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Sintered cubic boron nitride tool

一种立方氮化硼、烧结体的技术，应用在制造工具、气态化学镀覆、金属加工设备等方向，能够解决脱落等问题

Active Publication Date: 2013-12-18
SUMITOMO ELECTRIC HARDMETAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Sintered cubic boron nitride tool
  • Sintered cubic boron nitride tool
  • Sintered cubic boron nitride tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] A cBN sintered body tool was fabricated in the following manner. First, TiN powder with an average particle size of 20 μm is mixed with Al powder with an average particle size of 20 μm at a mass ratio of TiN:Al=4:1. Then, the mixture was heat-treated at 1250° C. for 30 minutes in vacuum. The mixture obtained by the heat treatment was pulverized with pellets made of cemented carbide having a diameter of Φ4 mm and a crucible made of cemented carbide. In this way, the raw material powder constituting the binder phase is obtained.

[0101] Then, the obtained raw material powder constituting the binder phase was mixed with cBN particles having an average particle diameter of 4 μm to obtain a cBN content of 72% by volume. The mixture thus obtained was placed in a vacuum furnace, and the temperature therein was raised to 950°C. Then, the mixture was kept there for 30 minutes to degas the powders.

[0102] Next, the degassed powders were layered on a support plate made of c...

Embodiment 2-7 and comparative example 1-6

[0107] The same method as in Example 1 was used to manufacture the cBN sintered body tools of Examples 2-7 and Comparative Examples 1-6, the difference being that by changing the immersion time of the cBN sintered body in the mixed solution, as shown in Table 1 " The surface of the cBN sintered body of the cBN sintered body tool of Example 1 was changed as shown in the column "Concavity Coefficient".

[0108]

Embodiment 8-9 and comparative example 7

[0110] The cBN sintered body tools of Examples 8-9 and Comparative Example 7 were manufactured in the same manner as in Example 3, except that the cBN sintering of Example 3 was changed as shown in the column "Materials Constituting the Bonding Layer" of Table 1. The material that makes up the bonding layer in the bulk tool.

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Abstract

This sintered cubic boron nitride tool (1) in which a sintered cubic boron nitride (2) is joined to a tool material (4) via a joining layer (3) is characterized in that: the sintered cubic boron nitride (2) comprises 30 volume% to 95 volume% of cubic boron nitride particles and 5 volume% to 70 volume% of a bonding phase (6); and in at least one of the cut surfaces when the sintered cubic boron nitride tool (1) is cut at a plane that is perpendicular to the joining surface between the sintered cubic boron nitride (2) and the joining layer (3) where the surface area of the joining surface is maximal, if the points which are at a distance that is one fourth of the length of the line segment connecting a point A to a point B in the figure are called a point C and a point D, the area of the region, which is bounded by the line segment connecting the point C to the point D, the first cubic boron nitride particle (7), the second cubic boron nitride particle (8), and the bonding phase (6), divided by the length of the line segment connecting the point A to the point B is 0.14 [mu]m to 0.6 [mu]m.

Description

technical field [0001] The present invention relates to a cBN sintered body tool configured to contain a cBN sintered body containing cubic boron nitride (hereinafter also referred to as "cBN") particles and a binder phase, and the cBN sintered body is bonded by a bonding layer Bonds directly to the tool substrate. Background technique [0002] The cBN sintered body refers to a block obtained by bonding cBN particles to each other with a bonding phase mainly composed of TiN, TiC, Co, and Al. cBN particles are a material with hardness and thermal conductivity close to that of diamond, and its fracture toughness is better than that of ceramic materials. Therefore, a cBN sintered body containing a high content of cBN particles is excellent in characteristics such as plastic deformation resistance, toughness, strength, and fracture resistance. [0003] Compared with tool materials such as conventional cemented carbide tools, cBN sintered body tools using cBN sintered bodies ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/18B23B27/14C04B35/583
CPCC04B35/5831C04B35/6303C04B35/6313C04B37/026C04B2235/3217C04B2235/3847C04B2235/3852C04B2235/3886C04B2235/402C04B2235/5436C04B2235/6581C04B2235/80C04B2235/96C04B2237/122C04B2237/124C04B2237/125C04B2237/127C04B2237/361C04B2237/401C04B2237/708B22F7/08C04B35/645C04B2235/72C04B2237/52Y10T428/12139Y10T428/31678B23B27/18B23B27/20C23C14/06C23C16/30C04B35/583B32B7/12B32B15/04B32B9/005B32B15/043
Inventor 小林靖典久木野晓濑户山诚
Owner SUMITOMO ELECTRIC HARDMETAL CORP
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