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Cemented carbide material

A technology of sintered carbide and sintered body, which is applied in the field of sintered carbide materials, can solve problems such as increasing costs and reducing production speed, and achieves the effects of improving manufacturing efficiency, reducing manufacturing time, and improving fracture resistance

Active Publication Date: 2014-01-15
ELEMENT SIX LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can often be expected to increase wear resistance by controlling the composition, leading to a compromise in fracture resistance and vice versa
Although extended heat treatment times for cemented carbide materials can be used to alter their properties, this slows down production rates and tends to increase costs

Method used

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  • Cemented carbide material
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  • Cemented carbide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A very coarse WC powder (from H.C.Starck, Germany) with an average grain size (Fischer number, Fischer number) of 40.8 μm TM MAS3000-5000 TM ) and a hyper-stoichiometric carbon content of 6.12 wt% were mixed with about 9.7 wt% Co powder and about 2 wt% W metal powder. The average particle size of both the W powder and the Co powder is about 1 micron. Thus, the composition of the combined powder was 88.3% by weight WC (with excess carbon), 9.7% by weight Co and 2% by weight W. The total equivalent carbon (ETC) of the mixture was 6.0% by weight relative to WC. The powders were co-milled by ball milling for 10 hours using a powder-ball ratio of 1:3 in grinding media containing hexane with 2% by weight of paraffin wax. The powder is dried and the green body is prepared by compacting the powder mixture for sintered bodies configured for transverse rupture strength (TRS) measurements according to ISO3327-1982 and wear resistance measurements according to ASTM B611-85 . T...

Embodiment 2

[0050] The bulk of the sample was prepared as described in Example 1, except that the WC powder was mixed with about 6.2 wt% Co powder and about 2 wt% W metal powder.

Embodiment 3 to 11

[0052] Sample bodies were prepared containing different grades of cemented carbide material with an average grain size of WC of about 1 micron and a Co content of about 13% by weight. These bodies were heat treated at temperatures ranging from 600 degrees Celsius to 800 degrees Celsius for 0.5 hours, 1 hour and 2 hours, as shown in Table 1 below. The density, magnetic saturation and magnetic coercive force of the sintered body were measured before and after aging. Before aging, the density of the sintered body was 14.3g / cm 3 , the magnetic saturation is 16.2G.cm 3 / g and the magnetic coercive force is 144Oe. The table below also shows the respective density, magnetic saturation, magnetic coercivity and Vickers hardness of each sample body aged under different conditions.

[0053] Table 1

[0054]

[0055] To observe the effect of longer aging times, material samples were heat-treated for 5 hours and 10 hours at each temperature of 600 °C, 680 °C and 800 °C for cumulativ...

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Abstract

Cemented carbide material comprising tungsten carbide (WC) material in particulate form having a mean grain size D in terms of equivalent circle diameter of at least 0.5 micron and at most 10 microns, and a binder phase comprising cobalt (Co) of at least 5 weight per cent and at most 12 weight per cent, W being present in the binder at a content of at least 10 weight per cent of the binder material; the content of the WC material being at least 75 weight per cent and at most 95 weight per cent; and nanoparticles dispersed in the binder material, the nanoparticles comprising material according to the formula CoxWyCz, where X is a value in the range from 1 to 7, Y is a value in the range from 1 to 10 and Z is a value in the range from 0 to 4; the nanoparticles having a mean particle size at most 10 nm, at least 10 per cent of the nanoparticles having size of at most 5 nm; the cemented carbide material having a magnetic coercive force in the units kA / m of at least -2.1 * D + 14.

Description

technical field [0001] The present invention generally relates to cemented carbide materials, tools containing the materials, and methods of making the materials. Background technique [0002] Cemented carbide materials contain metal carbides such as tungsten carbide (WC) or titanium carbide (TiC) particles dispersed in a binder material containing metals such as cobalt (Co), nickel (Ni) or metal alloys. It can be considered that the binder phase binds the carbide particles together into a sintered body. Measurements of magnetic properties can be used to indirectly measure microstructural and performance aspects of cemented carbide materials. Magnetic coercivity (or simply coercivity or coercivity) and magnetic moment (or magnetic saturation) can be used for this purpose. [0003] European Patent No. 1043415 discloses a coated cemented carbide insert (coated cemented carbide insert), which has a thickness of 5-50 microns and a surface region substantially free of gamma pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/00C22C29/00C22C29/08
CPCB22F3/24B22F7/00B22F7/008B22F2003/248B22F2005/001B22F2301/15B22F2302/10C22C29/005C22C29/067C22C29/08
Inventor 伊戈尔·尤里耶维奇·孔亚申贝恩德·海因里希·里斯弗兰克·弗里德里希·拉赫曼
Owner ELEMENT SIX LTD