloys with high cobalt content have good toughness, but poor wear resistance. [0003] At present, the commonly used methods to improve the wear resistance of WC-Co cemented carbide include building a non-uniform structure, building a functionally gradient structure, adding hard particles, and precipitation and decarburization. However, there are some problems in building a non-uniform structure. If the coarse and fine particles are not mi...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05B22F1/10B22F3/10B22F3/14
CPCC22C29/08C22C1/051B22F3/1021B22F3/14
Inventor 张钱伟时凯华顾金宝董凯林曾伟王鹏
Owner ZIGONG CEMENTED CARBIDE CORP
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