Method for preparing WC-Co gradient hard alloy material

A cemented carbide and gradient technology, which is applied in the field of preparation of WC-Co gradient cemented carbide materials, can solve the problems of difficult to control and smooth the contact surface, incompletely dense samples, complicated processes, etc., to achieve easy operation, reduce production costs, The effect of excellent microstructure

Active Publication Date: 2009-09-30
合肥庐阳科技创新集团有限公司
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AI Technical Summary

Problems solved by technology

This process uses dry powder as raw material for layered pressing. Due to the mutual extrusion of different components and particle sizes, the contact surface is difficult to control and smooth, resulting in incomplete densification or unevenness of the sample; while the impregnation method needs to be prepared first. Porous WC skeleton and impregnation treatment, the process is more complicated

Method used

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  • Method for preparing WC-Co gradient hard alloy material
  • Method for preparing WC-Co gradient hard alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) WC powder, Co powder, according to a certain proportion (96wt% WC-4wt.% Co, 92wt% WC-8wt.% Co, 90wt% WC-10wt.% Co, etc.) were mixed in alcohol solvent for more than 24h , then add the binder PVB of 4wt% and mix 24h again, obtain the plastic (I) that can be roll-formed;

[0029] (2) the plastic (1) of above-mentioned different composition rolls repeatedly on the two-roll film rolling machine, obtains the film blanks such as WC-4wt.% Co, WC-8wt.% Co, WC-10wt.% Co of different compositions ( I);

[0030] (3) The above-mentioned film blanks with different Co contents are stacked, and then co-rolled on a film rolling machine to obtain a WC-Co composite blank (I) with a multilayer structure;

[0031](4) The composite compact (I) of (3) is pre-fired in a sintering furnace and a hydrogen atmosphere, the pre-fire temperature is 800°C, and the pre-fire time is 120min. remove organic matter;

[0032] (5) Put (4) calcined green body at 1450°C in H 2 Sintering at lower tempe...

Embodiment 2

[0033] (1) WC and Co powder are used as raw materials, wherein the particle size of WC is 2 μm and 7 μm respectively, and 92wt% WC-8wt.% Co is prepared. After ball milling in water for 24 hours, add 5wt% binder MC in proportion and mix evenly for 24 hours to obtain roll-formable plastic (II);

[0034] (2) Repeatedly rolling the above-mentioned plastic (II) on a two-roll film rolling machine to obtain a 92wt% WC-8wt.% Co cemented carbide film blank (II) with different coarse and fine grains;

[0035] (3) The above-mentioned same Co content, different WC particle size alloy film blanks are stacked on a film rolling machine, and prepared into a WC-Co composite blank (II) with a multi-layer structure through rolling;

[0036] (4) The green body obtained in (3) was pre-fired in a sintering furnace and a hydrogen atmosphere, the pre-fire temperature was 750° C., and the pre-fire time was 90 minutes. removal of organic matter;

[0037] (5) Put (4) calcined body at 1400°C in H 2 Un...

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Abstract

A method for preparing WC-Co gradient hard alloy material includes ballmilling the WC powder, Co powder, adhesive and dissolvent made based on required ratio to mix into a moldable material; rolling the moldable material into monolithic film blanks with different Co content or different WC grain fineness number separately by a double-roller film machine, then laminating the monolithic film blank in sequence to roll again to obtain multilayer composite blank with different Co content or different WC grain fineness number; then the multilayer composite blank is feed to a sintering furnace to pre-sinter for 90 to 150 min at a temperature range from 750 to 800 DEG C with hydrogen gas, then to sinter for 40 to 80 min at a temperature range from 1350 to 1500 DEG C, last to cool to obtain the WC-Co gradient hard alloy material. The relative density of the material is all higher than 99%. The Rockwell hardness is all higher than 88HRA, and the flexural strength is improved obviously comparing with the hard alloy containing uniform component.

Description

1. Technical field [0001] The invention relates to a production method of a cemented carbide material, in particular to a production method of a special cemented carbide material with a gradient structure, specifically a preparation method of a WC-Co gradient cemented carbide material. 2. Background technology [0002] Cemented carbide is a sintered material composed of a hard refractory metal carbide phase (such as WC, etc.) and a binder metal phase (such as Co, etc.), with high hardness, high strength, high elastic modulus, wear resistance and corrosion resistance It is widely used in various cutting tools, mining tools and wear-resistant and corrosion-resistant parts. With the development of modern industry, higher requirements are put forward for cemented carbide. If it is required to have high hardness, it also has high toughness. Generally speaking, the hardness and toughness of cemented carbide are related to its Co content and grain size. If the Co content is high,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05
Inventor 程继贵朱金传万磊王谊芳
Owner 合肥庐阳科技创新集团有限公司
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