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Cubic boron nitride sintered compact

A technology of cubic crystal and sintered body, which is applied in the field of cubic boron nitride sintered body, which can solve problems such as defective cBN particles, wear, and difficulty in reaction, and achieves suppression of defect or wear, high thermal conductivity, and excellent damage resistance. Effect

Active Publication Date: 2007-01-31
SUMITOMO ELECTRIC HARDMETAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with conventional catalysts, since cBN particles are stable under high temperature and pressure, it is difficult to react, and there are often defects in the reaction part between cBN particles, or only contact, and unreacted parts remain
Therefore, when the cBN sintered body is used as a cutting tool, it is easy to cause chipping or wear due to the falling off of the cBN particles starting from the reaction defect part or the unreacted part between the cBN particles.
[0011] As a result, a satisfactory tool life cannot be obtained with a cBN sintered body having a skeleton structure between cBN particles having a high cBN content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] cBN powder and binder powder having an average particle diameter of 2 μm were prepared. This binder powder was produced by mixing 50% by weight of Co, 40% by weight of Al, and 10% by weight of WC. The bonding material powder and the cBN powder with an average particle diameter of 2 μm were mixed using a cemented carbide pot and balls. This powder was filled in a cemented carbide container, and sintered at a pressure of 6.0 GPa and a temperature of 1400° C. for 30 minutes.

[0032] Table 1 shows cBN sintered bodies produced by changing the type of cBN powder and the ratio of cBN powder to binder powder. The content of cBN and the amount of catalyst elements were measured by the following methods. First, in order to measure the amount of elements contained in the cBN sintered body, the sintered body was melted by the molten salt method, and then each element was quantitatively measured by high-frequency induction plasma emission analysis (ICP method). From the results,...

Embodiment 2

[0050] Using the sintered body material produced in Example 1, thermal cracking and thermal conductivity were evaluated. Thermal conductivity was obtained using the laser flash method or AC calorimetry. In addition, a cBN sintered body was added to obtain a cutting insert in the shape of ISO standard SNGA090312. Using these cutting inserts, cutting evaluation was performed under the following conditions, and the number of thermal cracks was evaluated.

[0051] Cutting material: gray cast iron FC250 milling

[0052] Cutting conditions: cutting speed V=2500m / min, cutting depth Rd=30mm, Ad=0.3mm

[0053] Feed rate f=0.2mm / knife, dry type, cutting time 30 minutes

[0054] Table 2 shows the obtained results.

[0055] According to the comparison of samples 1 to 6, it was found that sample 1 with a cBN content of less than 70% by volume had defects that were considered to be caused by thermal cracks, and the number of thermal cracks could not be evaluated, while samples 2 to 6 pr...

Embodiment 3

[0061] Using the sintered body material produced in Example 1, chipping resistance was evaluated. First, cutting inserts in the shape of ISO standard SNGA120408 were produced. Using these cutting inserts, cutting evaluation was performed under the following conditions, and the time to chipping was evaluated.

[0062] Cutting material: gray cast iron FC300 round bar outer diameter turning with 6 V-shaped grooves

[0063] Cutting conditions: cutting speed V=700m / min, cutting depth d=0.5mm

[0064] Feed f=0.2mm / rev., dry type

[0065] Table 2 shows the obtained results.

[0066] According to the comparison of samples 1 to 6, it was found that sample 1 with a cBN content of less than 70% by volume produced defects at the initial stage of cutting, reaching 1 / 6 to 1 / 8 of the defect life of samples 2 to 5 produced based on the scope of the present invention. This is because the cBN content of sample 1 outside the scope of the present invention was small, and a skeleton structure ...

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Abstract

The present invention provides a cubic boron nitride sintered body, which achieves both of superior chipping resistance and wear resistance. In accordance with a first aspect of the present invention, a cubic boron nitride (cBN) sintered body contains cubic boron nitride particles and a bonding material used for bonding the cBN particles to one another. This sintered body is constituted by cBN particles in a range from 70 vol% to 98 vol% and a residual bonding material made from a Co compound, an Al compound and WC and a solid solution of these. Moreover, the cBN particles in the sintered body contain 0.03 wt% or less of Mg and 0.001 wt% or more to 0.05 wt% or less of Li. In accordance with a second aspect of the present invention, the cubic boron nitride sintered body has a composition in which the bonding material of the first aspect is changed to an Al compound.

Description

technical field [0001] The present invention relates to a sintered body (hereinafter referred to as cBN sintered body) containing cubic boron nitride (cBN). In particular, it relates to a cubic boron nitride sintered body which is excellent in chip resistance and wear resistance and is most suitable for cutting tool materials. Background technique [0002] cBN (cubicboron nitride) has hardness and thermal conductivity second only to diamond, and is characterized by lower reactivity with ferrous metals than diamond. The cBN sintered body containing the cBN particles has the advantage of improving the processing efficiency, and has replaced the conventional tools such as cemented carbide or cermet in the cutting of ferrous difficult-to-cut materials. [0003] Conventionally, for example, as shown in Patent Document 1, there is known a cBN sintered body in which cBN particles are sintered via a Ti ceramics-based binder. This sintered body is a sintered body having a relativel...

Claims

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Application Information

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IPC IPC(8): C22C29/16C22C26/00
CPCC04B2235/3418C04B2235/402C04B2235/3847C04B2235/401C04B2235/3821C04B2235/407C04B2235/40C22C26/00B22F2005/001C04B2235/3286C04B2235/3817C04B2235/72C04B2235/3227C04B2235/404C04B2235/9607C04B2235/96C04B35/645C04B2235/5436C04B35/5831C04B2235/405C22C29/00C22C29/16
Inventor 松川伦子久木野晓深谷朋弘
Owner SUMITOMO ELECTRIC HARDMETAL CORP
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