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Preparation method of high-wear-resistance WC-based hard alloy

A cemented carbide, high wear-resistant technology, applied in the field of cemented carbide preparation of high wear-resistant parts, can solve the problems of component segregation, difficult to distribute uniformly, not suitable for industrial production, etc., to strengthen the physical properties of the alloy and improve the mixing uniformity. properties, and the effect of improving corrosion resistance

Inactive Publication Date: 2020-01-31
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of ball milling and mixing, it is difficult to distribute the trace amount of Co and the grain growth inhibitor evenly in the raw material powder system, which can easily cause the component segregation of the trace amount of Co and the grain growth inhibitor, resulting in the tungsten carbide grains in the sintering process. Abnormal non-uniform growth, making the material exhibit unstable mechanical properties
In addition, microwave sintering, spark plasma sintering and gas pressure sintering have not been applied industrially due to high requirements on equipment; hot pressing sintering method is not suitable for preparing products with large size and complex shape, nor is it suitable for industrial production

Method used

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  • Preparation method of high-wear-resistance WC-based hard alloy
  • Preparation method of high-wear-resistance WC-based hard alloy
  • Preparation method of high-wear-resistance WC-based hard alloy

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Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing a highly wear-resistant WC-based cemented carbide, comprising the following steps:

[0034] Step 1. Weigh the following raw materials with a total mass of 1Kg of raw materials and a carbon ratio of 1:1.005: 908.7g of tungsten powder (Fsss particle size is 0.5-1.5μm), carbon powder 62.3g (Fsss particle size of 1.0-2.0μm ), molybdenum powder 21.0g (Fsss particle size is 1.0-2.0μm), chromium carbide powder 5.0g (Fsss particle size is 1.5-3.0μm), vanadium carbide powder 3.0g (Fsss particle size is 1.5-3.0μm), spare;

[0035] Step 2. After mixing the raw materials, carry out wet grinding, vacuum drying, carbonization, dry grinding, and sieving; wherein, the wet grinding conditions are: using a 2.4L cantilever ball mill, with diameter The WC-6wt% Co cemented carbide ball is used as the grinding body, the ball-to-material ratio (wt%) is 4:1, hexane is used as the wet grinding medium, the amount of hexane is 670ml / Kg, and the spe...

Embodiment 2

[0040] This embodiment provides a method for preparing a highly wear-resistant WC-based cemented carbide, comprising the following steps:

[0041] Step 1. Weigh the following raw materials with a total mass of 1Kg of raw materials and a carbon ratio of 1:1.010: tungsten powder 897.5g (Fsss particle size is 0.5-1.5μm), carbon powder 63.2g (Fsss particle size is 1.0-2.0μm ), molybdenum powder 32.0g (Fsss particle size is 1.0-2.0μm), chromium carbide powder 5.0g (Fsss particle size is 1.5-3.0μm), vanadium carbide powder 3.0g (Fsss particle size is 1.5-3.0μm), spare;

[0042] Step 2. After mixing the raw materials, carry out wet grinding, vacuum drying, carbonization, dry grinding, and sieving; wherein, the wet grinding conditions are: using a 2.4L cantilever ball mill, with diameter The WC-6wt% Co cemented carbide ball is used as the grinding body, the ball-to-material ratio (wt%) is 4:1, hexane is used as the wet grinding medium, the amount of hexane is 670ml / Kg, and the speed ...

Embodiment 3

[0047] This embodiment provides a method for preparing a highly wear-resistant WC-based cemented carbide, comprising the following steps:

[0048] Step 1. Weigh the following raw materials with a total mass of 1Kg and a carbon ratio of 1:1.013: tungsten powder 871.0g (Fsss particle size is 0.5-1.5μm), carbon powder 64.9g (Fsss particle size is 1.0-2.0μm ), molybdenum powder 57.3g (Fsss particle size is 1.0-2.0μm), chromium carbide powder 5.5g (Fsss particle size is 1.5-3.0μm), vanadium carbide powder 2.5g (Fsss particle size is 1.5-3.0μm), spare;

[0049] Step 2. After mixing the raw materials, carry out wet grinding, vacuum drying, carbonization, dry grinding, and sieving; wherein, the wet grinding conditions are: using a 2.4L cantilever ball mill, with diameter The WC-6wt% Co cemented carbide ball is used as the grinding body, the ball-to-material ratio (wt%) is 5:1, hexane is used as the wet grinding medium, the amount of hexane is 700ml / Kg, and the speed of the ball mill ...

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Abstract

The invention provides a preparation method of a high-wear-resistance WC-based hard alloy. A certain amount of molybdenum powder, chromium carbide powder and vanadium carbide powder are added before tungsten powder carbonization, and are mixed with carbon powder by a wet grinding mode, so that the powder mixing uniformity is greatly improved; the doped molybdenum powder, chromium carbide powder and vanadium carbide powder can achieve an effect of inhibiting growth of tungsten carbide grains in the tungsten powder carbonization process in the step 2 and the alloy sintering process in the step 4; and meanwhile, in the tungsten powder carbonization process, molybdenum, chromium and alum can be largely or slightly dissolved in tungsten carbide to form (W, Mo, Cr, V) C solid solution, so that guarantee is provided for formation of (W, Mo, Cr, V) C solid solution powder with fine and uniform particle size in the later tungsten powder carbonization process, and the purpose of reinforcing physical performances of the tungsten carbide grains and alloys thereof is achieved. The prepared non-bonded-phase WC-based hard alloy is high in hardness and excellent in wear resistance, and can satisfythe high wear resistance requirements of water jet sand pipes and fracturing nozzles on materials.

Description

technical field [0001] The invention belongs to the technical field of producing cemented carbide by powder metallurgy, and in particular relates to a cemented carbide preparation method which can be used to produce high wear-resistant parts such as water jet sand pipes and fracturing nozzles with a high wear-resistant non-binding phase. Background technique [0002] WC-Co cemented carbide is widely used in cutting tools, mining tools, impact-resistant molds and wear-resistant parts because of its excellent hardness and wear resistance, good fracture strength and toughness [1] . The addition of binder phases such as Co is beneficial to the progress of sintering and the improvement of fracture toughness and strength, but at the same time, the presence of binder phases such as Co will also reduce the hardness and corrosion resistance of the material, and due to the difference in thermal expansion coefficient with tungsten carbide It is easy to cause thermal stress due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08B22F3/15B22F3/10B22F9/04C22C1/05C22C1/10
CPCB22F3/1007B22F3/15B22F9/04B22F2009/042B22F2009/043C22C1/055C22C29/067C22C29/08
Inventor 董凯林时凯华
Owner ZIGONG CEMENTED CARBIDE CORP
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