Sintered object based on cubic boron nitride, and cutting tool constituted of sintered object based on cubic boron nitride

A cubic crystal boron nitride, boron nitride-based technology, applied in the manufacture of tools, workpieces, drilling accessories, etc., can solve the problems of easy chipping, short tool life, low hardness cBN sintered body, etc., to achieve excellent durability defective effect

Active Publication Date: 2017-08-01
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the unsintered portion is weaker than the portion where the cBN grains are in contact with the bonding phase, there is a problem that the hardness corresponding to the cBN content cannot be obtained as the cBN content increases.
In addition, when such a cBN sintered body with insufficient hardness is used as a tool, cracks are likely to occur starting from the portion where the cBN grains contact each other.
Therefore, if such a tool is used for interrupted cutting where the load on the cutting edge is high, there is a problem that the cutting edge is easily chipped and the tool life is short.
[0011] In addition, in the cBN sintered body shown in Patent Document 2, the influence of oxygen on the cBN particles itself can be prevented, but oxides such as Ti, which have relatively weak strength in the bonded phase structure, remain at the interface between the cBN particles and the cBN particles, so There is a problem that a cBN sintered body with low overall hardness will be obtained

Method used

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  • Sintered object based on cubic boron nitride, and cutting tool constituted of sintered object based on cubic boron nitride
  • Sintered object based on cubic boron nitride, and cutting tool constituted of sintered object based on cubic boron nitride
  • Sintered object based on cubic boron nitride, and cutting tool constituted of sintered object based on cubic boron nitride

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Experimental program
Comparison scheme
Effect test

Embodiment

[0110] Production of cBN particle powder with high surface cleanliness:

[0111] Using cBN particles having a median diameter (D50) shown in Table 1 as a substrate, the cBN particles were coated with an AlN film having an average film thickness shown in Table 1 by the ALD (Atomic Layer Deposition) method. More specifically, cBN particles having a median diameter (D50) shown in Table 1 were loaded into the furnace, the temperature in the furnace was raised to 350° C., and Al(CH 3 ) 3 gas and the use of NH as a reactive gas 3 gas,

[0112] (1)Ar+Al(CH 3 ) 3 gas inflow process,

[0113] (2) Ar gas purification process,

[0114] (3)Ar+NH 3 gas inflow process,

[0115] (4) Ar gas purification process

[0116] The above (1) to (4) are defined as one cycle, and this cycle is repeated until the AlN film reaches the target film thickness. As a result, an AlN film having a predetermined film thickness is formed on the surface of the cBN particles.

[0117] In addition, as a r...

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Abstract

A sintered object based on cubic boron nitride, the sintered object including 70-95 vol% cubic boron nitride grains. When the structure of a cross-section of the sintered object is examined, a binder phase having a width of 1-30 nm is observed between adjacent cubic boron nitride grains, the binder phase being constituted of a compound containing at least Al, B, and N, the ratio of the oxygen content to the Al content in the binder phase being 0.1 or less (in terms of atomic ratio).

Description

technical field [0001] The present invention relates to a cubic boron nitride (hereinafter, sometimes referred to as "cBN")-based sintered body (hereinafter, sometimes referred to as "cBN sintered body") having high hardness. [0002] This application claims priority based on Patent Application No. 2014-240418 filed in Japan on November 27, 2014 and Patent Application No. 2015-229737 filed in Japan on November 25, 2015, and the contents thereof are incorporated herein. Background technique [0003] The cBN sintered body has high hardness and thermal conductivity second only to diamond, and from the viewpoint of low affinity with ferrous materials, it has been suitably used for cutting ferrous workpiece materials such as steel and cast iron from the past. Tools for processing. [0004] Furthermore, in order to improve the performance as a cutting tool and to further increase the strength, toughness, hardness, etc. of a cBN sintered body, several proposals have been made conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583B23B27/14
CPCC04B35/62836C04B35/62884C04B35/62897C04B2235/3232C04B2235/3258C04B2235/3813C04B2235/3865C04B2235/5436C04B2235/5445C04B2235/661C04B2235/723C04B2235/80C04B35/5831C04B35/645C04B2235/3217C04B2235/3856C04B2235/3886C04B2235/6567C04B2235/6581C04B35/64B23B27/14B23B27/148B23B2226/125C04B2235/3843C04B2235/3847C04B2235/386C04B2235/402C04B2235/404C04B2235/604
Inventor 矢野雅大宫下庸介
Owner MITSUBISHI MATERIALS CORP
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