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Cutting tool made from cubic boron nitride sintering material

A cubic crystal boron nitride, boron nitride-based technology, applied in the field of cBN tools), can solve the problem of insufficient adhesion strength between cBN particles and the binding phase, insufficient adhesion strength between cBN particles and the binding phase, and easy defects, etc. question

Active Publication Date: 2014-08-06
MITSUBISHI MATERIALS CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0013] The cBN tool has high hardness and is excellent in that it has low affinity with iron-based workpieces such as steel and cast iron. However, since the adhesion strength between cBN particles and the binder phase is insufficient, as described in Patent Documents 1 to 5, Various proposals have been made to improve the adhesive strength
[0014] However, in the aforementioned conventional cBN tools and composite high-density-phase BN sintered tools, the adhesion strength between cBN particles and the binder phase is not stable under the cutting conditions under which a high load acts on the cutting edge such as interrupted cutting of high-hardness steel or the like. Still insufficient, therefore, prone to chipping and short tool life

Method used

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  • Cutting tool made from cubic boron nitride sintering material
  • Cutting tool made from cubic boron nitride sintering material
  • Cutting tool made from cubic boron nitride sintering material

Examples

Experimental program
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Embodiment

[0140] Fabrication of cBN particles coated with AlN(O) film:

[0141] (a) Using cBN particles with an average particle size of 0.5 to 8 μm as the base material, the surface of the particles is coated with Al in a uniform and thin film according to the ALD (Atomic Layer Deposition) method 2 o 3 film, followed by the Al 2 o 3 A uniform thin-film AlN film is formed on the film.

[0142] More specifically, for example, cBN particles having a predetermined particle size are charged in the furnace, and the temperature in the furnace is raised to 300°C. Next, Al(CH 3 ) 3 and H 2 O gas, and using Ar gas as the purge gas, perform (i) Ar+Al(CH 3 ) 3 Gas inflow process, (ii) Ar gas purge process, (iii) Ar+H 2 O gas inflow process, (iv) Ar gas purge process. The steps (i) to (iv) are regarded as one cycle, and this cycle is repeated for a desired film thickness. Film formation is performed in 0.25 to 3 hours, whereby the surface of cBN particles is uniformly coated with Al havi...

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Abstract

The invention provides a cutting tool made from a cubic boron nitride sintering material which demonstrates excellent resistance to defects in intermittent cutting machining of high-hardness steel. According to the cutting tool made from the cubic boron nitride sintering material, optimally an average particle size of a cubic boron nitride particle is 0.5 to 8 [mu]m; at least pat of the surface of the cubic boron nitride particle is coated by an oxygen-containing aluminum nitride film with the average thickness of 10 to 100 [mu]m and an everage oxygen concentration being 1 to 15 atom%; furthermore, the oxygen-containing aluminum nitride film covering the surface of the cubic boron nitride particle has a local crack; and the average formation proportion of the local crack h / H satisfies 002<=h / H<=0.08, with h representing the length of the crack of the oxygen-containing aluminum nitride film and H representing the perimeter of the cubic boron nitride particle.

Description

technical field [0001] The present invention relates to a cutting tool made of a cubic boron nitride (hereinafter referred to as cBN)-based sintered material (hereinafter referred to as cBN tool) exhibiting excellent fracture resistance in interrupted cutting of high-hardness steel. Background technique [0002] Conventionally, it is known that cBN-based sintered materials (hereinafter referred to as cBN sintered bodies) are used as cutting materials for iron-based workpieces such as steel and cast iron, due to their low affinity with the workpiece and high hardness. cBN tools for tool materials. [0003] For example, as shown in Patent Document 1, ceramic compounds such as carbides, nitrides, and borides containing 20 to 80% by volume of cBN as a hard phase and the rest of which are 4a, 5a, and 6a of the periodic table are known. cBN tool as a binding phase. [0004] Also, for example, Patent Document 2 proposes the following scheme: surround cBN particles with at least o...

Claims

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Application Information

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IPC IPC(8): C04B35/5831C04B35/628
Inventor 矢野雅大宮下庸介大桥忠一
Owner MITSUBISHI MATERIALS CORP
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