Composite sintered compact

A sintered body, volume technology, used in the manufacture of tools, transportation and packaging, accessories for tool holders, etc., can solve problems such as binder falling off

Active Publication Date: 2008-07-09
SUMITOMO ELECTRIC HARDMETAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, separation occurs between the cubic boron nitride and the binder, and as a result, the binder, etc. are easily detached from the sintered body
[0008] This defect is particularly problematic when cutting hard materials such as hardened steel, where the cutting edge of the cutting tool is more likely to be subjected to temperatures of 600°C or higher

Method used

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  • Composite sintered compact
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Examples

Experimental program
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Effect test

Embodiment 1

[0095] First, the Ti X N Y (wherein X=0.5 and Y=0.25) powder and Al powder were uniformly mixed together at a mass ratio of 80:20, and then the resulting mixed powder was vacuum heat-treated at a temperature of 1200° C. for 30 minutes using a vacuum furnace. Thereafter, the mixed powder subjected to the above heat treatment was pulverized using a ball mill composed of a barrel (made of cemented carbide) and balls (made of cemented carbide), thereby obtaining a binder raw material powder.

[0096] Next, the cubic boron nitride powder with an average particle diameter of 3.8 μm and the binder raw material powder obtained in the above manner were uniformly mixed with a ball mill so that the cubic boron nitride powder accounted for 70% by volume. Thereafter, the obtained mixed powder was placed in a vacuum furnace at a temperature of 900° C. for 20 minutes for degassing treatment.

[0097] Then, the mixed powder subjected to the above-mentioned degassing treatment was sandwiched...

Embodiment 2 to 3

[0110] Prepare the composite sintered body of the present invention according to the method in Example 1, the difference is that Zr X N Y (where X=0.5 and Y=0.25) powder (Example 2) or Ti X C Y N Z (where X=0.5 and Y=Z=0.125) powder (Example 3) instead of Ti in Example 1 X N Y (where X=0.5 and Y=0.25) powder. Table 1 below shows various properties measured or tested according to the method in Example 1.

Embodiment 4 to 5

[0112] Prepare the composite sintered body of the present invention according to the method in embodiment 1, difference is: the mixing ratio of cubic boron nitride powder is changed from 70 volume % in embodiment 1 to 75 volume % (embodiment 4) or 65 Volume % (Example 5). Table 1 below shows various properties measured or tested according to the method in Example 1.

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Abstract

A composite sintered compact containing at least a cubic boron nitride and a binding material, characterized in that a plurality of cubic boron nitride particles are bound to each other, and thereby the cubic boron nitride has a continuous structure, and a plurality of binding material particles being present in the region except the binding interface, in which the above cubic boron nitride particles are bound to each other, and thereby the binding material also has a continuous structure.

Description

technical field [0001] The present invention relates to a composite sintered body comprising at least cubic boron nitride and a binder, and more particularly, the present invention relates to a composite sintered body particularly suitable for use in applications such as cutting tools. Background technique [0002] Traditionally, high hardness sintered bodies mainly composed of cubic boron nitride have been used in applications such as cutting tools. This type of sintered body is usually a composite sintered body containing cubic boron nitride and a binder whose main purpose is to maintain the strength of the former. For example, known is a sintered body having a "sea-island" structure in which cubic boron nitride particles (islands) are dispersed in a continuous phase (sea) composed of a binder (Japanese Patent Application Laid-Open No. 53-077811 ( Patent Document 1) and Japanese Patent Application Laid-Open No. 10-182242 (Patent Document 2)). [0003] The purpose of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831B23B27/14
CPCC04B35/5831C04B35/6265C04B35/6268C04B35/6303C04B35/63444C04B35/645C04B2235/3217C04B2235/3804C04B2235/3813C04B2235/3856C04B2235/3865C04B2235/3869C04B2235/3886C04B2235/402C04B2235/5436C04B2235/5445C04B2235/786C04B2235/80C04B2235/85C04B2235/96C04B2235/9607C04B2235/9692Y10T428/24893B23B27/14
Inventor 冈村克己久木野晓深谷朋弘
Owner SUMITOMO ELECTRIC HARDMETAL CORP
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