Method for consolidating tough coated hard powders

A coating, liquid technology used in coatings, process efficiency improvements, transportation and packaging

Inactive Publication Date: 2007-07-11
阿洛梅特公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] While these techniques have reduced the problems present in liquid phase sintering of conventional hard metals, there remains an unmet need for methods of making particles and articles formed from those particles that, after sintering, Uniform properties throughout WC and binder powders

Method used

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  • Method for consolidating tough coated hard powders
  • Method for consolidating tough coated hard powders
  • Method for consolidating tough coated hard powders

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other Embodiment approach

[0050] In other embodiments, most microparticles contain WC, W 2 C, tool steel, transparent (glassy) and opaque (devitrified) nano-steel (nanosteel) alloy, silicon nitride, or intermediate layer of tantalum carbide. The fracture toughness of this material is higher than that of cubic boron nitride. It should be understood, however, that the material of the intermediate layer need only have a relatively higher fracture toughness than the material containing the core particles, and be able to combine with the metal compound or material forming the core particles and also be able to combine with a metal selected from the group consisting of iron , cobalt, nickel, copper, titanium, aluminum, magnesium, lithium, beryllium, silver, gold, and platinum.

[0051] In one non-limiting embodiment, the coated microparticles have an average particle size of less than about 1000 microns. In another embodiment, the coated microparticles may have an average particle size of less than about 1...

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Abstract

A method of consolidating particulate materials into articles having combinations of properties not available by conventional processes by liquid phase sintering. These particulate materials are comprised of core particles individually coated with layers of a metal compound having a relatively higher fracture toughness than the core, such as WC or TaC. These coated particles include an outer layer comprised a metal, such as Co or Ni. The particles with these coatings are pressed to form an article and the article densified at pressures and temperatures where full density is achieved without the degradation of the material forming the core particle.

Description

field of invention [0001] The present invention discloses a method of consolidating tough-coated hard powders (TCHP) to substantially full density under low or no pressure, and the use of the method to consolidate Knotted products. The method is a cost-effective method of preparing sintered bodies of TCHP material, based on liquid phase sintering, thereby offering added value over traditional hard articles and tool materials currently known in the art. Background of the invention [0002] Sintering can be defined as the thermal treatment of a powder or compact for the purpose of binding particles together to form a solid article. [0003] In some applications where the powder consists of a mixture of at least two distinct materials with different melting points, the powder mixture is compacted into a porous ("green") body. The body is heated at a temperature above the melting point of the lowest melting component and a portion of the compacted loose powder mixture is lique...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F1/16B22F1/17
CPCB22F3/1035B22F1/025B22F1/17B22F1/16B22F7/02
Inventor 理查德·E·托特
Owner 阿洛梅特公司
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