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Functionally graded cemented carbide with engineered hard surface and the method for making the same

一种硬质合金、功能梯度的技术，应用在结合耐磨性及韧性的功能梯度硬质合金领域，能够解决功能梯度硬质合金制备困难等问题

Active Publication Date: 2010-06-09
UNIV OF UTAH RES FOUND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the many potential advantages of functionally graded cemented carbide (FGM WC-Co) can be easily understood, the preparation of functionally graded cemented carbide (FGM WC-Co) is an extremely difficult challenge

Method used

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  • Functionally graded cemented carbide with engineered hard surface and the method for making the same
  • Functionally graded cemented carbide with engineered hard surface and the method for making the same
  • Functionally graded cemented carbide with engineered hard surface and the method for making the same

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[0033] The present invention relates to a surface-hardened functionally graded cemented carbide and a preparation method thereof. The cemented carbide is prepared by liquid phase sintering and the liquid phase sintering can be an existing standard method. These standard methods include, for example: preparing tungsten carbide - Cobalt (WC-Co) powder which is a mixture of powders of tungsten carbide, tungsten, carbon and cobalt, and pressing these powders together. In other embodiments, these powders can be pressed using some known techniques, such as uniaxial cold pressing.

[0034] After the powder is compacted, the powder can be sintered using some standard sintering process, such as maintaining a temperature of 1400°C in a vacuum. The existing sintering process can produce a uniform cemented carbide, that is, the amount of cobalt in the tungsten carbide (WC) matrix is ​​uniformly distributed throughout the sample. However, in this embodiment, in addition to the aforementio...

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Abstract

A method for manufacturing functionally graded cemented carbide with hard and wear-resistant surface and tough core is described. The said functionally graded cemented carbide has a surface layer having a reduced amount of cobalt. Such a hard surface and tough core structure is an example of functionally graded materials in which mechanical properties are optimized by the unique combination of wear-resistance and toughness. The cemented carbide with reduced-cobalt surface layer may be fabricated through a carburization heat treatment process following conventional liquid phase sintering. The graded cemented carbide thus obtained contains no brittle Eta phase.

Description

【Technical field】 [0001] The invention relates to a surface-hardened functionally graded cemented carbide and a preparation method thereof, in particular to a functionally graded cemented carbide combining wear resistance and toughness. 【Background technique】 [0002] Functionally graded cemented tungsten carbide (FGMWC-Co) materials can also be referred to as tungsten carbide-cobalt (WC-Co) composite materials, these tungsten carbide-cobalt (WC-Co) composite materials can be used to make metal Cutting tools, rock drilling tools for oil exploration or mining or construction, road engineering tools, many other metal working tools, metal forming tools and other applications. For an introduction to the prior art, reference may be made to US Patent Publication No. 2005 / 0276717. This US patent has publicly stated that the material constituting the cemented carbide needs to contain a certain amount of cobalt, so this type of material is called tungsten carbide-cobalt (WC-Co) comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08C22C32/00C22C30/00
CPCB22F2003/241B22F2998/10C22C29/08B22F2999/00B22F3/02B22F3/1035B22F3/24B22F3/10B22F2201/30B22F2207/03
Inventor 房志刚范鹏郭军
Owner UNIV OF UTAH RES FOUND
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