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Al2O3 ceramic tools with diffusion bonding enhanced layer

A technology of diffusion bonding and alumina, applied in the direction of solid-state diffusion coating, manufacturing tools, and coating of superimposed layers, which can solve the problems of high toughness and low hardness

Inactive Publication Date: 2010-06-16
KENNAMETAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher ZrO 2 Compositions with lower hardness but higher toughness

Method used

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  • Al2O3 ceramic tools with diffusion bonding enhanced layer
  • Al2O3 ceramic tools with diffusion bonding enhanced layer
  • Al2O3 ceramic tools with diffusion bonding enhanced layer

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Embodiment Construction

[0020] The present invention relates to a cutting tool comprising a substrate of alumina and zirconia and a diffusion bonding enhanced layer. The diffusion bonding enhanced layer results from a reaction between the reagent and at least one of zirconia and alumina in the substrate. The diffusion bonding enhanced layer may contain nitrides of zirconium and aluminum, and the presence of these compounds increases the adhesion of subsequent coatings. So the diffusion bonding enhanced layer can be used as an intermediate layer between the substrate and the wear layer. The presence of a diffusion bonding enhancing layer can significantly improve the coated Al 2 o 3 Tool life of ceramic cutting inserts. One embodiment of the present invention consists in the combination of at least one of alumina and zirconia of the substrate with nitrogen (N 2 ) and aluminum chloride (AlCl 3 ) The chemical reaction of the mixture in the surface area. The reaction can be at N 2 and AlCl 3 betw...

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Abstract

The present invention relates to ceramic cutting tools, such as, a aluminum oxide with zirconium oxide ceramic cutting tool with diffusion bonding enhanced layer and CVD coatings, particularly usefulfor machining modern metal materials. The method comprises a chemical reaction with a mixture including nitrogen and aluminum chloride introduced to form a diffusion bonding enhanced layer between theceramic substrate and the CVD coatings. Thus formed diffusion bonding is highly adherent to the aluminum oxide with zirconium oxide ceramic substrate and significantly enhances the CVD coating properties, and thus improving the machining performance in terms of the tool life of zirconium-based aluminum oxide with zirconium oxide ceramic cutting tools.

Description

Background of the invention [0001] Most cutting inserts today comprise a substrate made of cemented carbide because of its high toughness and excellent wear resistance. However, the use of cutting tools and cutting inserts with ceramic substrates (“ceramic tools”) is increasing. Such ceramic tools find widespread use in high-speed finishing operations and are used to machine difficult-to-machine materials at high cutting rates. The increase in the application of ceramic tools may be due to the improvement of alloy ceramics and ceramic-matrix composites and the progress of ceramic processing technology. Ceramics used in cutting tools are generally inorganic non-metallic materials. [0002] The preparation of ceramic tools usually involves the fusion and sintering of powdered ceramics. Sintering provides the desired densification of the fused powder and can optionally be performed under pressure. In pressureless sintering, the powder is first shaped into a green or green bod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/00C23C16/30C23C8/24C23C30/00C23C28/02B32B9/00C04B41/52C04B41/89C23C8/02C23C10/02C23C12/02C23C16/00
CPCC04B41/009C23C8/02C23C12/02C04B41/52C04B41/89C23C30/005C23C10/02Y10T407/27Y10T428/24975Y10T428/265Y10T407/25C04B41/4531C04B41/5063C04B41/5068C04B41/5061C04B41/524C04B35/117C04B35/119C23C8/24C23C28/02C23C16/30C04B41/87
Inventor X·丹尼尔·方戴维·J·威尔斯吉勒斯·费斯蒂厄
Owner KENNAMETAL INC