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 e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

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

[0032] Table 1 shows the cBN sintered bodies produced by changing the type of cBN powder and the ratio of the cBN powder to the 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, after the sintered body was melted by the molten salt method, each element was quantitatively measured by high-frequency induction plasma light emission ...

Example Embodiment

[0049] Example 2

[0050] Using the sintered body material produced in Example 1, thermal cracking and thermal conductivity were evaluated. Thermal conductivity is obtained using the laser flash method or AC calorimetry. In addition, the cBN sintered body was added to obtain a cutting insert of 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] Material to be cut: gray cast iron FC250 milling

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

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

[0054] The obtained results are shown in Table 2.

[0055] From 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 evaluation of the number of thermal cracks could not be perf...

Example Embodiment

[0060] Example 3

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

[0062] Material to be cut: gray cast iron FC300 round bar with 6 V-grooves outside diameter turning

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

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

[0065] The obtained results are shown in Table 2.

[0066] According to the comparison of samples 1 to 6, it was found that sample 1 with a cBN content of less than 70 vol% had defects at the early stage of cutting, and reached 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 Sample 1, which is outside the scope of the present invention, has a small cBN content, so th...

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PUM

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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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