New process of manufacturing cemented carbide and a product obtained thereof

A cemented carbide and hard technology, which is applied in the field of manufacturing cemented carbide, can solve the problems of reducing the toughness of sintered products and not being solved.

Inactive Publication Date: 2016-02-17
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When utilizing hexagonally doped WC, the main challenge from a processing point of view is to avoid precipitation of doped transition metals, for example in the form of tantalum carbide or tantalum carbonitride, from the hexagonally doped WC phase during the sintering process, and None of the above methods solved the problem
In addition, for the specific application of sintered cubic carbides, there is also the challenge of avoiding precipitation of cubic carbides or other additional carbides or carbonitrides, which would reduce the toughness of the resulting sintered product

Method used

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  • New process of manufacturing cemented carbide and a product obtained thereof
  • New process of manufacturing cemented carbide and a product obtained thereof
  • New process of manufacturing cemented carbide and a product obtained thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0076] composition

[0077] Using ThermoCalc software [J.-O.Andersson, T.Helander, L.Hoglund, P.Shi, and B.Sundman, Thermo-Calc & DICTRA, computational tools formaterial science, Calphad, 2002: 26 (2): 273 -312] Determination of composition. The standard is that the carbon activity in the fcc+MC+WC region is 0.5 in a liquid at 1410° C. and a Co composition of 6 wt%.

[0078] Table 1. Composition of pre-alloyed raw materials and reference raw materials in % by weight. Values ​​are provided by powder manufacturer Wolfram Bergbau.

[0079] powder

C (wt%)

Ta (wt%)

Cr(wt%)

Grain size (μm)

(W, Ta)

6.16

0.8439

4.35

(W, Cr)

6.13

0.6499

3.85

WC

6.15

4.25

[0080]Samples are listed in the table below. Each sample has a reference with the same Ta or / and Cr content. Furthermore, pure samples of WC+Co were fabricated without any added carbides.

[0081] (W, Ta)C+CoWC+TaC+C...

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Abstract

The present relates to a process of manufacturing cemented carbide and to a product obtained thereof wherein hex doped WC is subjected to nitrogen before and / or during sintering.

Description

technical field [0001] The present invention relates to a method for the manufacture of cemented carbide and the products obtained therefrom and their use. Background technique [0002] Cemented carbide is used to manufacture sintered bodies such as cutting tools, wear-resistant parts, drill bits, etc. The cemented carbide industry is also interested in producing materials that are hard and wear resistant at high speeds. This can be achieved by using e.g. TiN, Ti(C,N), (Ti,Al)N and / or Al 2 o 3 A layer of coated cemented carbide is achieved. WC-Co alloy is the most commonly used rock drilling material. Knowledge about hard metals and methods of improving hard WC phases is important for the development of new and improved rock drilling machines. [0003] US2005 / 0025657 discloses a method of making fine grained tungsten carbide-cobalt cemented carbide comprising mixing, grinding according to standard practice, followed by sintering. Grain refinement including reduced grai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02
CPCC22C29/02C22C29/08B22F2005/001C04B35/5626C22C29/005
Inventor 苏珊·诺格伦乔斯·加西亚
Owner SANDVIK INTELLECTUAL PROPERTY AB
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